{"id":185706,"date":"2020-01-08T23:01:39","date_gmt":"2020-01-08T23:01:39","guid":{"rendered":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/?p=185706"},"modified":"2020-01-08T23:01:42","modified_gmt":"2020-01-08T23:01:42","slug":"toi-700d-une-planete-de-la-taille-de-la-terre-decouverte-dans-une-zone-habitable","status":"publish","type":"post","link":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/toi-700d-une-planete-de-la-taille-de-la-terre-decouverte-dans-une-zone-habitable\/","title":{"rendered":"TOI 700d : une plan\u00e8te de la taille de la Terre d\u00e9couverte dans une \u00ab\u00a0zone habitable\u00a0\u00bb"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>L&rsquo;agence spatiale am\u00e9ricaine, la NASA a annonc\u00e9 avoir d\u00e9couvert gr\u00e2ce \u00e0 son satellite TESS (Transiting Exoplanet Survey Satellite) , une nouvelle plan\u00e8te situ\u00e9e \u00e0 cent ann\u00e9es-lumi\u00e8re de la Terre.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> La nouvelle plan\u00e8te \u00ab\u00a0habitable\u00a0\u00bb relativement proche de la Terre baptis\u00e9e \u00ab\u00a0TOI 700 d\u00a0\u00bb par la Nasa pourrait abriter la vie. Elle  aurait des caract\u00e9ristiques similaires \u00e0 celle de la Terre. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>\u00ab\u00a0TESS a \u00e9t\u00e9 con\u00e7u et lanc\u00e9 sp\u00e9cifiquement pour trouver des plan\u00e8tes de la taille de la Terre et en orbite autour d&rsquo;\u00e9toiles proches\u00a0\u00bb<\/em>, explique Paul Hertz, directeur de la division d&rsquo;astrophysique de la Nasa.  TESS\u00a0 est le satelite qui l&rsquo;a d\u00e9couverte. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\n\nLa National Aeronautics and Space Administration, connue sous son acronyme NASA, est l&rsquo;agence gouvernementale qui est responsable de la majeure partie du programme spatial civil des \u00c9tats-Unis. &nbsp; \n\n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TESS a initialement mal class\u00e9 l&rsquo;\u00e9toile, ce qui signifie que les plan\u00e8tes sont apparues plus grandes et plus chaudes qu&rsquo;elles ne le sont en r\u00e9alit\u00e9. Mais plusieurs astronomes amateurs, dont le lyc\u00e9en Alton Spencer &#8211; qui travaille avec des membres de l&rsquo;\u00e9quipe TESS &#8211; ont identifi\u00e9 l&rsquo;erreur.<br>\n\u00ab\u00a0Lorsque nous avons corrig\u00e9 les param\u00e8tres de l&rsquo;\u00e9toile, la taille de ses plan\u00e8tes a chut\u00e9, et nous avons r\u00e9alis\u00e9 que la plus externe \u00e9tait de la taille de la Terre et dans la zone habitable\u00a0\u00bb, a d\u00e9clar\u00e9 Emily Gilbert, \u00e9tudiante dipl\u00f4m\u00e9e de l&rsquo;Universit\u00e9 de Chicago.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La d\u00e9couverte a \u00e9t\u00e9 confirm\u00e9e plus tard par le t\u00e9lescope spatial Spitzer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zone habitable<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quelques autres plan\u00e8tes similaires ont \u00e9t\u00e9 d\u00e9couvertes auparavant, notamment par l&rsquo;ancien t\u00e9lescope spatial Kepler, mais c&rsquo;est la premi\u00e8re d\u00e9couverte par TESS, qui a \u00e9t\u00e9 lanc\u00e9e en 2018.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TESS se stabilise sur une zone du ciel pour d\u00e9tecter si des objets &#8211; des plan\u00e8tes &#8211; passent devant les \u00e9toiles, ce qui provoque une baisse temporaire de la luminosit\u00e9 des \u00e9toiles. Cela permet \u00e0 TESS de d\u00e9duire la pr\u00e9sence d&rsquo;une plan\u00e8te, sa taille et son orbite.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;\u00e9toile TOI 700 est petite, environ 40% de la taille du Soleil de la Terre et seulement environ la moiti\u00e9 aussi chaude.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TESS a d\u00e9couvert trois plan\u00e8tes en orbite, nomm\u00e9es TOI 700 b, c et d. Seul \u00abd\u00bb se trouve dans la zone dite habitable, pas trop loin et pas trop pr\u00e8s de l&rsquo;\u00e9toile, o\u00f9 la temp\u00e9rature pourrait permettre la pr\u00e9sence d&rsquo;eau liquide.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il est environ 20% plus grand que la Terre et orbite autour de son \u00e9toile en 37 jours. La plan\u00e8te 700 d re\u00e7oit 86% de l&rsquo;\u00e9nergie que la Terre re\u00e7oit du Soleil.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Reste \u00e0 savoir de quoi est fait le 700 d. Les chercheurs ont g\u00e9n\u00e9r\u00e9 des mod\u00e8les bas\u00e9s sur la taille et le type d&rsquo;\u00e9toile afin de pr\u00e9dire la composition atmosph\u00e9rique et la temp\u00e9rature de surface de 700 s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans une simulation, a expliqu\u00e9 la NASA, la plan\u00e8te est recouverte d&rsquo;oc\u00e9ans avec \u00abune atmosph\u00e8re dense, domin\u00e9e par le dioxyde de carbone, similaire \u00e0 ce que les scientifiques soup\u00e7onnaient chez Mars lorsqu&rsquo;elle \u00e9tait jeune\u00bb.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;agence spatiale am\u00e9ricaine, la NASA a annonc\u00e9 avoir d\u00e9couvert gr\u00e2ce \u00e0 son satellite TESS (Transiting Exoplanet Survey Satellite) , une nouvelle plan\u00e8te situ\u00e9e \u00e0 cent ann\u00e9es-lumi\u00e8re de la Terre. La nouvelle plan\u00e8te \u00ab\u00a0habitable\u00a0\u00bb relativement proche de la Terre baptis\u00e9e \u00ab\u00a0TOI 700 d\u00a0\u00bb par la Nasa pourrait abriter la vie. Elle aurait des caract\u00e9ristiques similaires \u00e0 &hellip;<\/p>\n","protected":false},"author":37,"featured_media":185707,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7220],"tags":[6530,5704,159134],"class_list":["post-185706","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-nasa","tag-planete","tag-toi-700d"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>TOI 700d : une plan\u00e8te de la taille de la Terre d\u00e9couverte dans une &quot;zone habitable&quot;<\/title>\n<meta name=\"description\" content=\"La NASA a annonc\u00e9 que son satellite chasseur de plan\u00e8tes TESS a d\u00e9couvert un monde de la taille de la Terre \u00e0 port\u00e9e de son \u00e9toile\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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