{"id":13067,"date":"2021-12-10T23:37:10","date_gmt":"2021-12-10T23:37:10","guid":{"rendered":"https:\/\/www.africa-press.net\/cameroun\/politique\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives"},"modified":"2021-12-11T18:40:54","modified_gmt":"2021-12-11T18:40:54","slug":"premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives","title":{"rendered":"Premi\u00e8re d\u00e9couverte d’une plan\u00e8te g\u00e9ante autour d’une paire d’\u00e9toiles tr\u00e8s massives"},"content":{"rendered":"

Africa-Press – Cameroun. <\/strong><\/span>Elle ne devrait pas exister, et pourtant, \u00ab\u00a0b Cen (AB)b\u00a0\u00bb, une plan\u00e8te g\u00e9ante de type super-Jupiter orbite un syst\u00e8me d’\u00e9toiles tr\u00e8s massif, dans la constellation du Centaure, selon une \u00e9tude d\u00e9voil\u00e9e mercredi.<\/b><\/p>\n

La paire d’\u00e9toiles, baptis\u00e9e \u00ab\u00a0b Cen\u00a0\u00bb, p\u00e8se lourd, avec une masse \u00e9gale de six \u00e0 dix fois celle du Soleil. Or, jusqu’ici, aucune plan\u00e8te n’avait \u00e9t\u00e9 d\u00e9tect\u00e9e autour d’un syst\u00e8me stellaire de plus de trois masses solaires.<\/p>\n

De telles \u00e9toiles \u00ab\u00a0forment un environnement consid\u00e9r\u00e9 comme assez destructeur et dangereux, au point qu’on pensait tr\u00e8s difficile que puisse s’y former de grandes plan\u00e8tes\u00a0\u00bb, a d\u00e9clar\u00e9 l’astronome Markus Janson, de l’Universit\u00e9 de Stockholm, principal auteur de l’\u00e9tude parue dans Nature, et cit\u00e9 par l’Observatoire europ\u00e9en austral (ESO).<\/p>\n

La plus lumineuse des \u00e9toiles jumelles de \u00ab\u00a0b Cen\u00a0\u00bb – \u00e0 environ 325 ann\u00e9es-lumi\u00e8re de la Terre- rayonne \u00e0 une temp\u00e9rature de surface estim\u00e9e \u00e0 plus de 18.000 degr\u00e9s Celsius, soit plus de trois fois celle du Soleil.<\/p>\n

Quand ce dernier \u00e9tait encore en formation, son disque protoplan\u00e9taire, un nuage de gaz et de poussi\u00e8re, a vu se former des plan\u00e8tes, Jupiter en t\u00eate, par agglom\u00e9ration de poussi\u00e8res. Son c\u0153ur rocheux a ensuite accr\u00e9t\u00e9 le gaz qui forme aujourd’hui l’atmosph\u00e8re de la plan\u00e8te la plus massive du syst\u00e8me solaire.<\/p>\n

Mais les \u00e9toiles comme \u00ab\u00a0+b Cen+ sont tellement chaudes et brillantes que leur lumi\u00e8re souffle la mati\u00e8re autour d’elles et qu’il n’y en a pas assez pour former un c\u0153ur rocheux\u00a0\u00bb \u00e0 proximit\u00e9, explique \u00e0 l’AFP l’astronome du CNRS Ga\u00ebl Chauvin, en poste \u00e0 l’Unit\u00e9 mixte franco-chilienne d’astronomie, co-auteur de l’\u00e9tude.<\/p>\n

– Nuage de poussi\u00e8re –<\/b><\/p>\n

Alors, \u00ab\u00a0quel m\u00e9canisme de formation de plan\u00e8te est \u00e0 l\u2019\u0153uvre dans un environnement aussi hostile, en raison des tr\u00e8s fortes radiations?\u00a0\u00bb, interroge le chercheur. Car si la th\u00e9orie rendait peu cr\u00e9dible la formation d’une plan\u00e8te autour d’une \u00e9toile massive, elle a \u00e9t\u00e9 \u00ab\u00a0rattrap\u00e9e par l’observation\u00a0\u00bb.<\/p>\n

A savoir celle du Tr\u00e8s grand t\u00e9lescope de l’ESO, au Chili, et de son instrument SPHERE. La plan\u00e8te qu’il a imag\u00e9e vient enrichir le bestiaire plan\u00e9taire avec des caract\u00e9ristiques remarquables.<\/p>\n

\u00ab\u00a0b Cen(AB)b\u00a0\u00bb appartient \u00e0 la m\u00eame esp\u00e8ce que Jupiter, celle des g\u00e9antes gazeuses, mais elle a presque onze fois sa masse. Surtout, la distance la s\u00e9parant de son couple d’\u00e9toiles est colossale, 100 fois celle s\u00e9parant Jupiter du Soleil.<\/p>\n

Il a d’abord fallu s’assurer que malgr\u00e9 cet \u00e9loignement, l’astre \u00e9tait bien en orbite autour des \u00e9toiles de \u00ab\u00a0b Cen\u00a0\u00bb. Et l\u00e0, surprise, un travail d’archive a \u00e9tabli que la plan\u00e8te avait \u00e9t\u00e9 observ\u00e9e mais pas identifi\u00e9e comme telle par un petit t\u00e9lescope de l’ESO, il y a vingt ans…<\/p>\n

La comparaison avec 2000 a confirm\u00e9 le mouvement propre de la plan\u00e8te, et montr\u00e9 qu’elle se d\u00e9pla\u00e7ait de la m\u00eame mani\u00e8re que son \u00e9toile h\u00f4te. Donc en orbite.<\/p>\n

Quant \u00e0 savoir comment elle a pu se former, \u00ab\u00a0il n’y a pas de sc\u00e9nario privil\u00e9gi\u00e9\u00a0\u00bb, ajoute-t-il. Le syst\u00e8me observ\u00e9 a beau \u00eatre jeune, \u00e0 peine 15 millions d’ann\u00e9es, il est d\u00e9j\u00e0 en place. Il faudrait pouvoir observer un alter-ego en pleine gen\u00e8se, \u00e2g\u00e9 de seulement un \u00e0 deux millions d’ann\u00e9es.<\/p>\n

Pour appara\u00eetre, \u00ab\u00a0b Cen (AB)b\u00a0\u00bb a pu former un c\u0153ur rocheux par agglom\u00e9ration de poussi\u00e8re \u00e0 une distance suffisamment grande de sa paire d’\u00e9toiles, ou bien par un ph\u00e9nom\u00e8ne d’instabilit\u00e9 gravitationnelle, dans lequel une partie du nuage de poussi\u00e8re s’est brusquement effondr\u00e9 sur lui-m\u00eame.<\/p>\n

La qu\u00eate ne fait que commencer. L’\u00e9quipe internationale autour de Markus Janson va chercher \u00e0 conna\u00eetre la composition chimique de la plan\u00e8te. Celle-ci pourrait pointer vers un sc\u00e9nario de formation privil\u00e9gi\u00e9. R\u00e9ponse d’ici quelques ann\u00e9es.<\/p>\n

Pour plus d’informations et d’analyses sur la Cameroun<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Cameroun. Elle ne devrait pas exister, et pourtant, \u00ab\u00a0b Cen (AB)b\u00a0\u00bb, une plan\u00e8te g\u00e9ante de type super-Jupiter orbite un syst\u00e8me d’\u00e9toiles tr\u00e8s massif, dans la constellation du Centaure, selon une \u00e9tude d\u00e9voil\u00e9e mercredi. La paire d’\u00e9toiles, baptis\u00e9e \u00ab\u00a0b Cen\u00a0\u00bb, p\u00e8se lourd, avec une masse \u00e9gale de six \u00e0 dix fois celle du Soleil. […]<\/p>\n","protected":false},"author":82,"featured_media":13066,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[36,50,49],"class_list":["post-13067","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-cameroun","tag-cameroun"],"yoast_head":"\nPremi\u00e8re d\u00e9couverte d'une plan\u00e8te g\u00e9ante autour d'une paire d'\u00e9toiles tr\u00e8s massives - Cameroun<\/title>\n<meta name=\"description\" content=\"Elle ne devrait pas exister, et pourtant, "b Cen (AB)b", une plan\u00e8te g\u00e9ante de type super-Jupiter orbite un syst\u00e8me d ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Premi\u00e8re d\u00e9couverte d'une plan\u00e8te g\u00e9ante autour d'une paire d'\u00e9toiles tr\u00e8s massives\" \/>\n<meta property=\"og:description\" content=\"Elle ne devrait pas exister, et pourtant, "b Cen (AB)b", une plan\u00e8te g\u00e9ante de type super-Jupiter orbite un syst\u00e8me d ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives\" \/>\n<meta property=\"og:site_name\" content=\"Cameroun\" \/>\n<meta property=\"article:published_time\" content=\"2021-12-10T23:37:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-12-11T18:40:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/cameroun\/sites\/57\/2021\/12\/img-61b4f0958723f.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"889\" \/>\n\t<meta property=\"og:image:height\" content=\"585\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Premi\u00e8re d\u00e9couverte d’une plan\u00e8te g\u00e9ante autour d’une paire d’\u00e9toiles tr\u00e8s massives\",\"datePublished\":\"2021-12-10T23:37:10+00:00\",\"dateModified\":\"2021-12-11T18:40:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives\"},\"wordCount\":733,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/cameroun\/sites\/57\/2021\/12\/img-61b4f0958723f.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Cameroun\",\"Cameroun\"],\"articleSection\":[\"Divers\",\"homepage-french\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives\",\"url\":\"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/premiere-decouverte-dune-planete-geante-autour-dune-paire-detoiles-tres-massives\",\"name\":\"Premi\u00e8re d\u00e9couverte d'une plan\u00e8te g\u00e9ante autour d'une paire d'\u00e9toiles tr\u00e8s massives - 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