{"id":10811,"date":"2019-06-06T05:28:24","date_gmt":"2019-06-06T05:28:24","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10811"},"modified":"2019-07-05T04:57:07","modified_gmt":"2019-07-05T04:57:07","slug":"en-haute-provence-un-telescope-traque-les-exoplanetes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/06\/en-haute-provence-un-telescope-traque-les-exoplanetes\/","title":{"rendered":"En Haute-Provence, un t\u00e9lescope traque les exoplan\u00e8tes"},"content":{"rendered":"<p><strong>L&#8217;Observatoire de Haute-Provence continue sa qu\u00eate des exoplan\u00e8tes gr\u00e2ce \u00e0 son spectrographe SOPHIE install\u00e9 sur le t\u00e9lescope de 193 centim\u00e8tres.<\/strong><\/p>\n<h5>Un t\u00e9lescope c\u00e9l\u00e8bre :<\/h5>\n<p>La transparence du ciel de Haute-Provence semble avoir attir\u00e9 les astronomes depuis longtemps. En 1605 un pr\u00e9cepteur belge nomm\u00e9 Wendelin y aurait cr\u00e9\u00e9 le premier site d&#8217;observation au-dessus du village de Lardiers. L&#8217;Observatoire de Haute-Provence (\u00e0 quelques kilom\u00e8tres de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/04\/la-vieille-lune-et-la-chapelle-notre-dame-de-provence\/\" target=\"_blank\" rel=\"noopener noreferrer\">Forcalquier<\/a>) est le seul observatoire en activit\u00e9 dont on peut visiter les installations. C&#8217;est donc avec grand plaisir que je m&#8217;y suis rendu pour d\u00e9couvrir son c\u00e9l\u00e8bre t\u00e9lescope de 193 centim\u00e8tres. Cet instrument, op\u00e9rationnel depuis 1958, \u00e9tait \u00e0 l&#8217;origine dot\u00e9 de trois foyers diff\u00e9rents : Newton (f\/5), Cassegrain (f\/15) et Coud\u00e9 (f\/32), mais seul le foyer Cassegrain est encore utilis\u00e9.<\/p>\n<figure id=\"attachment_10813\" aria-describedby=\"caption-attachment-10813\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp2.jpg\" rel=\"lightbox[10811]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10813\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp2-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp2-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-10813\" class=\"wp-caption-text\">Le t\u00e9lescope de 193 centim\u00e8tres en Haute-Provence. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>L&#8217;instrument a connu son heure de gloire il y a 24 ans. En 1995 il a en effet permis aux astronomes suisses <a href=\"https:\/\/www.franceinter.fr\/emissions\/la-tete-au-carre\/la-tete-au-carre-06-octobre-2015\" target=\"_blank\" rel=\"noopener noreferrer\">Michel Mayor et Didier Queloz<\/a> de d\u00e9tecter la premi\u00e8re plan\u00e8te extrasolaire, <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/planetes-extrasolaires-premiere-fois-on-repere-lumiere-exoplanete-51-pegasi-b-57991\/\" target=\"_blank\" rel=\"noopener noreferrer\">51 Pegasi b<\/a>.\u00a0 <!--more--><\/p>\n<h5>Bienvenue sur 51 Pegasi b :<\/h5>\n<p>C\u2019est le 6 octobre 1995 qu\u2019ils annonc\u00e8rent leur d\u00e9couverte \u00e0 l\u2019occasion de la <em>Ninth Cambridge Workshop on Cool Stars, Stellar Systems and the Sun<\/em> qui se tenait \u00e0 Florence (Italie). Les chercheurs suisses avaient utilis\u00e9 pendant un an le spectrographe <a href=\"http:\/\/www.obs-hp.fr\/nouvelles\/elodie.html\" target=\"_blank\" rel=\"noopener noreferrer\">ELODIE<\/a> pour observer les variations de la vitesse radiale de 51 Pegasi. c&#8217;est une \u00e9toile de type solaire de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener noreferrer\">magnitude<\/a> 5,5 situ\u00e9e \u00e0 un peu plus de 50 ann\u00e9es-lumi\u00e8re dans la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/08\/22\/andromede-pegase\/\" target=\"_blank\" rel=\"noopener noreferrer\">constellation de P\u00e9gase<\/a>. La courbe obtenue r\u00e9v\u00e9la des fluctuations r\u00e9guli\u00e8res d\u2019une p\u00e9riode l\u00e9g\u00e8rement sup\u00e9rieure \u00e0 4 jours. Elles \u00e9taient produites par un objet dont la masse \u00e9tait \u00e9quivalente \u00e0 la moiti\u00e9 de celle de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/05\/02\/spectacle-celeste-saturne-et-jupiter-encadrent-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jupiter<\/a> et qui fut baptis\u00e9 51 Pegasi b.<\/p>\n<figure id=\"attachment_10814\" aria-describedby=\"caption-attachment-10814\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp3.jpg\" rel=\"lightbox[10811]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10814\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp3-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp3-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp3-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp3-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp3.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-10814\" class=\"wp-caption-text\">Une plaque rappelle la d\u00e9couverte de la premi\u00e8re exoplan\u00e8te. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<h5>Apr\u00e8s ELODIE, place \u00e0 SOPHIE :<\/h5>\n<p>Depuis octobre 2006 le spectrographe <a href=\"http:\/\/www.obs-hp.fr\/guide\/sophie\/sophie_infos.shtml\" target=\"_blank\" rel=\"noopener noreferrer\">SOPHIE<\/a> a remplac\u00e9 ELODIE. Plus performant, il est destin\u00e9 \u00e0 d\u00e9tecter des exoplan\u00e8tes dont la taille se rapprocherait de celle de la Terre. Derni\u00e8rement, une \u00e9quipe internationale a d\u00e9couvert \u00e0 l&#8217;aide de cet instrument une super-Terre. D&#8217;une masse trois fois sup\u00e9rieure \u00e0 notre plan\u00e8te, <a href=\"http:\/\/www.obs-hp.fr\/presse\/Communique_GJ411.html\" target=\"_blank\" rel=\"noopener noreferrer\">GJ411b<\/a> tourne en 13 jours autour d&#8217;une \u00e9toile situ\u00e9e \u00e0 8 ann\u00e9es-lumi\u00e8re. Avec ses deux spectrographes, le T193 a permis la d\u00e9tection d&#8217;environ 200 exoplan\u00e8tes depuis 1995.<\/p>\n<figure id=\"attachment_10812\" aria-describedby=\"caption-attachment-10812\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp1.jpg\" rel=\"lightbox[10811]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10812\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp1-450x271.jpg\" alt=\"\" width=\"450\" height=\"271\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp1-450x271.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp1-768x462.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp1-1024x616.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/06\/obshp1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-10812\" class=\"wp-caption-text\">La coupole du T193 au milieu des ch\u00eanes pubescents. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Outre le T193, l&#8217;Observatoire de Haute-Provence dispose de diff\u00e9rentes installations d\u00e9di\u00e9es \u00e0 l&#8217;astronomie, l&#8217;environnement et l&#8217;\u00e9tude de l&#8217;atmosph\u00e8re. C&#8217;est \u00e9galement une zone d&#8217;observation de la biodiversit\u00e9. Une plateforme instrument\u00e9e permet d\u2019\u00e9tudier la for\u00eat de ch\u00eane pubescent pr\u00e9sente sur le site et d&#8217;observer son \u00e9volution sous l\u2019impact du changement climatique.<\/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>L&#8217;Observatoire de Haute-Provence continue sa qu\u00eate des exoplan\u00e8tes gr\u00e2ce \u00e0 son spectrographe SOPHIE install\u00e9 sur le t\u00e9lescope de 193 centim\u00e8tres. Un t\u00e9lescope c\u00e9l\u00e8bre : La transparence du ciel de Haute-Provence semble avoir attir\u00e9 les astronomes depuis longtemps. En 1605 un pr\u00e9cepteur belge nomm\u00e9 Wendelin y aurait cr\u00e9\u00e9 le premier site d&#8217;observation au-dessus du village de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/06\/en-haute-provence-un-telescope-traque-les-exoplanetes\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">En Haute-Provence, un t\u00e9lescope traque les exoplan\u00e8tes<\/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":10812,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[1102,2685,110,2689,2684,2687,2688,2686],"class_list":["post-10811","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-51-pegasi-b","tag-chene-pubescent","tag-exoplanete","tag-gj411b","tag-observatoire-de-haute-provence","tag-spectrographe-elodie","tag-spectrographe-sophie","tag-t193"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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