{"id":17077,"date":"2023-01-06T17:25:47","date_gmt":"2023-01-06T17:25:47","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=17077"},"modified":"2023-01-16T17:59:16","modified_gmt":"2023-01-16T17:59:16","slug":"j1407b-une-super-saturne-entouree-dimmenses-anneaux","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/06\/j1407b-une-super-saturne-entouree-dimmenses-anneaux\/","title":{"rendered":"J1407b, une Super Saturne entour\u00e9e d&#8217;immenses anneaux"},"content":{"rendered":"<p style=\"text-align: left\"><strong>Les astronomes ont d\u00e9nich\u00e9 une Saturne g\u00e9ante aux anneaux d\u00e9mesur\u00e9s situ\u00e9e \u00e0 plus de 400 ann\u00e9es-lumi\u00e8re de la Terre, J1407b.<\/strong><\/p>\n<h5>Le v\u00e9ritable Seigneur des anneaux :<\/h5>\n<p>\u00c0 c\u00f4t\u00e9 de J1407b, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/17\/saturne-la-planete-qui-fait-naitre-des-vocations\/\" target=\"_blank\" rel=\"noopener\">Saturne<\/a> semble bien ch\u00e9tive. Et pour cause : cette exoplan\u00e8te (\u00e0 moins qu&#8217;il ne s&#8217;agisse d&#8217;une <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-naine-brune-49\/\" target=\"_blank\" rel=\"noopener\">naine brune<\/a>) est entour\u00e9e d&#8217;anneaux gigantesques. Il y en aurait plus d&#8217;une trentaine dont la constitution est comparable \u00e0 ceux de Saturne (des blocs de plusieurs m\u00e8tres jusqu&#8217;aux grains de poussi\u00e8re). Mais c&#8217;est leur taille qui impressionne :\u00a0 ils sont deux cent fois plus grands ! Cet astre bien particulier se situe \u00e0 430 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a> de la Terre dans la constellation australe du Centaure, c\u00e9l\u00e8bre pour h\u00e9berger <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/12\/02\/omega-du-centaure-nest-sans-doute-pas-un-amas-globulaire\/\" target=\"_blank\" rel=\"noopener\">Om\u00e9ga du Centaure<\/a> :<\/p>\n<figure id=\"attachment_17078\" aria-describedby=\"caption-attachment-17078\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/J1407b.jpg\" rel=\"lightbox[17077]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-17078\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/J1407b-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/J1407b-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/J1407b-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/J1407b-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/12\/J1407b.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-17078\" class=\"wp-caption-text\">Vue d&#8217;artiste de l&#8217;exoplan\u00e8te (ou de la naine brune) J1407b. On aper\u00e7oit en arri\u00e8re plan en haut \u00e0 gauche l&#8217;\u00e9toile J1407 occult\u00e9e par les anneaux. La pr\u00e9sence de Saturne donne une id\u00e9e de la diff\u00e9rence de taille entre les deux syst\u00e8mes d&#8217;anneaux. \u00a9 Ron Miller<\/figcaption><\/figure>\n<p>Si l&#8217;on pouvait ramener J1407b dans le Syst\u00e8me solaire, ses anneaux s&#8217;\u00e9tendraient sur une surface \u00e9quivalente \u00e0 plusieurs fois celle de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/12\/08\/en-images-loccultation-de-la-planete-mars-par-la-pleine-lune\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a>. Et leur \u00e9clat les rendrait parfaitement visibles la nuit !<!--more--><\/p>\n<h5>D\u00e9couverte fortuite :<\/h5>\n<p>En 2011, <a href=\"https:\/\/www.researchgate.net\/profile\/Mark-Pecaut-2\" target=\"_blank\" rel=\"noopener\">Mark Pecaut<\/a>, qui travaille dans une \u00e9quipe dirig\u00e9e par <a href=\"https:\/\/science.jpl.nasa.gov\/people\/mamajek\/\" target=\"_blank\" rel=\"noopener\">Eric Mamajek<\/a>, fait une \u00e9trange d\u00e9couverte. Alors qu&#8217;il \u00e9tudie des donn\u00e9es de <a href=\"https:\/\/www.superwasp.org\/\" target=\"_blank\" rel=\"noopener\"><em>SuperWAPS<\/em><\/a>, un programme de recherche d&#8217;exoplan\u00e8tes, il remarque que l&#8217;\u00e9toile J1407 pr\u00e9sente une courbe de lumi\u00e8re tr\u00e8s particuli\u00e8re. L&#8217;\u00e9clat de cet astre semble avoir fluctu\u00e9 pendant deux mois de fa\u00e7on totalement anarchique. Des variations qui pouvaient durer de quelques dizaines de minutes \u00e0 plusieurs heures. Les astronomes comprennent alors que l&#8217;\u00e9toile J1407 a \u00e9t\u00e9 \u00e9clips\u00e9e par un syst\u00e8me d&#8217;anneaux. Avec les donn\u00e9es recueillies, <a href=\"https:\/\/kenworthy.space\/\" target=\"_blank\" rel=\"noopener\">Matthew Kenworthy<\/a> a r\u00e9alis\u00e9 l&#8217;animation ci-dessous :<\/p>\n<p><iframe loading=\"lazy\" title=\"Exoring model for J1407b\" src=\"https:\/\/player.vimeo.com\/video\/117757625?dnt=1&amp;app_id=122963\" width=\"474\" height=\"332\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n<p>La Super Saturne au centre de ce syst\u00e8me d&#8217;anneaux n&#8217;a pas encore pu \u00eatre observ\u00e9e. Mais les astronomes pensent qu&#8217;ils sont en pr\u00e9sence d&#8217;une jeune exoplan\u00e8te g\u00e9ante dont les anneaux pr\u00e9c\u00e8dent la formation de lunes. Un stade juv\u00e9nile d\u00e9j\u00e0 imagin\u00e9 pour expliquer les multiples satellites qui orbitent autour de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/11\/03\/02-novembre-2022-en-photo-ou-en-dessin-jupiter-fait-son-show\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a> et Saturne. Mais pour en savoir plus, il faudra surveiller r\u00e9guli\u00e8rement J1407 pour \u00e9tudier son prochain passage derri\u00e8re ce syst\u00e8me d&#8217;anneaux. Pour en savoir plus : <a href=\"https:\/\/www.rochester.edu\/newscenter\/gigantic-ring-system-around-j1407b\/\" target=\"_blank\" rel=\"noopener\"><em>Gigantic ring system around J1407b much larger, heavier than Saturn\u2019s<\/em><\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/06\/en-haute-provence-un-telescope-traque-les-exoplanetes\/\" target=\"_blank\" rel=\"noopener\">En Haute-Provence, un t\u00e9lescope traque les exoplan\u00e8tes<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/13\/en-video-linstrument-sphere-traque-les-exoplanetes\/\" target=\"_blank\" rel=\"noopener\">En vid\u00e9o : l\u2019instrument SPHERE cherche les exoplan\u00e8tes<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/01\/ngts-un-reseau-de-telescopes-pour-traquer-les-exoplanetes\/\" target=\"_blank\" rel=\"noopener\">NGTS, un r\u00e9seau de t\u00e9lescopes pour d\u00e9busquer les exoplan\u00e8tes<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>.<\/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>Les astronomes ont d\u00e9nich\u00e9 une Saturne g\u00e9ante aux anneaux d\u00e9mesur\u00e9s situ\u00e9e \u00e0 plus de 400 ann\u00e9es-lumi\u00e8re de la Terre, J1407b. Le v\u00e9ritable Seigneur des anneaux : \u00c0 c\u00f4t\u00e9 de J1407b, Saturne semble bien ch\u00e9tive. Et pour cause : cette exoplan\u00e8te (\u00e0 moins qu&#8217;il ne s&#8217;agisse d&#8217;une naine brune) est entour\u00e9e d&#8217;anneaux gigantesques. Il y en &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/06\/j1407b-une-super-saturne-entouree-dimmenses-anneaux\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">J1407b, une Super Saturne entour\u00e9e d&#8217;immenses anneaux<\/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":17078,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1170,2201,3330,3331,3333,136,3332],"class_list":["post-17077","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-constellation-du-centaure","tag-eric-mamajek","tag-j1407b","tag-mark-pecaut","tag-matthew-kenworthy","tag-saturne","tag-superwaps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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