{"id":10415,"date":"2023-12-04T15:40:19","date_gmt":"2023-12-04T15:40:19","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/lhs3154b-la-planete-qui-ne-devrait-pas-exister"},"modified":"2023-12-04T18:31:04","modified_gmt":"2023-12-04T18:31:04","slug":"lhs3154b-la-planete-qui-ne-devrait-pas-exister","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/lhs3154b-la-planete-qui-ne-devrait-pas-exister","title":{"rendered":"LHS3154b, la plan\u00e8te qui ne devrait pas exister"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Au grand bal cosmique qui voit tourner les plane\u0300tes autour des e\u0301toiles, ce couple-la\u0300 n\u2019e\u0301tait gue\u0300re attendu. D\u2019un co\u0302te\u0301, une naine rouge, LHS 3154, petite e\u0301toile pa\u0302lotte et presque \u201cfroide\u201d pour un soleil : environ 2600 \u00b0C. Autour d\u2019elle, a\u0300 seulement 3 millions de km, orbite en 3,5 jours une plane\u0300te ge\u0301ante de type Neptune, LHS3154b. La masse de l\u2019e\u0301toile ne repre\u0301sente que 10 % de celle du soleil. La plane\u0300te, elle, fait 13 fois la masse de la Terre. C\u2019est c\u0327a qui ne colle pas.<\/p>\n

Plane\u0300te et e\u0301toile sont trop proches en masse, 100 fois plus que la Terre et le Soleil par exemple. \u201cLe disque de formation de plane\u0300tes autour d\u2019une e\u0301toile comme LHS 3154 ne devrait pas avoir la masse suffisante pour former cette plane\u0300te. Mais elle est la\u0300. Nous avons donc besoin de revoir notre compre\u0301hension de la formation des plane\u0300tes et des e\u0301toiles\u201d, de\u0301clare Suvrath Mahadevan, de l\u2019Universite\u0301 de Pennsylvanie et co-auteur d\u2019une publication le 30 novembre 2023 dans la revue Science.<\/p>\n

Deux sce\u0301narios pour une naissance, et aucun ne va<\/b><\/p>\n

Les plane\u0300tes peuvent se former de deux fac\u0327ons. Le premier sce\u0301nario envisage la fragmentation d\u2019un disque protoplane\u0301taire sous l\u2019effet de sa propre gravite\u0301. Cela produit de gros amas qui finissent par former des plane\u0300tes massives. L\u2019autre voie consiste en l\u2019accre\u0301tion progressive de poussie\u0300res et de roches sur des protoplane\u0300tes qui grossissent ainsi peu a\u0300 peu, et s\u2019entoure e\u0301ventuellement de gaz. C\u2019est sans doute ce qui s\u2019est passe\u0301 dans notre syste\u0300me solaire. Le premier sce\u0301nario est a priori rejete\u0301 par les chercheurs car LHS3154b est seule dans les parages de son e\u0301toile. Or, la fragmentation du disque auraient du\u0302 faire nai\u0302tre d\u2019autres plane\u0300tes.<\/p>\n

Reste donc la piste de l\u2019accre\u0301tion. Pour tenter de de\u0301crire la naissance de l\u2019improbable plane\u0300te, les chercheurs ont fait tourner les simulations, plus de 300 au total, avec diffe\u0301rentes configurations de disques protoplane\u0301taires comme il en a e\u0301te\u0301 observe\u0301 autour d\u2019autres e\u0301toiles de type naine rouge. Aucune n\u2019a accouche\u0301 d\u2019une plane\u0300te de plus de 10 masses solaires avec une pe\u0301riode infe\u0301rieure a\u0300 10 jours, peut-on lire dans l\u2019article de Science. Le myste\u0300re est donc entier…<\/p>\n

Faire grossir le disque protoplane\u0301taire<\/b><\/p>\n

Me\u0302me si sa pre\u0301sence est inexplicable, l\u2019existence de la plane\u0300te est conside\u0301re\u0301e comme certaine. Elle a e\u0301te\u0301 de\u0301tecte\u0301e par la me\u0301thode des vitesses radiales, gra\u0302ce au spectrographe Habitable Zone Planet Finder (HPF) installe\u0301 sur le te\u0301lescope Hobby-Eberly de l\u2019observatoire McDonald au Texas (Etats-Unis). En capturant la lumie\u0300re e\u0301mise par l\u2019e\u0301toile, les chercheurs ont pu observer que sa longueur d\u2019onde variait pe\u0301riodiquement. Cet effet Doppler traduit les petits mouvements de l\u2019e\u0301toile engendre\u0301s par l\u2019attraction gravitationnelle de LHS3154b. En tout, 137 observations ont eu lieu entre janvier 2020 et avril 2022, afin de de\u0301terminer les caracte\u0301ristiques du couple.<\/p>\n

Puisqu\u2019elle est bien la\u0300, les chercheurs envisagent diffe\u0301rentes pistes pour expliquer sa pre\u0301sence. Notamment, ils songent a\u0300 revoir leurs mode\u0300les de disques protoplane\u0301taires sachant qu\u2019ils n\u2019ont gue\u0300re le choix : la seule fac\u0327on de cre\u0301er une plane\u0300te aussi massive que LHS3154b autour d\u2019une e\u0301toile aussi petite est de partir d\u2019un disque protoplane\u0301taire plus massif, ce qui n\u2019a encore jamais e\u0301te\u0301 vu autour d\u2019une naine rouge. Les observations pre\u0301ce\u0301dentes disques sont-elles biaise\u0301es ? De quelle manie\u0300re ? LHS3154b pose de\u0301cide\u0301ment bien des questions. \u201cCette de\u0301couverte fait vraiment ressortir a\u0300 quel point nous savons peu de choses sur l\u2019Univers\u201d, conclut modestement Suvrath Mahadevan.<\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. Au grand bal cosmique qui voit tourner les plane\u0300tes autour des e\u0301toiles, ce couple-la\u0300 n\u2019e\u0301tait gue\u0300re attendu. D\u2019un co\u0302te\u0301, une naine rouge, LHS 3154, petite e\u0301toile pa\u0302lotte et presque \u201cfroide\u201d pour un soleil : environ 2600 \u00b0C. Autour d\u2019elle, a\u0300 seulement 3 millions de km, orbite en 3,5 jours […]<\/p>\n","protected":false},"author":82,"featured_media":10414,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-10415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\nLHS3154b, la plan\u00e8te qui ne devrait pas exister - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Au grand bal cosmique qui voit tourner les plane\u0300tes autour des e\u0301toiles, ce couple-la\u0300 n\u2019e\u0301tait gue\u0300re attendu. 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