{"id":1263768,"date":"2023-06-19T16:28:07","date_gmt":"2023-06-19T14:28:07","guid":{"rendered":"https:\/\/www.tomsguide.fr\/?p=1263768"},"modified":"2023-09-11T12:07:04","modified_gmt":"2023-09-11T10:07:04","slug":"des-etoiles-a-vitesse-supersonique-defient-les-lois-de-la-physique-en-quittant-notre-galaxie","status":"publish","type":"post","link":"https:\/\/www.tomsguide.fr\/des-etoiles-a-vitesse-supersonique-defient-les-lois-de-la-physique-en-quittant-notre-galaxie\/","title":{"rendered":"Des \u00e9toiles \u00e0 vitesse supersonique d\u00e9fient les lois de la physique en quittant notre galaxie"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1200\" height=\"800\" src=\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2023\/06\/etoiles-hyperveloces.jpg\" alt=\"\u00c9toiles hyperv\u00e9loces\" class=\"wp-image-1263797\" srcset=\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2023\/06\/etoiles-hyperveloces.jpg 1200w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2023\/06\/etoiles-hyperveloces-300x200.jpg 300w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2023\/06\/etoiles-hyperveloces-768x512.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><figcaption class=\"wp-element-caption\">\u00c9toiles (image libre d&#8217;illustration)<\/figcaption><\/figure>\n\n\n\n<p>La d\u00e9couverte r\u00e9cente, par le satellite GAIA, de<strong> six nouvelles \u00e9toiles dans la Voie lact\u00e9e<\/strong> a permis d&#8217;identifier <strong>l&#8217;objet le plus rapide<\/strong> jamais d\u00e9tect\u00e9 dans la galaxie. Deux de ces \u00e9toiles <strong>\u00e9tablissent m\u00eame des records<\/strong>, avec des vitesses radiales h\u00e9liocentriques plus rapides que celles jamais observ\u00e9es. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-les-etoiles-j1235-et-j0927-championnes-de-vitesse-dans-l-espace-intergalactique\">Les \u00e9toiles J1235 et J0927, championnes de vitesse dans l&#8217;espace intergalactique<\/h2>\n\n\n\n<p>Parmi ces nouvelles d\u00e9couvertes, <strong>quatre sont identifi\u00e9es comme des \u00e9toiles hyperv\u00e9loces<\/strong>, se d\u00e9pla\u00e7ant \u00e0 des vitesses d\u00e9passant la vitesse d&#8217;\u00e9chappement de la Voie lact\u00e9e (630 km\/s environ). L&#8217;\u00e9toile J1235 atteint une vitesse de <strong>1 694 kilom\u00e8tres par seconde<\/strong>, tandis que J0927 atteint une vitesse incroyable de<strong> 2 285 kilom\u00e8tres par seconde<\/strong>. \u00c0 titre de comparaison, la vitesse de la lumi\u00e8re est estim\u00e9e \u00e0 299 792 km\/s et l&#8217;objet le plus rapide cr\u00e9\u00e9 par l&#8217;homme est <a href=\"https:\/\/www.tomsguide.fr\/nasa-la-sonde-parker-solar-probe-a-touche-le-soleil-pour-la-premiere-fois\/\">la sonde de Parker, de la NASA, qui \u00e9volue \u00e0 environ 109 kilom\u00e8tres par seconde<\/a>.<\/p>\n\n\n\n<p> L&#8217;\u00e9quipe dirig\u00e9e par l&#8217;astrophysicien Kareem El-Badry, du Harvard-Smithsonian Center for Astrophysics, dit que ces \u00e9toiles soutiennent la th\u00e9orie de la \u00ab\u00a0double d\u00e9tonation \u00e0 double d\u00e9g\u00e9n\u00e9rescence dynamique \u00bb (D6). <\/p>\n\n\n\n<p>\u00c0 lire : <a href=\"https:\/\/www.tomsguide.fr\/fusion-de-deux-etoiles-a-neutrons-ce-jet-semblait-se-deplacer-7-fois-plus-vite-que-la-lumiere\/\">Fusion de deux \u00e9toiles \u00e0 neutrons : ce jet semblait se d\u00e9placer 7 fois plus vite que la lumi\u00e8re<\/a><\/p>\n\n\n\n<p>Cette th\u00e9orie explique les caract\u00e9ristiques des supernovae de type Ia, qui commencent par l&#8217;accr\u00e9tion de mati\u00e8re d&#8217;une \u00e9toile compagne par une naine blanche dans un syst\u00e8me binaire. Lorsque la masse limite de Chandrasekhar, d&#8217;environ 1,4 fois la masse solaire, est atteinte, <strong>une d\u00e9tonation thermonucl\u00e9aire se produit<\/strong>.<\/p>\n\n\n\n<p>Le sc\u00e9nario D6 propose un autre m\u00e9canisme : deux naines blanches en orbite l&#8217;une autour de l&#8217;autre s&#8217;\u00e9changent de la mati\u00e8re. Lorsque la mati\u00e8re riche en h\u00e9lium d&#8217;une des naines blanches est comprim\u00e9e et chauff\u00e9e, une d\u00e9tonation se produit \u00e0 la surface de l&#8217;\u00e9toile. Cette <strong>onde de choc<\/strong> atteint le c\u0153ur de l&#8217;\u00e9toile, d\u00e9clenchant une seconde d\u00e9tonation qui provoque une supernova, vaporisant compl\u00e8tement l&#8217;\u00e9toile. La naine blanche restante est alors <strong>propuls\u00e9e<\/strong> \u00e0 des vitesses hyperv\u00e9loces.<\/p>\n\n\n\n<p>Si un nombre significatif de supernovae de type Ia suivent le sc\u00e9nario D6, il est estim\u00e9 que notre galaxie a lanc\u00e9 plus de <strong>10 millions de ces \u00e9toiles dans l&#8217;espace intergalactique <\/strong>depuis sa formation.<\/p>\n\n\n\n<p><em>Source : <a href=\"https:\/\/arxiv.org\/abs\/2306.03914\">arXiv<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des \u00e9toiles hyperv\u00e9loces quittent la Voie lact\u00e9e \u00e0 des vitesses proches de celle de la lumi\u00e8re, r\u00e9v\u00e9lant un ph\u00e9nom\u00e8ne fascinant de l'univers. Leur \u00e9vasion spectaculaire d\u00e9fie les lois de la physique et suscite de nouvelles\u2026<\/p>","protected":false},"author":93,"featured_media":1263797,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[3872],"tags":[3368],"hubs":[],"acf":{"display_mode":"medium-img","post_show_excerpt":true,"post_show_in_home":false,"post_show_summary":false,"post_source":"","hide_sidebar":false,"hide_advertising":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Des \u00e9toiles \u00e0 vitesse supersonique d\u00e9fient les lois de la physique en quittant notre galaxie<\/title>\n<meta name=\"description\" content=\"Des \u00e9toiles hyperv\u00e9loces quittent la Voie lact\u00e9e \u00e0 des vitesses proches de celle de la lumi\u00e8re, r\u00e9v\u00e9lant un ph\u00e9nom\u00e8ne fascinant de l&#039;univers. 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