{"id":69948,"date":"2025-07-17T12:00:00","date_gmt":"2025-07-17T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/des-astronomes-observent-la-naissance-dun-systeme-solaire"},"modified":"2025-07-17T19:32:44","modified_gmt":"2025-07-17T19:32:44","slug":"des-astronomes-observent-la-naissance-dun-systeme-solaire","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/des-astronomes-observent-la-naissance-dun-systeme-solaire","title":{"rendered":"Des Astronomes Observent la Naissance D\u2019Un Syst\u00e8me Solaire"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Des astronomes ont observe\u0301 les premie\u0300res e\u0301tapes de la naissance de plane\u0300tes autour d\u2019une e\u0301toile, un processus similaire a\u0300 celui qui a forme\u0301 notre propre syste\u0300me solaire, selon une e\u0301tude publie\u0301e mercredi dans Nature.<\/p>\n<p>\u00ab Pour la premie\u0300re fois, nous avons identifie\u0301 le moment le plus pre\u0301coce ou\u0300 la formation d\u2019une plane\u0300te de\u0301bute autour d\u2019une e\u0301toile autre que notre Soleil \u00bb, s\u2019enthousiasme Melissa McClure, professeure a\u0300 l\u2019universite\u0301 de Leiden (Pays-Bas) et principale autrice de l\u2019e\u0301tude, dans un communique\u0301 de l\u2019Observatoire europe\u0301en austral (ESO).<\/p>\n<p>Situe\u0301e dans la ne\u0301buleuse d\u2019Orion, a\u0300 1.300 anne\u0301es-lumie\u0300re de nous, HOPS-315 est une jeune e\u0301toile qui ressemble beaucoup a\u0300 notre Soleil dans de sa prime jeunesse.<\/p>\n<p>Ces e\u0301toiles naissantes sont entoure\u0301es de disques de gaz et de poussie\u0300res, appele\u0301s \u00ab disques protoplane\u0301taires \u00bb, dans lesquels se forment les plane\u0300tes.<\/p>\n<p>A l\u2019inte\u0301rieur, des mine\u0301raux cristallins contenant du monoxyde de silicium (SIO) peuvent s\u2019y condenser a\u0300 des tempe\u0301ratures extre\u0302mement e\u0301leve\u0301es.<\/p>\n<p>Avec le temps, ils s\u2019agre\u0300gent, gagnant en taille et en masse pour former des \u00ab plane\u0301te\u0301simaux \u00bb, les premie\u0300res parties solides des plane\u0300tes.<\/p>\n<p>Dans notre syste\u0300me solaire, ces mine\u0301raux cristallins, qui ont ensuite donne\u0301 naissance a\u0300 des plane\u0300tes comme la Terre ou au noyau de Jupiter, ont e\u0301te\u0301 pie\u0301ge\u0301s dans d\u2019anciennes me\u0301te\u0301orites. Que les astronomes utilisent pour dater le de\u0301but de la formation de notre coin de la Voie lacte\u0301e.<\/p>\n<p>En observant le disque autour de HOPS-315, les auteurs de l\u2019e\u0301tude ont re\u0301ussi a\u0300 trouver des preuves que ces mine\u0301raux chauds commencer a\u0300 s\u2019y condenser.<\/p>\n<p>Leurs re\u0301sultats montrent que le SIO est pre\u0301sent autour de la jeune e\u0301toile a\u0300 l\u2019e\u0301tat gazeux ainsi qu\u2019a\u0300 l\u2019inte\u0301rieur de ces mine\u0301raux cristallins, ce qui sugge\u0300re qu\u2019il ne fait que commencer a\u0300 se solidifier.<\/p>\n<p>\u00ab Ce processus n\u2019a jamais e\u0301te\u0301 observe\u0301 auparavant dans un disque protoplane\u0301taire, ni nulle part ailleurs en dehors de notre syste\u0300me solaire \u00bb, souligne Melissa McClure (E\u0301tats-Unis) et coauteur de l\u2019e\u0301tude.<\/p>\n<p>Ces mine\u0301raux ont e\u0301te\u0301 identifie\u0301s pour la premie\u0300re fois a\u0300 l\u2019aide du te\u0301lescope spatial James Webb (JWST). Puis les scientifiques ont observe\u0301 le syste\u0300me avec l\u2019instrument ALMA de l\u2019ESO au Chili, pour de\u0301terminer l\u2019origine exacte des signaux chimiques.<\/p>\n<p>Ils ont de\u0301couvert que ceux-ci provenaient d\u2019une petite portion du disque autour de l\u2019e\u0301toile, e\u0301quivalente a\u0300 l\u2019orbite de la ceinture d\u2019aste\u0301roi\u0308des qui entoure notre Soleil. Ce qui fait de HOPS-315 un miroir de notre propre passe\u0301.<\/p>\n<p>\u00ab Ce syste\u0300me est l\u2019un des meilleurs que nous connaissions pour explorer certains des processus qui se sont produits dans notre syste\u0300me solaire \u00bb, se re\u0301jouit Merel van\u2019t Hoff, professeure a\u0300 l\u2019universite\u0301 de Purdue (E\u0301tats-Unis) et coautrice de l\u2019e\u0301tude.<\/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><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Des astronomes ont observe\u0301 les premie\u0300res e\u0301tapes de la naissance de plane\u0300tes autour d\u2019une e\u0301toile, un processus similaire a\u0300 celui qui a forme\u0301 notre propre syste\u0300me solaire, selon une e\u0301tude publie\u0301e mercredi dans Nature. \u00ab Pour la premie\u0300re fois, nous avons identifie\u0301 le moment le plus pre\u0301coce ou\u0300 la formation d\u2019une plane\u0300te [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":69947,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-69948","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>Des Astronomes Observent la Naissance D\u2019Un Syst\u00e8me Solaire - 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