{"id":12166,"date":"2024-02-29T21:57:36","date_gmt":"2024-02-29T21:57:36","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/autour-dune-etoile-un-telescope-observe-pour-la-premiere-fois-un-ocean-de-vapeur-deau"},"modified":"2024-02-29T23:22:44","modified_gmt":"2024-02-29T23:22:44","slug":"autour-dune-etoile-un-telescope-observe-pour-la-premiere-fois-un-ocean-de-vapeur-deau","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/autour-dune-etoile-un-telescope-observe-pour-la-premiere-fois-un-ocean-de-vapeur-deau","title":{"rendered":"Autour d\u2019une \u00e9toile, un t\u00e9lescope observe pour la premi\u00e8re fois un oc\u00e9an de vapeur d\u2019eau"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Le te\u0301lescope radio-astronomique ALMA a fourni les premie\u0300res images de\u0301taille\u0301es de mole\u0301cules d\u2019eau dans le disque ou\u0300 peuvent nai\u0302tre des plane\u0300tes de la tre\u0300s jeune e\u0301toile HL Tauri, selon une e\u0301tude jeudi.<\/p>\n

\u201cJe n\u2019avais jamais imagine\u0301 que nous pourrions obtenir une image d\u2019oce\u0301an de vapeur d\u2019eau dans la re\u0301gion me\u0302me ou\u0300 une plane\u0300te est susceptible de se former\u201d, a commente\u0301 Stefano Facchini, astronome a\u0300 l\u2019Universite\u0301 de Milan, et premier auteur de l\u2019e\u0301tude parue dans Nature Astronomy.<\/p>\n

Situe\u0301e dans la constellation du Taureau et tre\u0300s proche de la Terre a\u0300 \u201cseulement\u201d 450 anne\u0301es lumie\u0300re, HL Tauri, deux fois plus massive que le Soleil, est depuis longtemps dans le collimateur des te\u0301lescopes terrestres et spatiaux.<\/p>\n

Car sa proximite\u0301 et sa jeunesse, -un million d\u2019anne\u0301es au plus-, offrent une vue imprenable sur son disque protoplane\u0301taire, l\u2019amas de gaz et de poussie\u0300re ceinturant une e\u0301toile qui permet aux plane\u0300tes de se former.<\/p>\n

Selon les mode\u0300les the\u0301oriques, ce processus de formation serait particulie\u0300rement fe\u0301cond a\u0300 un endroit bien pre\u0301cis du disque: la ligne des glaces. La\u0300 ou\u0300 l\u2019eau, qui est sous forme de vapeur a\u0300 proximite\u0301 de l\u2019e\u0301toile, passe a\u0300 l\u2019e\u0301tat solide en se refroidissant. Les grains de poussie\u0300re coaguleraient les uns avec les autres d\u2019autant plus facilement gra\u0302ce a\u0300 la glace les recouvrant.<\/p>\n

De\u0300s 2014, ALMA avait re\u0301alise\u0301 des images sans e\u0301gal du disque protoplane\u0301taire, montrant une alternance d\u2019anneaux lumineux et de sillons sombres. Ces derniers trahiraient la pre\u0301sence d\u2019embryons de plane\u0300tes en formation par accumulation de poussie\u0300res.<\/p>\n

\u2013 Ligne des glaces \u2013<\/b><\/p>\n

D\u2019autres instruments avaient de\u0301tecte\u0301 de l\u2019eau autour de HL Tauri, rappelle l\u2019e\u0301tude, mais avec une re\u0301solution trop faible pour de\u0301limiter pre\u0301cise\u0301ment la ligne des glaces. Depuis son emplacement en altitude, a\u0300 plus de 5.000 me\u0300tres, dans le de\u0301sert chilien de l\u2019Atacama, le radiote\u0301lescope de l\u2019Observatoire europe\u0301en austral (ESO) est le premier a\u0300 cerner cette frontie\u0300re.<\/p>\n

<\/p>\n

\u201cA\u0300 ce jour, ALMA est la seule installation capable de re\u0301soudre spatialement la pre\u0301sence d\u2019eau dans un disque froid de formation de plane\u0300tes\u201d, a revendique\u0301 le professeur Wouter Vlemmings, de l\u2019universite\u0301 sue\u0301doise Chalmers, co-auteur de l\u2019e\u0301tude et cite\u0301 avec le professeur Facchini dans un communique\u0301 de l\u2019ESO.<\/p>\n

Le radiote\u0301lescope a de\u0301tecte\u0301 l\u2019e\u0301quivalent d\u2019au moins trois fois la quantite\u0301 d\u2019eau contenue dans tous les oce\u0301ans terrestres. Le tout dans une zone assez proche de l\u2019e\u0301toile, avec un rayon e\u0301quivalent a\u0300 17 fois la distance se\u0301parant la Terre du Soleil.<\/p>\n

Peut-e\u0302tre plus significatif encore: les images d\u2019ALMA \u201cre\u0301ve\u0300lent une quantite\u0301 importante de vapeur d\u2019eau a\u0300 diffe\u0301rentes distances de l\u2019e\u0301toile, y compris un espace ou\u0300 une plane\u0300te pourrait potentiellement se former a\u0300 l\u2019heure actuelle\u201d, selon le Pr Facchini.<\/p>\n

La matie\u0300re premie\u0300re pour la formation d\u2019une telle plane\u0300te ne semble pas manquer, les calculs d\u2019un autre observatoire estimant la masse de poussie\u0300re disponible a\u0300 l\u2019e\u0301quivalent de treize fois la masse de la Terre.<\/p>\n

L\u2019e\u0301tude montrerait ainsi \u201ccomment la pre\u0301sence d\u2019eau peut influencer le de\u0301veloppement d\u2019un syste\u0300me plane\u0301taire, comme ce fut le cas il y a 4,5 milliards d\u2019anne\u0301es dans notre propre syste\u0300me solaire\u201d, selon Stefano Facchini.<\/p>\n

Pour autant, la compre\u0301hension du me\u0301canisme de formation des plane\u0300tes du syste\u0300me solaire reste incomple\u0300te.<\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. Le te\u0301lescope radio-astronomique ALMA a fourni les premie\u0300res images de\u0301taille\u0301es de mole\u0301cules d\u2019eau dans le disque ou\u0300 peuvent nai\u0302tre des plane\u0300tes de la tre\u0300s jeune e\u0301toile HL Tauri, selon une e\u0301tude jeudi. \u201cJe n\u2019avais jamais imagine\u0301 que nous pourrions obtenir une image d\u2019oce\u0301an de vapeur d\u2019eau dans la re\u0301gion […]<\/p>\n","protected":false},"author":82,"featured_media":12165,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-12166","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"yoast_head":"\nAutour d\u2019une \u00e9toile, un t\u00e9lescope observe pour la premi\u00e8re fois un oc\u00e9an de vapeur d\u2019eau - 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