{"id":2880,"date":"2026-09-14T11:15:56","date_gmt":"2026-09-14T09:15:56","guid":{"rendered":"https:\/\/www-new.ias.u-psud.fr\/?p=2880"},"modified":"2026-09-14T11:49:57","modified_gmt":"2026-09-14T09:49:57","slug":"bisou","status":"publish","type":"post","link":"https:\/\/www.ias.u-psud.fr\/index.php\/2026\/09\/14\/bisou\/","title":{"rendered":"BISOU"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2880\" class=\"elementor elementor-2880\" 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 decoding=\"async\" width=\"160\" height=\"110\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/09\/logo_bisou_21mars2023.png\" class=\"attachment-medium_large size-medium_large wp-image-2904\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7ce05c8 elementor-widget elementor-widget-text-editor\" data-id=\"7ce05c8\" 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>NASA\/JPL-Caltech\/MSSS<\/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<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\">BISOU<\/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><em>BISOU (Balloon Interferometer for Spectral Observations of the primordial Universe) est un projet pr\u00e9curseur dont le but est d\u2019effectuer la d\u00e9tection des distorsions spectrales du fond diffus cosmologique (CMB \u2013 Cosmic Microwave Background) \u00e0 partir d&rsquo;un spectrom\u00e8tre embarqu\u00e9 en ballon stratosph\u00e9rique.<\/em><\/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-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-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\">Le r\u00f4le de l'IAS<\/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>BISOU, coordonn\u00e9 par l\u2019\u00e9quipe Cosmologie de l\u2019IAS, est une collaboration internationale regroupant plusieurs laboratoires en France, Italie, Irlande, Royaume Uni, Etats Unis d\u2019Am\u00e9rique et Japon. Outre jouer le r\u00f4le de pathfinder d\u2019une potentielle future mission spatiale, de d\u00e9velopper certaines technologies clefs et de consolider le concept de mesure en utilisant un spectrom\u00e8tre \u00e0 transform\u00e9e de Fourier (FTS), BISOU a pour objectifs scientifiques d\u2019effectuer une premi\u00e8re d\u00e9tection des distorsions spectrales de <em>type y,<\/em> ainsi que d&rsquo;obtenir une meilleure pr\u00e9cision sur la mesure de la temp\u00e9rature du CMB et de l\u2019intensit\u00e9 totale du fond diffus infrarouge (CIB \u2013 Cosmic Infrared Background).<\/p><p>Une \u00e9tude de Phase 0 du CNES s&rsquo;ext termin\u00e9e avec succ\u00e8s au printemps 2023, et une Phase A devrait commencer en mars 2024.<\/p><p>Par ailleurs, un co-financement de la r\u00e9gion Ile de France (DIM-ORIGINES) et du CNES a \u00e9t\u00e9 r\u00e9cemment attribu\u00e9 pour le <a href=\"https:\/\/www.dim-origines.fr\/spip.php?article404\" target=\"_blank\" rel=\"noopener\">d\u00e9veloppement d&rsquo;un prototype de cet instrument, BISOU-BBM<\/a>.<\/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-8d12c66 e-flex e-con-boxed e-con e-parent\" data-id=\"8d12c66\" 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-18b7f30 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"18b7f30\" 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\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<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 class=\"elementor-element elementor-element-2b77e38 elementor-widget elementor-widget-image\" data-id=\"2b77e38\" 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:\/\/global.jaxa.jp\/\" target=\"_blank\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"648\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu-768x648.png\" class=\"attachment-medium_large size-medium_large wp-image-583\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu-768x648.png 768w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu-300x253.png 300w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu.png 926w\" 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-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-b878257 elementor-widget elementor-widget-image\" data-id=\"b878257\" 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:\/\/global.jaxa.jp\/\" target=\"_blank\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"648\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu-768x648.png\" class=\"attachment-medium_large size-medium_large wp-image-583\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu-768x648.png 768w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu-300x253.png 300w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/07\/Logo_CNES_2017_triangulaire_bleu.png 926w\" 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 class=\"elementor-element elementor-element-ce0cbf8 elementor-widget elementor-widget-image\" data-id=\"ce0cbf8\" 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=\"200\" height=\"200\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/09\/dim_origines_logo-2907355843.jpg\" class=\"attachment-medium_large size-medium_large wp-image-2896\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/09\/dim_origines_logo-2907355843.jpg 200w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2026\/09\/dim_origines_logo-2907355843-150x150.jpg 150w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/>\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<div class=\"elementor-element elementor-element-c315855 elementor-widget elementor-widget-text-editor\" data-id=\"c315855\" 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><strong>Printemps 2023<\/strong> : Fin r\u00e9ussie de la <strong>Phase 0<\/strong> (\u00e9tude de faisabilit\u00e9) avec le CNES.<\/li><li><strong>Mars 2024<\/strong> : D\u00e9but de la <strong>Phase A<\/strong> (conception d\u00e9taill\u00e9e).<\/li><li><strong>2021\u20132022<\/strong> : Pr\u00e9sentations lors de conf\u00e9rences internationales (ESA, SPIE, Marcel Grossmann).<\/li><\/ul>\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\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-ac0a172 elementor-widget elementor-widget-text-editor\" data-id=\"ac0a172\" 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><strong>\u00c9tude de faisabilit\u00e9<\/strong> : Valid\u00e9e en 2023 avec le CNES.<\/li><li><strong>D\u00e9veloppement du prototype<\/strong> : <strong>BISOU-BBM<\/strong>, cofinanc\u00e9 par le <strong>CNES<\/strong> et la <strong>R\u00e9gion \u00cele-de-France (DIM-ORIGINES)<\/strong>.<\/li><li><strong>Conception d\u00e9taill\u00e9e<\/strong> : Lancement en mars 2024 (Phase A).<\/li><li><strong>Pr\u00e9sentations scientifiques<\/strong> : Conf\u00e9rences internationales pour promouvoir le projet.<\/li><\/ul>\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\t<details id=\"e-n-accordion-item-1975\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"6\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1975\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> Instruments spatiaux <\/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-1975\" class=\"elementor-element elementor-element-645a86c e-flex e-con-boxed e-con e-child\" data-id=\"645a86c\" 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-21fe700 elementor-widget elementor-widget-text-editor\" data-id=\"21fe700\" 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><strong>Spectrom\u00e8tre FTS<\/strong> : Mesure les distorsions spectrales du CMB.<br \/><strong>BISOU-BBM<\/strong> : Prototype pour valider les technologies avant le vol.<\/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=\"https:\/\/www.ias.u-psud.fr\/annuaire?nom=maffei\">Bruno Maffei<\/a>, Professeur, Cosmologie<\/li><li><a href=\"https:\/\/www.ias.u-psud.fr\/pperso\/naghanim\/\">Nabila Aghanim<\/a>, Directrice de recherche, \u00c9quipe Cosmologie<\/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-48cc0a2 e-con-full e-flex e-con e-child\" data-id=\"48cc0a2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-43f4420 e-flex e-con-boxed e-con e-parent\" data-id=\"43f4420\" 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-07bcf12 elementor-widget elementor-widget-menu-anchor\" data-id=\"07bcf12\" 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<div class=\"elementor-element elementor-element-c2c51c4 e-con e-atomic-element e-flexbox-base e-c2c51c4-7fc63ec \" data-id=\"c2c51c4\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"c2c51c4\">\n    \t\t<div class=\"elementor-element elementor-element-a3fff67 elementor-widget elementor-widget-text-editor\" data-id=\"a3fff67\" 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 effet, trente ans apr\u00e8s la mesure du spectre du CMB effectu\u00e9e par l\u2019instrument <a href=\"https:\/\/lambda.gsfc.nasa.gov\/product\/cobe\/about_firas.html\" target=\"_blank\" rel=\"noopener\">FIRAS<\/a> de la mission spatiale <a href=\"https:\/\/lambda.gsfc.nasa.gov\/product\/cobe\/\" target=\"_blank\" rel=\"noopener\">COBE<\/a>, aucune autre mesure n\u2019a \u00e9t\u00e9 r\u00e9alis\u00e9e. Bien que COBE ait montr\u00e9 que l\u2019\u00e9mission du CMB suit celle d\u2019un corps noir pratiquement parfait \u00e0 une temp\u00e9rature T\u00a0=\u00a02.7255\u00a0+\/-\u00a00.0006\u00a0K, la th\u00e9orie pr\u00e9dit que des \u00e9carts au spectre de corps noir, appel\u00e9es distorsions spectrales, existent.<\/p><p align=\"justify\">Ces distorsions spectrales [1] sont cr\u00e9\u00e9es par des processus injectant de l\u2019\u00e9nergie, conduisant mati\u00e8re et photons \u00e0 sortir de l\u2019\u00e9quilibre thermique apr\u00e8s que la thermalisation devienne inefficace, \u00e0 un redshift inf\u00e9rieur \u00e0 z=2&#215;10^6. Il existe deux types de distorsions, toutes deux r\u00e9sultants d\u2019un \u00e9change d\u2019\u00e9nergie entre \u00e9lectrons et photons au travers de l\u2019effet Compton. La diffusion Compton est tr\u00e8s inefficace pour un redshift sup\u00e9rieur \u00e0 5&#215;10^4, donnant lieu \u00e0 une distorsion dite de <em>type y<\/em>, tra\u00e7ant l\u2019histoire thermique pendant la recombinaison et la r\u00e9-ionisation. La distorsion de<em> type mu<\/em>, quant \u00e0 elle, intervient \u00e0 un redshift sup\u00e9rieur \u00e0 5&#215;10^4 lorsque la diffusion Compton est tr\u00e8s efficace, et ne peut pas \u00eatre g\u00e9n\u00e9r\u00e9e apr\u00e8s l\u2019\u00e9poque de la recombinaison. De ce fait la mesure de ces distorsions est un moyen unique de suivre l\u2019histoire thermique de notre Univers.<\/p><p>Plusieurs concepts de missions spatiales d\u00e9di\u00e9es ont \u00e9t\u00e9 propos\u00e9es, ou co-propos\u00e9es \u00e0 la NASA ou \u00e0 l\u2019ESA par notre \u00e9quipe (PIXIE [2], <a href=\"https:\/\/www-new.ias.u-psud.fr\/index.php\/2026\/09\/11\/pristine\/\" target=\"_blank\" rel=\"noopener\">PRISTINE<\/a>, FOSSIL).<\/p><p>Le projet BISOU a \u00e9t\u00e9 pr\u00e9sent\u00e9 lors de plusieurs conf\u00e9rences\u00a0:<\/p><ul><li><a href=\"https:\/\/www.worldscientific.com\/worldscibooks\/10.1142\/13149#t=aboutBook\">16th Marcel Grossmann meeting<\/a> (2021), <a href=\"https:\/\/arxiv.org\/abs\/2111.00246\" target=\"_blank\" rel=\"noopener\">BISOU: a balloon project to measure the CMB spectral distortions<\/a><\/li><li>25th ESA symposium on European Rocket and Balloon programmes and related research, Biarritz, 2022<\/li><li>SPIE Astronomical Telescopes + Instrumentation 2022, Montreal. BISOU: a balloon project for spectral observations of the early universe, B. Maffei et al, Proceedings of the SPIE, Volume 12190, id. 121900A\u00a012\u00a0pp. (2022)<\/li><li>SPIE Astronomical Telescopes + Instrumentation 2022, Montreal. Optical analysis of BISOU: a balloon project to measure the CMB spectral distortions, N. Trappe et al, Proceedings of the SPIE, Volume 12190, id. 121901Q\u00a06\u00a0pp. (2022)<\/li><\/ul><p><strong>R\u00e9f\u00e9rences\u00a0:<\/strong><br \/>\u00a0\u00a0\u00a0 1. New horizons in cosmology with spectral distortions of the cosmic microwave background, J. Chluba et al, Experimental Astronomy, Volume 51, Issue 3, p.1515-1554 (2021)<br \/>\u00a0\u00a0\u00a0 2. The Primordial Inflation Explorer (PIXIE), A. Kogut et al, Proceedings of the SPIE, Volume 9904, id. 99040W\u00a023\u00a0pp. (2016)<\/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\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>BISOU (Balloon Interferometer for Spectral Observations of the primordial Universe) est un projet pr\u00e9curseur dont le but est d\u2019effectuer la d\u00e9tection des distorsions spectrales du fond diffus cosmologique (CMB \u2013 Cosmic Microwave Background) \u00e0 partir d&rsquo;un spectrom\u00e8tre embarqu\u00e9 en ballon stratosph\u00e9rique.<\/p>\n","protected":false},"author":3,"featured_media":2904,"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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