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Detección desde tierra de una atmósfera de helio extendida en el exoplaneta de masa saturna WASP-69b
Lisa Nortmann1,2, Enric Pallé3,2, Michael Salz4
1Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38205 La Laguna, Tenerife, Spain. nortmann.astro@gmail.com.
Science (New York, N.Y.)
|December 8, 2018
Resumen
Los exoplanetas gigantes de gas caliente pierden atmósfera a través de la irradiación estelar. Las observaciones de helio basadas en tierra revelan el escape atmosférico del exoplaneta WASP-69b, que muestra colas similares a los cometas.
Área de la Ciencia:
- Ciencias exoplanetarias
- Física de la atmósfera
- Espectroscopia
Sus antecedentes:
- Los exoplanetas gigantes de gas caliente experimentan una evolución atmosférica influenciada por la irradiación estelar.
- Los estudios anteriores de escape atmosférico de exoplanetas utilizaron principalmente observaciones ultravioletas basadas en el espacio, limitadas por la absorción interestelar.
Objetivo del estudio:
- Para investigar el escape atmosférico de exoplanetas utilizando espectroscopia de alta resolución en tierra.
- Para detectar y caracterizar la pérdida atmosférica del exoplaneta de masa saturna WASP-69b.
Principales métodos:
- Empleó espectroscopia de alta resolución en tierra para observar el triplete de helio a 1083 nanómetros durante el tránsito del exoplaneta.
- Los datos espectrales analizados para el exceso de absorción y la línea de desplazamiento azul.
Principales resultados:
- Se detectó un exceso significativo de absorción en el triplete de helio (relación señal-ruido de 18) durante el tránsito de WASP-69b.
- Las líneas medidas se desplazan a varios kilómetros por segundo.
- Absorción observada después del tránsito, indicativa de la salida atmosférica.
Conclusiones:
- Interpretó los fenómenos observados como escape atmosférico de WASP-69b.
- La atmósfera que se escapa forma una cola parecida a un cometa que sigue al planeta.
- Este estudio demuestra la eficacia de la espectroscopia de helio en tierra para los estudios de escape atmosférico de exoplanetas.
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