{"id":5147,"date":"2017-08-02T12:04:21","date_gmt":"2017-08-02T12:04:21","guid":{"rendered":"~\/category_mark\/novedades_publicadas\/147"},"modified":"2017-12-20T10:17:57","modified_gmt":"2017-12-20T10:17:57","slug":"novedades_publicadas","status":"publish","type":"post","link":"https:\/\/www.fcaglp.unlp.edu.ar\/index.php\/novedades_publicadas\/","title":{"rendered":"Formaci\u00f3n de planetas gigantes en \u00f3rbitas amplias"},"content":{"rendered":"<p style=\"text-align: justify;\"><strong>&iquest;Puede resumir de qu&eacute; se trata la publicaci&oacute;n? <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>&nbsp;<\/strong><br \/>En este trabajo presentamos una idea novedosa para la formaci&oacute;n de planetas gigantes en &oacute;rbitas lejanas, de los cuales se han detectado varios ejemplos durante la &uacute;ltima d&eacute;cada y cuya formaci&oacute;n es todav&iacute;a un misterio.<br \/>El trabajo ofrece una forma natural de explicar la formaci&oacute;n de planetas gigantes en &oacute;rbitas lejanas dentro del paradigma dominante de la formaci&oacute;n de planetas gigantes por acreci&oacute;n del n&uacute;cleo. El escenario funciona de la siguiente manera: cuando la fotoevaporaci&oacute;n del disco de gas, causada por la radiaci&oacute;n de la estrella central, abre un agujero central en el disco, esto genera una regi&oacute;n del disco donde los torques sobre el planeta actuan en la direcci&oacute;n opuesta a la usual. Como consecuencia, los planetas ubicados cerca del frente de fotoevaporaci&oacute;n del disco sufren una migraci&oacute;n hacia el exterior del disco, alej&aacute;ndose de la estrella central. Si se dan las condiciones apropiadas, y en el trabajo mostramos que estas condiciones pueden darse en una variedad de sistemas, el planeta en formaci&oacute;n migrar&aacute; hacia el exterior del disco manteni&eacute;ndose siempre cerca del frente de fotoevaporaci&oacute;n y migrando cada vez m&aacute;s hacia afuera. De esta manera es posible formar planetas gigantes en regiones muy externas del disco donde inicialmente no hay material suficiente para formar un n&uacute;cleo planetario masivo (que es el prerequicito para la formaci&oacute;n de planetas gigantes en la teor&iacute;a estandar).<br \/>Para ello realizamos una mejora del c&oacute;digo de formaci&oacute;n planetaria del Grupo (PlanetaLP) mediante la incorporaci&oacute;n de un modelado m&aacute;s realista del disco de gas y un mejor tratamiento de la interacci&oacute;n planeta disco y las consecuentes tasas de migraci&oacute;n.<\/p>\n<p style=\"text-align: justify;\"><strong>&iquest;Cual es la importancia de este trabajo? <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>&nbsp;<\/strong>Desde las primeras detecciones por imagen directa de planetas (Marois et al. 2008, Kalas et al. 2008) se ha detectado un n&uacute;mero creciente de planetas gigantes que orbitan alrededor de la estrella central a distancias mayores a las 50 UA. La formaci&oacute;n de planetas gigantes a distancias tan grandes es un problema para la teor&iacute;a de formaci&oacute;n de los mismos por acreci&oacute;n del n&uacute;cleo, que es el paradigma dominante para la formaci&oacute;n planetaria. Esto ha llevado a reflotar la idea alternativa de que algunos planetas gigantes se forman mediante la fragmentaci&oacute;n directa del disco protoplanetario y el colapso gravitatorio de estos fragmentos. En este contexto, algunos investigadores han propuesto modificaciones a la teor&iacute;a de formaci&oacute;n por acreci&oacute;n del n&uacute;cleo para &#8220;salvarla&#8221; y permitirle formar planetas en &oacute;rbitas lejanas.<br \/>La importancia de este trabajo es que ofrece un mecanismo natural, i.e. sin modificaciones ad-hoc, dentro de la teor&iacute;a estandar para formar planetas gigantes en &oacute;rbitas lejanas.<\/p>\n<p style=\"text-align: justify;\"><strong>&iquest;Cual es su aporte?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong><\/strong>El total del trabajo ha sido desarrollado por investigadores de nuestra facultad. Los aportes de los diferentes integrantes pueden resumirse de la siguiente manera: Paula y Octavio identificaron en un trabajo anterior la existencia de planetas que se formaban en sus simulaciones y migraban al exterior del sistema planetario como consecuencia de su interacci&oacute;n con el disco de gas. Sobre esta base proyectaron la idea central del escenario. A fin de que las simulaciones fuesen m&aacute;s realistas, y por lo tanto m&aacute;s convincentes, necesit&aacute;bamos mejorar el c&aacute;lculo de la migraci&oacute;n planetaria. Esto involucraba mejorar el c&aacute;lculo de la estructura termodin&aacute;mica del disco de gas. La mejora del modelado num&eacute;rico del disco de gas y la implementaci&oacute;n de un c&aacute;lculo m&aacute;s realista de los torques del disco sobre el planeta fue realizada por Octavio y Marcelo. Una vez obtenidos los resultados con el modelo mejorado todos participamos en la discusi&oacute;n de los resultados, su presentaci&oacute;n y la escritura del art&iacute;culo.<\/p>\n<p style=\"text-align: justify;\"><strong>&iquest;Tienen pensado continuar investigando el caso o casos similares? &iquest;Cual es la perspectiva a futuro?<\/strong><\/p>\n<p style=\"text-align: justify;\">S&iacute;, la idea ser&iacute;a realizar una exploraci&oacute;n sistem&aacute;tica del problema y su espacio de par&aacute;metros mediante una s&iacute;ntesis de poblaci&oacute;n. Esto nos permitir&aacute; entender bajo qu&eacute; circunstancias f&iacute;sicas (masas de los discos, masas de la estrella central, tama&ntilde;o de los planetesimales) el mecanismo es efectivo. M&aacute;s importante a&uacute;n, una exploraci&oacute;n del espacio de par&aacute;metros podr&iacute;a darnos una idea de cual es la frecuencia esperada para este tipo de sistemas. Esto es importante porque los planetas gigantes en &oacute;rbitas aisladas son una peque&ntilde;a minor&iacute;a y cualquier mecanismo para formarlos no deber&iacute;a ser muy efectivo. Adem&aacute;s, la idea es explorar la formaci&oacute;n de planetas gigantes en &oacute;rbitas lejanas inmersos en sistemas planetarios completos. Es decir, extender este trabajo al estudio de la formaci&oacute;n de varios planetas a la vez, dado que hasta el momento solo hemos explorado la formaci&oacute;n aislada de los mismos.<\/p>\n<p style=\"text-align: justify;\">&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p> &#8220;The formation of giant planets in wide orbits by photoevaporation-synchronised migration&#8221; .  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