{"id":1421,"date":"2026-08-03T17:29:33","date_gmt":"2026-08-03T15:29:33","guid":{"rendered":"https:\/\/www-new.ias.u-psud.fr\/?p=1421"},"modified":"2026-09-14T18:25:37","modified_gmt":"2026-09-14T16:25:37","slug":"ariel","status":"publish","type":"post","link":"https:\/\/www.ias.u-psud.fr\/index.php\/2026\/08\/03\/ariel\/","title":{"rendered":"Ariel"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1421\" class=\"elementor elementor-1421\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-365d0f3 e-flex e-con-boxed e-con e-parent\" data-id=\"365d0f3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-84ab3f5 elementor-widget elementor-widget-theme-post-featured-image elementor-widget-image\" data-id=\"84ab3f5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"theme-post-featured-image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"550\" height=\"320\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/06\/banniere-550x320-04.jpg\" class=\"attachment-large size-large wp-image-752\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/06\/banniere-550x320-04.jpg 550w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/06\/banniere-550x320-04-300x175.jpg 300w\" sizes=\"(max-width: 550px) 100vw, 550px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f4f600f e-flex e-con-boxed e-con e-parent\" data-id=\"f4f600f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-63f7b05 elementor-widget elementor-widget-theme-post-title elementor-page-title elementor-widget-heading\" data-id=\"63f7b05\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"theme-post-title.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Ariel<\/h1>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9b7c05e e-con e-atomic-element e-flexbox-base e-9b7c05e-607ee4c \" data-id=\"9b7c05e\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"9b7c05e\">\n    \t\t<div class=\"elementor-element elementor-element-d72e17c elementor-widget elementor-widget-text-editor\" data-id=\"d72e17c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Ariel est un t\u00e9lescope spatial qui sondera de mani\u00e8re syst\u00e9matique les atmosph\u00e8res d&rsquo;un millier de plan\u00e8tes extrasolaires, des g\u00e9antes gazeuses aux plan\u00e8tes rocheuses, qu&rsquo;elles soient chaudes ou temp\u00e9r\u00e9es autour d&rsquo;\u00e9toiles de diff\u00e9rents types. ARIEL mesurera la composition et la structure des atmosph\u00e8res plan\u00e9taires, contraindra la nature des coeurs plan\u00e9taires, d\u00e9tectera la pr\u00e9sence de nuages et \u00e9tudiera les interactions avec l&rsquo;\u00e9toile h\u00f4te.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4cc861a e-flex e-con-boxed e-con e-parent\" data-id=\"4cc861a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f28d1d7 elementor-widget elementor-widget-heading\" data-id=\"f28d1d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Le r\u00f4le de l'IAS<\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dc358a3 e-con e-atomic-element e-flexbox-base e-dc358a3-60963d2 \" data-id=\"dc358a3\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"dc358a3\">\n    \t\t<div class=\"elementor-element elementor-element-2869bb4 elementor-widget elementor-widget-text-editor\" data-id=\"2869bb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"kY2IgmnCmOGjharHErah N56cWZpP8cNJu1dqgCxB\">\u00c0 <\/span>compter de 2015, puisant dans l&rsquo;expertise accumul\u00e9e, des \u00e9quipes de cinq laboratoires fran\u00e7ais (IAP, DAp\/AIM, IAS, LESIA, LAB) ont pris une part tr\u00e8s importante dans les \u00e9tudes d&rsquo;Ariel. Les interventions dans l&rsquo;\u00e9laboration de la proposition scientifique, du sc\u00e9nario de mission et les \u00e9tudes de faisabilit\u00e9 du spectrom\u00e8tre infrarouge, au c\u0153ur du satellite, ont \u00e9t\u00e9 d\u00e9terminantes. Cela a conduit les \u00e9quipes fran\u00e7aises \u00e0 prendre la responsabilit\u00e9 de la conception et de la fourniture du spectrom\u00e8tre infrarouge.\u00a0 Ce dernier sera construit, sous la supervision du CNES, par le CEA-Irfu avec des contributions importantes de l&rsquo;IAS et du LESIA.<\/p><p>\u00ab <em>Ariel est la suite logique des programmes d&rsquo;observations d&rsquo;exoplan\u00e8tes que nous allons conduire avec le JWST. L&rsquo;approche statistique d\u2019Ariel est cruciale ; c&rsquo;est tr\u00e8s r\u00e9jouissant que l&rsquo;Europe puisse \u00eatre l&rsquo;acteur pr\u00e9pond\u00e9rant de cette nouvelle page qui s&rsquo;ouvre dans l&rsquo;histoire de l&rsquo;\u00e9tude des exoplan\u00e8tes<\/em> \u00bb conclut Pierre-Olivier Lagage.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7e1be3a e-con e-atomic-element e-flexbox-base e-e9a08ce \" data-id=\"7e1be3a\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"7e1be3a\">\n    <div class=\"elementor-element elementor-element-eb49c94 e-con e-atomic-element e-flexbox-base e-eb49c94-65016b5 \" data-id=\"eb49c94\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"eb49c94\">\n    <div class=\"elementor-element elementor-element-2ce46c1 e-flex e-con-boxed e-con e-parent\" data-id=\"2ce46c1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-f2a8b5d e-con e-atomic-element e-flexbox-base e-f2a8b5d-93cfc87 \" data-id=\"f2a8b5d\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"f2a8b5d\">\n    \t\t<div class=\"elementor-element elementor-element-96646fa elementor-widget elementor-widget-button\" data-id=\"96646fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#en-savoir-plus\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">En savoir plus<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n<div class=\"elementor-element elementor-element-052ec2c e-con e-atomic-element e-flexbox-base e-4ee921f \" data-id=\"052ec2c\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"052ec2c\">\n    \t\t<div class=\"elementor-element elementor-element-1f01142 elementor-blockquote--align-right elementor-blockquote--skin-border elementor-widget elementor-widget-blockquote\" data-id=\"1f01142\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"blockquote.default\">\n\t\t\t\t\t\t\t<blockquote class=\"elementor-blockquote\">\n\t\t\t<p class=\"elementor-blockquote__content\">\n\t\t\t\t\u00ab ARIEL est la cl\u00e9 pour d\u00e9chiffrer les propri\u00e9t\u00e9s des atmosph\u00e8res des autres mondes ! \u00bb\t\t\t<\/p>\n\t\t\t\t\t\t\t<div class=\"e-q-footer\">\n\t\t\t\t\t\t\t\t\t\t\t<cite class=\"elementor-blockquote__author\">Jean-Philippe Beaulieu<\/cite>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/blockquote>\n\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-a181800 e-con e-atomic-element e-flexbox-base e-a181800-926350d \" data-id=\"a181800\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"a181800\">\n    \t\t<div class=\"elementor-element elementor-element-bc4a91b elementor-widget elementor-widget-n-accordion\" data-id=\"bc4a91b\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;all_collapsed&quot;,&quot;max_items_expended&quot;:&quot;multiple&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1970\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1970\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Statut <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-up\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M8 256C8 119 119 8 256 8s248 111 248 248-111 248-248 248S8 393 8 256zm292 116V256h70.9c10.7 0 16.1-13 8.5-20.5L264.5 121.2c-4.7-4.7-12.2-4.7-16.9 0l-115 114.3c-7.6 7.6-2.2 20.5 8.5 20.5H212v116c0 6.6 5.4 12 12 12h64c6.6 0 12-5.4 12-12z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-down\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256c0 137-111 248-248 248S8 393 8 256 119 8 256 8s248 111 248 248zM212 140v116h-70.9c-10.7 0-16.1 13-8.5 20.5l114.9 114.3c4.7 4.7 12.2 4.7 16.9 0l114.9-114.3c7.6-7.6 2.2-20.5-8.5-20.5H300V140c0-6.6-5.4-12-12-12h-64c-6.6 0-12 5.4-12 12z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1970\" class=\"elementor-element elementor-element-ffd0654 e-con-full e-flex e-con e-child\" data-id=\"ffd0654\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1e246f0 elementor-widget elementor-widget-text-editor\" data-id=\"1e246f0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>En d\u00e9veloppement<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1971\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1971\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Partenaires (acad\u00e9miques \/ industriels) <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-up\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M8 256C8 119 119 8 256 8s248 111 248 248-111 248-248 248S8 393 8 256zm292 116V256h70.9c10.7 0 16.1-13 8.5-20.5L264.5 121.2c-4.7-4.7-12.2-4.7-16.9 0l-115 114.3c-7.6 7.6-2.2 20.5 8.5 20.5H212v116c0 6.6 5.4 12 12 12h64c6.6 0 12-5.4 12-12z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-down\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256c0 137-111 248-248 248S8 393 8 256 119 8 256 8s248 111 248 248zM212 140v116h-70.9c-10.7 0-16.1 13-8.5 20.5l114.9 114.3c4.7 4.7 12.2 4.7 16.9 0l114.9-114.3c7.6-7.6 2.2-20.5-8.5-20.5H300V140c0-6.6-5.4-12-12-12h-64c-6.6 0-12 5.4-12 12z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1971\" class=\"elementor-element elementor-element-9ddd6cc e-con-full e-flex e-con e-child\" data-id=\"9ddd6cc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1972\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1972\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Financeurs <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-up\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M8 256C8 119 119 8 256 8s248 111 248 248-111 248-248 248S8 393 8 256zm292 116V256h70.9c10.7 0 16.1-13 8.5-20.5L264.5 121.2c-4.7-4.7-12.2-4.7-16.9 0l-115 114.3c-7.6 7.6-2.2 20.5 8.5 20.5H212v116c0 6.6 5.4 12 12 12h64c6.6 0 12-5.4 12-12z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-down\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256c0 137-111 248-248 248S8 393 8 256 119 8 256 8s248 111 248 248zM212 140v116h-70.9c-10.7 0-16.1 13-8.5 20.5l114.9 114.3c4.7 4.7 12.2 4.7 16.9 0l114.9-114.3c7.6-7.6 2.2-20.5-8.5-20.5H300V140c0-6.6-5.4-12-12-12h-64c-6.6 0-12 5.4-12 12z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1972\" class=\"elementor-element elementor-element-977f54e e-con-full e-flex e-con e-child\" data-id=\"977f54e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-df0e35d elementor-widget elementor-widget-image\" data-id=\"df0e35d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.esa.int\/\" target=\"_blank\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"482\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/ESA_Logo_pillars-1892940653-768x482.jpg\" class=\"attachment-medium_large size-medium_large wp-image-1244\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/ESA_Logo_pillars-1892940653-768x482.jpg 768w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/ESA_Logo_pillars-1892940653-300x188.jpg 300w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/ESA_Logo_pillars-1892940653-1024x643.jpg 1024w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/ESA_Logo_pillars-1892940653-1536x964.jpg 1536w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/ESA_Logo_pillars-1892940653.jpg 1920w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1973\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1973\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Dates cl\u00e9s (pr\u00e9v.) <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-up\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M8 256C8 119 119 8 256 8s248 111 248 248-111 248-248 248S8 393 8 256zm292 116V256h70.9c10.7 0 16.1-13 8.5-20.5L264.5 121.2c-4.7-4.7-12.2-4.7-16.9 0l-115 114.3c-7.6 7.6-2.2 20.5 8.5 20.5H212v116c0 6.6 5.4 12 12 12h64c6.6 0 12-5.4 12-12z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-down\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256c0 137-111 248-248 248S8 393 8 256 119 8 256 8s248 111 248 248zM212 140v116h-70.9c-10.7 0-16.1 13-8.5 20.5l114.9 114.3c4.7 4.7 12.2 4.7 16.9 0l114.9-114.3c7.6-7.6 2.2-20.5-8.5-20.5H300V140c0-6.6-5.4-12-12-12h-64c-6.6 0-12 5.4-12 12z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1973\" class=\"elementor-element elementor-element-ae94f78 e-flex e-con-boxed e-con e-child\" data-id=\"ae94f78\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1974\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"5\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1974\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> \u00c9tapes cl\u00e9s <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-up\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M8 256C8 119 119 8 256 8s248 111 248 248-111 248-248 248S8 393 8 256zm292 116V256h70.9c10.7 0 16.1-13 8.5-20.5L264.5 121.2c-4.7-4.7-12.2-4.7-16.9 0l-115 114.3c-7.6 7.6-2.2 20.5 8.5 20.5H212v116c0 6.6 5.4 12 12 12h64c6.6 0 12-5.4 12-12z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-arrow-alt-circle-down\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256c0 137-111 248-248 248S8 393 8 256 119 8 256 8s248 111 248 248zM212 140v116h-70.9c-10.7 0-16.1 13-8.5 20.5l114.9 114.3c4.7 4.7 12.2 4.7 16.9 0l114.9-114.3c7.6-7.6 2.2-20.5-8.5-20.5H300V140c0-6.6-5.4-12-12-12h-64c-6.6 0-12 5.4-12 12z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1974\" class=\"elementor-element elementor-element-4f265e0 e-flex e-con-boxed e-con e-child\" data-id=\"4f265e0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c404145 elementor-widget elementor-widget-text-editor\" data-id=\"c404145\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Lancement : mai 2028<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-72b19574 e-con-full e-flex e-con e-parent\" data-id=\"72b19574\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-53a7b892 e-con-full e-flex e-con e-child\" data-id=\"53a7b892\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-13a0d604 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"13a0d604\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Contacts<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3108905 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"3108905\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeIn&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">R\u00e9f\u00e9rents (scientifiques et techniques) <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1c63b2a5 elementor-widget elementor-widget-text-editor\" data-id=\"1c63b2a5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><a href=\"http:\/\/www.ias.u-psud.fr\/annuaire?nom=ollivier\">Marc Ollivier<\/a>, <span class=\"kY2IgmnCmOGjharHErah N56cWZpP8cNJu1dqgCxB\">\u00c9<\/span>quipe Physique du syst\u00e8me solaire et des syst\u00e8mes plan\u00e9taires \u00e0 l&rsquo;IAS &lsquo;CNRS \/ Universit\u00e9 Paris-Saclay)<\/li><li>Jean-Philippe Beaulieu, Institut d\u2019Astrophysique de Paris<\/li><li>Pierre-Olivier Lagage, D\u00e9partement d&rsquo;Astrophysique au CEA-Irfu, UMR AIM Paris-Saclay<\/li><li>Pierre\u00a0 Drossart, LESIA, Observatoire de Paris, CNRS, PSL, Sorbonne Universit\u00e9, Universit\u00e9 Paris-Diderot<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-70487e6 e-con-full e-flex e-con e-child\" data-id=\"70487e6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d3c470d elementor-widget elementor-widget-image\" data-id=\"d3c470d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"160\" height=\"110\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/ARIEL.png\" class=\"attachment-large size-large wp-image-1434\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5612ae1 e-flex e-con-boxed e-con e-parent\" data-id=\"5612ae1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1e69ba7 elementor-widget elementor-widget-menu-anchor\" data-id=\"1e69ba7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"en-savoir-plus\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4211889 elementor-widget elementor-widget-heading\" data-id=\"4211889\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">La s\u00e9lection de la mission spatiale<\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8d2c731 e-con e-atomic-element e-flexbox-base e-8d2c731-bc6f834 \" data-id=\"8d2c731\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"8d2c731\">\n    \t\t<div class=\"elementor-element elementor-element-10d0162 elementor-widget elementor-widget-text-editor\" data-id=\"10d0162\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Le comit\u00e9 des programmes de l&rsquo;Agence Spatiale Europ\u00e9enne a s\u00e9lectionn\u00e9 la mission Ariel comme la 4\u00e8me mission de classe interm\u00e9diaire (budget 450 millions d&rsquo;euros) du programme \u00ab Cosmic Vision \u00bb.<\/p><p>Ariel sera lanc\u00e9 de la base de Kourou en Guyane en mai 2028 et sera plac\u00e9 en orbite au point de Lagrange L2, situ\u00e9 \u00e0 1.5 million de kilom\u00e8tre de la Terre. Ariel est un t\u00e9lescope spatial qui sondera de mani\u00e8re syst\u00e9matique les atmosph\u00e8res d&rsquo;un millier de plan\u00e8tes extrasolaires, des g\u00e9antes gazeuses aux plan\u00e8tes rocheuses, qu&rsquo;elles soient chaudes ou temp\u00e9r\u00e9es autour d&rsquo;\u00e9toiles de diff\u00e9rents types.<\/p><p>Ariel mesurera la composition et la structure des atmosph\u00e8res plan\u00e9taires, contraindra la nature des c\u0153urs plan\u00e9taires, d\u00e9tectera la pr\u00e9sence de nuages et \u00e9tudiera les interactions avec l&rsquo;\u00e9toile h\u00f4te.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5bbe0a6 e-flex e-con-boxed e-con e-parent\" data-id=\"5bbe0a6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-729adb5 e-con e-atomic-element e-flexbox-base e-729adb5-2758d92 \" data-id=\"729adb5\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"729adb5\">\n    \t\t<div class=\"elementor-element elementor-element-c3247d4 elementor-widget elementor-widget-text-editor\" data-id=\"c3247d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Le processus de s\u00e9lection s&rsquo;est d\u00e9roul\u00e9 en plusieurs \u00e9tapes\u00a0:<\/p><p>Appel \u00e0 proposition de missions lanc\u00e9 par l&rsquo;ESA en ao\u00fbt 2014\u00a0;<\/p><p>Pr\u00e9-s\u00e9lection en juin 2015 de 3 missions sur les 27 propos\u00e9es pour des \u00e9tudes de concepts d\u00e9taill\u00e9s\u00a0;<\/p><p>\u00c9valuation du r\u00e9sultat des \u00e9tudes par un comit\u00e9 d\u2019experts et recommandation d&rsquo;une mission\u00a0en novembre 2017\u00a0;<\/p><p>Vote formel du Comit\u00e9 des Programmes de l\u2019ESA et <a href=\"https:\/\/www.esa.int\/Science_Exploration\/Space_Science\/ESA_s_next_science_mission_to_focus_on_nature_of_exoplanets\">annonce publique<\/a> le 20 mars 2018.<\/p><p>Pierre Drossart rappelle\u00a0: \u00ab\u00a0<em>L&rsquo;\u00e9tude de la mission ARIEL a \u00e9t\u00e9 men\u00e9e sur les bases du projet EChO candidat pour la Mission\u00a0 M3 de l&rsquo;ESA en 2014. L&rsquo;\u00e9volution de la\u00a0 recherche sur les exoplan\u00e8tes place aujourd&rsquo;hui clairement <strong>la spectroscopie<\/strong> comme un enjeu majeur de la prochaine d\u00e9cennie dans l&rsquo;\u00e9tude de leurs atmosph\u00e8res. <\/em>\u00bb<\/p><p>La mission Ariel a \u00e9t\u00e9 propos\u00e9e par un consortium de plus de 60 instituts dans 15 pays europ\u00e9ens(*). La coordination scientifique et technique est assur\u00e9e par le Royaume-Uni. Une contribution des \u00c9tats-Unis est actuellement \u00e0 l&rsquo;\u00e9tude.<\/p><p>Ariel sera compos\u00e9 d&rsquo;un t\u00e9lescope d&rsquo;environ un m\u00e8tre de diam\u00e8tre pour collecter la lumi\u00e8re visible et infrarouge d&rsquo;\u00e9toiles autour desquelles orbite une exoplan\u00e8te. Un spectrom\u00e8tre \u00e9talera cette lumi\u00e8re en \u00ab arc en ciel \u00bb et, lorsque l&rsquo;exoplan\u00e8te transitera devant son \u00e9toile, le spectre obtenu pr\u00e9sentera des bandes d&rsquo;absorption de la lumi\u00e8re de l&rsquo;\u00e9toile par les mol\u00e9cules dans l&rsquo;atmosph\u00e8re de l&rsquo;exoplan\u00e8te.<\/p><p>Marc Ollivier insiste\u00a0: \u00ab\u00a0L<em>&lsquo;observation est particuli\u00e8rement d\u00e9licate, car l&rsquo;information sur la plan\u00e8te doit \u00eatre dissoci\u00e9e de la lumi\u00e8re de l&rsquo;\u00e9toile elle-m\u00eame, 1000 \u00e0 100000 fois plus brillante que la plan\u00e8te. La performance ultime est obtenue gr\u00e2ce \u00e0 la stabilit\u00e9 photom\u00e9trique intrins\u00e8que de l&rsquo;instrument et une connaissance tr\u00e8s rigoureuse de son fonctionnement. <\/em>\u00bb<\/p><p>Ariel prend sa source dans des travaux des 10 derni\u00e8res ann\u00e9es. En 2007, de la vapeur d&rsquo;eau, puis du dioxyde de carbone et du monoxyde de carbone sont d\u00e9tect\u00e9s dans l&rsquo;atmosph\u00e8re du Jupiter chaud HD189733b gr\u00e2ce aux satellites Spitzer et Hubble. Les premiers r\u00e9sultats ont soulign\u00e9 la difficult\u00e9 de la mesure et l&rsquo;immense diversit\u00e9 des atmosph\u00e8res d&rsquo;exoplan\u00e8tes. Pour obtenir des mesures aussi difficiles sur un grand nombre de plan\u00e8tes, il est n\u00e9cessaire de disposer d&rsquo;instrument d\u00e9di\u00e9s et optimis\u00e9s. Un groupe de scientifiques a donc d\u00e9marr\u00e9 des \u00e9tudes d\u00e8s 2008.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dfe76fc e-con e-atomic-element e-flexbox-base e-33acbab \" data-id=\"dfe76fc\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"dfe76fc\">\n    <div class=\"elementor-element elementor-element-d80a514 e-con e-atomic-element e-flexbox-base e-d816c7e \" data-id=\"d80a514\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"d80a514\">\n    \t\t\t<img loading=\"lazy\" decoding=\"async\" class=\"e-image-base \" data-interaction-id=\"9ccbb10\" id=\"1432\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image1_ariel_news.jpg\" width=\"1200\" height=\"675\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image1_ariel_news.jpg 1200w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image1_ariel_news-300x169.jpg 300w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image1_ariel_news-1024x576.jpg 1024w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image1_ariel_news-768x432.jpg 768w\" alt=\"\"\/>\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-c6a31c2 e-con e-atomic-element e-flexbox-base e-ebb05f0 \" data-id=\"c6a31c2\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"c6a31c2\">\n    \t\t\t<img loading=\"lazy\" decoding=\"async\" class=\"e-image-base \" data-interaction-id=\"584aae1\" id=\"1433\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image2_ariel_news.jpg\" width=\"1200\" height=\"739\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image2_ariel_news.jpg 1200w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image2_ariel_news-300x185.jpg 300w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image2_ariel_news-1024x631.jpg 1024w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/08\/image2_ariel_news-768x473.jpg 768w\" alt=\"\"\/>\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-3a4bd91 e-con e-atomic-element e-flexbox-base e-b916c8d \" data-id=\"3a4bd91\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"3a4bd91\">\n    \t\t\t<p class=\"e-0af07df-a4fd9f1 e-paragraph-base\" data-interaction-id=\"0af07df\">Image d'artiste du satellite Ariel en route vers sa destination finale&nbsp;: en orbite autour du point de Lagrange L2. &nbsp;<br><br>ESA\/STFC RAL Space\/UCL\/Europlanet-Science Office&nbsp;<\/p>\n\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-f33e167 e-con e-atomic-element e-flexbox-base e-ab8967a \" data-id=\"f33e167\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"f33e167\">\n    \t\t\t<p class=\"e-0322890-d28ff8f e-paragraph-base\" data-interaction-id=\"0322890\">Ariel sera mis en orbite autour du point de Lagrange L2 \u00e0 1.5 million de kilom\u00e8tres de la Terre. Il tournera autour du Soleil de fa\u00e7on synchrone avec la Terre.&nbsp; &nbsp;<br><br>ESA\/STFC RAL Space\/UCL\/Europlanet-Science Office<\/p>\n\t\t\n<\/div>\n\n<\/div>\n\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>ARIEL est un t\u00e9lescope spatial qui sondera de mani\u00e8re syst\u00e9matique les atmosph\u00e8res d\u2019un millier de plan\u00e8tes extrasolaires, des g\u00e9antes gazeuses aux plan\u00e8tes rocheuses, qu\u2019elles soient chaudes ou temp\u00e9r\u00e9es autour d\u2019\u00e9toiles de diff\u00e9rents types.<\/p>\n","protected":false},"author":3,"featured_media":752,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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