{"id":13224,"date":"2024-02-26T12:31:43","date_gmt":"2024-02-26T12:31:43","guid":{"rendered":"https:\/\/www.africa-press.net\/burundi\/politique\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale"},"modified":"2024-02-27T05:18:18","modified_gmt":"2024-02-27T05:18:18","slug":"une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale","title":{"rendered":"Une cicatrice m\u00e9tallique d\u00e9couverte sur une \u00e9toile cannibale"},"content":{"rendered":"

Africa-Press – Burundi. <\/strong><\/span>Dans quelques milliards d\u2019anne\u0301es, le Soleil entamera une nouvelle phase de sa vie et grossira fortement pour se transformer en ge\u0301ante rouge, puis il se refroidira lentement pour devenir une naine blanche, ultime stade de son existence. Au passage, les plane\u0300tes telluriques (Mercure, Ve\u0301nus, Terre et Mars) connai\u0302tront de grands chamboulements.<\/p>\n

Les premie\u0300res pourraient e\u0302tre de\u0301truites et des dernie\u0300res ne subsisteront que leur noyau. Une grande quantite\u0301 de matie\u0300re, dont de tre\u0300s gros restes plane\u0301taires, pourraient donc se retrouver errant autour de la naine blanche nouvellement forme\u0301e. Et celle-ci d\u2019en avaler quelques-uns: la cicatrice de ce processus vient d\u2019e\u0302tre identifie\u0301e gra\u0302ce au Tre\u0300s grand te\u0301lescope (VLT) de l\u2019Observatoire europe\u0301en austral (ESO).<\/p>\n

Un morceau de la taille de Vesta<\/b><\/p>\n

La cicatrice observe\u0301e consiste en une concentration de me\u0301taux, autrefois contenu dans le manteau d\u2019une plane\u0300te, imprime\u0301s sur la surface de la naine blanche WD 0816-310, vestige de la taille de la Terre d\u2019une e\u0301toile similaire a\u0300 notre Soleil, mais un peu plus grande. \u201cNous avons de\u0301montre\u0301 que ces me\u0301taux proviennent d\u2019un fragment plane\u0301taire aussi grand, voire plus grand, que Vesta, qui mesure environ 500 kilome\u0300tres de diame\u0300tre et qui est le deuxie\u0300me plus grand aste\u0301roi\u0308de du syste\u0300me solaire\u201d, explique, dans un communique\u0301 de l\u2019ESO, Jay Farihi, professeur a\u0300 l\u2019University College de Londres et coauteur de l\u2019e\u0301tude, publie\u0301e dans la revue The Astrophysical Journal Letters.<\/p>\n

Pour de\u0301tecter cette cicatrice stellaire, les astrophysiciens ont utilise\u0301 les spectrographes FORS2 et X-Shooter installe\u0301s sur le VLT pour observer la signature du me\u0301tal dans l\u2019e\u0301toile. Mais contrairement a\u0300 ce qui e\u0301tait attendu, ce me\u0301tal ne se trouvait pas uniforme\u0301ment re\u0301parti dans la naine blanche. En effet, la force du signal perc\u0327u changeait au fur et a\u0300 mesure que l\u2019e\u0301toile tournait, ce qui sugge\u0300re que les me\u0301taux sont concentre\u0301s sur une zone spe\u0301cifique de la surface de l\u2019astre.<\/p>\n

Le ro\u0302le des champs magne\u0301tiques<\/b><\/p>\n

Les chercheurs ont e\u0301galement constate\u0301 que ces changements e\u0301taient synchronise\u0301s avec les variations du champ magne\u0301tique de la naine blanche, ce qui indique que la cicatrice me\u0301tallique est situe\u0301e sur l\u2019un de ses po\u0302les magne\u0301tiques. Ces indices sugge\u0300rent que la matie\u0300re me\u0301tallique a e\u0301te\u0301 volatilise\u0301e pre\u0300s de la naine blanche, mais aussi ionise\u0301 (des e\u0301lectrons ont e\u0301te\u0301 arrache\u0301s des atomes par les rayonnements de l\u2019e\u0301toile). Ce substrat a par la suite e\u0301te\u0301 guide\u0301 vers le po\u0302le magne\u0301tique par le champ magne\u0301tique de la naine blanche. Un processus qui pre\u0301sente des similitudes avec la formation des aurores polaires sur Terre et sur Jupiter.<\/p>\n

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

Africa-Press – Burundi. Dans quelques milliards d\u2019anne\u0301es, le Soleil entamera une nouvelle phase de sa vie et grossira fortement pour se transformer en ge\u0301ante rouge, puis il se refroidira lentement pour devenir une naine blanche, ultime stade de son existence. Au passage, les plane\u0300tes telluriques (Mercure, Ve\u0301nus, Terre et Mars) connai\u0302tront de grands chamboulements. Les […]<\/p>\n","protected":false},"author":82,"featured_media":13223,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,48,45],"class_list":["post-13224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-burundi","tag-burundi"],"yoast_head":"\nUne cicatrice m\u00e9tallique d\u00e9couverte sur une \u00e9toile cannibale - Burundi<\/title>\n<meta name=\"description\" content=\"Dans quelques milliards d\u2019anne\u0301es, le Soleil entamera une nouvelle phase de sa vie et grossira fortement pour se transfo ...\" \/>\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\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Une cicatrice m\u00e9tallique d\u00e9couverte sur une \u00e9toile cannibale\" \/>\n<meta property=\"og:description\" content=\"Dans quelques milliards d\u2019anne\u0301es, le Soleil entamera une nouvelle phase de sa vie et grossira fortement pour se transfo ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale\" \/>\n<meta property=\"og:site_name\" content=\"Burundi\" \/>\n<meta property=\"article:published_time\" content=\"2024-02-26T12:31:43+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-27T05:18:18+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/burundi\/sites\/47\/2024\/02\/sm_1708993867.23145.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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/burundi\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Une cicatrice m\u00e9tallique d\u00e9couverte sur une \u00e9toile cannibale\",\"datePublished\":\"2024-02-26T12:31:43+00:00\",\"dateModified\":\"2024-02-27T05:18:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale\"},\"wordCount\":521,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/burundi\/sites\/47\/2024\/02\/sm_1708993867.23145.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Burundi\",\"Burundi\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale\",\"url\":\"https:\/\/www.africa-press.net\/burundi\/toutes-les-actualites\/une-cicatrice-metallique-decouverte-sur-une-etoile-cannibale\",\"name\":\"Une cicatrice m\u00e9tallique d\u00e9couverte sur une \u00e9toile cannibale - 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