{"id":15387,"date":"2017-04-26T07:54:35","date_gmt":"2017-04-26T10:54:35","guid":{"rendered":"http:\/\/www.astrofisicamas.cl\/?p=15387"},"modified":"2023-08-07T20:30:40","modified_gmt":"2023-08-07T20:30:40","slug":"columna-de-astronomia-hats-17b-un-jupiter-tibio-y-compacto-transitando-en-una-orbita-circular-de-16-3-dias","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/columna-de-astronomia-hats-17b-un-jupiter-tibio-y-compacto-transitando-en-una-orbita-circular-de-16-3-dias\/","title":{"rendered":"Nuestra investigaci\u00f3n: HATS-17b: Un J\u00fapiter tibio y compacto transitando en una \u00f3rbita circular de 16.3 d\u00edas"},"content":{"rendered":"<h4><strong><em>Por Rafael Brahm, investigador postdoctoral MAS y del Instituto de Astrof\u00edsica UC<\/em><\/strong><!--more--><\/h4>\n<p><strong>Una de las principales motivaciones para detectar nuevos planetas extrasolares es comprender c\u00f3mo se forman y de qu\u00e9 materiales est\u00e1n constituidos.<\/strong> Las propiedades b\u00e1sicas que necesitamos para contestar esas preguntas son sus masas y radios. Hoy en d\u00eda, estas propiedades solo pueden ser obtenidas para los planetas que, vistos desde la Tierra, eclipsan a su estrella. Para estos exoplanetas transitantes podemos medir su radio a partir de la fracci\u00f3n de luz de estrella que bloquean, mientras que sus masas se determinan midiendo el efecto gravitacional del planeta sobre su estrella.<\/p>\n<p><strong>De los 3472 planetas descubiertos a la fecha conocemos con precisi\u00f3n sus masas y radios solo para un 10%. <\/strong>Adem\u00e1s, la gran mayor\u00eda de los que han sido medidos orbitan extremadamente cerca de su estrella (mucho m\u00e1s cerca que Mercurio del Sol) con per\u00edodos orbitales menores a cinco d\u00edas. Esto hace que la estructura del planeta est\u00e9 muy afectada por la estrella y dificulta el estudio de la estructura f\u00edsica de los planetas en s\u00ed.<\/p>\n<p>En el MAS trabajamos para descubrir planetas transitantes en colaboraci\u00f3n con el proyecto internacional <a href=\"http:\/\/www.hatsouth.org\"><strong>HATSouth<\/strong><\/a><strong>. Este proyecto consta de 24 peque\u00f1os telescopios rob\u00f3ticos ubicados en tres estaciones en el hemisferio sur: Australia, Namibia y Chile.<\/strong> Esta distribuci\u00f3n permite monitorear la luz de muchas estrellas ininterrumpidamente ya que cuando se hace de d\u00eda en una estaci\u00f3n, ya es de noche en otra. De esta manera se obtienen muchos m\u00e1s datos, y mucho m\u00e1s completos, que observando s\u00f3lo desde un locaci\u00f3n geogr\u00e1fica. La estrategia aumenta significativamente la probabilidad de detectar planetas con per\u00edodos orbitales m\u00e1s largos que cinco d\u00edas.<\/p>\n<p><strong>Es as\u00ed como recientemente descubrimos el planeta <\/strong><a href=\"http:\/\/iopscience.iop.org\/article\/10.3847\/0004-6256\/151\/4\/89\/meta\"><strong>HATS-17b<\/strong><\/a>, que tiene un per\u00edodo de 16.3 d\u00edas, y resulta ser el planeta transitante de mayor per\u00edodo orbital descubierto desde la Tierra. El largo per\u00edodo implica que HATS-17b est\u00e1 lo suficientemente lejos de su estrella como para que su estructura f\u00edsica no est\u00e1 mayormente alterada. Lo que descubrimos es que HATS-17b tiene una masa similar a la de J\u00fapiter, pero un radio 20% menor al del gigante de nuestro Sistema Solar. <strong>La alta densidad de HATS-17b indica que contiene un n\u00facleo s\u00f3lido de aproximadamente 200 veces la masa de la Tierra. Esto marca un significativo contraste con las 10 masas terrestres que contendr\u00eda J\u00fapiter en su n\u00facleo.<\/strong> La elevada concentraci\u00f3n de material s\u00f3lido de HATS-17b parece estar relacionada con la alta concentraci\u00f3n de elementos pesados de su estrella madre. Esto implicar\u00eda que los planetas gigantes tender\u00edan a formarse a partir de una aglomeraci\u00f3n inicial de elementos s\u00f3lidos y no por colapso gravitatorio de gases dentro del disco protoplanetario. El descubrimiento de otros sistemas similares por el proyecto HATSouth ser\u00e1 fundamental para confirmar o rechazar estas ideas.<\/p>\n<p><em>Imagen principal:\u00a0Los 8 telescopios del proyecto HATSouth ubicados en el observatorio Las Campanas (Chile). Cr\u00e9dito: Gaspar Bakos<\/em><\/p>\n<figure id=\"attachment_15388\" aria-describedby=\"caption-attachment-15388\" style=\"width: 731px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/04\/2017_26_04_RBrahm_imagen2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15388 size-full\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/04\/2017_26_04_RBrahm_imagen2.jpg\" alt=\"\" width=\"731\" height=\"490\" \/><\/a><figcaption id=\"caption-attachment-15388\" class=\"wp-caption-text\">Curva de luz combinada que permiti\u00f3 la detecci\u00f3n inicial de HATS-17b.<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>Por Rafael Brahm, investigador postdoctoral MAS y del Instituto de Astrof\u00edsica UC<\/p>","protected":false},"author":3,"featured_media":29268,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","footnotes":""},"categories":[59],"tags":[],"class_list":["post-15387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columnas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nuestra investigaci\u00f3n: HATS-17b: Un J\u00fapiter tibio y compacto transitando en una \u00f3rbita circular de 16.3 d\u00edas - Instituto Milenio de Astrof\u00edsica MAS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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