{"id":20719,"date":"2025-01-29T17:32:28","date_gmt":"2025-01-29T17:32:28","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=20719"},"modified":"2025-02-15T17:53:05","modified_gmt":"2025-02-15T17:53:05","slug":"les-exocometes-sont-nombreuses-autour-des-etoiles","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/29\/les-exocometes-sont-nombreuses-autour-des-etoiles\/","title":{"rendered":"Les exocom\u00e8tes sont nombreuses autour des \u00e9toiles"},"content":{"rendered":"<p><strong>Une nouvelle \u00e9tude vient confirmer la pr\u00e9sence fr\u00e9quente de ceintures d&#8217;exocom\u00e8tes autour d&#8217;\u00e9toiles proches.<\/strong><\/p>\n<h5>R\u00e9servoirs de com\u00e8tes :<\/h5>\n<p>Les astronomes s&#8217;en doutaient un peu : ce que l&#8217;on trouve dans la banlieue du Soleil s&#8217;observe \u00e9galement autour d&#8217;autres \u00e9toiles. On l&#8217;avait d\u00e9j\u00e0 constat\u00e9 avec les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/04\/au-chili-linstrument-nirps-va-traquer-les-exoplanetes\/\" target=\"_blank\" rel=\"noopener\">exoplan\u00e8tes<\/a>, on l&#8217;observe \u00e9galement avec les exocom\u00e8tes. Dans le Syst\u00e8me solaire, on conna\u00eet deux cat\u00e9gories de com\u00e8tes. Celles \u00e0 courte p\u00e9riode inf\u00e9rieure \u00e0 200 ans, et celles \u00e0 longue p\u00e9riode de plus de 200 ans. Deux familles d&#8217;astres chevelus issus de deux r\u00e9servoirs distincts : la ceinture de Kuiper et le nuage d\u2019Oort (imagin\u00e9s par les astronomes <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/23\/gerard-kuiper-une-passion-pour-le-systeme-solaire\/\" target=\"_blank\" rel=\"noopener\">Gerard Kuiper<\/a> et <a href=\"https:\/\/www.balzan.org\/fr\/laureats\/jan-hendrik-oort\/bio-bibliografia\" target=\"_blank\" rel=\"noopener\">Jan Oort<\/a>).<\/p>\n<figure id=\"attachment_10008\" aria-describedby=\"caption-attachment-10008\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/12\/kuiper.jpg\" rel=\"lightbox[20719]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-10008\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/12\/kuiper-450x280.jpg\" alt=\"\" width=\"450\" height=\"280\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/12\/kuiper-450x280.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/12\/kuiper-768x477.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/12\/kuiper-1024x636.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/12\/kuiper.jpg 1450w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-10008\" class=\"wp-caption-text\">L\u2019astronome Gerard Kuiper (1905-1973) se consacra \u00e0 l&#8217;\u00e9tude du Syst\u00e8me solaire. \u00a9 NASA<\/figcaption><\/figure>\n<p>La ceinture de Kuiper, situ\u00e9e au-del\u00e0 de l\u2019orbite de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/07\/hippocampe-la-petite-lune-de-neptune-qui-nest-pas-a-sa-place\/\" target=\"_blank\" rel=\"noopener\">Neptune<\/a>, regroupe les com\u00e8tes \u00e0 courte p\u00e9riode. Le nuage de Oort, qui rassemble les com\u00e8tes \u00e0 longue p\u00e9riode, s&#8217;\u00e9tend bien plus loin, entre 30.000 et 100.000 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-unite-astronomique-63\/\" target=\"_blank\" rel=\"noopener\">unit\u00e9s astronomiques<\/a>. Depuis quelques ann\u00e9es, on a d\u00e9couvert des ceintures identiques autour d&#8217;autres \u00e9toiles.<\/p>\n<p><!--more--><\/p>\n<h5>Ceintures d&#8217;astres chevelus :<\/h5>\n<p>En 2022, les donn\u00e9es du satellite <a href=\"https:\/\/www.iap.fr\/actualites\/laune\/2022\/Exocometes\/exocometes-fr.html\" target=\"_blank\" rel=\"noopener\">TESS<\/a> avaient d\u00e9j\u00e0 r\u00e9v\u00e9l\u00e9 l&#8217;existence d&#8217;une trentaine d&#8217;exocom\u00e8tes autour de l&#8217;\u00e9toile <a href=\"https:\/\/www.cnrs.fr\/fr\/presse\/exoplanetes-le-systeme-beta-pictoris-se-devoile\" target=\"_blank\" rel=\"noopener\">\u03b2 Pictoris<\/a>. Une nouvelle \u00e9tude, publi\u00e9e par l&#8217;<a href=\"https:\/\/www.iac.es\/es\/divulgacion\/noticias\/un-estudio-sin-precedentes-revela-la-estructura-de-74-cinturones-de-exocometas-alrededor-de-estrellas\" target=\"_blank\" rel=\"noopener\">IAC<\/a>, confirme que ces petits corps glac\u00e9s se retrouvent en grand nombre autour des \u00e9toiles. En combinant les donn\u00e9es r\u00e9colt\u00e9es par les antennes des r\u00e9seaux <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/09\/18\/alma-portrait-dun-radiotelescope-geant-sous-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">ALMA<\/a> (Chili) et <a href=\"https:\/\/lweb.cfa.harvard.edu\/sma\/\" target=\"_blank\" rel=\"noopener\">SMA<\/a> (Hawa\u00ef), les chercheurs ont pu reconstituer des ceintures de com\u00e8tes autour de 74 \u00e9toiles :<\/p>\n<figure id=\"attachment_20720\" aria-describedby=\"caption-attachment-20720\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/exocomet.jpg\" rel=\"lightbox[20719]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-20720 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/exocomet-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/exocomet-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/exocomet-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/exocomet-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/01\/exocomet.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-20720\" class=\"wp-caption-text\">Autour des \u00e9toiles proches, les disques d&#8217;exocom\u00e8tes sont tr\u00e8s courants. \u00a9 IAC\/ULL<\/figcaption><\/figure>\n<p>La vari\u00e9t\u00e9 de ces ceintures, toutes situ\u00e9es autour d&#8217;\u00e9toiles assez proches de nous, est \u00e9tonnante. Certaines sont \u00e9troites, comme la ceinture de Kuiper, d&#8217;autres s&#8217;apparentent \u00e0 de larges disques. L&#8217;\u00e9tude vient confirmer l&#8217;id\u00e9e que les processus observ\u00e9s dans le Syst\u00e8me solaire sont courants dans l&#8217;Univers.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/03\/14\/splendeurs-dans-le-sillage-de-la-comete-12p-pons-brooks\/\" target=\"_blank\" rel=\"noopener\">Splendeurs dans le sillage de la com\u00e8te 12P\/Pons-Brooks<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/02\/la-comete-nishimura-assaillie-par-le-vent-solaire\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te Nishimura assaillie par le vent solaire<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/08\/04\/en-video-un-morceau-de-comete-se-desintegre\/\" target=\"_blank\" rel=\"noopener\">En vid\u00e9o : un morceau de com\u00e8te se d\u00e9sint\u00e8gre<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Une nouvelle \u00e9tude vient confirmer la pr\u00e9sence fr\u00e9quente de ceintures d&#8217;exocom\u00e8tes autour d&#8217;\u00e9toiles proches. R\u00e9servoirs de com\u00e8tes : Les astronomes s&#8217;en doutaient un peu : ce que l&#8217;on trouve dans la banlieue du Soleil s&#8217;observe \u00e9galement autour d&#8217;autres \u00e9toiles. On l&#8217;avait d\u00e9j\u00e0 constat\u00e9 avec les exoplan\u00e8tes, on l&#8217;observe \u00e9galement avec les exocom\u00e8tes. Dans le Syst\u00e8me &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/01\/29\/les-exocometes-sont-nombreuses-autour-des-etoiles\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Les exocom\u00e8tes sont nombreuses autour des \u00e9toiles<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":20720,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1048,3705,2608,2740,3708,3707,3706],"class_list":["post-20719","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-alma","tag-exocometes","tag-gerard-kuiper","tag-iac","tag-jan-oort","tag-sma","tag--pictoris"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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