{"id":10269,"date":"2022-01-12T08:57:11","date_gmt":"2022-01-12T07:57:11","guid":{"rendered":"https:\/\/ggba.swiss\/des-chercheurs-des-universites-de-berne-et-de-geneve-decouvrent-une-exoplanete-en-forme-de-ballon-de-rugby\/"},"modified":"2023-07-04T13:43:47","modified_gmt":"2023-07-04T11:43:47","slug":"des-chercheurs-des-universites-de-berne-et-de-geneve-decouvrent-une-exoplanete-en-forme-de-ballon-de-rugby","status":"publish","type":"post","link":"https:\/\/ggba.swiss\/fr\/des-chercheurs-des-universites-de-berne-et-de-geneve-decouvrent-une-exoplanete-en-forme-de-ballon-de-rugby\/","title":{"rendered":"D\u00e9couverte d’une exoplan\u00e8te en forme de ballon de rugby"},"content":{"rendered":"\n

Gr\u00e2ce au t\u00e9lescope spatial CHEOPS<\/a>, une nouvelle \u00e9tude men\u00e9e par l’Universit\u00e9 de Berne<\/a> en collaboration avec l’Universit\u00e9 de Gen\u00e8ve<\/a> a identifi\u00e9 la forte influence des mar\u00e9es sur l’exoplan\u00e8te WASP-103b, lui donnant plus une forme de ballon de rugby que de sph\u00e8re. C’est la premi\u00e8re fois que la d\u00e9formation d’une exoplan\u00e8te est d\u00e9tect\u00e9e.<\/p>\n

Sur les c\u00f4tes, les mar\u00e9es d\u00e9terminent le rythme des \u00e9v\u00e9nements. \u00c0 mar\u00e9e basse, les bateaux restent sur la terre ferme ; \u00e0 mar\u00e9e haute, le chemin vers la mer leur est \u00e0 nouveau ouvert. Sur Terre, les mar\u00e9es sont principalement g\u00e9n\u00e9r\u00e9es par la lune.<\/p>\n

Sa force gravitationnelle provoque une accumulation d’eau dans la r\u00e9gion oc\u00e9anique situ\u00e9e en dessous, qui fait ensuite baisser le niveau d\u2019eau dans les r\u00e9gions environnantes et explique ainsi la mar\u00e9e basse. Bien que cette d\u00e9formation de l’oc\u00e9an provoque des diff\u00e9rences de niveau frappantes \u00e0 de nombreux endroits, elle est \u00e0 peine reconnaissable depuis l’espace.<\/p>\n

Sur la plan\u00e8te WASP-103b, les mar\u00e9es sont beaucoup plus prononc\u00e9es. La plan\u00e8te tourne autour de son \u00e9toile en un jour seulement et est d\u00e9form\u00e9e par les fortes forces de mar\u00e9e de mani\u00e8re si consid\u00e9rable que son apparence ressemble \u00e0 un ballon de rugby.<\/p>\n

Une mesure sans pr\u00e9c\u00e9dent<\/h4>\n

La plan\u00e8te WASP-103b est situ\u00e9e dans la constellation d’Hercule, fait presque deux fois la taille de Jupiter, a une fois et demie sa masse et est environ cinquante fois plus proche de son \u00e9toile que la Terre ne l’est du Soleil. \u00ab\u00a0En raison de sa grande proximit\u00e9 avec son \u00e9toile, nous avions d\u00e9j\u00e0 soup\u00e7onn\u00e9 que de tr\u00e8s grandes mar\u00e9es \u00e9taient provoqu\u00e9es sur la plan\u00e8te. Mais nous n’avions pas encore pu le v\u00e9rifier\u00a0\u00bb, explique Yann Alibert, co-auteur de l’\u00e9tude, Professeur d’astrophysique \u00e0 l’Universit\u00e9 de Berne et membre de NCCR PlanetS<\/a>.<\/p>\n

Des observations suppl\u00e9mentaires avec CHEOPS et le t\u00e9lescope spatial James Webb seront n\u00e9cessaires pour comprendre le d\u00e9tail de la d\u00e9formation due aux mar\u00e9es et la structure interne de WASP-103b et des exoplan\u00e8tes comparables. \u00ab\u00a0Cela am\u00e9liorerait notre compr\u00e9hension de ces \u00ab\u00a0hot Jupiters\u00a0\u00bb et permettrait une meilleure comparaison entre eux et les plan\u00e8tes g\u00e9antes du syst\u00e8me solaire\u00a0\u00bb, conclut Monika Lendl, Professeure d’astronomie \u00e0 l’Universit\u00e9 de Gen\u00e8ve et co-auteur de l’\u00e9tude.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c0 l’aide du t\u00e9lescope spatial CHEOPS, une \u00e9quipe internationale comprenant des chercheurs des universit\u00e9s de Berne et de Gen\u00e8ve a pu d\u00e9tecter pour la premi\u00e8re fois la d\u00e9formation d’une exoplan\u00e8te.<\/p>\n","protected":false},"author":3,"featured_media":10270,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"mc4wp_mailchimp_campaign":[],"footnotes":""},"categories":[845],"tags":[1066,1079],"class_list":["post-10269","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","tag-optics-fr","tag-space-fr"],"acf":[],"yoast_head":"\nD\u00e9couverte d'une exoplan\u00e8te en forme de ballon de rugby - Greater Geneva Bern area<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ggba.swiss\/fr\/des-chercheurs-des-universites-de-berne-et-de-geneve-decouvrent-une-exoplanete-en-forme-de-ballon-de-rugby\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9couverte d'une exoplan\u00e8te en forme de ballon de rugby - 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