{"id":23019,"date":"2026-07-28T16:29:06","date_gmt":"2026-07-28T16:29:06","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=23019"},"modified":"2026-07-28T16:29:06","modified_gmt":"2026-07-28T16:29:06","slug":"letoile-compagnon-de-betelgeuse-se-devoile-un-peu-plus","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/07\/28\/letoile-compagnon-de-betelgeuse-se-devoile-un-peu-plus\/","title":{"rendered":"L&#8217;\u00e9toile compagnon de B\u00e9telgeuse se d\u00e9voile un peu plus"},"content":{"rendered":"<p><strong>Gr\u00e2ce au VLT, les astronomes disposent d&#8217;une nouvelle image du compagnon de B\u00e9telgeuse, la c\u00e9l\u00e8bre \u00e9toile superg\u00e9ante rouge.<\/strong><\/p>\n<h5>Vedette impr\u00e9visible :<\/h5>\n<p>S\u2019il y a une \u00e9toile que tout le monde conna\u00eet, c\u2019est bien B\u00e9telgeuse. Celle qui symbolise l\u2019\u00e9paule du\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/05\/10\/a-pompei-une-mosaique-illustre-le-mythe-dorion-et-du-scorpion\/\" target=\"_blank\" rel=\"noopener\">chasseur Orion<\/a> fait en effet r\u00e9guli\u00e8rement parler d\u2019elle. On pense en particulier \u00e0\u00a0son\u00a0<a href=\"https:\/\/www.futura-sciences.com\/sciences\/breves\/etoile-baisse-luminosite-betelgeuse-haute-resolution-comme-vous-ne-avez-jamais-vue-8893\/\" target=\"_blank\" rel=\"noopener\">grand obscurcissement<\/a> en 2019-2020. Le ph\u00e9nom\u00e8ne a depuis \u00e9t\u00e9 expliqu\u00e9 par les astrophysiciens <a href=\"https:\/\/x.com\/EricLagadec\" target=\"_blank\" rel=\"noopener\">\u00c9ric Lagadec<\/a> et <a href=\"https:\/\/lira.obspm.fr\/perso\/miguel-montarges\/\" target=\"_blank\" rel=\"noopener\">Miguel Montarg\u00e8s<\/a> :<\/p>\n<p><iframe loading=\"lazy\" title=\"LA V\u00c9RIT\u00c9 SUR B\u00c9TELGEUSE \ud83d\udca5- feat. Miguel Montarg\u00e8s et Eric Lagadec\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/lE5zQsGUXbI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Cet astre intriguant devrait m\u00eame finir par exploser en\u00a0<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-supernova-60\/\" target=\"_blank\" rel=\"noopener\">supernova<\/a>, devenant alors visible en plein jour ! Quand ? Cela, personne ne peut le pr\u00e9voir. Peut-\u00eatre la nuit prochaine, ou dans cent mille ans&#8230; Une chose est s\u00fbre, c\u2019est que les sautes d\u2019humeur de cette <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Superg%C3%A9ante_rouge\" target=\"_blank\" rel=\"noopener\">superg\u00e9ante rouge<\/a> sont connues depuis longtemps. On en trouve par exemple la trace dans les r\u00e9cits des Aborig\u00e8nes d\u2019Australie (\u00e0 lire sur <a href=\"https:\/\/arxiv.org\/abs\/1808.01862\" target=\"_blank\" rel=\"noopener noreferrer\">arXiv<\/a>) :<\/p>\n<figure id=\"attachment_18733\" aria-describedby=\"caption-attachment-18733\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse.jpg\" rel=\"lightbox[23019]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-18733\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/12\/betelgeuse.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18733\" class=\"wp-caption-text\">B\u00e9telgeuse est l&#8217;une des principales \u00e9toiles de la constellation d&#8217;Orion. \u00a9 CIELMANIA<\/figcaption><\/figure>\n<p><!--more--><\/p>\n<h5>Un discret compagnon :<\/h5>\n<p>Il y a un an, le <a href=\"https:\/\/noirlab.edu\/public\/news\/noirlab2523\/\" target=\"_blank\" rel=\"noopener\">t\u00e9lescope Gemini Nord<\/a> d\u00e9voilait la premi\u00e8re image d&#8217;une discr\u00e8te \u00e9toile en orbite autour de B\u00e9telgeuse. Les astronomes estimaient que ce compagnon, environ cent fois moins brillant que B\u00e9telgeuse, est une tr\u00e8s jeune \u00e9toile. Un peu plus grosse que le <a href=\"https:\/\/cnes.fr\/dossiers\/soleil\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>, elle met six ans \u00e0 faire le tour de la superg\u00e9ante rouge. Irr\u00e9sistiblement attir\u00e9e par sa voisine beaucoup plus massive, l&#8217;\u00e9toile compagnon devrait fusionner avec elle d\u2019ici dix mille ans :<\/p>\n<figure id=\"attachment_21379\" aria-describedby=\"caption-attachment-21379\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/07\/betelgeuse2.jpg\" rel=\"lightbox[23019]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-21379\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/07\/betelgeuse2-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/07\/betelgeuse2-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/07\/betelgeuse2-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/07\/betelgeuse2.jpg 700w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-21379\" class=\"wp-caption-text\">Le discret compagnon de B\u00e9telgeuse imag\u00e9 pour la premi\u00e8re fois en 2025 par le t\u00e9lescope Gemini Nord. \u00a9 Gemini Observatory\/NOIRLab\/NSF\/AURA<\/figcaption><\/figure>\n<p>Cette fois, c&#8217;est le <a href=\"https:\/\/www.eso.org\/public\/france\/teles-instr\/paranal-observatory\/vlt\/\" target=\"_blank\" rel=\"noopener\">Very Large Telescope<\/a> (le grand t\u00e9lescope de l&#8217;<a href=\"https:\/\/www.eso.org\/public\/france\/\" target=\"_blank\" rel=\"noopener\">ESO<\/a> au Chili) qui vient d&#8217;immortaliser ce syst\u00e8me (stellaire) binaire. L\u2019image a \u00e9t\u00e9 obtenue gr\u00e2ce \u00e0 l&#8217;instrument <a href=\"https:\/\/fr.wikipedia.org\/wiki\/SPHERE\" target=\"_blank\" rel=\"noopener\">SPHERE<\/a> ( Spectro-Polarim\u00e8tre \u00e0 Haut contraste destin\u00e9 \u00e0 la REcherche d&#8217;Exoplan\u00e8tes)\u00a0:<\/p>\n<figure id=\"attachment_23021\" aria-describedby=\"caption-attachment-23021\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/07\/betel2.jpg\" rel=\"lightbox[23019]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-23021\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/07\/betel2-450x253.jpg\" alt=\"\" width=\"450\" height=\"253\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/07\/betel2-450x253.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/07\/betel2-1024x576.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/07\/betel2-768x432.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/07\/betel2.jpg 1366w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-23021\" class=\"wp-caption-text\">B\u00e9telgeuse et de son compagnon prises par le VLT (Cr\u00e9dit: ESO\/M. Montarg\u00e8s et al.)<\/figcaption><\/figure>\n<p>Pour en savoir plus, lisez le <a href=\"https:\/\/observatoiredeparis.psl.eu\/la-preuve-par-l-image.html\" target=\"_blank\" rel=\"noopener\">communiqu\u00e9 de l&#8217;Observatoire de Paris<\/a> et le <a href=\"https:\/\/www.eso.org\/public\/france\/news\/eso2611\/?lang\" target=\"_blank\" rel=\"noopener\">communiqu\u00e9 de l&#8217;ESO<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/13\/betelgeuse-une-occultation-riche-en-surprises\/\" target=\"_blank\" rel=\"noopener\">B\u00e9telgeuse : une occultation riche en surprises<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/16\/conseils-realisez-votre-premiere-photo-de-la-nebuleuse-dorion\/\" target=\"_blank\" rel=\"noopener\">Comment r\u00e9aliser votre premi\u00e8re photo de la n\u00e9buleuse d\u2019Orion<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/05\/la-constellation-dorion-se-couche-depuis-les-iles-andaman\/\" target=\"_blank\" rel=\"noopener\">La constellation d\u2019Orion se couche depuis les \u00eeles Andaman<\/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>.<\/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>Gr\u00e2ce au VLT, les astronomes disposent d&#8217;une nouvelle image du compagnon de B\u00e9telgeuse, la c\u00e9l\u00e8bre \u00e9toile superg\u00e9ante rouge. Vedette impr\u00e9visible : S\u2019il y a une \u00e9toile que tout le monde conna\u00eet, c\u2019est bien B\u00e9telgeuse. Celle qui symbolise l\u2019\u00e9paule du\u00a0chasseur Orion fait en effet r\u00e9guli\u00e8rement parler d\u2019elle. On pense en particulier \u00e0\u00a0son\u00a0grand obscurcissement en 2019-2020. Le &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/07\/28\/letoile-compagnon-de-betelgeuse-se-devoile-un-peu-plus\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">L&#8217;\u00e9toile compagnon de B\u00e9telgeuse se d\u00e9voile un peu plus<\/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":23020,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[344,354,3992,633,3495,1188,637],"class_list":["post-23019","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-betelgeuse","tag-constellation-dorion","tag-eric-lagadec","tag-eso","tag-miguel-montarges","tag-sphere","tag-vlt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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