{"id":17178,"date":"2018-11-21T20:00:08","date_gmt":"2018-11-21T19:00:08","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=17178"},"modified":"2018-11-17T21:26:36","modified_gmt":"2018-11-17T20:26:36","slug":"decouverte-dune-nouvelle-super-terre-tres-proche","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-nouvelle-super-terre-tres-proche\/","title":{"rendered":"D\u00e9couverte d&rsquo;une nouvelle \u00ab\u00a0super-terre\u00a0\u00bb tr\u00e8s proche"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Il s&rsquo;agirait d&rsquo;un monde \u00ab\u00a0froid et obscur\u00a0\u00bb, inhospitalier pour la vie telle que nous la connaissons.<br \/>\nUne \u00ab\u00a0super-terre\u00a0\u00bb a \u00e9t\u00e9 d\u00e9couverte en orbite autour d&rsquo;une \u00e9toile \u00ab\u00a0voisine\u00a0\u00bb du syst\u00e8me solaire : un monde \u00ab\u00a0froid et obscur\u00a0\u00bb, inhospitalier pour la vie telle que nous la connaissons, selon une \u00e9tude publi\u00e9e mercredi dans la revue Nature.<\/p>\n<p>Cette petite derni\u00e8re, baptis\u00e9e Etoile b de Barnard, a \u00e9t\u00e9 d\u00e9busqu\u00e9e dans la constellation d&rsquo;Ophiucus, autour de l&rsquo;\u00e9toile de Barnard distante de quelque 6 ann\u00e9es-lumi\u00e8re de la Terre (une ann\u00e9e lumi\u00e8re \u00e9quivaut \u00e0 9460 milliards de kilom\u00e8tres).<\/p>\n<p>\u00ab\u00a0Notre voisine\u00a0\u00bb<br \/>\n\u00ab\u00a0C&rsquo;est vraiment notre voisine et nous aimons, d&rsquo;une fa\u00e7on g\u00e9n\u00e9rale, rencontrer nos voisins\u00a0\u00bb, a d\u00e9clar\u00e9 Ignasi Ribas, de l&rsquo;Institut d&rsquo;\u00e9tudes spatiales de Catalogne et l&rsquo;Institut espagnol des Sciences de l&rsquo;Espace (ICE-CSIC), coauteur de l&rsquo;\u00e9tude.<\/p>\n<p>Cette proximit\u00e9 fait poindre l&rsquo;espoir de l&rsquo;\u00e9tudier prochainement avec l&rsquo;arriv\u00e9e de nouveaux instruments d&rsquo;observation plus performant. D\u00e9tect\u00e9e gr\u00e2ce aux spectrographes HARPS et UVES, des chasseurs de plan\u00e8tes de l&rsquo;Observatoire europ\u00e9en austral (ESO) install\u00e9 au Chili, elle orbite autour de son \u00e9toile en 233 jours.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"17179\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-nouvelle-super-terre-tres-proche\/etoile-de-barnard\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/%C3%A9toile-de-Barnard.jpg?fit=350%2C210&amp;ssl=1\" data-orig-size=\"350,210\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"\u00e9toile de Barnard\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/%C3%A9toile-de-Barnard.jpg?fit=350%2C210&amp;ssl=1\" class=\"size-full wp-image-17179 aligncenter\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/%C3%A9toile-de-Barnard.jpg?resize=350%2C210\" alt=\"\" width=\"350\" height=\"210\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/%C3%A9toile-de-Barnard.jpg?w=350&amp;ssl=1 350w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/%C3%A9toile-de-Barnard.jpg?resize=300%2C180&amp;ssl=1 300w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/><\/p>\n<p>3,2 fois la masse de la Terre<br \/>\nSelon les chercheurs, l&rsquo;\u00e9toile b de Barnard a une masse similaire \u00e0 3,2 fois celle de la Terre et prend donc le titre de \u00ab\u00a0super-terre\u00a0\u00bb (comme toutes les exoplan\u00e8tes ayant une masse comprise entre 1 et 10 fois celle de la Terre). Pour les astronomes il s&rsquo;agit d&rsquo;un \u00ab\u00a0monde froid et obscur\u00a0\u00bb : la super-terre n&rsquo;est que faiblement \u00e9clair\u00e9e par son \u00e9toile, une naine rouge probablement deux fois plus vieille que le Soleil.<\/p>\n<p>M\u00eame si elle est proche de son \u00e9toile (0,4 fois la distance qui s\u00e9pare la Terre du Soleil), elle ne recevrait que 2% de l&rsquo;\u00e9nergie que la Terre re\u00e7oit du Soleil. Sa temp\u00e9rature de surface ne d\u00e9passerait pas les -170\u00b0C, ce qui exclut d&rsquo;y trouver de l&rsquo;eau \u00e0 l&rsquo;\u00e9tat liquide et donc la vie telle que nous la connaissons.<\/p>\n<p>source : <a href=\"https:\/\/www.lexpress.fr\/actualite\/sciences\/decouverte-d-une-nouvelle-super-terre-pas-si-loin-de-nous_2048675.html?fbclid=IwAR0Tu_FQSPlKvE1RpJQHfPsvudqa1AJzVPlptRj-tw_B9wk42Ak0iWJbo5Y\" target=\"_blank\" rel=\"noopener\">https:\/\/www.lexpress.fr\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"17178\">(506)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Il s&rsquo;agirait d&rsquo;un monde \u00ab\u00a0froid et obscur\u00a0\u00bb, inhospitalier pour la vie telle que nous la connaissons. Une \u00ab\u00a0super-terre\u00a0\u00bb a \u00e9t\u00e9&#8230;<\/p>\n","protected":false},"author":1,"featured_media":17180,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"D\u00e9couverte d'une nouvelle \"super-terre\" tr\u00e8s proche @laterredufutur","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[22],"tags":[6810,6809,359,1948,1705],"class_list":["post-17178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-constellation-dophiucus","tag-etoile-b-de-barnard","tag-exoplanete","tag-extrasolaire","tag-super-terre","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2018\/11\/%C3%A9toile-de-Barnard-planete.jpg?fit=2000%2C1125&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-4t4","jetpack-related-posts":[{"id":24400,"url":"https:\/\/www.laterredufutur.com\/accueil\/deux-super-terres-rocheuses-decouvertes-autour-dune-etoile-proche-et-lune-pourrait-etre-habitable\/","url_meta":{"origin":17178,"position":0},"title":"Deux super-terres rocheuses d\u00e9couvertes autour d&rsquo;une \u00e9toile proche, et l&rsquo;une pourrait \u00eatre habitable","author":"Admin","date":"10 septembre 2022","format":false,"excerpt":"Une \u00e9toile naine rouge situ\u00e9e \u00e0 seulement 105 ann\u00e9es-lumi\u00e8re pourrait abriter au moins un monde habitable. En orbite proche de l'\u00e9toile froide et peu lumineuse, les scientifiques ont d\u00e9couvert et confirm\u00e9 la pr\u00e9sence de deux exoplan\u00e8tes rocheuses, dont l'une se trouve confortablement install\u00e9e \u00e0 une distance de l'\u00e9toile connue sous\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/09\/exoplanetes.jpg?fit=1024%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/09\/exoplanetes.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/09\/exoplanetes.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/09\/exoplanetes.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":23748,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-autre-planete-decouverte-en-orbite-autour-de-proxima-du-centaure\/","url_meta":{"origin":17178,"position":1},"title":"Une autre plan\u00e8te d\u00e9couverte en orbite autour de Proxima du Centaure","author":"Admin","date":"14 f\u00e9vrier 2022","format":false,"excerpt":"Une troisi\u00e8me exoplan\u00e8te a \u00e9t\u00e9 d\u00e9couverte autour de l'\u00e9toile la plus proche du Soleil, la naine rouge Proxima Centauri. Le syst\u00e8me triple d'Alpha du Centaure fait r\u00eaver les exobiologistes et, en particulier, les auteurs de science-fiction depuis longtemps. Non seulement parce qu'il s'agit des \u00e9toiles les plus proches du Soleil\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/02\/Proxima-Centauri.jpg?fit=1024%2C665&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/02\/Proxima-Centauri.jpg?fit=1024%2C665&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/02\/Proxima-Centauri.jpg?fit=1024%2C665&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/02\/Proxima-Centauri.jpg?fit=1024%2C665&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":25354,"url":"https:\/\/www.laterredufutur.com\/accueil\/y-a-t-il-de-la-vie-sur-la-superterre-k2-18-b-de-leau-decouverte-dans-son-atmosphere\/","url_meta":{"origin":17178,"position":2},"title":"Y a-t-il de la vie sur la superterre K2-18 b ? De l&rsquo;eau d\u00e9couverte dans son atmosph\u00e8re !","author":"Admin","date":"10 novembre 2023","format":false,"excerpt":"De la vapeur d'eau a \u00e9t\u00e9 d\u00e9couverte dans l'atmosph\u00e8re d'une exoplan\u00e8te super-Terre, K2-18 b, qui orbite dans la zone habitable de son \u00e9toile. La temp\u00e9rature de la plan\u00e8te est similaire \u00e0 celle de la Terre, ce qui en fait un candidat prometteur pour des \u00e9tudes plus approfondies. K2-18 b a\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/11\/K2-18-b-exoplanete.jpg?fit=1200%2C466&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":7910,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-exoplanete-decouverte-dans-la-proche-banlieue-de-la-terre\/","url_meta":{"origin":17178,"position":3},"title":"Une exoplan\u00e8te d\u00e9couverte dans la proche banlieue de la Terre","author":"Admin","date":"7 septembre 2015","format":false,"excerpt":"Des astronomes ont d\u00e9couvert la plan\u00e8te tellurique la plus proche connue en dehors de notre syst\u00e8me solaire, a confirm\u00e9 jeudi 30 juillet l\u2019universit\u00e9 de Li\u00e8ge, en Belgique. Situ\u00e9e \u00e0 21 ann\u00e9es-\u00adlumi\u00e8re de la Terre, soit \u00abun jet de pierre \u00e0 l\u2019\u00e9chelle de la galaxie\u00bb, cette exoplan\u00e8te pourrait \u00eatre \u00abune mine\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/08\/exoplanete-HD219134b.jpg?fit=620%2C349&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/08\/exoplanete-HD219134b.jpg?fit=620%2C349&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/08\/exoplanete-HD219134b.jpg?fit=620%2C349&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":25249,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-james-webb-decouvre-du-methane-et-du-dioxyde-de-carbone-dans-latmosphere-de-k2-18-b\/","url_meta":{"origin":17178,"position":4},"title":"Le t\u00e9lescope James Webb d\u00e9couvre du m\u00e9thane et du dioxyde de carbone dans l&rsquo;atmosph\u00e8re de K2-18 b","author":"Admin","date":"27 septembre 2023","format":false,"excerpt":"Une nouvelle observation de K2-18 b, une exoplan\u00e8te 8,6 fois plus massive que la Terre, par le t\u00e9lescope spatial James Webb de la NASA a r\u00e9v\u00e9l\u00e9 la pr\u00e9sence de mol\u00e9cules contenant du carbone, notamment du m\u00e9thane et du dioxyde de carbone. La d\u00e9couverte de M. Webb vient s'ajouter \u00e0 de\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":15092,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-nouvelle-exoplanete-pourrait-etre-la-meilleure-candidate-pour-la-recherche-de-traces-de-vie\/","url_meta":{"origin":17178,"position":5},"title":"Une nouvelle exoplan\u00e8te pourrait \u00eatre la meilleure candidate pour la recherche de traces de vie","author":"Admin","date":"23 avril 2017","format":false,"excerpt":"Une exoplan\u00e8te en orbite autour d'une \u00e9toile de type naine rouge situ\u00e9e \u00e0 40 ann\u00e9es lumi\u00e8re de la Terre pourrait bien remporter \u00e0 son tour le titre de \"meilleure candidate pour la recherche de traces de vie au-del\u00e0 du Syst\u00e8me Solaire\". Une \u00e9quipe internationale d'astronomes compos\u00e9e de scientifiques de l'Institut\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/04\/exoplanete.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/04\/exoplanete.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/04\/exoplanete.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/04\/exoplanete.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/04\/exoplanete.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/17178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=17178"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/17178\/revisions"}],"predecessor-version":[{"id":17181,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/17178\/revisions\/17181"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/17180"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=17178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=17178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=17178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}