{"id":65623,"date":"2025-02-20T12:00:00","date_gmt":"2025-02-20T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/premiere-exoplanete-decouverte-autour-dune-etoile-hyperveloce"},"modified":"2025-02-20T12:00:00","modified_gmt":"2025-02-20T12:00:00","slug":"premiere-exoplanete-decouverte-autour-dune-etoile-hyperveloce","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/premiere-exoplanete-decouverte-autour-dune-etoile-hyperveloce","title":{"rendered":"Premi\u00e8re Exoplan\u00e8te D\u00e9couverte Autour D\u2019Une \u00c9toile Hyperv\u00e9loce"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Elle file dans la galaxie a\u0300 plus de 540 km\/s, soit deux fois plus vite que le Soleil. Certes, cette e\u0301toile ne bat pas de record de vitesse stellaire (celui-ci a e\u0301te\u0301 e\u0301tabli en 2015 a\u0300 pre\u0300s de 1200 km\/s) mais elle pourrait e\u0302tre la premie\u0300re de sa cate\u0301gorie a\u0300 posse\u0301der une plane\u0300te qui orbite autour. Sa cate\u0301gorie ? Celle des e\u0301toiles hyperve\u0301loces, ces astres qui se de\u0301placent a\u0300 des vitesses de 500 a\u0300 plus de 1000 km\/s dans la Voie lacte\u0301e, soit suffisamment vite pour e\u0301chapper a\u0300 son attraction ; elles peuvent donc s\u2019en e\u0301chapper et foncer dans l\u2019espace intergalactique. A l\u2019inverse, d\u2019autres sont originaires d\u2019autres galaxies, notamment du Grand nuage de Magellan.<\/p>\n<p><b>Une exoplane\u0300te prise dans la course d\u2019une e\u0301toile hyperve\u0301loce<\/b><\/p>\n<p>Cette nouvelle e\u0301toile a e\u0301te\u0301 repe\u0301re\u0301e gra\u0302ce aux campagnes d\u2019observation des projets MOA (Microlensing Observations in Astrophysics) et OGLE (Optical Gravitational Lensing Experiment). Ces programmes scrutent le ciel a\u0300 la recherche de distorsions lumineuses cause\u0301es par des objets massifs passant devant des e\u0301toiles d\u2019arrie\u0300re-plan et amplifiant la lumie\u0300re de ces dernie\u0300res. C\u2019est ce que les spe\u0301cialistes appellent des microlentilles gravitationnelles. En analysant la lumie\u0300re obtenue en 2011, lors de l\u2019e\u0301ve\u0300nement MOA-2011-BLG-262, les scientifiques ont constate\u0301 que le signal re\u0301ve\u0301lait l\u2019existence d\u2019une paire d\u2019objets ce\u0301lestes dont l\u2019un est 2300 fois plus lourd que l\u2019autre.<\/p>\n<p>\u00ab De\u0301terminer le rapport de masse est facile \u00bb, a de\u0301clare\u0301 dans un communique\u0301 de la Nasa David Bennett, co-auteur de l\u2019e\u0301tude publie\u0301e dans la revue The Astronomical Journal. \u00ab Il est beaucoup plus difficile de calculer leurs masses re\u0301elles \u00bb. D\u2019ailleurs, les scientifiques ont d\u2019abord e\u0301mis deux hypothe\u0300ses: il s\u2019agirait soit d\u2019une grosse plane\u0300te errante quatre fois plus massive que Jupiter entoure\u0301e d\u2019une Lune ou d\u2019une e\u0301toile environ 20% plus massive que notre Soleil et une plane\u0300te environ 29 fois plus lourde que la Terre.<\/p>\n<p><b>Une formation myste\u0301rieuse<\/b><\/p>\n<p>De nouvelles observations avec le satellite Gaia et le te\u0301lescope Keck a\u0300 Hawai\u0308 font dore\u0301navant pencher la balance vers l\u2019hypothe\u0300se de l\u2019e\u0301toile avec une plane\u0300te en orbite. Toutefois, il faudra encore re\u0301aliser d\u2019autres mesures durant les prochaines anne\u0301es. Si cette de\u0301couverte est confirme\u0301e, elle posera de nouvelles questions aux spe\u0301cialistes des syste\u0300mes plane\u0301taires.<\/p>\n<p>En effet, les mode\u0300les actuels supposent ge\u0301ne\u0301ralement des environnements relativement stables pour que les plane\u0300tes puissent se former. Or la vitesse de l\u2019e\u0301toile sugge\u0300re qu\u2019elle a subi une interaction gravitationnelle intense dans son passe\u0301, peut-e\u0302tre une e\u0301jection violente d\u2019un syste\u0300me stellaire multiple ou une rencontre rapproche\u0301e avec un trou noir supermassif.<\/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. Elle file dans la galaxie a\u0300 plus de 540 km\/s, soit deux fois plus vite que le Soleil. Certes, cette e\u0301toile ne bat pas de record de vitesse stellaire (celui-ci a e\u0301te\u0301 e\u0301tabli en 2015 a\u0300 pre\u0300s de 1200 km\/s) mais elle pourrait e\u0302tre la premie\u0300re de sa cate\u0301gorie a\u0300 posse\u0301der une [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":65622,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-65623","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>Premi\u00e8re Exoplan\u00e8te D\u00e9couverte Autour D\u2019Une \u00c9toile Hyperv\u00e9loce - 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\/premiere-exoplanete-decouverte-autour-dune-etoile-hyperveloce\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Premi\u00e8re Exoplan\u00e8te D\u00e9couverte Autour D\u2019Une \u00c9toile Hyperv\u00e9loce\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; Senegal. 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