{"id":44928,"date":"2023-05-26T21:08:41","date_gmt":"2023-05-26T21:08:41","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre"},"modified":"2023-05-26T22:32:48","modified_gmt":"2023-05-26T22:32:48","slug":"decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre","title":{"rendered":"D\u00e9couverte d\u2019une exoplan\u00e8te volcanique de la taille de la Terre"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>A 90 anne\u0301es-lumie\u0300re de la Terre, dans la petite constellation de la Coupe (visible dans l\u2019he\u0301misphe\u0300re sud), le syste\u0300me LP 791-18 se compose d\u2019une petite e\u0301toile de type naine rouge et d\u2019au moins trois plane\u0300tes. Deux ont e\u0301te\u0301 de\u0301couvertes en 2019 gra\u0302ce a\u0300 la me\u0301thode des transits par le chasseur de plane\u0300te qu\u2019est le te\u0301lescope TESS. LP 791-18 b est une super Terre, le\u0301ge\u0300rement plus grande que notre plane\u0300te, avec une pe\u0301riode orbitale d\u2019un peu moins d\u2019une journe\u0301e, tandis que LP 791-18 est qualifie\u0301e de mini Neptune avec un diame\u0300tre 2,5 fois plus grand que la Terre et situe\u0301e plus loin de son astre dont elle fait le tour en cinq jours. Entre ces deux exoplane\u0300tes, une nouvelle a e\u0301te\u0301 de\u0301niche\u0301e : LP 791-18 d dans les dernie\u0300res donne\u0301es du te\u0301lescope Spitzer puis confirme\u0301e par TESS.<\/p>\n

Une orbite perturbe\u0301e<\/b><\/p>\n

Ce troisie\u0300me astre est tre\u0300s similaire a\u0300 la Terre en termes de masse et de dimension et il orbite en 2,8 jours autour de la naine rouge. Comme cette dernie\u0300re est bien moins lumineuse que le Soleil, la tempe\u0301rature moyenne de la plane\u0300te n\u2019est pas si e\u0301leve\u0301e que c\u0327a : entre 25 et un peu plus de 100\u00b0C, soit bien moins que sur Ve\u0301nus ou\u0300 il fait pre\u0300s de 450\u00b0C. Mais la proximite\u0301 de l\u2019e\u0301toile fait que la plane\u0300te est gravitationnellement verrouille\u0301e : une face constamment tourne\u0301e vers la lumie\u0300re et l\u2019autre plonge\u0301e dans l\u2019obscurite\u0301.<\/p>\n

Si cette plane\u0300te contient de l\u2019eau, il est donc possible que celle-ci se condense du co\u0302te\u0301 obscur, plus tempe\u0301re\u0301. Ce qui a e\u0301galement interpelle\u0301 les astrophysiciens de l\u2019Institut Trottier de recherche sur les exoplane\u0300tes, de l\u2019Universite\u0301 de Montre\u0301al, c\u2019est l\u2019orbite de LP 791-18 d qui est plus elliptique que circulaire. Ils expliquent cette particularite\u0301 dans leur e\u0301tude publie\u0301e dans la revue Nature : les plane\u0300tes c et d de ce syste\u0300me passent re\u0301gulie\u0300rement tre\u0300s proches l\u2019une de l\u2019autre, a\u0300 moins de 1,33 million de kilome\u0300tres au plus pre\u0300s. Soit une distance 33 fois plus petite que celle qui se\u0301pare Mars de la Terre. A chaque passage proche s\u2019exerce donc une traction gravitationnelle sur la plane\u0300te d, qui de\u0301forme son orbite.<\/p>\n

Un astre volcanique<\/b><\/p>\n

Cette orbite elliptique fait qu\u2019a\u0300 chaque tour de LP 791-18 d autour de son e\u0301toile, celle-ci se de\u0301forme le\u0301ge\u0300rement en raison des effets de mare\u0301e. Ces fre\u0301quentes de\u0301formations chauffent l\u2019inte\u0301rieur de la plane\u0300te et cette e\u0301nergie thermique est probablement e\u0301vacue\u0301e a\u0300 la surface de l\u2019astre par un intense volcanisme. Ce phe\u0301nome\u0300ne est connu dans le syste\u0300me solaire ou\u0300 il affecte Io, une des lunes de Jupiter avec des centaines de volcans a\u0300 sa surface. Ce fort volcanisme pourrait contribuer a\u0300 la pre\u0301sence d\u2019une atmosphe\u0300re persistante autour de l\u2019exoplane\u0300te. Celle-ci devient du coup une cible de choix pour de futures investigations avec le te\u0301lescope James Webb qui pourrait parvenir a\u0300 la de\u0301tecter. D\u2019ici la\u0300, l\u2019engin est de\u0301ja\u0300 re\u0301serve\u0301 pour scruter la plane\u0300te c (la mini Neptune) qui, elle, posse\u0300de une atmosphe\u0300re bien plus e\u0301paisse qui sera plus facilement observable.<\/p>\n

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

Africa-Press – Senegal. A 90 anne\u0301es-lumie\u0300re de la Terre, dans la petite constellation de la Coupe (visible dans l\u2019he\u0301misphe\u0300re sud), le syste\u0300me LP 791-18 se compose d\u2019une petite e\u0301toile de type naine rouge et d\u2019au moins trois plane\u0300tes. Deux ont e\u0301te\u0301 de\u0301couvertes en 2019 gra\u0302ce a\u0300 la me\u0301thode des transits par le chasseur de plane\u0300te […]<\/p>\n","protected":false},"author":82,"featured_media":44927,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[43,47,44],"class_list":["post-44928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press-2","tag-africa-press-senegal","tag-senegal-2"],"yoast_head":"\nD\u00e9couverte d\u2019une exoplan\u00e8te volcanique de la taille de la Terre - Senegal<\/title>\n<meta name=\"description\" content=\"A 90 anne\u0301es-lumie\u0300re de la Terre, dans la petite constellation de la Coupe (visible dans l\u2019he\u0301misphe\u0300re sud), le syste\u0300 ...\" \/>\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\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9couverte d\u2019une exoplan\u00e8te volcanique de la taille de la Terre\" \/>\n<meta property=\"og:description\" content=\"A 90 anne\u0301es-lumie\u0300re de la Terre, dans la petite constellation de la Coupe (visible dans l\u2019he\u0301misphe\u0300re sud), le syste\u0300 ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-26T21:08:41+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-26T22:32:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2023\/05\/sm_1685123828.505908.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\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\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"D\u00e9couverte d\u2019une exoplan\u00e8te volcanique de la taille de la Terre\",\"datePublished\":\"2023-05-26T21:08:41+00:00\",\"dateModified\":\"2023-05-26T22:32:48+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre\"},\"wordCount\":627,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2023\/05\/sm_1685123828.505908.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Senegal\",\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-volcanique-de-la-taille-de-la-terre\",\"name\":\"D\u00e9couverte d\u2019une exoplan\u00e8te volcanique de la taille de la Terre - 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