{"id":930794,"date":"2020-04-21T17:30:08","date_gmt":"2020-04-21T15:30:08","guid":{"rendered":"https:\/\/www.tomsguide.fr\/?p=930794"},"modified":"2023-12-09T00:19:12","modified_gmt":"2023-12-08T23:19:12","slug":"decouverte-en-2008-la-pretendue-planete-fomalhaut-b-a-disparu-dans-une-collision","status":"publish","type":"post","link":"https:\/\/www.tomsguide.fr\/decouverte-en-2008-la-pretendue-planete-fomalhaut-b-a-disparu-dans-une-collision\/","title":{"rendered":"D\u00e9couverte en 2008, la pr\u00e9tendue plan\u00e8te Fomalhaut b a disparu dans une collision"},"content":{"rendered":"\n

Le voyage dans le temps est possible, dans le pass\u00e9 tout du moins. Les astronomes de l\u2019Universit\u00e9 d\u2019Arizona viennent d\u2019en faire l\u2019exp\u00e9rience en comprenant que l\u2019une des toutes premi\u00e8res exoplan\u00e8tes<\/strong> identifi\u00e9es avait d\u00e9j\u00e0 disparu au moment de sa d\u00e9couverte. Situ\u00e9e \u00e0 environ 25 ann\u00e9es-lumi\u00e8re, Formalhaut b a \u00e9t\u00e9 rep\u00e9r\u00e9 pour la premi\u00e8re fois en 2008 \u00e0 partir des donn\u00e9es recueillies entre 2004 et 2006. Les derni\u00e8res observations du t\u00e9lescope spatial Hubble montrent qu\u2019\u00e0 cette date, elle n\u2019existait d\u00e9j\u00e0 plus depuis bien longtemps.<\/p>\n\n\n\n

\"Image
Cr\u00e9dit: ESA, NASA and M. Kornmesser<\/figcaption><\/figure>\n\n\n\n

La NASA et l\u2019ESA ont un plan pour rapporter des \u00e9chantillons de Mars sur Terre<\/strong><\/p>\n\n\n\n

D\u00e8s sa d\u00e9couverte, Formalhaut b suscitait d\u00e9j\u00e0 la curiosit\u00e9 des astronomes. Contrairement aux autres exoplan\u00e8tes, elle \u00e9met de la lumi\u00e8re dans le domaine du visible, et n\u2019a aucune signature thermique dans l\u2019infrarouge. Habituellement, une plan\u00e8te est beaucoup trop petite pour r\u00e9fl\u00e9chir autant de lumi\u00e8re visible de son \u00e9toile, mais sa chaleur devrait produire un rayonnement infrarouge. Les astronomes ont alors avanc\u00e9 que son \u00e9clat provenait probablement d\u2019un immense nuage de poussi\u00e8re englobant. Une hypoth\u00e8se qui se r\u00e9v\u00e8le assez proche de la r\u00e9alit\u00e9 puisqu\u2019ils ont enfin d\u00e9couvert qu\u2019ils n\u2019ont jamais observ\u00e9 de plan\u00e8te, mais les r\u00e9sidus d\u2019une collision entre deux ast\u00e9ro\u00efdes glac\u00e9s<\/strong>.<\/p>\n\n\n\n

Hubble rate de peu une une collision gigantesque entre deux ast\u00e9ro\u00efdes glac\u00e9s de 200 km<\/h2>\n\n\n\n

Les observations d\u2019Hubble depuis sa d\u00e9couverte confirment l\u2019hypoth\u00e8se d\u2019une collision qui a du se produire tr\u00e8s peu de temps avant la d\u00e9couverte de Fomalhaut b. Si au d\u00e9part le nuage de poussi\u00e8re issu de la collision a pu induire les astronomes en erreur, il a rapidement adopt\u00e9 une trajectoire de fuite, et il s\u2019est peu \u00e0 peu dissip\u00e9 pour \u00eatre d\u00e9sormais compl\u00e8tement invisible. <\/p>\n\n\n\n

Une \u00e9toile dansant autour d\u2019un trou noir valide la th\u00e9orie de la relativit\u00e9 d\u2019Einstein<\/a><\/strong><\/p>\n\n\n\n

Bien que les scientifiques regrettent d\u2019avoir manqu\u00e9 une collision d\u2019une telle ampleur, l\u2019\u00e9tude de ses cons\u00e9quences a permis de mod\u00e9liser son \u00e9volution jusqu\u2019\u00e0 rejoindre l\u2019anneau de d\u00e9bris glac\u00e9s qui entourent l\u2019\u00e9toile Formalhaut. Une structure comparable \u00e0 la ceinture de Kuiper qui entoure notre syst\u00e8me solaire et dont sont issues la plupart des com\u00e8tes qui le traverse. L\u2019\u00e9tude du syst\u00e8me \u00ab\u2009voisin\u2009\u00bb du n\u00f4tre doit maintenant se poursuivre avec des dispositifs plus puissants pour mieux comprendre son architecture, et peut-\u00eatre d\u00e9couvrir une v\u00e9ritable plan\u00e8te. Les astronomes comptent notamment sur le t\u00e9lescope spatial James Webb qui vient tout juste de d\u00e9ployer son miroir pour la premi\u00e8re fois<\/a>.<\/p>\n\n\n\n

Source : phys.org<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

L\u2019une des premi\u00e8res exoplan\u00e8tes jamais d\u00e9couvertes n\u2019en est finalement pas une. Identifi\u00e9e en 2008, Fomalhaut b a toujours intrigu\u00e9 les astronomes qui constatent d\u00e9sormais qu\u2019elle a compl\u00e8tement disparu aux yeux d\u2019Hubble.<\/p>","protected":false},"author":82,"featured_media":930840,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[494,3872],"tags":[],"hubs":[],"acf":{"display_mode":"medium-img","post_show_excerpt":true,"post_source":"","hide_sidebar":false,"hide_advertising":false},"yoast_head":"\nD\u00e9couverte en 2008, la pr\u00e9tendue plan\u00e8te Fomalhaut b a disparu dans une collision<\/title>\n<meta name=\"description\" content=\"L\u2019une des premi\u00e8res exoplan\u00e8tes jamais d\u00e9couvertes n\u2019en est finalement pas une. 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