{"id":7265,"date":"2022-05-29T17:54:40","date_gmt":"2022-05-29T17:54:40","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova"},"modified":"2022-05-29T18:19:00","modified_gmt":"2022-05-29T18:19:00","slug":"ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova","title":{"rendered":"Ce syst\u00e8me de 4 \u00e9toiles pourrait d\u00e9clencher une rare supernova !"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span>Les supernovas thermonucl\u00e9aires sont parmi les ph\u00e9nom\u00e8nes les plus rares : il s&rsquo;en produit seulement deux par si\u00e8cle dans notre Galaxie, qui compte pourtant des centaines de milliards d&rsquo;\u00e9toiles. Mais des chercheurs viennent tout juste de trouver un potentiel d\u00e9clencheur de ces cataclysmes stellaires.<\/p>\n<p>En 2017, des chercheurs de l&rsquo;universit\u00e9 de Canterbury en Nouvelle-Z\u00e9lande d\u00e9couvraient un syst\u00e8me quadruple d&rsquo;\u00e9toiles, depuis baptis\u00e9 HD74438. Plus pr\u00e9cis\u00e9ment, il s&rsquo;agit d&rsquo;un double syst\u00e8me d&rsquo;\u00e9toiles binaires : un premier avec une orbite rapproch\u00e9e et rapide, et l&rsquo;autre bien plus \u00e9loign\u00e9 et lent. Dans une nouvelle publication de la revue Nature Astronomy, des astrophysiciens \u00e9tudient les \u00e9volutions possibles de ce syst\u00e8me, en se basant sur des mod\u00e9lisations de l&rsquo;orbite de chaque \u00e9toile qu&rsquo;il contient.<\/p>\n<p>Le syst\u00e8me quadruple le plus jeune jamais trouv\u00e9<\/p>\n<p>Situ\u00e9 dans la constellation de Vela visible seulement dans l&rsquo;h\u00e9misph\u00e8re sud, HD74438 a \u00e9t\u00e9 d\u00e9couvert lors d&rsquo;une campagne d&rsquo;observation par le satellite de l\u2019ESA Gaia, qui a d\u00e9j\u00e0 identifi\u00e9 plus de 100.000 \u00e9toiles de notre Galaxie. Ensuite, tout s&rsquo;est fait gr\u00e2ce \u00e0 des spectrographes \u00e0 haute r\u00e9solution situ\u00e9s \u00e0 l&rsquo;universit\u00e9 de Canterbury en Nouvelle-Z\u00e9lande et le Southern African Large Telescope en Afrique du Sud. Ils permettent de caract\u00e9riser le spectre lumineux de l\u2019\u00e9toile, c&rsquo;est-\u00e0-dire de d\u00e9composer la lumi\u00e8re qu&rsquo;elle \u00e9met et d&rsquo;en analyser l&rsquo;intensit\u00e9 pour chaque longueur d&rsquo;onde. Gr\u00e2ce \u00e0 cette m\u00e9thode ils peuvent d\u00e9duire non seulement la temp\u00e9rature de l&rsquo;\u00e9toile, mais aussi la composition de son atmosph\u00e8re.<\/p>\n<p>#Space: astronomers spot #QuadrupleStars (actually \u00ab\u00a0double-binary\u00a0\u00bb star system HD74438) that may spark #supernova explosions<\/p>\n<p>???? https:\/\/t.co\/NDFbOyo16p via @phsyorg_com pic.twitter.com\/p3VsAbvw1w<\/p>\n<p>\u2014 Maxime Duprez (@maximaxoo) May 16, 2022<\/p>\n<p>Ce syst\u00e8me stellaire de 43 millions d&rsquo;ann\u00e9es est encore jeune, car si cela para\u00eet long, rappelons que notre Soleil a lui d\u00e9j\u00e0 4,6 milliards d&rsquo;ann\u00e9es ! Cela fait de lui le plus jeune syst\u00e8me quadruple jamais trouv\u00e9 \u00e0 ce jour. Ces syst\u00e8mes \u00e0 quatre \u00e9toiles sont rares, de l&rsquo;ordre de quelques pourcents des syst\u00e8mes multiples qui sont d\u00e9j\u00e0 assez rares, et ont des \u00e9volutions complexes. Dans ce cas pr\u00e9cis, le syst\u00e8me binaire externe exerce une attraction gravitationnelle sur le syst\u00e8me interne, et tend \u00e0 d\u00e9former les orbites de ses deux \u00e9toiles.<\/p>\n<p>Une future supernova thermonucl\u00e9aire ?<\/p>\n<p>Dans le but de mod\u00e9liser les \u00e9volutions possibles d&rsquo;HD74438, l&rsquo;\u00e9quipe de scientifiques a mod\u00e9lis\u00e9 les effets gravitationnels qui r\u00e9gissent le syst\u00e8me quadruple. Ils ont ainsi montr\u00e9 que l&rsquo;excentricit\u00e9 du syst\u00e8me interne tendait \u00e0 augmenter. En pratique, cela signifie que la trajectoire va \u00e9voluer pour \u00eatre de moins en moins circulaire : une collision pourrait se d\u00e9clencher suite \u00e0 cette d\u00e9viation, entre une \u00e9toile de chaque syst\u00e8me.<\/p>\n<p>Et de cette collision d\u00e9coulerait&#8230; tout d&rsquo;abord une naine blanche ! Ce n&rsquo;est pas encore la supernova thermonucl\u00e9aire tant attendue. \u00ab Une \u00e9toile comme notre soleil finira sa vie sous la forme d&rsquo;une petite \u00e9toile morte dense connue sous le nom de naine blanche, et la masse des naines blanches ne peut pas d\u00e9passer la limite dite de Chandrasekhar (environ 1,4 fois la masse du soleil) \u00bb, explique la professeure Karen Pollard, premi\u00e8re autrice de l&rsquo;\u00e9tude et astrophysicienne \u00e0 l&rsquo;universit\u00e9 de Canterbury. \u00ab Si c&rsquo;est le cas, en raison d&rsquo;\u00e9v\u00e9nements de transfert de masse ou de fusion, il peut s&rsquo;effondrer et produire une supernova thermonucl\u00e9aire. \u00bb Et c&rsquo;est pr\u00e9cis\u00e9ment ce qu&rsquo;il se produirait pour HD74438 !<\/p>\n<p>\u00ab L&rsquo;\u00e9volution des quadruples stellaires tels que HD 744384 repr\u00e9sente donc une nouvelle voie prometteuse pour former des explosions de supernova thermonucl\u00e9aires dans l&rsquo;Univers, conclut-elle. Fait int\u00e9ressant, 70 % \u00e0 85 % de toutes les supernovas thermonucl\u00e9aires sont d\u00e9sormais suspect\u00e9es de r\u00e9sulter de l&rsquo;explosion de naines blanches avec des masses sous-Chandrasekhar. \u00c0 la suite d&rsquo;un transfert de masse ou de fusions, ces \u00e9toiles naines blanches peuvent exploser en une supernova thermonucl\u00e9aire. \u00bb De quoi questionner les mod\u00e8les actuels des supernovas thermonucl\u00e9aires.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/madagascar\">Madagascar<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Madagascar. Les supernovas thermonucl\u00e9aires sont parmi les ph\u00e9nom\u00e8nes les plus rares : il s&rsquo;en produit seulement deux par si\u00e8cle dans notre Galaxie, qui compte pourtant des centaines de milliards d&rsquo;\u00e9toiles. Mais des chercheurs viennent tout juste de trouver un potentiel d\u00e9clencheur de ces cataclysmes stellaires. En 2017, des chercheurs de l&rsquo;universit\u00e9 de Canterbury [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":7264,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[36,50,49],"class_list":["post-7265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-madagascar","tag-madagascar"],"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>Ce syst\u00e8me de 4 \u00e9toiles pourrait d\u00e9clencher une rare supernova ! - Madagascar<\/title>\n<meta name=\"description\" content=\"Les supernovas thermonucl\u00e9aires sont parmi les ph\u00e9nom\u00e8nes les plus rares : il s&#039;en produit seulement deux par si\u00e8cle dan ...\" \/>\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\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ce syst\u00e8me de 4 \u00e9toiles pourrait d\u00e9clencher une rare supernova !\" \/>\n<meta property=\"og:description\" content=\"Les supernovas thermonucl\u00e9aires sont parmi les ph\u00e9nom\u00e8nes les plus rares : il s&#039;en produit seulement deux par si\u00e8cle dan ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova\" \/>\n<meta property=\"og:site_name\" content=\"Madagascar\" \/>\n<meta property=\"article:published_time\" content=\"2022-05-29T17:54:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-05-29T18:19:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2022\/05\/postQueueImg_1-6293b8fc1992c.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"768\" \/>\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\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Ce syst\u00e8me de 4 \u00e9toiles pourrait d\u00e9clencher une rare supernova !\",\"datePublished\":\"2022-05-29T17:54:40+00:00\",\"dateModified\":\"2022-05-29T18:19:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova\"},\"wordCount\":731,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/madagascar\/sites\/56\/2022\/05\/postQueueImg_1-6293b8fc1992c.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Madagascar\",\"Madagascar\"],\"articleSection\":[\"Divers\",\"homepage-french\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova\",\"url\":\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/ce-systeme-de-4-etoiles-pourrait-declencher-une-rare-supernova\",\"name\":\"Ce syst\u00e8me de 4 \u00e9toiles pourrait d\u00e9clencher une rare supernova ! 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