{"id":74088,"date":"2026-01-02T12:00:00","date_gmt":"2026-01-02T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-dune-exoplanete-en-forme-de-citron"},"modified":"2026-01-02T12:00:00","modified_gmt":"2026-01-02T12:00:00","slug":"decouverte-dune-exoplanete-en-forme-de-citron","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/decouverte-dune-exoplanete-en-forme-de-citron","title":{"rendered":"D\u00e9couverte D\u2019Une Exoplan\u00e8te en Forme de Citron"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span><b>Des scientifiques viennent de de\u0301couvrir une nouvelle exoplane\u0300te gra\u0302ce au te\u0301lescope spatial de la NASA. Elle e\u0301tonne par sa forme, mais aussi par son atmosphe\u0300re riche en carbone.<\/b><\/p>\n<p>Elle brouille les lignes entre plane\u0300te et e\u0301toile. PSR J2322-2650b, c\u2019est son nom, est une nouvelle exoplane\u0300te de\u0301couverte mardi 16 de\u0301cembre par des scientifiques de l\u2019universite\u0301 de Chicago, qui se propulse imme\u0301diatement au rang des objets spatiaux les plus bizarres que l\u2019on connaisse. Sa forme e\u0301trange fait qu\u2019elle est compare\u0301e a\u0300 un citron, mais ce n\u2019est pas son seul signe distinctif.<\/p>\n<p>Michael Zhang et ses colle\u0300gues ont repe\u0301re\u0301 cette dro\u0302le de plane\u0300te, situe\u0301e a\u0300 2.000 anne\u0301es-lumie\u0300re de la Terre, gra\u0302ce au te\u0301lescope spatial James-Webb de la NASA. C\u2019est d\u2019abord son orbite hors du commun qui a suscite\u0301 leur curiosite\u0301: PSR J2322-2650b tourne autour d\u2019une e\u0301toile a\u0300 neutrons en rotation rapide \u2013ce qu\u2019on appelle un pulsar, et si l\u2019on en croit les astronomes, cela est loin d\u2019e\u0302tre habituel&#8230; mais c\u2019est la composition me\u0302me de la plane\u0300te qui les a surpris.<\/p>\n<p>Le spectre lumineux mesure\u0301 n\u2019a pas re\u0301ve\u0301le\u0301 la pre\u0301sence habituelle d\u2019eau et de dioxyde de carbone qu\u2019on retrouve ge\u0301ne\u0301ralement sur une plane\u0300te de la taille de Jupiter comme celle-ci. A\u0300 la place, les chercheurs ont de\u0301tecte\u0301 des mole\u0301cules de carbone, du jamais vu dans l\u2019atmosphe\u0300re d\u2019une exoplane\u0300te.<\/p>\n<p>Le carbone dans ce contexte a en effet tendance a\u0300 se lier a\u0300 d\u2019autres atomes pluto\u0302t qu\u2019a\u0300 lui-me\u0302me: \u00abPour avoir du carbone mole\u0301culaire dans l\u2019atmosphe\u0300re, vous devez vous de\u0301barrasser de tout le reste, vulgarise Michael Zhang aupre\u0300s de New Scientist. Plus d\u2019oxyge\u0300ne, plus de nitroge\u0300ne: on ne sait pas comment c\u2019est possible. Aucune autre atmosphe\u0300re plane\u0301taire ne ressemble a\u0300 c\u0327a.\u00bb<\/p>\n<p><b>\u00ab Qu\u2019est-ce que c\u2019est que ce truc? \u00bb<\/b><\/p>\n<p>Autre particularite\u0301: l\u2019exoplane\u0300te se trouve tout pre\u0300s de son e\u0301toile, cent fois plus proche que la Terre ne l\u2019est du Soleil. Et que dire de cette e\u0301toile? Elle est si grosse que sa gravite\u0301 est probablement responsable de la forme atypique de cette exoplane\u0300te: un citron.<\/p>\n<p>Ne comptez donc pas trop vous y installer. La\u0300-bas, une anne\u0301e dure moins de huit heures et les zones les plus froides atteignent tout de me\u0302me 650\u00b0C. Contrairement aux autres plane\u0300tes ge\u0301antes, les vents soufflent dans la direction oppose\u0301e de sa rotation. \u00abOn suppose que cette plane\u0300te reve\u0302t un rouge profond, avec des nuages de graphite dans l\u2019atmosphe\u0300re, de\u0301crit Michael Zhang. Une sorte de citron male\u0301fique. Je dirais que c\u2019est l\u2019exoplane\u0300te la plus bizarre jamais vue \u00bb.<\/p>\n<p>La naissance de cette exoplane\u0300te reste un myste\u0300re. \u00abElle orbite autour d\u2019une e\u0301toile qui est aussi comple\u0300tement bizarre. Celle-ci a la masse du Soleil mais la taille d\u2019une ville\u00bb, poursuit chez le me\u0301dia Futurity le scientifique principal de l\u2019e\u0301tude publie\u0301e dans The Astrophysical Journal Letters. \u00abC\u2019e\u0301tait une e\u0301norme surprise, s\u2019exclame Peter Gao, un autre des astronomes implique\u0301s dans la de\u0301couverte. Je me souviens qu\u2019apre\u0300s avoir examine\u0301 les donne\u0301es, notre re\u0301action a\u0300 tous e\u0301tait: \u201cQu\u2019est-ce que c\u2019est que ce truc?\u201d\u00bb<\/p>\n<p>Les e\u0301toiles semblent s\u2019aligner pour ces astronomes, car cette exoplane\u0300te a encore une particularite\u0301 en stock: son e\u0301toile e\u0301met principalement des rayons gamma et d\u2019autres particules a\u0300 haute e\u0301nergie, qui sont invisibles pour la vision infrarouge du te\u0301lescope James-Webb, ce qui permet aux scientifiques d\u2019e\u0301tudier PSR J2322-2650b sous toutes ses coutures tout au long de son orbite. Autre avantage que l\u2019on risque d\u2019avoir bien du mal a\u0300 exploiter: elle serait pleine de diamants. Le carbone aperc\u0327u pourrait se condenser pre\u0300s du noyau et former le pre\u0301cieux mine\u0301ral.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Des scientifiques viennent de de\u0301couvrir une nouvelle exoplane\u0300te gra\u0302ce au te\u0301lescope spatial de la NASA. Elle e\u0301tonne par sa forme, mais aussi par son atmosphe\u0300re riche en carbone. Elle brouille les lignes entre plane\u0300te et e\u0301toile. PSR J2322-2650b, c\u2019est son nom, est une nouvelle exoplane\u0300te de\u0301couverte mardi 16 de\u0301cembre par des scientifiques [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":74087,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-74088","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>D\u00e9couverte D\u2019Une Exoplan\u00e8te en Forme de Citron - Senegal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/politique\/decouverte-dune-exoplanete-en-forme-de-citron\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9couverte D\u2019Une Exoplan\u00e8te en Forme de Citron\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Senegal. Des scientifiques viennent de de\u0301couvrir une nouvelle exoplane\u0300te gra\u0302ce au te\u0301lescope spatial de la NASA. Elle e\u0301tonne par sa forme, mais aussi par son atmosphe\u0300re riche en carbone. Elle brouille les lignes entre plane\u0300te et e\u0301toile. 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