{"id":3097,"date":"2015-06-28T05:10:04","date_gmt":"2015-06-28T05:10:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3097"},"modified":"2015-07-07T04:53:12","modified_gmt":"2015-07-07T04:53:12","slug":"gliese-436b-lexoplanete-qui-traine-une-queue-dhydrogene","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/28\/gliese-436b-lexoplanete-qui-traine-une-queue-dhydrogene\/","title":{"rendered":"Gliese 436b, l&#8217;exoplan\u00e8te qui tra\u00eene une queue d&#8217;hydrog\u00e8ne"},"content":{"rendered":"<p><strong>Une \u00e9quipe de scientifiques a d\u00e9couvert que Gliese 436b, une exoplan\u00e8te connue depuis 2004, est accompagn\u00e9e sur son orbite par un immense nuage d&#8217;hydrog\u00e8ne.<\/strong><\/p>\n<p>Gliese 436b est une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/07\/telescope-lohp\/\" target=\"_blank\">plan\u00e8te extrasolaire<\/a> l\u00e9g\u00e8rement plus massive que Neptune qui orbite autour de Gliese 436, une naine rouge situ\u00e9e \u00e0 un peu plus de 33 ann\u00e9es-lumi\u00e8re de nous dans la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/27\/triplet-de-galaxies-dans-la-constellation-du-lion\/\" target=\"_blank\">constellation du Lion<\/a>.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gliese436b.jpg\" rel=\"lightbox[3097]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-3099\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gliese436b-450x253.jpg\" alt=\"gliese436b\" width=\"450\" height=\"253\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gliese436b-450x253.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/06\/gliese436b.jpg 736w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Une \u00e9tude publi\u00e9e dans la revue <a href=\"http:\/\/www.nature.com\/nature\/journal\/v522\/n7557\/full\/nature14501.html\" target=\"_blank\">Nature <\/a>pr\u00e9sente les r\u00e9sultats d&#8217;une \u00e9quipe de chercheurs qui ont observ\u00e9 les transits de Gliese 436b devant son \u00e9toile \u00e0 l&#8217;aide du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/24\/en-video-science-et-poesie-pour-feter-le-telescope-hubble\/\" target=\"_blank\">t\u00e9lescope spatial Hubble<\/a> (l&#8217;exoplan\u00e8te r\u00e9alise une orbite compl\u00e8te en 2 jours et 15,5 heures).<\/p>\n<p><!--more-->Les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">astronomes <\/a>ont constat\u00e9 que les transits duraient plus longtemps dans l&#8217;ultraviolet que dans le visible, preuve que Gliese 436b tra\u00eene derri\u00e8re elle une sorte de queue de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/20\/leau-terrestre-ne-viendrait-pas-des-cometes\/\" target=\"_blank\">com\u00e8te<\/a>, un \u00e9norme nuage principalement compos\u00e9 d&#8217;atomes d&#8217;hydrog\u00e8ne.<\/p>\n<p>L&#8217;exoplan\u00e8te perdrait ainsi chaque seconde entre 100 et 1000 tonnes de gaz, ce qui \u00e9quivaudrait \u00e0 10% de sa masse depuis sa formation.<\/p>\n<p>Comme l&#8217;a rappel\u00e9 David Sing du d\u00e9partement physique et astronomie de\u00a0 l&#8217;<a href=\"http:\/\/www.exeter.ac.uk\/\" target=\"_blank\">Universit\u00e9 d&#8217;Exeter<\/a>, l&#8217;un des auteurs de cette \u00e9tude, ce n&#8217;est pas la premi\u00e8re fois qu&#8217;on observe une tra\u00een\u00e9e de gaz dans le sillage d&#8217;une exoplan\u00e8te, mais c&#8217;est une surprise de d\u00e9couvrir ce ph\u00e9nom\u00e8ne derri\u00e8re un astre aussi petit que Gliese 436b\u00a0: jusqu&#8217;\u00e0 pr\u00e9sent cela ne concernait que des plan\u00e8tes extrasolaires g\u00e9antes.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Une \u00e9quipe de scientifiques a d\u00e9couvert que Gliese 436b, une exoplan\u00e8te connue depuis 2004, est accompagn\u00e9e sur son orbite par un immense nuage d&#8217;hydrog\u00e8ne. Gliese 436b est une plan\u00e8te extrasolaire l\u00e9g\u00e8rement plus massive que Neptune qui orbite autour de Gliese 436, une naine rouge situ\u00e9e \u00e0 un peu plus de 33 ann\u00e9es-lumi\u00e8re de nous dans &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/28\/gliese-436b-lexoplanete-qui-traine-une-queue-dhydrogene\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Gliese 436b, l&#8217;exoplan\u00e8te qui tra\u00eene une queue d&#8217;hydrog\u00e8ne<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":3100,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[372,110,1125,1126,1127],"class_list":["post-3097","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-constellation-du-lion","tag-exoplanete","tag-gliese-436","tag-gliese-436b","tag-planete-extrasolaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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