{"id":1816,"date":"2025-02-13T08:28:47","date_gmt":"2025-02-13T07:28:47","guid":{"rendered":"https:\/\/gretsi.fr\/colloque2025\/?p=1816"},"modified":"2025-02-13T08:32:45","modified_gmt":"2025-02-13T07:32:45","slug":"conference-prestige","status":"publish","type":"post","link":"https:\/\/gretsi.fr\/colloque2025\/conference-prestige\/","title":{"rendered":"Conf\u00e9rence Prestige"},"content":{"rendered":"\n
\n
GRETSI’25<\/span>

Conf\u00e9rence Prestige<\/h1><\/div>
<\/div>

Le Colloque GRETSI\u201925 est honor\u00e9 par l\u2019intervention en session Prestige de Anne-Marie Lagrange, Astrophysicienne, membre de l\u2019Acad\u00e9mie des Sciences.<\/p><\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n

\n

<\/i><\/h1>\n\n\n\n

A la recherche de nouveaux mondes<\/h1>\n\n\n\n

par<\/p>\n\n\n\n

Anne-Marie Lagrange<\/h1>\n\n\n\n

Directrice de Recherche, CNRS, Astrophysicienne au LESIA
et Professeur attach\u00e9 \u00e0 l\u2019Universit\u00e9 Paris Sciences et Lettres<\/h3>\n\n\n\n

<\/i> https:\/\/laref.org\/intervenants\/anne-marie-lagrange<\/a><\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Biographie<\/h3>\n\n\n\n

Anne-Marie Lagrange est membre de l\u2019Acad\u00e9mie des Sciences. Ses travaux, bas\u00e9s sur l\u2019observation, l\u2019instrumentation et la mod\u00e9lisation, portent sur la recherche et l\u2019\u00e9tude de syst\u00e8mes plan\u00e9taires extrasolaires.<\/p>\n\n\n\n

Dans les ann\u00e9es 90, elle \u00e9tudie les disques de gaz et de poussi\u00e8res qui constituent le berceau de la formation des plan\u00e8tes, notamment celui de l\u2019\u00e9toile beta Pictoris, \u00e9toile qu\u2019elle gardera comme \u00ab proxy \u00bb au long de sa recherche. Sur cette \u00e9toile, elle co-d\u00e9couvre les premi\u00e8res exo-com\u00e8tes, puis pr\u00e9dit l\u2019existence d\u2019une plan\u00e8te qu\u2019elle imagera une d\u00e9cennie plus tard, gr\u00e2ce \u00e0 une technique de coronographie coupl\u00e9e \u00e0 l\u2019optique adaptative sur le Very Large Telescope europ\u00e9en au Chili.  Cette exoplan\u00e8te, d\u00e9couverte en 2008, orbite \u00e0 la m\u00eame distance que Saturne autour du Soleil. Elle reste la plan\u00e8te imag\u00e9e la plus proche de son \u00e9toile jusqu\u2019\u00e0 la d\u00e9couverte r\u00e9cente de AF Lep b, orbitant \u00e0 une distance \u00e9quivalente.<\/p>\n\n\n\n

Anne-Marie Lagrange propose au d\u00e9but des ann\u00e9es 2000 un instrument enti\u00e8rement d\u00e9di\u00e9 \u00e0 la d\u00e9tection directe et la caract\u00e9risation d\u2019exoplan\u00e8tes g\u00e9antes, qui a permis depuis 2015 la d\u00e9couverte de plusieurs nouvelles exoplan\u00e8tes, et dont l\u2019exploitation n\u2019est pas permin\u00e9e. Les techniques d\u2019analyse de donn\u00e9es sans cesse am\u00e9lior\u00e9es permettent quant \u00e0 elles d\u2019envisager la d\u00e9couverte de plan\u00e8tes encore moins brillantes dans les donn\u00e9es d\u2019archives. Ceci constitue un des objectifs de l\u2019ERC COBREX dont Anne-Marie Lagrange est responsable. Elle \u00e9tudie aussi les limitations physiques qui g\u00eanent aujourd\u2019hui la d\u00e9tection des v\u00e9ritables jumelles de la Terre, sur lesquelles on aimerait trouver un jour des signatures de vie.<\/p>\n<\/div><\/div>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Le Colloque GRETSI\u201925 est honor\u00e9 par l\u2019intervention en session Prestige de Anne-Marie Lagrange, Astrophysicienne, membre de l\u2019Acad\u00e9mie des Sciences.<\/p>\n","protected":false},"author":1,"featured_media":1823,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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