{"id":26156,"date":"2024-08-21T12:00:50","date_gmt":"2024-08-21T10:00:50","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=26156"},"modified":"2024-07-23T13:02:25","modified_gmt":"2024-07-23T11:02:25","slug":"le-telescope-james-webb-a-peut-etre-decouvert-une-planete-ocean","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-james-webb-a-peut-etre-decouvert-une-planete-ocean\/","title":{"rendered":"Le t\u00e9lescope James Webb a peut-\u00eatre d\u00e9couvert une plan\u00e8te oc\u00e9an"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Des chercheurs du CNRS et de l\u2019universit\u00e9 de Montr\u00e9al ont scrut\u00e9 une exoplan\u00e8te \u00e0 48 ann\u00e9es-lumi\u00e8re pour y d\u00e9celer de l\u2019eau liquide, et peut-\u00eatre m\u00eame en grande quantit\u00e9. Elle se situe dans une \u00ab zone habitable \u00bb, la plus prometteuse dans notre recherche d\u2019eau liquide jusqu\u2019\u00e0 pr\u00e9sent.<\/p>\n<p>Martin Turbet ne cache pas son enthousiasme au t\u00e9l\u00e9phone. \u00ab 10 \u00e0 20 % de la masse de l\u2019exoplan\u00e8te LHS1140b serait constitu\u00e9e d\u2019eau. Imaginez un peu, \u00e0 c\u00f4t\u00e9, la Terre, c\u2019est 0,02 % \u00bb, souffle le chercheur du CNRS. Avec des coll\u00e8gues de l\u2019universit\u00e9 de Montr\u00e9al, il a d\u00e9couvert qu\u2019une plan\u00e8te en dehors du syst\u00e8me solaire, connue depuis 2017 sous le nom de LHS1140b, contient tr\u00e8s probablement de l\u2019eau sous forme liquide, un des \u00e9l\u00e9ments n\u00e9cessaires au d\u00e9veloppement de la vie.<\/p>\n<p>Prochainement publi\u00e9e dans la revue The Astrophysical Journal Letters, cette \u00e9tude a \u00e9t\u00e9 rendue possible par le t\u00e9lescope spatial le plus puissant jamais construit, James Webb. C\u2019est lui qui a permis de d\u00e9tecter la pr\u00e9sence d\u2019eau, en tranchant entre deux hypoth\u00e8ses jusqu\u2019\u00e0 pr\u00e9sent privil\u00e9gi\u00e9es par les chercheurs. Gr\u00e2ce \u00e0 d\u2019autres t\u00e9lescopes comme Hubble, les scientifiques avaient constat\u00e9 que cette plan\u00e8te, qui mesure 1,7 fois la taille de la Terre, poss\u00e9dait une densit\u00e9 assez faible. Mais le Hubble, bien moins puissant que le James Webb, n\u2019avait pas permis aux scientifiques de d\u00e9terminer l\u2019hypoth\u00e8se la plus probable : soit il y avait une atmosph\u00e8re dense en hydrog\u00e8ne et en h\u00e9lium, soit il y avait beaucoup d\u2019eau.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p>Une zone habitable mais sans certitude de vie<br \/>\nLe r\u00e9sultat, on le conna\u00eet d\u00e9sormais. Mais un autre param\u00e8tre a aussi permis de savoir si cette possible eau \u00e9tait solide ou liquide. \u00ab L\u2019eau est assez abondante dans l\u2019univers sous forme de glace. En revanche, il est tr\u00e8s difficile de la trouver sous forme liquide \u00bb, explique Benjamin Charnay, \u00e9galement chercheur au CNRS et impliqu\u00e9 dans cette \u00e9tude. C\u2019est en observant la distance entre l\u2019\u00e9toile et sa plan\u00e8te, qui se situe dans la \u00ab zone habitable \u00bb, que les scientifiques ont pu confirmer la pr\u00e9sence d\u2019eau liquide.<\/p>\n<p>\u00ab Mais zone habitable ne veut pas dire automatiquement possibilit\u00e9 d\u2019une vie extraterrestre ; il faut aussi d\u2019autres crit\u00e8res comme la pr\u00e9sence de lumi\u00e8re, ou de nutriments tel le carbone \u00bb, sourit Martin Turbet.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"26157\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-james-webb-a-peut-etre-decouvert-une-planete-ocean\/exoplanete-ocean-3\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?fit=1024%2C1024&amp;ssl=1\" data-orig-size=\"1024,1024\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"exoplanete ocean\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?fit=800%2C800&amp;ssl=1\" class=\"alignnone size-full wp-image-26157\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?resize=1024%2C1024&#038;ssl=1\" alt=\"\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?w=1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?resize=800%2C800&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?resize=144%2C144&amp;ssl=1 144w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Source : <a href=\"https:\/\/www.leparisien.fr\/sciences\/espace-une-planete-ocean-a-peut-etre-ete-decouverte-grace-au-telescope-james-webb-09-07-2024-MLRZTILLBFDVRJ5KKXM3YPFNRU.php\" target=\"_blank\" rel=\"noopener\">https:\/\/www.leparisien.fr\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"26156\">(180)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Des chercheurs du CNRS et de l\u2019universit\u00e9 de Montr\u00e9al ont scrut\u00e9 une exoplan\u00e8te \u00e0 48 ann\u00e9es-lumi\u00e8re pour y d\u00e9celer de&#8230;<\/p>\n","protected":false},"author":1,"featured_media":26157,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[22],"tags":[1947,241,121],"class_list":["post-26156","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-espace","tag-james-webb","tag-ocean","tag-planete","wpcat-22-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/07\/exoplanete-ocean.jpg?fit=1024%2C1024&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-6NS","jetpack-related-posts":[{"id":24340,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-probable-planete-ocean\/","url_meta":{"origin":26156,"position":0},"title":"D\u00e9couverte d&rsquo;une probable plan\u00e8te oc\u00e9an","author":"Admin","date":"27 ao\u00fbt 2022","format":false,"excerpt":"Elle serait ainsi enti\u00e8rement recouverte d'une \u00e9paisse couche d'eau. Si on sait que l\u2019eau liquide est essentielle au d\u00e9veloppement de la vie, il est beaucoup trop t\u00f4t pour se prononcer sur la potentielle pr\u00e9sence de vie sur cette exoplan\u00e8te. TOI-1452 b est une exoplan\u00e8te en orbite autour d'une des deux\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-ocean.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-ocean.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-ocean.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-ocean.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-ocean.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":25249,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-james-webb-decouvre-du-methane-et-du-dioxyde-de-carbone-dans-latmosphere-de-k2-18-b\/","url_meta":{"origin":26156,"position":1},"title":"Le t\u00e9lescope James Webb d\u00e9couvre du m\u00e9thane et du dioxyde de carbone dans l&rsquo;atmosph\u00e8re de K2-18 b","author":"Admin","date":"27 septembre 2023","format":false,"excerpt":"Une nouvelle observation de K2-18 b, une exoplan\u00e8te 8,6 fois plus massive que la Terre, par le t\u00e9lescope spatial James Webb de la NASA a r\u00e9v\u00e9l\u00e9 la pr\u00e9sence de mol\u00e9cules contenant du carbone, notamment du m\u00e9thane et du dioxyde de carbone. La d\u00e9couverte de M. Webb vient s'ajouter \u00e0 de\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2023\/09\/exoplanete-K2-18b.jpg?fit=985%2C554&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":26520,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-nasa-a-decouvert-une-planete-plus-imposante-que-la-terre-avec-un-gaz-qui-nest-produit-que-par-la-vie\/","url_meta":{"origin":26156,"position":2},"title":"La NASA a d\u00e9couvert une plan\u00e8te plus imposante que la Terre avec un gaz qui n&rsquo;est produit que par la vie","author":"Admin","date":"10 janvier 2025","format":false,"excerpt":"La NASA a d\u00e9couvert une plan\u00e8te plus grande que la Terre, accompagn\u00e9e d'un gaz \u00ab uniquement produit par la vie \u00bb. Alors que l'agence spatiale continue de faire d'incroyables d\u00e9couvertes dans notre syst\u00e8me solaire, l'une d'entre elles, datant de 2023, est toujours aussi impressionnante. Cette d\u00e9couverte a \u00e9t\u00e9 r\u00e9alis\u00e9e gr\u00e2ce\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete.jpg?fit=1024%2C1024&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete.jpg?fit=1024%2C1024&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2025\/01\/exoplanete.jpg?fit=1024%2C1024&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":329,"url":"https:\/\/www.laterredufutur.com\/accueil\/exoplanete-potentiellement-habitable\/","url_meta":{"origin":26156,"position":3},"title":"Une exoplan\u00e8te potentiellement habitable d\u00e9couverte","author":"Admin","date":"26 mai 2011","format":false,"excerpt":"Une des plan\u00e8tes tournant autour de l\u2019\u00e9toile naine Gliese 581 pourrait s\u2019av\u00e9rer \"habitable\"\u00a0avec un climat propice \u00e0 la pr\u00e9sence d\u2019eau liquide et \u00e0 la vie, selon une \u00e9tude que vient de publier une \u00e9quipe de climatologues. Sept fois plus massive que la Terre et vraisemblablement rocheuse, Gliese 581d \"pourrait devenir\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/05\/gliese581.jpg?fit=300%2C216&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":24289,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-james-webb-vient-de-prouver-quil-peut-detecter-des-signes-de-vie-dans-les-atmospheres-des-planetes-et-exoplanetes\/","url_meta":{"origin":26156,"position":4},"title":"Le t\u00e9lescope James Webb vient de prouver qu&rsquo;il peut d\u00e9tecter des signes de vie dans les atmosph\u00e8res des plan\u00e8tes et exoplan\u00e8tes","author":"Admin","date":"11 ao\u00fbt 2022","format":false,"excerpt":"Les ingr\u00e9dients de la vie sont r\u00e9partis dans l'Univers. Si la Terre est le seul endroit connu de l'Univers o\u00f9 la vie est pr\u00e9sente, la d\u00e9tection de la vie au-del\u00e0 de la Terre est un objectif majeur de l'astronomie moderne et de la science plan\u00e9taire. Nous sommes deux scientifiques \u00e0\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-trappist.jpg?fit=1024%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-trappist.jpg?fit=1024%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-trappist.jpg?fit=1024%2C415&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/08\/exoplanete-trappist.jpg?fit=1024%2C415&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":25867,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-telescope-webb-decouvre-une-nouvelle-exoplanete-potentiellement-habitable-k2-18b\/","url_meta":{"origin":26156,"position":5},"title":"Le t\u00e9lescope Webb d\u00e9couvre une nouvelle exoplan\u00e8te potentiellement habitable K2-18b","author":"Admin","date":"15 mai 2024","format":false,"excerpt":"Des rapports r\u00e9cents de la NASA, c'est le T\u00e9lescope spatial James Webb qui aurait trouv\u00e9 des signes de vie sur une plan\u00e8te lointaine, et cela a naturellement suscit\u00e9 l\u2019enthousiasme. Cependant, une nouvelle \u00e9tude remet en question cette d\u00e9couverte, mais explique \u00e9galement comment le t\u00e9lescope pourrait v\u00e9rifier la pr\u00e9sence du gaz\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/05\/exoplanete-K2-18b.jpg?fit=526%2C510&ssl=1&resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=26156"}],"version-history":[{"count":2,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26156\/revisions"}],"predecessor-version":[{"id":26159,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/26156\/revisions\/26159"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/26157"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=26156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=26156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=26156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}