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La atmósfera de un exoplaneta. Estructura térmica de la atmósfera de un exoplaneta a partir de la espectroscopia de
Kevin B Stevenson1, Jean-Michel Désert2, Michael R Line3
1Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA. NASA Sagan Fellow. kbs@uchicago.edu.
Science (New York, N.Y.)
|October 11, 2014
Resumen
Exoplanetas altamente irradiados como WASP-43b muestran diferencias extremas de temperatura entre el día y la noche. Las observaciones del Telescopio Espacial Hubble revelan estructuras térmicas atmosféricas detalladas y variaciones con presión y longitud.
Área de la Ciencia:
- La ciencia exoplanetaria es la ciencia de los exoplanetas.
- Física de la atmósfera física de la atmósfera.
- La astrofísica es la astrofísica.
Sus antecedentes:
- Los exoplanetas que orbitan cerca de las estrellas experimentan una intensa radiación estelar.
- Comprender las atmósferas de los exoplanetas requiere estudiar su respuesta al forzamiento estelar extremo.
Objetivo del estudio:
- Para investigar la estructura térmica atmosférica del exoplaneta altamente irradiado WASP-43b.
- Para mapear la emisión térmica del planeta a través de su fase orbital.
Principales métodos:
- Mediciones espectroscópicas de emisión térmica con el Telescopio Espacial Hubble.
- Observaciones de la curva de fase durante tres rotaciones completas del planeta.
- Construcción de una estructura térmica atmosférica mapa.
Principales resultados:
- Se observaron variaciones significativas de temperatura día-noche en todas las altitudes.
- Disminución monotónica de la temperatura con presión en todas las longitudes.
- El albedo de los bonos derivados es de 0,18 ((-0,12) ((+0,07).
- Dependencia de altitud observada en el desplazamiento del punto caliente desde el punto subestelar.
Conclusiones:
- WASP-43b exhibe contrastes térmicos extremos debido a la alta irradiación.
- La temperatura atmosférica disminuye con la profundidad y varía significativamente entre el día y la noche.
- El albedo y la distribución del calor del planeta están influenciados por su dinámica atmosférica.
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