{"id":12116,"date":"2021-10-10T13:49:50","date_gmt":"2021-10-10T13:49:50","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/une-exoplanete-en-orbite-autour-de-trois-etoiles"},"modified":"2021-10-11T05:39:47","modified_gmt":"2021-10-11T05:39:47","slug":"une-exoplanete-en-orbite-autour-de-trois-etoiles","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles","title":{"rendered":"Une exoplan\u00e8te en orbite autour de trois \u00e9toiles?"},"content":{"rendered":"

Africa-Press<\/a> – Tchad<\/a>. <\/strong><\/span>Une toute premi\u00e8re exoplan\u00e8te en orbite autour de trois \u00e9toiles aurait \u00e9t\u00e9 d\u00e9couverte par une \u00e9quipe am\u00e9ricaine d\u2019astrophysiciens. Ce trio stellaire bien particulier nomm\u00e9 GW Orionis se trouve \u00e0 1300 ann\u00e9es-lumi\u00e8re de la Terre.<\/p>\n

Contrairement \u00e0 notre syst\u00e8me solaire, qui se compose d\u2019une seule \u00e9toile, on pense que la moiti\u00e9 des syst\u00e8mes stellaires [\u2026] se composent de deux \u00e9toiles ou plus gravitationnellement li\u00e9es l\u2019une \u00e0 l\u2019autre, expliquent dans un communiqu\u00e9 les scientifiques de l\u2019Universit\u00e9 du Nevada \u00e0 Las Vegas.<\/p>\n

Le syst\u00e8me stellaire triple GW Orionis. L\u2019image de gauche montre la structure annulaire du disque, l\u2019anneau le plus interne \u00e9tant s\u00e9par\u00e9 du reste du disque. L\u2019image de droite montre l\u2019ombre de l\u2019anneau le plus interne sur le reste du disque.<\/p>\n

Des plan\u00e8tes appartenant \u00e0 des syst\u00e8mes solaires binaires ont d\u00e9j\u00e0 \u00e9t\u00e9 d\u00e9couvertes, mais aucune en orbite circumtriple n\u2019avait jamais \u00e9t\u00e9 d\u00e9tect\u00e9e jusqu\u2019\u00e0 maintenant.<\/p>\n

L\u2019astrophysicien Jeremy Smallwood et ses coll\u00e8gues y seraient parvenus gr\u00e2ce aux donn\u00e9es recueillies par au Grand r\u00e9seau d\u2019antennes millim\u00e9trique\/submillim\u00e9trique de l\u2019Atacama (ALMA) install\u00e9 dans le d\u00e9sert d\u2019Atacama, dans le nord du Chili.<\/p>\n

Une myst\u00e9rieuse anomalie<\/b><\/p>\n

Ces chercheurs ont analys\u00e9 les trois anneaux de poussi\u00e8re, essentiels \u00e0 la formation de plan\u00e8tes, autour des \u00e9toiles du syst\u00e8me GW Orionis pour y d\u00e9tecter une myst\u00e9rieuse anomalie.<\/p>\n

Cette br\u00e8che dans la r\u00e9partition de la poussi\u00e8re aurait pu \u00eatre cr\u00e9\u00e9e par la force gravitationnelle des \u00e9toiles, estiment les chercheurs. Mais, apr\u00e8s avoir mod\u00e9lis\u00e9 en d\u00e9tail le syst\u00e8me GW Orionis, ils pensent plut\u00f4t qu\u2019une (ou plusieurs) plan\u00e8te massive de type Jupiter pourrait \u00eatre responsable du ph\u00e9nom\u00e8ne.<\/p>\n

Les g\u00e9antes gazeuses sont g\u00e9n\u00e9ralement les premi\u00e8res plan\u00e8tes \u00e0 se former dans un syst\u00e8me stellaire puis les plan\u00e8tes terrestres comme la Terre et Mars suivent, explique Jeremy Smallwood, auteur principal de ces travaux publi\u00e9s dans les Monthly Notices of the Royal Astronomical Society (Nouvelle fen\u00eatre) (en anglais).<\/p>\n

Pour le moment, la plan\u00e8te elle-m\u00eame n\u2019a pas \u00e9t\u00e9 observ\u00e9e directement, mais ces travaux laissent \u00e0 penser qu\u2019elle s\u2019y trouve. C\u2019est vraiment passionnant, car cela confirme la th\u00e9orie de la formation des plan\u00e8tes. Cela pourrait signifier que la formation des plan\u00e8tes est beaucoup plus active que nous le pensions, ce qui est plut\u00f4t cool, conclut le Dr Smallwood.<\/p>\n

D\u2019autres observations du t\u00e9lescope ALMA seront analys\u00e9es dans les mois \u00e0 venir, et pourraient finalement confirmer son existence gr\u00e2ce \u00e0 des preuves directes.<\/p>\n

Rep\u00e8res<\/b><\/p>\n

Pas moins de 4525 exoplan\u00e8tes ont \u00e9t\u00e9 officiellement d\u00e9tect\u00e9es dans plus de 33 570 syst\u00e8mes plan\u00e9taires. Plus de 7761 exoplan\u00e8tes suppl\u00e9mentaires sont actuellement en attente de confirmation.<\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Tchad. Une toute premi\u00e8re exoplan\u00e8te en orbite autour de trois \u00e9toiles aurait \u00e9t\u00e9 d\u00e9couverte par une \u00e9quipe am\u00e9ricaine d\u2019astrophysiciens. Ce trio stellaire bien particulier nomm\u00e9 GW Orionis se trouve \u00e0 1300 ann\u00e9es-lumi\u00e8re de la Terre. Contrairement \u00e0 notre syst\u00e8me solaire, qui se compose d\u2019une seule \u00e9toile, on pense que la moiti\u00e9 des syst\u00e8mes […]<\/p>\n","protected":false},"author":82,"featured_media":12115,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[37,292,1980,1981,29],"class_list":["post-12116","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-tchad","tag-etoiles","tag-orbite","tag-tchad"],"yoast_head":"\nUne exoplan\u00e8te en orbite autour de trois \u00e9toiles? - tchad<\/title>\n<meta name=\"description\" content=\"Une toute premi\u00e8re exoplan\u00e8te en orbite autour de trois \u00e9toiles aurait \u00e9t\u00e9 d\u00e9couverte par une \u00e9quipe am\u00e9ricaine d\u2019astrop ...\" \/>\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\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Une exoplan\u00e8te en orbite autour de trois \u00e9toiles?\" \/>\n<meta property=\"og:description\" content=\"Une toute premi\u00e8re exoplan\u00e8te en orbite autour de trois \u00e9toiles aurait \u00e9t\u00e9 d\u00e9couverte par une \u00e9quipe am\u00e9ricaine d\u2019astrop ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles\" \/>\n<meta property=\"og:site_name\" content=\"tchad\" \/>\n<meta property=\"article:published_time\" content=\"2021-10-10T13:49:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-10-11T05:39:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2021\/10\/img-6162f2bf2a9f3.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"960\" \/>\n\t<meta property=\"og:image:height\" content=\"540\" \/>\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=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Une exoplan\u00e8te en orbite autour de trois \u00e9toiles?\",\"datePublished\":\"2021-10-10T13:49:50+00:00\",\"dateModified\":\"2021-10-11T05:39:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles\"},\"wordCount\":495,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2021\/10\/img-6162f2bf2a9f3.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Tchad\",\"\u00e9toiles\",\"orbite\",\"Tchad\"],\"articleSection\":[\"Divers\",\"homepage-french\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles\",\"url\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/une-exoplanete-en-orbite-autour-de-trois-etoiles\",\"name\":\"Une exoplan\u00e8te en orbite autour de trois \u00e9toiles? 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