{"id":37748,"date":"2026-02-17T15:47:47","date_gmt":"2026-02-17T14:47:47","guid":{"rendered":"https:\/\/ggba.swiss\/bern-led-project-cheops-discovers-rule-breaking-rocky-planet\/"},"modified":"2026-02-17T15:50:39","modified_gmt":"2026-02-17T14:50:39","slug":"le-telescope-spatial-cheops-decouvre-une-planete-rocheuse-hors-norme","status":"publish","type":"post","link":"https:\/\/ggba.swiss\/fr\/le-telescope-spatial-cheops-decouvre-une-planete-rocheuse-hors-norme\/","title":{"rendered":"Le t\u00e9l\u00e9scope spatial CHEOPS d\u00e9couvre une plan\u00e8te rocheuse hors norme"},"content":{"rendered":"\n<p>Des chercheurs de l\u2019<a href=\"https:\/\/www.unibe.ch\/index_fra.html\">Universit\u00e9 de Berne<\/a> ont jou\u00e9 un r\u00f4le central dans une nouvelle d\u00e9couverte r\u00e9alis\u00e9e par le t\u00e9lescope spatial CHEOPS, qui remet en question les th\u00e9ories \u00e9tablies de la formation des plan\u00e8tes. La mission a identifi\u00e9 une plan\u00e8te rocheuse orbitant au-del\u00e0 de g\u00e9antes gazeuses dans le syst\u00e8me plan\u00e9taire de l\u2019\u00e9toile naine rouge LHS 1903, situ\u00e9e \u00e0 116 ann\u00e9es-lumi\u00e8re de la Terre.<\/p>\n\n\n\n<p>Dans la plupart des syst\u00e8mes plan\u00e9taires connus, y compris notre syst\u00e8me solaire, les plan\u00e8tes rocheuses se forment \u00e0 proximit\u00e9 de leur \u00e9toile h\u00f4te, tandis que les g\u00e9antes gazeuses occupent des orbites plus \u00e9loign\u00e9es. Cependant, la plan\u00e8te nouvellement d\u00e9tect\u00e9e, LHS 1903 e, semble d\u00e9fier ce sch\u00e9ma. Situ\u00e9e au-del\u00e0 de deux g\u00e9antes gazeuses, elle aurait th\u00e9oriquement d\u00fb accumuler une \u00e9paisse enveloppe de gaz. Or, les observations indiquent qu\u2019elle est majoritairement rocheuse.<\/p>\n\n\n\n<p>Cette d\u00e9couverte a \u00e9t\u00e9 rendue possible gr\u00e2ce \u00e0 la pr\u00e9cision photom\u00e9trique exceptionnelle de <a href=\"https:\/\/www.esa.int\/Science_Exploration\/Space_Science\/Cheops\">CHEOPS<\/a>, une mission conjointe de l\u2019Agence spatiale europ\u00e9enne et de la Suisse, dirig\u00e9e par l\u2019Universit\u00e9 de Berne en collaboration avec l\u2019<a href=\"https:\/\/www.unige.ch\/\">Universit\u00e9 de Gen\u00e8ve<\/a>. Des chercheurs bernois, notamment issus de la Division de recherche spatiale et sciences plan\u00e9taires et du P\u00f4le de recherche national <a href=\"https:\/\/nccr-planets.ch\/fr\/\">PlanetS<\/a>, ont contribu\u00e9 tant \u00e0 l\u2019analyse des observations qu\u2019\u00e0 la mod\u00e9lisation de la formation plan\u00e9taire.<\/p>\n\n\n\n<p>Les simulations d\u00e9velopp\u00e9es \u00e0 l\u2019Universit\u00e9 de Berne sugg\u00e8rent que la plan\u00e8te rocheuse externe se serait form\u00e9e plus tard que les g\u00e9antes gazeuses voisines, apr\u00e8s la dissipation de la majeure partie du gaz du disque protoplan\u00e9taire. Ce sc\u00e9nario soutient l\u2019hypoth\u00e8se d\u2019une formation \u00ab de l\u2019int\u00e9rieur vers l\u2019ext\u00e9rieur \u00bb, selon laquelle les plan\u00e8tes se forment successivement plut\u00f4t que simultan\u00e9ment.<\/p>\n\n\n\n<p>Cette d\u00e9couverte souligne le leadership de longue date de Berne dans la recherche spatiale et les sciences plan\u00e9taires. Depuis son lancement en 2019, CHEOPS continue d\u2019affiner la compr\u00e9hension de la diversit\u00e9 des exoplan\u00e8tes, renfor\u00e7ant le r\u00f4le de la Suisse occidentale dans l\u2019exploration spatiale europ\u00e9enne et l\u2019\u00e9tude de l\u2019\u00e9volution des syst\u00e8mes plan\u00e9taires.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le projet CHEOPS, dirig\u00e9 par l\u2019Universit\u00e9 de Berne, a identifi\u00e9 une plan\u00e8te rocheuse inattendue au-del\u00e0 de g\u00e9antes gazeuses, remettant en question les mod\u00e8les actuels de formation plan\u00e9taire.<\/p>\n","protected":false},"author":6,"featured_media":37745,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"mc4wp_mailchimp_campaign":[],"footnotes":""},"categories":[845],"tags":[1187,1162,1228,1189],"class_list":["post-37748","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","tag-aerospace-fr-2","tag-education-en-fr","tag-optics-fr-2","tag-space-fr-2"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le t\u00e9l\u00e9scope CHEOPS d\u00e9couvre une plan\u00e8te rocheuse hors norme<\/title>\n<meta name=\"description\" content=\"Le projet CHEOPS a identifi\u00e9 une plan\u00e8te rocheuse remettant en question les mod\u00e8les actuels de formation plan\u00e9taire.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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