{"id":20333,"date":"2023-10-16T20:13:59","date_gmt":"2023-10-16T20:13:59","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/une-impressionnante-collision-entre-deux-planetes-de-glace-a-provoque-des-effets-lumineux-inedits"},"modified":"2023-10-17T12:09:33","modified_gmt":"2023-10-17T12:09:33","slug":"une-impressionnante-collision-entre-deux-planetes-de-glace-a-provoque-des-effets-lumineux-inedits","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/une-impressionnante-collision-entre-deux-planetes-de-glace-a-provoque-des-effets-lumineux-inedits","title":{"rendered":"Une impressionnante collision entre deux plan\u00e8tes de glace a provoqu\u00e9 des effets lumineux in\u00e9dits"},"content":{"rendered":"

Africa-Press – Madagascar. <\/strong><\/span>C\u2019est la myste\u0301rieuse courbe de lumie\u0300re d\u2019une e\u0301toile qui a e\u0301veille\u0301 l\u2019inte\u0301re\u0302t des spe\u0301cialistes : 900 jours apre\u0300s avoir double\u0301 de luminosite\u0301 dans les infrarouges, sa lumie\u0300re a commence\u0301 a\u0300 s\u2019estomper dans le spectre visible. Aucun astre connu n\u2019avait de\u0301ja\u0300 affiche\u0301 un tel profil. Si bien qu\u2019une enque\u0302te astronomique, impliquant plusieurs te\u0301lescopes, a e\u0301te\u0301 mise en place pour avoir le fin mot de l\u2019histoire. Et elle a fini par re\u0301ve\u0301ler un e\u0301ve\u0300nement encore jamais observe\u0301 jusqu\u2019ici.<\/p>\n

Un jeune syste\u0300me stellaire<\/b><\/p>\n

L\u2019e\u0301toile en question est de\u0301nomme\u0301e ASASSN-21qj (son de\u0301clin a e\u0301te\u0301 observe\u0301 pour la premie\u0300re fois par le re\u0301seau du All Sky Automated Survey for SuperNovae). C\u2019est un astre jeune, similaire au Soleil, a\u0302ge\u0301 de seulement 300 millions d\u2019anne\u0301es qui brille dans la constellation de la Poupe a\u0300 1850 anne\u0301es-lumie\u0300re.<\/p>\n

En de\u0301cembre 2021, son e\u0301clat a soudainement pa\u0302li dans le spectre visible, ce que les astronomes nomment une e\u0301clipse optique. Celle-ci e\u0301tait particulie\u0300rement complexe et variable en fonction des longueurs d\u2019ondes observe\u0301es. Le phe\u0301nome\u0300ne a dure\u0301 500 jours et il a e\u0301te\u0301 suivi par l\u2019Observatoire de Las Cumbres, en Californie et l\u2019e\u0301toile a e\u0301galement pu e\u0302tre observe\u0301e, en septembre 2022, par une e\u0301quipe d\u2019astronomes amateurs franc\u0327ais, 2SPOT, qui pilote a\u0300 distance un petit observatoire implante\u0301 au Chili et qui compte deux te\u0301lescopes. Elle a obtenu un spectre de l\u2019e\u0301toile qui a permis de comprendre qu\u2019il s\u2019agissait d\u2019un astre similaire au Soleil. Ce travail est mentionne\u0301 dans la publication scientifique qui est parue dans la revue Nature.<\/p>\n

En remontant dans les donne\u0301es du te\u0301lescope spatial NEOWISE, les astronomes ont constate\u0301 que 900 jours avant, l\u2019engin avait enregistre\u0301 une hausse de luminosite\u0301 dans les infrarouges qui s\u2019est prolonge\u0301e durant 1000 jours, donc me\u0302me apre\u0300s le de\u0301but de l\u2019e\u0301clipse. Ils ont d\u2019abord explore\u0301 l\u2019ide\u0301e qu\u2019il s\u2019agissait la\u0300 de deux e\u0301ve\u0300nements inde\u0301pendants mais rien ne collait vraiment avec cette hypothe\u0300se.<\/p>\n

Choc entre deux mini-Neptunes<\/b><\/p>\n

Finalement, ils ont compris qu\u2019ils e\u0301taient en face d\u2019un seul et me\u0302me e\u0301ve\u0300nement qui s\u2019est prolonge\u0301 dans le temps : une collision entre deux ge\u0301antes de glace, probablement des mini-Neptunes, de quelques dizaines de masses terrestres chacune et situe\u0301es entre 2 et 16 unite\u0301s astronomiques de l\u2019e\u0301toile. Le choc a ge\u0301ne\u0301re\u0301 la lueur initiale : \u201cnos calculs et nos mode\u0300les informatiques indiquent que la tempe\u0301rature et la taille du mate\u0301riau incandescent ainsi que la dure\u0301e de la lueur sont cohe\u0301rents avec la collision de deux exoplane\u0300tes ge\u0301antes de glace\u201d, souligne Simon Lock, de l\u2019Universite\u0301 de Bristol, un des auteurs de l\u2019e\u0301tude.<\/p>\n

Le nuage de de\u0301bris en expansion re\u0301sultant de l\u2019impact s\u2019est ensuite de\u0301place\u0301 devant l\u2019e\u0301toile environ trois ans plus tard, provoquant une baisse de sa luminosite\u0301 dans les longueurs d\u2019onde visibles. Celui-ci devrait commencer a\u0300 se disperser sur l\u2019orbite de l\u2019objet re\u0301sultant de la collision et il devrait laisser plus de lumie\u0300re filtrer. Elle pourra e\u0302tre recueillie par les te\u0301lescopes au sol et analyse\u0301e afin d\u2019en savoir plus sur la composition des de\u0301bris. Enfin, avec le te\u0301lescope James Webb, les astronomes espe\u0300rent pouvoir obtenir des informations sur l\u2019objet qui s\u2019est forme\u0301 suite a\u0300 cette collision. A terme, toute la poussie\u0300re e\u0301jecte\u0301e lors de l\u2019impact pourrait former, autour de ce dernier, un corte\u0300ge de Lunes.<\/p>\n

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

Africa-Press – Madagascar. C\u2019est la myste\u0301rieuse courbe de lumie\u0300re d\u2019une e\u0301toile qui a e\u0301veille\u0301 l\u2019inte\u0301re\u0302t des spe\u0301cialistes : 900 jours apre\u0300s avoir double\u0301 de luminosite\u0301 dans les infrarouges, sa lumie\u0300re a commence\u0301 a\u0300 s\u2019estomper dans le spectre visible. Aucun astre connu n\u2019avait de\u0301ja\u0300 affiche\u0301 un tel profil. Si bien qu\u2019une enque\u0302te astronomique, impliquant plusieurs te\u0301lescopes, […]<\/p>\n","protected":false},"author":82,"featured_media":20332,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,49],"class_list":["post-20333","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-madagascar","tag-madagascar"],"yoast_head":"\nUne impressionnante collision entre deux plan\u00e8tes de glace a provoqu\u00e9 des effets lumineux in\u00e9dits - Madagascar<\/title>\n<meta name=\"description\" content=\"C\u2019est la myste\u0301rieuse courbe de lumie\u0300re d\u2019une e\u0301toile qui a e\u0301veille\u0301 l\u2019inte\u0301re\u0302t des spe\u0301cialistes : 900 jours apre\u0300s ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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