{"id":16204,"date":"2017-08-16T16:13:19","date_gmt":"2017-08-16T19:13:19","guid":{"rendered":"http:\/\/www.astrofisicamas.cl\/?p=16204"},"modified":"2023-08-07T18:46:20","modified_gmt":"2023-08-07T18:46:20","slug":"nuestra-investigacion-observando-atmosferas-de-mundos-lejanos","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/nuestra-investigacion-observando-atmosferas-de-mundos-lejanos\/","title":{"rendered":"Nuestra investigaci\u00f3n: observando atm\u00f3sferas de mundos lejanos"},"content":{"rendered":"<h4><em><strong>Por N\u00e9stor Espinoza, estudiante de doctorado Instituto Milenio de Astrof\u00edsica, Instituto de Astrof\u00edsica UC<\/strong><\/em><!--more--><\/h4>\n<p><strong>Uno de los resultados m\u00e1s asombrosos del \u00faltimo tiempo ha sido el descubrimiento de miles de planetas orbitando estrellas distintas a nuestro Sol \u2013 \u201cexoplanetas\u201d, como les decimos los astr\u00f3nomos. La diversidad de condiciones en las que estos planetas orbitan sus estrellas es enorme<\/strong>: existen mundos gigantes, como nuestro J\u00fapiter, peque\u00f1os, como nuestra Tierra, mundos a temperaturas que exceden los 2000 grados Celsius, para los que no tenemos an\u00e1logos en el Sistema Solar, mundos que orbitan estrellas peque\u00f1as, gigantes&#8230;\u00a1una locura! <strong>A\u00fan no tenemos mucha idea de c\u00f3mo <em>realmente<\/em> son<\/strong>: \u00bfde qu\u00e9 est\u00e1n compuestos esos mundos?, \u00bftendr\u00e1n agua?, \u00bfnubes? Y si tienen alguno de estos elementos&#8230; \u00bfc\u00f3mo llegaron estos al planeta? <strong>En el MAS, estamos intentando averiguarlo<\/strong>.<\/p>\n<p>En nuestro Sistema Solar, los planetas tienen composiciones muy distintas al Sol, a pesar de que nacieron de la misma nube inicial. Esto nos dice \u201ca gritos\u201d que los planetas y el Sol tienen, por supuesto, distintos <em>mecanismos<\/em> de formaci\u00f3n. Hace unos 4500 millones de a\u00f1os, cuando se estaban formando el Sol y los planetas, mientras el Sol se sentaba quieto en el centro y esperaba que el material llegara a \u00e9l gracias a su enorme gravedad, los planetas ten\u00edan que conformarse con lo que iba quedando alrededor. Lo interesante es que \u201clo que queda a tu alrededor\u201d si eres un planeta en formaci\u00f3n, depende de d\u00f3nde est\u00e9s: si est\u00e1s muy lejos del Sol, por ejemplo, hace mucho fr\u00edo; tanto, que algunos elementos se \u201ccongelan\u201d. As\u00ed, tu \u201cdieta\u201d como planeta en formaci\u00f3n es distinta a la de otros m\u00e1s cercanos al Sol y, por tanto, tu composici\u00f3n va a ser distinta. Siguiendo esta l\u00f3gica, hace poco lideramos un estudio [1] en el que predecimos que el agua, por ejemplo, deber\u00eda ser com\u00fan en muchas atm\u00f3sferas de estos mundos lejanos gigantes, debido a que se ha descubierto que los planetas son muy buenos comiendo este material \u201ccongelado\u201d (que usualmente es rico en ox\u00edgeno, fundamental para formar agua) \u2013 m\u00e1s de lo que cre\u00edamos hace unos a\u00f1os.<\/p>\n<p><strong>Toda buena teor\u00eda debe sustentarse ante la evidencia emp\u00edrica. Es por eso que en el MAS tambi\u00e9n estamos intentando observar atm\u00f3sferas de estos mundos lejanos. Hacerlo no es un trabajo f\u00e1cil, pues es imposible simplemente apuntar nuestros telescopios a estos planetas y observar sus atm\u00f3sferas. Lo que hacemos en la pr\u00e1ctica es esperar a que un exoplaneta pase justo entre una estrella y nosotros en la Tierra<\/strong> (como los <a href=\"http:\/\/www.astrofisicamas.cl\/columna-de-astronomia-hats-17b-un-jupiter-tibio-y-compacto-transitando-en-una-orbita-circular-de-16-3-dias\/\">exoplanetas transitantes, que tambi\u00e9n estamos descubriendo en el MAS<\/a>). Durante el eclipse parcial que se produce en esta situaci\u00f3n, parte de la luz de la estrella lejana pasar\u00e1 tambi\u00e9n <em>a trav\u00e9s<\/em> de la atm\u00f3sfera del exoplaneta, interactuando con ella, y tray\u00e9ndonos esa informaci\u00f3n a la Tierra (v\u00e9ase la Figura 1). Esta peque\u00f1a se\u00f1al provocada por las atm\u00f3sferas de estos mundos lejanos en la luz que recibimos de sus estrellas aqu\u00ed en la Tierra es la que estamos intentando detectar usando telescopios gigantes. <strong>En particular en nuestro proyecto, el <em>Arizona-CfA-Cat\u00f3lica Exoplanet Spectroscopy Survey<\/em> (ACCESS), estamos usando el telescopio Baade de 6.5m ubicado en el Observatorio Las Campanas, aqu\u00ed en Chile; \u00a1y los resultados son espectaculares!<\/strong><\/p>\n<figure id=\"attachment_16205\" aria-describedby=\"caption-attachment-16205\" style=\"width: 624px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/08\/2017_08_16_nespinoza2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-16205 size-full\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/08\/2017_08_16_nespinoza2.jpg\" alt=\"\" width=\"624\" height=\"188\" \/><\/a><figcaption id=\"caption-attachment-16205\" class=\"wp-caption-text\">Figura 1. Representaci\u00f3n gr\u00e1fica del paso de la luz estelar a trav\u00e9s de la atm\u00f3sfera de un exoplaneta.<\/figcaption><\/figure>\n<p>A la fecha, con este proyecto, hemos descubierto neblina en el exoplaneta gigante WASP-6b [2], por ejemplo, y se\u00f1ales muy interesantes en la super-Tierra (o sub-Neptuno) GJ1214b [3], las que los modelos de atm\u00f3sferas para este exoplaneta no pod\u00edan reproducir. Finalmente, descubrimos que estas se\u00f1ales no eran de la atm\u00f3sfera del planeta: \u00a1eran de la estrella alrededor de la que \u00e9ste orbita! Este \u00faltimo resultado es muy interesante pues nos recuerda lo importante que es entender muy bien la estrella que orbita el exoplaneta que estamos estudiando: solo puedes entender bien las se\u00f1ales que recibes de tu exoplaneta si entiendes, muy, muy bien, la estrella del mismo. <strong>Actualmente, estamos estudiando las atm\u00f3sferas de decenas de otros planetas, varios de los cuales ya est\u00e1n casi listos para ser publicados: \u00a1est\u00e9n atent@s!<\/strong><\/p>\n<p><strong>Refs:<\/strong><\/p>\n<p>[1] http:\/\/adsabs.harvard.edu\/cgi-bin\/bib_query?arXiv:1611.08616<\/p>\n<p>[2] http:\/\/adsabs.harvard.edu\/abs\/2013ApJ&#8230;778..184J<\/p>\n<p>[3] http:\/\/adsabs.harvard.edu\/cgi-bin\/bib_query?arXiv:1612.00228<\/p>","protected":false},"excerpt":{"rendered":"<p>Por N\u00e9stor Espinoza, estudiante de doctorado Instituto Milenio de Astrof\u00edsica, Instituto de Astrof\u00edsica UC<\/p>","protected":false},"author":3,"featured_media":29243,"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-16204","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 - 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