{"id":74428,"date":"2026-01-30T12:00:00","date_gmt":"2026-01-30T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/etoile-semblable-au-soleil-seteint-brutalement"},"modified":"2026-01-31T03:15:53","modified_gmt":"2026-01-31T03:15:53","slug":"etoile-semblable-au-soleil-seteint-brutalement","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement","title":{"rendered":"\u00c9toile Semblable au Soleil S\u2019\u00e9teint Brutalement"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>A quelque 3000 anne\u0301es-lumie\u0300re, l\u2019e\u0301toile catalogue\u0301e sous le nom de J0705+0612 s\u2019est brusquement e\u0301teinte en septembre 2024. Plus exactement, elle a perdu presque 40 fois sa luminosite\u0301 habituelle. Un affadissement qui s\u2019est prolonge\u0301 durant neuf mois, jusqu\u2019en mai 2025. Or ce type d\u2019astre, similaire au Soleil, ne peut connai\u0302tre de telles variations sans qu\u2019une cause exte\u0301rieure ne soit invoque\u0301e. Des observations a\u0300 l\u2019aide de multiples te\u0301lescopes et instruments de sondage ont permis de de\u0301nicher le coupable: un nuage de gaz et de poussie\u0300res se de\u0301plac\u0327ant lentement.<\/p>\n

Un objet au centre du nuage<\/b><\/p>\n

Selon l\u2019e\u0301tude publie\u0301e dans la revue The Astronomical Journal, ce nuage se situe a\u0300 deux milliards de kilome\u0300tres de l\u2019e\u0301toile et mesure pre\u0300s de 200 millions de kilome\u0300tres de diame\u0300tre. Les donne\u0301es indiquent aussi que ce nuage n\u2019est pas isole\u0301. Il est lie\u0301 gravitationnellement a\u0300 un second objet en son centre, lui-me\u0302me en orbite dans les re\u0301gions externes du syste\u0300me. Sa masse minimale correspond a\u0300 plusieurs fois celle de Jupiter, mais sa nature exacte reste inde\u0301termine\u0301e: plane\u0300te, naine brune ou e\u0301toile de tre\u0300s faible masse?<\/p>\n

En mars 2025, l\u2019e\u0301quipe a utilise\u0301 l\u2019instrument GHOST (Gemini High-resolution Optical SpecTrograph), re\u0301cemment installe\u0301 sur Gemini South. En de\u0301composant la lumie\u0300re stellaire filtre\u0301e par le nuage, les chercheurs ont identifie\u0301 la pre\u0301sence de me\u0301taux, notamment du fer et du calcium, sous forme de gaz. La finesse des mesures a permis de reconstruire les mouvements des gaz et, pour la premie\u0300re fois, de de\u0301tecter des vents de me\u0301taux dans un disque orbitant autour d\u2019un objet secondaire.<\/p>\n

Collision plane\u0301taire lointaine?<\/b><\/p>\n

L\u2019e\u0301toile ho\u0302te est a\u0302ge\u0301e de plus de deux milliards d\u2019anne\u0301es, bien au-dela\u0300 de la phase ou\u0300 les disques protoplane\u0301taires sont cense\u0301s subsister. Un reliquat de formation initiale parai\u0302t donc peu probable. Les auteurs avancent l\u2019hypothe\u0300se d\u2019une collision tardive entre deux plane\u0300tes dans les re\u0301gions externes du syste\u0300me qui aurait produit une e\u0301norme quantite\u0301 de de\u0301bris, rapidement e\u0301tale\u0301s en nuage et maintenus par la gravite\u0301 de l\u2019objet secondaire. Des donne\u0301es d\u2019archives sugge\u0300rent d\u2019ailleurs que des e\u0301pisodes d\u2019assombrissement similaires ont de\u0301ja\u0300 eu lieu en 1937 et en 1981, selon un cycle d\u2019environ 44 ans.<\/p>\n

Pour plus d’informations et d’analyses sur la Senegal<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Senegal. A quelque 3000 anne\u0301es-lumie\u0300re, l\u2019e\u0301toile catalogue\u0301e sous le nom de J0705+0612 s\u2019est brusquement e\u0301teinte en septembre 2024. Plus exactement, elle a perdu presque 40 fois sa luminosite\u0301 habituelle. Un affadissement qui s\u2019est prolonge\u0301 durant neuf mois, jusqu\u2019en mai 2025. Or ce type d\u2019astre, similaire au Soleil, ne peut connai\u0302tre de telles variations […]<\/p>\n","protected":false},"author":82,"featured_media":74427,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-74428","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"\n\u00c9toile Semblable au Soleil S\u2019\u00e9teint Brutalement - Senegal<\/title>\n<meta name=\"description\" content=\"A quelque 3000 anne\u0301es-lumie\u0300re, l\u2019e\u0301toile catalogue\u0301e sous le nom de J0705+0612 s\u2019est brusquement e\u0301teinte en septembre ...\" \/>\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\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c9toile Semblable au Soleil S\u2019\u00e9teint Brutalement\" \/>\n<meta property=\"og:description\" content=\"A quelque 3000 anne\u0301es-lumie\u0300re, l\u2019e\u0301toile catalogue\u0301e sous le nom de J0705+0612 s\u2019est brusquement e\u0301teinte en septembre ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-30T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-31T03:15:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2026\/01\/sm_1769857721.39777.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"\u00c9toile Semblable au Soleil S\u2019\u00e9teint Brutalement\",\"datePublished\":\"2026-01-30T12:00:00+00:00\",\"dateModified\":\"2026-01-31T03:15:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement\"},\"wordCount\":442,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2026\/01\/sm_1769857721.39777.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/etoile-semblable-au-soleil-seteint-brutalement\",\"name\":\"\u00c9toile Semblable au Soleil S\u2019\u00e9teint Brutalement - 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