{"id":36457,"date":"2023-07-22T19:47:03","date_gmt":"2023-07-22T19:47:03","guid":{"rendered":"https:\/\/www.africa-press.net\/mali\/politique\/des-astronomes-decouvrent-une-stupefiante-etoile-a-deux-faces-nommee-janus"},"modified":"2023-07-22T21:18:35","modified_gmt":"2023-07-22T21:18:35","slug":"des-astronomes-decouvrent-une-stupefiante-etoile-a-deux-faces-nommee-janus","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/mali\/divers\/des-astronomes-decouvrent-une-stupefiante-etoile-a-deux-faces-nommee-janus","title":{"rendered":"Des astronomes d\u00e9couvrent une stup\u00e9fiante \u00e9toile \u00e0 deux faces, nomm\u00e9e \u201cJanus\u201d"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Mali. <\/strong><\/span>Nomme\u0301e Janus d\u2019apre\u0300s le dieu romain a\u0300 deux visages, une e\u0301toile re\u0301cemment de\u0301couverte posse\u0300de une face compose\u0301e d\u2019he\u0301lium et une autre d\u2019hydroge\u0300ne. Cette naine blanche extraordinaire a fait l\u2019objet d\u2019un article dans la revue Nature.<\/p>\n<p>\u201cLorsque je montre les observations aux gens, ils sont stupe\u0301faits\u201d, glisse Ilaria Caiazzo, chercheuse en post-doctorat a\u0300 l\u2019institut Caltech, premie\u0300re auteure de l\u2019e\u0301tude publie\u0301e dans la revue scientifique Nature (19 juillet 2023), cite\u0301e dans un communique\u0301.<\/p>\n<p>Cette observation est celle d\u2019une \u201cnaine blanche\u201d. Que\u0301sako ? Au fil du temps, n\u2019importe quelle e\u0301toile se transforme d\u2019abord en \u201cge\u0301ante rouge\u201d. Puis, a\u0300 mesure que son c\u0153ur se contracte, elle devient une naine blanche \u2013 c\u2019est d\u2019ailleurs le destin qui attend notre Soleil, d\u2019ici 5 milliards d\u2019anne\u0301es.<\/p>\n<p>Mais \u201cJanus\u201d, du nom du dieu a\u0300 deux faces de la mythologie romaine, n\u2019est pas une naine blanche comme les autres.<\/p>\n<p><b>Une naine blanche \u201cfortement magne\u0301tise\u0301e\u201d<\/b><\/p>\n<p>L\u2019e\u0301toile myste\u0301rieuse a e\u0301te\u0301 de\u0301couverte gra\u0302ce au Zwicky Transient Facility (ZTF), un instrument qui scrute le ciel chaque nuit depuis l\u2019observatoire Palomar du California Institute of Technology (Caltech), pre\u0300s de San Diego (E\u0301tats-Unis).<\/p>\n<p>Ilaria Caiazzo e\u0301tait a\u0300 la recherche de naines blanches \u201cfortement magne\u0301tise\u0301es\u201d, comme l\u2019objet ce\u0301leste connu sous le nom de ZTF J1901+1458, qu\u2019elle et son e\u0301quipe avaient de\u0301couvert pre\u0301ce\u0301demment. Un autre \u201ccandidat\u201d s\u2019est alors distingue\u0301 par ses changements rapides de luminosite\u0301.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/mali\">Mali<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Mali. Nomme\u0301e Janus d\u2019apre\u0300s le dieu romain a\u0300 deux visages, une e\u0301toile re\u0301cemment de\u0301couverte posse\u0300de une face compose\u0301e d\u2019he\u0301lium et une autre d\u2019hydroge\u0300ne. Cette naine blanche extraordinaire a fait l\u2019objet d\u2019un article dans la revue Nature. \u201cLorsque je montre les observations aux gens, ils sont stupe\u0301faits\u201d, glisse Ilaria Caiazzo, chercheuse en post-doctorat a\u0300 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":36456,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,17],"tags":[76,86,19],"class_list":["post-36457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-mali","tag-mali"],"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 d\u00e9couvrent une stup\u00e9fiante \u00e9toile \u00e0 deux faces, nomm\u00e9e \u201cJanus\u201d - Mali<\/title>\n<meta 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