{"id":4716,"date":"2016-01-23T08:41:07","date_gmt":"2016-01-23T08:41:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4716"},"modified":"2016-01-28T05:14:16","modified_gmt":"2016-01-28T05:14:16","slug":"le-nouveau-visage-du-systeme-stellaire-alpha-centauri","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/23\/le-nouveau-visage-du-systeme-stellaire-alpha-centauri\/","title":{"rendered":"Le nouveau visage du syst\u00e8me stellaire Alpha Centauri"},"content":{"rendered":"<p><strong>En compilant une \u00e9norme quantit\u00e9 d&#8217;observations, deux astronomes belges viennent de d\u00e9poussi\u00e9rer le portrait du syst\u00e8me stellaire <em>Alpha Centauri<\/em>. \u00a0<\/strong><\/p>\n<p><em>Alpha Centauri<\/em> est l&#8217;astre le plus brillant de la constellation australe du Centaure. Il s&#8217;agit en r\u00e9alit\u00e9 d&#8217;un syst\u00e8me stellaire triple compos\u00e9 de deux \u00e9toiles proches l&#8217;une de l&#8217;autre (<i>les composantes<\/i>\u00a0A et B \u00e0 4,36 ann\u00e9es-lumi\u00e8re de nous) et d&#8217;une troisi\u00e8me,<em> Alpha Centauri<\/em> C \u00e0 4,22 ann\u00e9es-lumi\u00e8re (l&#8217;\u00e9toile la plus proche du Syst\u00e8me solaire).<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" frameborder=\"0\" width=\"480\" height=\"270\" src=\"\/\/www.dailymotion.com\/embed\/video\/x38yxc3\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: center\"><strong>En vid\u00e9o : les 10 plus grandes d\u00e9couvertes des t\u00e9lescopes de l&#8217;ESO<\/strong><\/p>\n<p><em>Alpha Centauri<\/em> A est une \u00e9toile tr\u00e8s semblable au <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/15\/dans-la-mer-le-soleil-est-encore-plus-beau\/\" target=\"_blank\">Soleil <\/a>avec un type spectral G2. Sa voisine B\u00a0(de type K1) est juste un peu moins lumineuse que notre \u00e9toile. Quant \u00e0 <em>Alpha Centauri<\/em> C il s&#8217;agit d&#8217;une naine rouge beaucoup plus discr\u00e8te que ses 2 voisines, mais qui doit sa c\u00e9l\u00e9brit\u00e9 \u00e0 sa distance puisqu&#8217;il s&#8217;agit de l&#8217;\u00e9toile la plus proche, mieux connue sous le nom de <em><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/14\/decouverte-de-letoile-proxima-centauri-il-y-a-un-siecle\/\" target=\"_blank\">Proxima Centauri<\/a><\/em>.<\/p>\n<p><!--more-->Les astronomes pensent \u00a0qu&#8217;une exoplan\u00e8te (<a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/exoplanetes-alpha-centauri-bb-y-t-il-superterre-43-annees-lumiere-57481\/\" target=\"_blank\"><em>Alpha Centauri<\/em> Bb<\/a>) tourne en 3,2 jours autour de <em>Alpha Centauri<\/em> B \u00e0 une distance de seulement 6 millions de km.\u00a0\u00a0Avec une masse comprise entre 1,1 et 2,7 masses terrestres\u00a0<em>Alpha Centauri<\/em> Bb peut se classer dans \u00a0la cat\u00e9gorie des superterres, mais ne nous y trompons pas : la proximit\u00e9 de son \u00e9toile en fait un monde infernal.<\/p>\n<p>Deux chercheurs belges, Dimitri Pourbaix de l&#8217;<a href=\"http:\/\/www-astro.ulb.ac.be\/\" target=\"_blank\">ULB<\/a> (Universit\u00e9 libre de Bruxelles) et Henri Boffin de l&#8217;<a href=\"https:\/\/www.eso.org\/public\/france\/\" target=\"_blank\">ESO<\/a> (l&#8217;Observatoire Europ\u00e9en Austral), viennent de redessiner le nouveau visage d&#8217;Alpha Centauri&#8230; sans instrument.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4718\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/alpha2-450x316.jpg\" alt=\"alpha2\" width=\"450\" height=\"316\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/alpha2-450x316.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/alpha2-768x540.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/alpha2-1024x720.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/01\/alpha2.jpg 1280w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/p>\n<p>Il leur aura suffit (si l&#8217;on peut dire !) de compiler 11 ann\u00e9es de donn\u00e9es obtenues \u00e0 l&#8217;aide du spectrographe chasseur d&#8217;exoplan\u00e8tes <a href=\"https:\/\/www.eso.org\/sci\/facilities\/lasilla\/instruments\/harps.html\" target=\"_blank\">HARPS <\/a>(<em>High Accuracy Radial velocity Planet Searcher<\/em>) de l&#8217;ESO ainsi que les relev\u00e9s de positions du syst\u00e8me stellaire <em>Alpha Centauri<\/em> enregistr\u00e9s pendant 260 ans et archiv\u00e9s par l&#8217;<em><a href=\"http:\/\/www.usno.navy.mil\/USNO\" target=\"_blank\">U.\u00a0S. Naval Observatory<\/a><\/em>.<\/p>\n<p>Publi\u00e9 sur <a href=\"http:\/\/arxiv.org\/pdf\/1601.01636v1.pdf\" target=\"_blank\">Arxiv<\/a>, le r\u00e9sultat de leur recherche devrait permettre d&#8217;affiner les orbites du trio d&#8217;\u00e9toiles et de pr\u00e9ciser ou non l&#8217;existence d&#8217;\u00e9ventuelles exoplan\u00e8tes gravitant autour de ces astres.<\/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>En compilant une \u00e9norme quantit\u00e9 d&#8217;observations, deux astronomes belges viennent de d\u00e9poussi\u00e9rer le portrait du syst\u00e8me stellaire Alpha Centauri. \u00a0 Alpha Centauri est l&#8217;astre le plus brillant de la constellation australe du Centaure. Il s&#8217;agit en r\u00e9alit\u00e9 d&#8217;un syst\u00e8me stellaire triple compos\u00e9 de deux \u00e9toiles proches l&#8217;une de l&#8217;autre (les composantes\u00a0A et B \u00e0 4,36 &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/23\/le-nouveau-visage-du-systeme-stellaire-alpha-centauri\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Le nouveau visage du syst\u00e8me stellaire Alpha Centauri<\/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":4717,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1014,1170,1453,633,1451,1454,1452],"class_list":["post-4716","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-alpha-centauri","tag-constellation-du-centaure","tag-dimitri-pourbaix","tag-eso","tag-harps","tag-henri-boffin","tag-ulb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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