{"id":15182,"date":"2023-07-11T16:32:29","date_gmt":"2023-07-11T16:32:29","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/decouverte-dune-exoplanete-recouverte-de-nuages-de-metal-aussi-brillante-quun-miroir"},"modified":"2023-07-11T17:06:48","modified_gmt":"2023-07-11T17:06:48","slug":"decouverte-dune-exoplanete-recouverte-de-nuages-de-metal-aussi-brillante-quun-miroir","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/decouverte-dune-exoplanete-recouverte-de-nuages-de-metal-aussi-brillante-quun-miroir","title":{"rendered":"D\u00e9couverte d’une exoplan\u00e8te recouverte de nuages de m\u00e9tal, aussi brillante qu’un miroir"},"content":{"rendered":"

Africa-Press – Djibouti. <\/strong><\/span>J’aime les nuages… les nuages qui passent… la\u0300-bas… la\u0300-bas… les merveilleux nuages !\u00a0\u00bb, e\u0301crivait Charles Baudelaire (Petits poe\u0300mes en prose, 1869). Alors, que lui aurait inspire\u0301 l\u2019existence de la plane\u0300te LTT 9779 b ? Cette \u00ab\u00a0Neptune chaude\u00a0\u00bb, observe\u0301e a\u0300 264 anne\u0301es-lumie\u0300re de la Terre, serait recouverte d\u2019e\u0301pais nuages de silicates me\u0302le\u0301s a\u0300 du me\u0301tal comme le titane. Cette sorte de carapace fait d’elle le plus grand miroir jamais observe\u0301 dans l\u2019Univers : la plane\u0300te, de 4,5 fois le rayon de la Terre, refle\u0300te 80 % de la lumie\u0300re rec\u0327ue de son e\u0301toile. En comparaison, notre plane\u0300te ne renvoie que 30 % de la lumie\u0300re du Soleil. La mesure de cet albe\u0301do a e\u0301te\u0301 obtenu a\u0300 partir des donne\u0301es de l\u2019instrument Cheops (CHaracterising ExOPlanet Satellite), lance\u0301 par l\u2019Agence spatiale europe\u0301enne (ESA) en de\u0301cembre 2019. Ces travaux font l\u2019objet d\u2019un article paru dans la revue Astronomy & Astrophysics.<\/p>\n

Une plane\u0300te qui ne devrait pas exister<\/b><\/p>\n

LTT 9779 b orbite pre\u0300s de son e\u0301toile, dont elle fait le tour en seulement 19 heures. Cette proximite\u0301 fait qu\u2019elle est chauffe\u0301e a\u0300 2000\u00b0C ! Un ve\u0301ritable enfer… qui ne devrait pas exister, comme l\u2019explique a\u0300 Sciences et Avenir Vivien Parmentier, astrophysicien a\u0300 l\u2019observatoire de la Co\u0302te d\u2019Azur et co-auteur de cette publication. \u00ab\u00a0Nous n\u2019avons encore jamais observe\u0301 de plane\u0300te de type \u00ab Neptune chaude \u00bb, proche de son e\u0301toile, a\u0300 une tempe\u0301rature supe\u0301rieure a\u0300 1500\u00b0C. Au-dela\u0300, l\u2019atmosphe\u0300re s\u2019e\u0301vapore. Ainsi, toutes les plane\u0300tes gazeuses de\u0301couvertes tre\u0300s pre\u0300s de leur e\u0301toile sont des \u00ab Jupiter chauds \u00bb, d\u2019au moins dix fois le rayon de la Terre, donc assez massives pour retenir leur atmosphe\u0300re par gravitation, contrairement aux Neptunes chaudes, plus le\u0301ge\u0300res.\u00a0\u00bb<\/p>\n

L\u2019atmosphe\u0300re de LTT 9779 b pose donc question, ainsi que ces myste\u0301rieuses nue\u0301es. \u00ab\u00a0De tels nuages de me\u0301tal ont de\u0301ja\u0300 e\u0301te\u0301 vus sur d\u2019autres exoplane\u0300tes, mais pluto\u0302t a\u0300 la limite jour-nuit ou\u0300 la tempe\u0301rature baisse, ce qui permet la condensation des vapeurs de silicates et de me\u0301tal. En revanche, a\u0300 plus de 2000\u00b0C, ils ne devraient pas exister\u00a0\u00bb, s\u2019e\u0301tonne le chercheur. Pour expliquer leur pre\u0301sence, l\u2019e\u0301quipe a finalement trouve\u0301 l\u2019inspiration… dans une salle de bain ! \u00ab\u00a0Lorsque l’on prend une douche, la condensation se forme soit parce que l\u2019air se refroidit jusqu’a\u0300 ce que la vapeur d’eau se condense, soit parce qu\u2019on laisse couler l’eau chaude jusqu’a\u0300 ce que des nuages se forment, car l’air est tellement sature\u0301 de vapeur qu’il ne peut tout simplement plus en retenir davantage. De me\u0302me, LTT9779 b peut former des nuages me\u0301talliques malgre\u0301 sa chaleur car l’atmosphe\u0300re est sursature\u0301e en vapeurs de silicate et de me\u0301tal.\u00a0\u00bb<\/p>\n

Le te\u0301lescope spatial James Webb entre dans la danse<\/b><\/p>\n

Et c\u2019est sans doute cette armure de me\u0301tal qui explique l\u2019existence me\u0302me de la plane\u0300te. En renvoyant les 4\/5e de l\u2019e\u0301nergie rec\u0327ue par l\u2019e\u0301toile, les nuages l\u2019empe\u0302chent de trop chauffer. Par ailleurs, comme l\u2019atmosphe\u0300re est compose\u0301e de mole\u0301cules \u00ab\u00a0massives\u00a0\u00bb, elle re\u0301siste mieux a\u0300 l\u2019e\u0301vaporation. Mais ce ne sont que des hypothe\u0300ses. Les chercheurs attendent de\u0301sormais des re\u0301sultats en provenance du James Webb pour les confirmer. \u00ab\u00a0Le te\u0301lescope spatial a d\u2019ores et de\u0301ja\u0300 re\u0301alise\u0301 des observations de LTT9779b par l\u2019interme\u0301diaire de son instrument NIRISS. Elles sont en cours de traitement. Elles devraient pre\u0301ciser la mesure de l\u2019albe\u0301do. Et l\u2019analyse du spectre infrarouge nous renseignera sur la composition de l\u2019atmosphe\u0300re en hydroge\u0300ne et he\u0301lium. Nos mode\u0301lisations de l\u2019atmosphe\u0300re, pour l\u2019instant fonde\u0301es uniquement sur la mesure de l\u2019albe\u0301do de la plane\u0300te, indiquent qu\u2019elle devrait e\u0302tre pauvre en gaz le\u0301gers. Nous imaginons d\u2019ailleurs que c\u2019est parce qu\u2019ils ont e\u0301te\u0301 chasse\u0301s de l\u2019atmosphe\u0300re que celle-ci s\u2019est concentre\u0301e en e\u0301le\u0301ments plus lourds. Le JWST nous permettra de confirmer ou d\u2019infirmer cela.\u00a0\u00bb Les \u00ab\u00a0merveilleux nuages\u00a0\u00bb de LTT 9779 b devraient donc connai\u0302tre d\u2019autres de\u0301veloppements tre\u0300s biento\u0302t…<\/p>\n

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

Africa-Press – Djibouti. J’aime les nuages… les nuages qui passent… la\u0300-bas… la\u0300-bas… les merveilleux nuages !\u00a0\u00bb, e\u0301crivait Charles Baudelaire (Petits poe\u0300mes en prose, 1869). Alors, que lui aurait inspire\u0301 l\u2019existence de la plane\u0300te LTT 9779 b ? Cette \u00ab\u00a0Neptune chaude\u00a0\u00bb, observe\u0301e a\u0300 264 anne\u0301es-lumie\u0300re de la Terre, serait recouverte d\u2019e\u0301pais nuages de silicates me\u0302le\u0301s a\u0300 […]<\/p>\n","protected":false},"author":82,"featured_media":15181,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-15182","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"yoast_head":"\nD\u00e9couverte d'une exoplan\u00e8te recouverte de nuages de m\u00e9tal, aussi brillante qu'un miroir - Djibouti<\/title>\n<meta name=\"description\" content=\"J'aime les nuages... les nuages qui passent... la\u0300-bas... la\u0300-bas... les merveilleux nuages !", e\u0301crivait Charles Baudel ...\" \/>\n<meta name=\"robots\" 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