{"id":3981,"date":"2022-02-22T16:15:52","date_gmt":"2022-02-22T15:15:52","guid":{"rendered":"https:\/\/www-new.ias.u-psud.fr\/?p=3981"},"modified":"2026-09-23T17:56:32","modified_gmt":"2026-09-23T15:56:32","slug":"des-nano-diamants-caches-dans-le-milieu-interstellaire","status":"publish","type":"post","link":"https:\/\/www.ias.u-psud.fr\/index.php\/2022\/02\/22\/des-nano-diamants-caches-dans-le-milieu-interstellaire\/","title":{"rendered":"Des nano-diamants cach\u00e9s dans le milieu interstellaire"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3981\" class=\"elementor elementor-3981\" 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=\"412\" height=\"317\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-crystal.png\" class=\"attachment-large size-large wp-image-3985\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-crystal.png 412w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-crystal-300x231.png 300w\" sizes=\"(max-width: 412px) 100vw, 412px\" \/>\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-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>Repr\u00e9sentation sch\u00e9matique des surfaces des nano-diamants avec des groupes CH et CH2 sur les facettes.<\/p>\t\t\t\t\t\t\t\t<\/div>\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\">Des nano-diamants cach\u00e9s dans le milieu interstellaire<\/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>Les nano-diamants sont une des composantes les plus \u00e9nigmatiques de la poussi\u00e8re cosmique. Une fraction importante des nano-diamants pr\u00e9-solaires extraits des m\u00e9t\u00e9orites primitives est associ\u00e9e \u00e0 des supernovas lointaines. Constitutifs de nombreuses m\u00e9t\u00e9orites, observ\u00e9s dans seulement deux disques proto-plan\u00e9taires et une \u00e9toile \u00e9volu\u00e9e, ils n&rsquo;ont jamais \u00e9t\u00e9 observ\u00e9s dans le milieu interstellaire. Gr\u00e2ce aux nouveaux calculs du mod\u00e8le de poussi\u00e8re THEMIS d\u00e9velopp\u00e9 \u00e0 l&rsquo;IAS, nous expliquons pourquoi il est difficile d&rsquo;observer les nano-diamants dans l\u2019espace.<\/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<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>Dans le milieu interstellaire diffus, environ 50 % du carbone se trouve dans la poussi\u00e8re. Si 3 \u00e0 5 % du carbone se trouvaient dans les nano-diamants \u2014 ce qui correspondrait \u00e0 l&rsquo;abondance m\u00e9t\u00e9oritique pr\u00e9-solaire \u2014 ils seraient ind\u00e9tectables en \u00e9mission thermique et en extinction. Les constantes optiques des nano-diamants nouvellement calcul\u00e9es par le mod\u00e8le THEMIS montrent en effet que leurs caract\u00e9ristiques infrarouges seraient en effet noy\u00e9es par d&rsquo;autres caract\u00e9ristiques d&rsquo;\u00e9mission de poussi\u00e8res carbon\u00e9es (voir la figure ci-dessous). Ainsi, jusqu&rsquo;\u00e0 quelques pour cent du budget du carbone disponible pourraient \u00eatre cach\u00e9s sous forme de nano-diamants.<\/p><p>Pour les quelques r\u00e9gions circumstellaires o\u00f9 l&rsquo;\u00e9mission de nano-diamants a \u00e9t\u00e9 d\u00e9tect\u00e9e, les observations avec l&rsquo;instrument MATISSE au VLTI permettront de contraindre leur localisation \u00e0 l\u2019\u00e9chelle de l\u2019unit\u00e9 astronomique. Il s&rsquo;agit d\u2019obtenir des informations sur leurs tailles, leurs compositions et leur \u00e9volution, toujours gr\u00e2ce au mod\u00e8le THEMIS. Cela pourrait nous permettre de mieux comprendre les propri\u00e9t\u00e9s des nano-diamants m\u00e9t\u00e9oritiques pr\u00e9-solaires (comme leurs tailles, de l&rsquo;ordre de 2 \u00e0 3 nm). Les constantes optiques calcul\u00e9es par THEMIS fournissent un moyen d&rsquo;explorer leur existence et leur viabilit\u00e9 dans un large \u00e9ventail de sources astronomiques.<\/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-387dca1 e-con e-atomic-element e-flexbox-base e-356ef4e \" data-id=\"387dca1\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"387dca1\">\n    \t\t<div class=\"elementor-element elementor-element-5a5d233 elementor-widget elementor-widget-image\" data-id=\"5a5d233\" 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=\"662\" height=\"506\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-emission.png\" class=\"attachment-large size-large wp-image-3983\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-emission.png 662w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-emission-300x229.png 300w\" sizes=\"(max-width: 662px) 100vw, 662px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-971042f e-con e-atomic-element e-flexbox-base e-971042f-752270f \" data-id=\"971042f\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"971042f\">\n    \t\t<div class=\"elementor-element elementor-element-8d56b97 elementor-widget elementor-widget-text-editor\" data-id=\"8d56b97\" 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>\u00c9mission des composantes de la poussi\u00e8re interstellaire diffuse incluant des nano-diamants hydrog\u00e9n\u00e9s (ligne en bleu).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-5fe98c8 e-con e-atomic-element e-flexbox-base e-5fe98c8-0afa60d \" data-id=\"5fe98c8\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"5fe98c8\">\n    \t\t<div class=\"elementor-element elementor-element-2bb139d elementor-widget elementor-widget-image\" data-id=\"2bb139d\" 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=\"662\" height=\"672\" src=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-size.png\" class=\"attachment-large size-large wp-image-3984\" alt=\"\" srcset=\"https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-size.png 662w, https:\/\/www.ias.u-psud.fr\/wp-content\/uploads\/2022\/02\/202202-diamants-size-296x300.png 296w\" sizes=\"(max-width: 662px) 100vw, 662px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-00551c2 e-con e-atomic-element e-flexbox-base e-96599f0 \" data-id=\"00551c2\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"00551c2\">\n    \t\t<div class=\"elementor-element elementor-element-c6edf74 elementor-widget elementor-widget-text-editor\" data-id=\"c6edf74\" 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>Distribution en taille des composantes de la poussi\u00e8re interstellaire diffuse incluant des nano-diamants hydrog\u00e9n\u00e9s (ligne en bleu) avec une abondance proche de celle de l&rsquo;abondance dans les m\u00e9t\u00e9orites.<\/p>\t\t\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=habart\">Anthony Jones<\/a>, Directeur de recherche, \u00e9quipe AMIS<\/li><li>Nathalie Ysard<\/li><li><a href=\"https:\/\/www.ias.u-psud.fr\/annuaire?nom=habart\">\u00c9milie Habart<\/a>, Ma\u00eetresse de conf\u00e9rences, Responsable de l&rsquo;\u00e9quipe AMIS<\/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-fadb250 e-con-full e-flex e-con e-child\" data-id=\"fadb250\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5640f83 elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"5640f83\" 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\u00e9rences<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f6323b3 elementor-widget elementor-widget-text-editor\" data-id=\"f6323b3\" 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><a href=\"https:\/\/arxiv.org\/abs\/2111.04492\" target=\"_blank\" rel=\"noopener\">Article dans A&amp;A<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Les nano-diamants sont une des composantes les plus \u00e9nigmatiques de la poussi\u00e8re cosmique.<\/p>\n","protected":false},"author":3,"featured_media":3985,"comment_status":"closed","ping_status":"closed","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[5,24],"tags":[],"class_list":["post-3981","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-scientifiques-home","category-caps-scientifiques"],"_links":{"self":[{"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/posts\/3981","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/comments?post=3981"}],"version-history":[{"count":5,"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/posts\/3981\/revisions"}],"predecessor-version":[{"id":3989,"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/posts\/3981\/revisions\/3989"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/media\/3985"}],"wp:attachment":[{"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/media?parent=3981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/categories?post=3981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ias.u-psud.fr\/index.php\/wp-json\/wp\/v2\/tags?post=3981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}