{"id":22686,"date":"2026-04-29T14:44:11","date_gmt":"2026-04-29T14:44:11","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=22686"},"modified":"2026-04-29T14:46:14","modified_gmt":"2026-04-29T14:46:14","slug":"ristretto-un-outil-pour-sonder-latmosphere-des-exoplanetes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/04\/29\/ristretto-un-outil-pour-sonder-latmosphere-des-exoplanetes\/","title":{"rendered":"RISTRETTO, un outil pour sonder l&#8217;atmosph\u00e8re des exoplan\u00e8tes"},"content":{"rendered":"<p><strong>Le spectrographe \u00e0 haute pr\u00e9cision RISTRETTO sera d\u00e9di\u00e9 \u00e0 l&#8217;\u00e9tude d&#8217;exoplan\u00e8tes proches, comme Proxima b.<\/strong><\/p>\n<h5>Une exoplan\u00e8te prometteuse :<\/h5>\n<p>\u00c0 un peu plus de 4 <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Ann%C3%A9e-lumi%C3%A8re\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a>, Proxima b est \u00e0 ce jour l&#8217;<a href=\"https:\/\/cnes.fr\/dossiers\/exoplanetes\" target=\"_blank\" rel=\"noopener\">exoplan\u00e8te<\/a> la plus proche du <a href=\"https:\/\/cnes.fr\/dossiers\/systeme-solaire\" target=\"_blank\" rel=\"noopener\">Syst\u00e8me solaire<\/a>. Sa d\u00e9couverte a \u00e9t\u00e9 annonc\u00e9e en 2016 par l&#8217;ESO (lire <a href=\"https:\/\/www.eso.org\/public\/france\/news\/eso1629\/\" target=\"_blank\" rel=\"noopener\">ici<\/a>). Elle orbite dans la zone habitable d&#8217;une <a href=\"https:\/\/www.science-et-vie.com\/ciel-et-espace\/etoile\/quest-ce-quune-naine-rouge-127161.html\" target=\"_blank\" rel=\"noopener\">naine rouge<\/a>, Proxima, situ\u00e9e dans la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Centaure_(constellation)\" target=\"_blank\" rel=\"noopener\">constellation australe du Centaure<\/a>. Les astronomes pensent que cette exoplan\u00e8te (d&#8217;une masse l\u00e9g\u00e8rement sup\u00e9rieure \u00e0 celle de la Terre) est probablement <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Plan%C3%A8te_tellurique\" target=\"_blank\" rel=\"noopener\">tellurique<\/a>. Ils aimeraient donc beaucoup en \u00e9tudier l&#8217;atmosph\u00e8re. Probl\u00e8me : l&#8217;exoplan\u00e8te est noy\u00e9e dans l&#8217;\u00e9clat de son \u00e9toile, un million de fois plus lumineuse ! Des chercheurs de l&#8217;Universit\u00e9 de Gen\u00e8ve ont donc mis au point un spectrographe \u00e0 haute pr\u00e9cision, <a href=\"https:\/\/www.unige.ch\/medias\/2025\/tests-concluants-pour-lexplorateur-dexoplanetes-ristretto\" target=\"_blank\" rel=\"noopener\">RISTRETTO<\/a>. L&#8217;instrument est actuellement en test \u00e0 l&#8217;observatoire de Haute-Provence :<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/www.facebook.com\/plugins\/video.php?height=314&#038;href=https%3A%2F%2Fwww.facebook.com%2Freel%2F26587029850936094%2F&#038;show_text=false&#038;width=560&#038;t=0\" width=\"560\" height=\"314\" style=\"border:none;overflow:hidden\" scrolling=\"no\" frameborder=\"0\" allowfullscreen=\"true\" allow=\"autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share\" class=\"iframe-class\"><\/iframe>\n\n<p>Tout un symbole, puisque c&#8217;est l\u00e0 que les astronomes suisses Michel Mayor et Didier Queloz d\u00e9couvraient <a href=\"https:\/\/www.unige.ch\/medias\/2025\/la-premiere-exoplanete-etait-decouverte-il-y-30-ans-lunige\" target=\"_blank\" rel=\"noopener\">la premi\u00e8re exoplan\u00e8te en 1995<\/a>. une fois test\u00e9, RISTRETTO prendra la direction du Chili. Install\u00e9 derri\u00e8re l&#8217;un des<a href=\"https:\/\/www.eso.org\/public\/france\/teles-instr\/paranal-observatory\/vlt\/\" target=\"_blank\" rel=\"noopener\"> Very Large Telescope<\/a>, il pourra alors tenter de caract\u00e9riser l&#8217;atmosph\u00e8re de quelques exoplan\u00e8tes proches.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/06\/en-haute-provence-un-telescope-traque-les-exoplanetes\/\" target=\"_blank\" rel=\"noopener\">En Haute-Provence, un t\u00e9lescope traque les exoplan\u00e8tes<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/26\/exoplanetes-indices-spectre-stellaire-de-1917\/\" target=\"_blank\" rel=\"noopener\">Exoplan\u00e8tes : des indices sur un spectre de 1917<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/28\/gliese-436b-lexoplanete-qui-traine-une-queue-dhydrogene\/\" target=\"_blank\" rel=\"noopener\">Gliese 436b, l\u2019exoplan\u00e8te qui tra\u00eene une queue d\u2019hydrog\u00e8ne<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Le spectrographe \u00e0 haute pr\u00e9cision RISTRETTO sera d\u00e9di\u00e9 \u00e0 l&#8217;\u00e9tude d&#8217;exoplan\u00e8tes proches, comme Proxima b. Une exoplan\u00e8te prometteuse : \u00c0 un peu plus de 4 ann\u00e9es-lumi\u00e8re, Proxima b est \u00e0 ce jour l&#8217;exoplan\u00e8te la plus proche du Syst\u00e8me solaire. Sa d\u00e9couverte a \u00e9t\u00e9 annonc\u00e9e en 2016 par l&#8217;ESO (lire ici). Elle orbite dans la zone &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/04\/29\/ristretto-un-outil-pour-sonder-latmosphere-des-exoplanetes\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">RISTRETTO, un outil pour sonder l&#8217;atmosph\u00e8re des exoplan\u00e8tes<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":22693,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[3953,3952,880,1013],"class_list":["post-22686","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-proxima-b","tag-ristretto","tag-spectrographe","tag-video"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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