{"id":4951,"date":"2013-02-12T00:00:00","date_gmt":"2013-02-11T23:00:00","guid":{"rendered":"https:\/\/www.ieec.cat\/gaia-will-reveal-the-secrets-of-ultra-cool-dwarfs-in-our-galaxy-not-translated-2\/"},"modified":"2022-12-22T23:20:54","modified_gmt":"2022-12-22T22:20:54","slug":"gaia-will-reveal-the-secrets-of-ultra-cool-dwarfs-in-our-galaxy-not-translated","status":"publish","type":"post","link":"https:\/\/www.ieec.cat\/es\/gaia-will-reveal-the-secrets-of-ultra-cool-dwarfs-in-our-galaxy-not-translated\/","title":{"rendered":"Gaia will reveal the secrets of ultra-cool dwarfs in our galaxy [NOT TRANSLATED]"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00bb1&#8243; fullwidth=\u00bbon\u00bb theme_builder_area=\u00bbpost_content\u00bb _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb height=\u00bb114px\u00bb background_color=\u00bb\u00bb hover_enabled=\u00bb0&#8243; sticky_enabled=\u00bb0&#8243; title_text=\u00bb\u00bb background_image=\u00bb\/wp-content\/uploads\/2022\/04\/slider-corpo2.jpg\u00bb][\/et_pb_section][et_pb_section fb_built=\u00bb1&#8243; theme_builder_area=\u00bbpost_content\u00bb _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb custom_padding=\u00bb||0px||false|false\u00bb custom_margin=\u00bb||0px||false|false\u00bb hover_enabled=\u00bb0&#8243; sticky_enabled=\u00bb0&#8243;][et_pb_row _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb theme_builder_area=\u00bbpost_content\u00bb][et_pb_column _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb type=\u00bb4_4&#8243; theme_builder_area=\u00bbpost_content\u00bb][et_pb_text _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb theme_builder_area=\u00bbpost_content\u00bb _dynamic_attributes=\u00bbcontent\u00bb hover_enabled=\u00bb0&#8243; sticky_enabled=\u00bb0&#8243; custom_margin=\u00bb0px||0px||false|false\u00bb custom_padding=\u00bb0px||0px||false|false\u00bb]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF90aXRsZSIsInNldHRpbmdzIjp7ImJlZm9yZSI6IjxoMSBjbGFzcz1cImVudHJ5X3RpdGxlXCI+IiwiYWZ0ZXIiOiI8L2gxPiJ9fQ==@[\/et_pb_text][et_pb_text _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb theme_builder_area=\u00bbpost_content\u00bb _dynamic_attributes=\u00bbcontent\u00bb custom_padding=\u00bb0px||0px||false|false\u00bb custom_margin=\u00bb0px||0px||false|false\u00bb hover_enabled=\u00bb0&#8243; sticky_enabled=\u00bb0&#8243;]@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9kYXRlIiwic2V0dGluZ3MiOnsiYmVmb3JlIjoiIiwiYWZ0ZXIiOiIiLCJkYXRlX2Zvcm1hdCI6ImN1c3RvbSIsImN1c3RvbV9kYXRlX2Zvcm1hdCI6IlktbS1kIEg6aTpzIn19@[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00bb1&#8243; _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb custom_margin=\u00bb0px||||false|false\u00bb custom_padding=\u00bb0px||||false|false\u00bb top_divider_color=\u00bbRGBA(255,255,255,0)\u00bb top_divider_height=\u00bb0px\u00bb hover_enabled=\u00bb0&#8243; global_colors_info=\u00bb{}\u00bb sticky_enabled=\u00bb0&#8243;][et_pb_row column_structure=\u00bb4_4&#8243; _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_column type=\u00bb4_4&#8243; _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb][et_pb_image src=\u00bbhttps:\/\/www.ieec.cat\/wp-content\/uploads\/2022\/12\/1543421906_1a02699965f2bf692fdf8f093fd35a2c_gaia_uned.jpg\u00bb alt=\u00bbGaia will reveal the secrets of ultra-cool dwarfs in our galaxy\u00bb _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb title_text=\u00bbPR_Image1.png\u00bb hover_enabled=\u00bb0&#8243; sticky_enabled=\u00bb0&#8243; width=\u00bb600px\u00bb module_alignment=\u00bbcenter\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00bb4.14.8&#8243; _module_preset=\u00bbdefault\u00bb global_colors_info=\u00bb{}\u00bb]Among the hundred billion stars which can be observed in the Milky Way, there is a group of stars, the so-named ultra-cool dwarfs, defined as stars with a temperature below 2500 K, which includes ultra-cool dwarfs and brown dwarfs. It is a really interesting group: they are the most ancient objects in our Galaxy and, therefore, they can provide information about its primitive chemical composition. This is one of the objectives of <a href=\"http:\/\/gaiavideo.ub.edu\/\">Gaia mission<\/a> which will be launched at the end of 2013 by the European Space Agency.<\/p>\n<p>When observing them, they seem quite similar, but there are clear differences between brown dwarfs and ultra-cool dwarfs: brown dwarfs do not reach the temperature they need to produce the nuclear reactions which characterize ultra-cool dwarfs. It could be said that brown dwarfs are failed stars because they lack mass.<\/p>\n<p>A study published in the journal Astronomy &amp; Astrophysics, led by the National University of Distance Education (UNED) and in which researchers from the <a href=\"http:\/\/icc.ub.edu\/\">Institute of Cosmos Sciences<\/a> of the UB (ICCUB-IEEC) participated, has developed a method that will allow Gaia to detect tens of ultra-cool dwarfs in the Milky Way. The method to estimate physical parameters of these objects, such as temperature or gravity, has also been validated. Researchers have used data mining techniques to make estimations taking into account the parameters that Gaia can measure and its design characteristics.<\/p>\n<p>This method highly improves the accuracy of data, so the estimation of ultra-cool dwarfs\u2019 temperature will have a little margin of error. This improvement in accuracy will also increase considerably the number of ultra-cool dwarfs detected. However, only few tens of those which show a temperature lower than 1500K and weak bright in the wavelengths observed by Gaia could be detected.<\/p>\n<p>The National University of Distance Education, the Astrobiology Center (CSIC-INTA), the University of C\u00e1diz, and the German-Spanish Calar Alto Observatory participate in the research too.<\/p>\n<p>Gaia mission<\/p>\n<p>Gaia will conduct a census of a thousand million stars in our Galaxy, monitoring each of its target stars about 70 times over a five-year period. It will precisely chart their positions, distances, movements, and changes in brightness. The launch of the satellite, currently on trial, will take place at the end of 2013, on a Soyuz-Fregat rocket. During this period of time, it is expected to discover hundreds of thousands of new celestial objects. Gaia instruments are so precise that, if it was on the Earth, it would be able to measure the thumb of a person who is on the Moon\u2019s surface. Gaia will provide information about different parameters (position, speed, distance, physical properties, etc.) for each object, so a map of our Galaxy will be obtained.<\/p>\n<p>Gaia mission will generate more than one petabyte of information, in other words, one million giga, which will have to be processed and analysed in order to get results.<\/p>\n<p>About 400 scientists collaborate in the project in which thirty researchers and technicians from the <a href=\"http:\/\/www.am.ub.edu\/web_departament_eng\/indexeng.html\">Department of Astronomy and Meteorology of the UB<\/a> and from the ICCUB had an important role in creating and designing the instrument, as well as in processing and simulating the data obtained during the mission.<\/p>\n<p>Article:<\/p>\n<p>L. M. Sarro, A. Berihuete, C. Carri\u00f3n, D. Barrado, P. Cruz, Y. Isasi. <a href=\"http:\/\/www.aanda.org\/index.php?option=com_article&amp;access=doi&amp;doi=10.1051\/0004-6361\/201219867&amp;Itemid=129\">\u201cProperties of ultra-cool dwarfs with Gaia. An assessment of the accuracy for the temperature determination\u201c<\/a>. Astronomy and Astrophysics, 550, A44, 23rd January 2013. DOI: 10.1051\/0004-6361\/201219867<\/p>\n<p>References:<\/p>\n<p>&#8211; Reference: <a href=\"http:\/\/divulgauned.es\/?attachment_id=2607\">Divulga UNED<\/a> (Article in Spanish)<br \/>&#8211; Universitat de Barcelona \u2013 <a href=\"http:\/\/www.ub.edu\/web\/ub\/en\/menu_eines\/noticies\/2013\/02\/026.html\">Article GAIA<\/a> [NOT TRANSLATED][\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Among the hundred billion stars which can be observed in the Milky Way, there is a group of stars, the so-named ultra-cool dwarfs, defined as stars with a temperature below 2500 K, which includes ultra-cool dwarfs and brown dwarfs. It is a really interesting group: they are the most ancient objects in our Galaxy and, [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":4946,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"2880","footnotes":""},"categories":[70,77],"tags":[],"class_list":["post-4951","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-anuncios","category-otros-anuncios"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gaia will reveal the secrets of ultra-cool dwarfs in our galaxy [NOT TRANSLATED] - IEEC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ieec.cat\/es\/gaia-will-reveal-the-secrets-of-ultra-cool-dwarfs-in-our-galaxy-not-translated\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gaia will reveal the secrets of ultra-cool dwarfs in our galaxy [NOT TRANSLATED] - IEEC\" \/>\n<meta property=\"og:description\" content=\"Among the hundred billion stars which can be observed in the Milky Way, there is a group of stars, the so-named ultra-cool dwarfs, defined as stars with a temperature below 2500 K, which includes ultra-cool dwarfs and brown dwarfs. 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