{"id":74047,"date":"2026-01-01T12:00:00","date_gmt":"2026-01-01T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/detection-historique-dune-superkilonova-par-des-astronomes"},"modified":"2026-01-02T02:47:54","modified_gmt":"2026-01-02T02:47:54","slug":"detection-historique-dune-superkilonova-par-des-astronomes","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes","title":{"rendered":"D\u00e9tection Historique D\u2019Une Superkilonova par des Astronomes"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>En 2016, l\u2019annonce de la de\u0301tection d\u2019ondes gravitationnelles par les installations de LIGO et Virgo e\u0301tait retentissante: elle rajoutait une pierre a\u0300 l\u2019e\u0301difice de l\u2019astrophysique multimessager. Cette discipline permet de sonder l\u2019Univers a\u0300 travers quatre types de signaux \u00ab messagers \u00bb: la lumie\u0300re, les neutrinos, les rayons cosmiques et les ondes gravitationnelles.<\/p>\n<p>Ces dernie\u0300res sont engendre\u0301es par la fusion de trous noirs, d\u2019e\u0301toiles a\u0300 neutrons ou me\u0302me de ces deux types de corps ce\u0301lestes. Si la fin de vie des e\u0301toiles massives se re\u0301sume souvent a\u0300 une explosion en supernova, les kilonovas, issues de la fusion de deux e\u0301toiles a\u0300 neutrons, illustrent quant a\u0300 elles une autre facette du cycle de vie de ces e\u0301toiles. Ce phe\u0301nome\u0300ne n\u2019a pour l\u2019instant e\u0301te\u0301 confirme\u0301 qu\u2019une fois, en 2017.<\/p>\n<p>The\u0301oriquement, supernova et kilonova pourraient me\u0302me se succe\u0301der dans une double explosion cataclysmique. Ainsi, une e\u0301tude publie\u0301e le 15 de\u0301cembre dans The Astrophysical Journal Letters et mene\u0301e par une collaboration internationale re\u0301unissant les de\u0301tecteurs d\u2019ondes gravitationnelles LIGO (Etats-Unis), Virgo (Italie) et KAGRA (Japon) de\u0301voile la possible premie\u0300re de\u0301tection d\u2019une \u00ab superkilonova \u00bb, soit une supernova qui aurait engendre\u0301 une kilonova en explosant.<\/p>\n<p><b>Une double explosion intrigante<\/b><\/p>\n<p>Cette nouvelle e\u0301tude relate la possible de\u0301couverte d\u2019une kilonova, nomme\u0301e AT2025ulz et localise\u0301e a\u0300 1,3 milliard d\u2019anne\u0301es-lumie\u0300re, une distance a\u0300 laquelle on trouve des millions de galaxies. Elle constituerait donc l\u2019e\u0301tape finale d\u2019un phe\u0301nome\u0300ne ine\u0301dit de double explosion, faisant e\u0301cho a\u0300 une premie\u0300re explosion de supernova (voir vide\u0301o ci-dessous). Deux e\u0301toiles a\u0300 neutrons seraient ne\u0301es de ce phe\u0301nome\u0300ne, pour ensuite fusionner et former une kilonova. Cet e\u0301ve\u0301nement astronomique a e\u0301te\u0301 envisage\u0301 mais n\u2019a, pour l\u2019heure, jamais e\u0301te\u0301 observe\u0301.<\/p>\n<p>Les trois instruments chasseurs d\u2019ondes gravitationnelles l\u2019ont de\u0301tecte\u0301 le 18 aou\u0302t 2025, soulevant un certain scepticisme dans la communaute\u0301 scientifique: \u00ab Au de\u0301but, pendant environ trois jours, l\u2019e\u0301ruption ressemblait trait pour trait a\u0300 la premie\u0300re kilonova de 2017. Tout le monde s\u2019efforc\u0327ait de l\u2019observer et de l\u2019analyser, mais elle a ensuite commence\u0301 a\u0300 ressembler davantage a\u0300 une supernova, et certains astronomes ont perdu tout inte\u0301re\u0302t. Pas nous \u00bb, rapporte dans un communique\u0301 Mansi Kasliwal, professeure d\u2019astronomie et directrice de l\u2019Observatoire du Palomar de Caltech, situe\u0301 en Californie (Etats-Unis).<\/p>\n<p>Ainsi, durant les premie\u0300res 72 heures d\u2019observation, l\u2019e\u0301ve\u0301nement ressemblait fortement a\u0300 une kilonova classique. Puis plusieurs te\u0301lescopes, dont celui de l\u2019observatoire du Mont Keck d\u2019Hawai\u0308 ou le Fraunhofer de l\u2019observatoire du Wendelstein en Allemagne, ont observe\u0301 une deuxie\u0300me phase lumineuse comportant des signatures spectrales typiques d\u2019une supernova, dont la de\u0301tection d\u2019hydroge\u0300ne.<\/p>\n<p>Cette e\u0301volution inattendue a pousse\u0301 les astronomes a\u0300 approfondir leurs analyses, combinant donne\u0301es optiques, spectres et ondes gravitationnelles, afin de tester si le mode\u0300le hybride \u2013 une supernova suivie tre\u0300s rapidement d\u2019une kilonova \u2013 pourrait expliquer l\u2019ensemble des observations.<\/p>\n<p><b>Une e\u0301toile a\u0300 neutrons tre\u0300s peu massive<\/b><\/p>\n<p>Un de\u0301tail sur la potentielle kilonova a interroge\u0301 les astronomes. La masse d\u2019au moins une des e\u0301toiles a\u0300 neutrons de la kilonova est, en the\u0301orie, proble\u0301matique: \u00ab En poursuivant l\u2019expe\u0301rience avec l\u2019analyse des donne\u0301es, il e\u0301tait clair qu\u2019au moins un des objets en collision s\u2019ave\u0301rait moins massif qu\u2019une e\u0301toile a\u0300 neutrons typique \u00bb, explique David Reitze, directeur ge\u0301ne\u0301ral de LIGO et professeur spe\u0301cialiste de physique des lasers a\u0300 Caltech.<\/p>\n<p>Les mode\u0300les d\u2019e\u0301volution stellaire enseignent en effet que ces corps ce\u0301lestes repre\u0301sentent des restes de supernova, larges de quelques kilome\u0300tres et pesant entre 1,2 et trois masses solaires. Cette de\u0301tection remettrait alors en cause ce que nous savons de ces astres denses.<\/p>\n<p>La faible masse estime\u0301e pour l\u2019un des objets en collision est difficile a\u0300 concilier avec les mode\u0300les classiques de formation des e\u0301toiles a\u0300 neutrons. Si cette estimation se confirme, elle pourrait indiquer une formation non standard, via fragmentation du coeur de la supernova en une e\u0301toile neutronique, ce qui, loin d\u2019e\u0301carter l\u2019hypothe\u0300se de la \u00ab superkilonova \u00bb, pourrait me\u0302me en constituer une preuve indirecte, bien qu\u2019elle ne soit pas encore de\u0301finitive.<\/p>\n<p><b>D\u2019autres observations pour confirmer la the\u0301orie des superkilonovas<\/b><\/p>\n<p>De futures observations seront ainsi ne\u0301cessaires pour confirmer la re\u0301alite\u0301 de cette \u00ab superkilonova \u00bb: \u00ab De futurs e\u0301ve\u0301nements de kilonovas peuvent ne pas ressembler a\u0300 celui de GW170817 (la kilonova de 2017, ndlr) et peuvent e\u0302tre confondus avec des supernovas. Nous pouvons envisager d\u2019autres possibilite\u0301s en nous basant sur des donne\u0301es du Zwicky Transient Facility, de l\u2019observatoire Vera Rubin et d\u2019autres projets comme le te\u0301lescope spatial Nancy Grace Roman, l\u2019UVEX (Ultraviolet Explorer), le Deep Synodic Array-2000 et le Cryoscope de Caltech, localise\u0301 en Antarctique. Nous ne savons pas avec certitude si nous avons de\u0301couvert une superkilonova, mais cette de\u0301tection ouvre de\u0301finitivement une nouvelle fene\u0302tre sur l\u2019astrophysique \u00bb, conclut Mansi Kasliwal.<\/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. En 2016, l\u2019annonce de la de\u0301tection d\u2019ondes gravitationnelles par les installations de LIGO et Virgo e\u0301tait retentissante: elle rajoutait une pierre a\u0300 l\u2019e\u0301difice de l\u2019astrophysique multimessager. Cette discipline permet de sonder l\u2019Univers a\u0300 travers quatre types de signaux \u00ab messagers \u00bb: la lumie\u0300re, les neutrinos, les rayons cosmiques et les ondes gravitationnelles. [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":74046,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-74047","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>D\u00e9tection Historique D\u2019Une Superkilonova par des Astronomes - Senegal<\/title>\n<meta name=\"description\" content=\"En 2016, l\u2019annonce de la de\u0301tection d\u2019ondes gravitationnelles par les installations de LIGO et Virgo e\u0301tait retentissant ...\" \/>\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\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9tection Historique D\u2019Une Superkilonova par des Astronomes\" \/>\n<meta property=\"og:description\" content=\"En 2016, l\u2019annonce de la de\u0301tection d\u2019ondes gravitationnelles par les installations de LIGO et Virgo e\u0301tait retentissant ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-01T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-02T02:47:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2026\/01\/sm_1767350842.565556.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=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"D\u00e9tection Historique D\u2019Une Superkilonova par des Astronomes\",\"datePublished\":\"2026-01-01T12:00:00+00:00\",\"dateModified\":\"2026-01-02T02:47:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes\"},\"wordCount\":915,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2026\/01\/sm_1767350842.565556.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/detection-historique-dune-superkilonova-par-des-astronomes\",\"name\":\"D\u00e9tection Historique D\u2019Une Superkilonova par des Astronomes - 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