{"id":10389,"date":"2023-12-03T10:58:13","date_gmt":"2023-12-03T10:58:13","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/decouverte-dun-nouveau-systeme-de-six-planetes-en-resonance"},"modified":"2023-12-04T11:37:39","modified_gmt":"2023-12-04T11:37:39","slug":"decouverte-dun-nouveau-systeme-de-six-planetes-en-resonance","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/decouverte-dun-nouveau-systeme-de-six-planetes-en-resonance","title":{"rendered":"D\u00e9couverte d\u2019un nouveau syst\u00e8me de six plan\u00e8tes en r\u00e9sonance"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>A 100 anne\u0301es-lumie\u0300re de la\u0300, dans la constellation de la Chevelure de Be\u0301re\u0301nice, l\u2019e\u0301toile HD110067 est entoure\u0301e d\u2019un syste\u0300me plane\u0301taire dont les astronomes ont mis du temps a\u0300 comprendre le fonctionnement. Initialement de\u0301couvert par le te\u0301lescope spatial TESS de la Nasa, le chasseur d\u2019exoplane\u0300tes aux innombrables trophe\u0301es, ils ont eu besoin des lumie\u0300res d\u2019un autre instrument en orbite, le satellite Cheops de l\u2019Agence spatiale europe\u0301enne, pour re\u0301soudre l\u2019organisation des corps de ce syste\u0300me. Et les re\u0301sultats indiquent qu\u2019ils sont tombe\u0301s sur quelque chose de tre\u0300s rare qui ouvre de passionnantes possibilite\u0301s d\u2019e\u0301tude pour comprendre la formation des plane\u0300tes de type sous-Neptune.<\/p>\n

Des plane\u0300tes qui se de\u0301voilent<\/b><\/p>\n

En 2020, TESS a de\u0301tecte\u0301 des baisses de luminosite\u0301 de HD110067 qui indiquait qu\u2019une ou des plane\u0300tes transitaient devant elle. Une analyse pre\u0301liminaire a permis de suspecter la pre\u0301sence de deux corps dont le premier avait une orbite de 5,642 jours tandis que celle de l\u2019autre n\u2019a pu e\u0302tre pre\u0301cise\u0301. Deux ans plus tard, TESS a observe\u0301 la me\u0302me e\u0301toile mais les nouvelles donne\u0301es invalidaient les estimations pre\u0301ce\u0301dentes, me\u0302me si elles plaidaient toujours en faveur de l\u2019existence de deux exoplane\u0300tes.<\/p>\n

\u201cC\u2019est a\u0300 ce moment-la\u0300 que nous avons de\u0301cide\u0301 d\u2019utiliser Cheops. Nous sommes alle\u0301s a\u0300 la pe\u0302che aux signaux parmi toutes les pe\u0301riodes potentielles que ces plane\u0300tes auraient pu avoir\u201d explique, lors d\u2019une confe\u0301rence de presse en ligne, Rafael Luque, de l\u2019Universite\u0301 de Chicago (Etats-Unis). Une initiative couronne\u0301e de succe\u0300s puisque Cheops a permis de confirmer l\u2019existence des deux plane\u0300tes et d\u2019en de\u0301tecter une troisie\u0300me. Surtout, la dure\u0301e des pe\u0301riodes de ces trois astres a re\u0301ve\u0301le\u0301 qu\u2019ils e\u0301taient pris dans les filets d\u2019une chai\u0302ne de re\u0301sonance orbitale. Une cle\u0301 qui a permis de de\u0301verrouiller l\u2019inte\u0301gralite\u0301 du syste\u0300me dont la pre\u0301sentation fait l\u2019objet d\u2019une publication dans la revue Nature.<\/p>\n

Un syste\u0300me en re\u0301sonance<\/b><\/p>\n

On parle de chai\u0302ne de re\u0301sonance lorsque plusieurs plane\u0300tes se retrouvent pe\u0301riodiquement dans la me\u0302me configuration apre\u0300s avoir effectue\u0301 un nombre d\u2019orbites potentiellement diffe\u0301rent. Par exemple, dans le cas d\u2019une re\u0301sonance 2:1, la plane\u0300te interne d\u2019un syste\u0300me e\u0301voluant ainsi effectuerait exactement deux tours pendant que la plane\u0300te externe en fait exactement un.<\/p>\n

Un tel phe\u0301nome\u0300ne s\u2019observe dans le syste\u0300me solaire avec trois des lunes de Jupiter : Io, Europe et Ganyme\u0300de. Quand Io, la plus proche de la ge\u0301ante, effectue quatre orbites, Europe en boucle deux et Ganyme\u0300de, la plus e\u0301loigne\u0301e, en ache\u0300ve une. On dit qu\u2019elles sont en re\u0301sonance 4:2:1. D\u2019autres syste\u0300mes stellaires e\u0301voluent aussi selon des re\u0301sonances orbitales comme WASP-148 avec deux exoplane\u0300tes dans une configuration 4:1 ou TOI-178 au sein duquel cinq plane\u0300tes sur six (hormis la plane\u0300te la plus proche) sont dans une chai\u0302ne de re\u0301sonance de type 18:9:6:4:3.<\/p>\n

Dans le syste\u0300me HD110067, la plus e\u0301loigne\u0301e des trois plane\u0300tes observe\u0301es par Cheops, HD110067 d, met 20,519 jours pour faire le tour de son e\u0301toile. Soit presque exactement 1,5 fois le temps que met la seconde plane\u0300te (c) a\u0300 orbiter (13,673 jours). Et elle-me\u0302me a\u0300 une pe\u0301riode orbitale 1,5 fois plus longue que la plane\u0300te la plus proche (b) dont l\u2019anne\u0301e dure 9,114 jours. Dit autrement : la plane\u0300te b accomplit trois orbites quand la plane\u0300te c en fait deux et pareillement c en fait trois quand d en fait deux. C\u2019est une re\u0301sonance de type 3:2. \u201cCheops nous a donne\u0301 cette configuration re\u0301sonante qui nous a permis de pre\u0301dire toutes les autres pe\u0301riodes. Sans cette de\u0301tection de Cheops, cela aurait e\u0301te\u0301 impossible\u201d, explique Rafael Luque.<\/p>\n

Ainsi, gra\u0302ce au de\u0301cryptage de cette chai\u0302ne de re\u0301sonance, les chercheurs ont pu identifier trois nouvelles plane\u0300tes (e, f et g) avec des re\u0301sonances de 3:2, 4:3 et 4:3. Elles ont des pe\u0301riodes orbitales de respectivement 30,793, 41,058 et 54,769 jours. \u201cC\u2019est une golden target qui ressemble quasi exactement a\u0300 nos mode\u0300les d\u2019organisation des plane\u0300tes quand le disque protoplane\u0301taire vient tout juste de se dissiper. C\u2019est formidable d\u2019avoir de\u0301couvert cela\u201d, se re\u0301jouit Adrien Leleu, de l\u2019Universite\u0301 de Gene\u0300ve.<\/p>\n

Un milliard d\u2019anne\u0301es de tranquillite\u0301<\/b><\/p>\n

Si les jeunes plane\u0300tes ont tendance a\u0300 se former en respectant une chai\u0302ne de re\u0301sonance, leur rythme peut facilement e\u0302tre de\u0301range\u0301 par des e\u0301ve\u0300nements qui se produisent dans leur syste\u0300me. La migration d\u2019une grosse plane\u0300te (comme Jupiter ou Saturne) vers le centre, le passage d\u2019une e\u0301toile a\u0300 proximite\u0301 ou un impact ge\u0301ant sont autant de causes de perturbations a\u0300 me\u0302me de briser la chai\u0302ne de re\u0301sonance. Ainsi, les astronomes connaissent beaucoup de syste\u0300mes ou\u0300 les plane\u0300tes ont pu e\u0302tre un jour en re\u0301sonance, mais qui ont connu un bouleversement et pre\u0301sentent de\u0301sormais des orbites alte\u0301re\u0301es.<\/p>\n

Au final, les syste\u0300mes multi-plane\u0301taires pre\u0301servant leur re\u0301sonance sont rares. \u201cNous pensons qu\u2019environ 1% seulement de tous les syste\u0300mes restent en re\u0301sonance\u201d, explique Rafael Luque. HD110067 est d\u2019autant plus inte\u0301ressant que son e\u0301toile n\u2019est pas une jeune premie\u0300re : elle est a\u0302ge\u0301e d\u2019environ 1 milliard d\u2019anne\u0301es. Cela refle\u0300te donc une longue pe\u0301riode de tranquillite\u0301 a\u0300 l\u2019inte\u0301rieur de ce syste\u0300me, indispensable au maintien de cette re\u0301sonance. \u201cC\u2019est quelque chose que nous devons e\u0301tudier plus avant pour comprendre comment cette stabilite\u0301 s\u2019est maintenue au fil du temps\u201d a-t-il ajoute\u0301.<\/p>\n

\u201cUn type de plane\u0300te qui n\u2019existe pas dans notre syste\u0300me solaire\u201d<\/b><\/p>\n

Les six plane\u0300tes de ce syste\u0300me ont toutes un rayon supe\u0301rieur a\u0300 celui de la Terre et infe\u0301rieur a\u0300 celui de Neptune. Elles entrent donc dans la cate\u0301gorie des sous-Neptunes. Au vu de leur densite\u0301, les astronomes estiment qu\u2019elles posse\u0300dent sans doute un c\u0153ur solide (su\u0302rement de fer) mais qui est entoure\u0301 d\u2019une vaste atmosphe\u0300re d\u2019hydroge\u0300ne et d\u2019he\u0301lium. \u201cUn type de plane\u0300te qui n\u2019existe pas dans notre syste\u0300me solaire\u201d pre\u0301cise Enric Palle, un des co-auteurs de l\u2019e\u0301tude. Ce qui en fait de bonnes candidates pour des observations ulte\u0301rieures a\u0300 l\u2019aide du te\u0301lescope James Webb de la Nasa, dont la pre\u0301cision permettra de de\u0301terminer la composition de ces atmosphe\u0300res.<\/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. A 100 anne\u0301es-lumie\u0300re de la\u0300, dans la constellation de la Chevelure de Be\u0301re\u0301nice, l\u2019e\u0301toile HD110067 est entoure\u0301e d\u2019un syste\u0300me plane\u0301taire dont les astronomes ont mis du temps a\u0300 comprendre le fonctionnement. Initialement de\u0301couvert par le te\u0301lescope spatial TESS de la Nasa, le chasseur d\u2019exoplane\u0300tes aux innombrables trophe\u0301es, ils ont […]<\/p>\n","protected":false},"author":82,"featured_media":10388,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-10389","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":"\nD\u00e9couverte d\u2019un nouveau syst\u00e8me de six plan\u00e8tes en r\u00e9sonance - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"A 100 anne\u0301es-lumie\u0300re de la\u0300, dans la constellation de la Chevelure de Be\u0301re\u0301nice, l\u2019e\u0301toile HD110067 est entoure\u0301e d\u2019u ...\" \/>\n<meta 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