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Un resplandor de colisión planetaria y el tránsito de la nube de escombros resultante
Matthew Kenworthy1, Simon Lock2, Grant Kennedy3,4
1Leiden Observatory, Leiden University, Leiden, The Netherlands. kenworthy@strw.leidenuniv.nl.
Nature
|October 11, 2023
Resumen
Las colisiones gigantes a escala planetaria pueden ocurrir alrededor de estrellas jóvenes. Las observaciones revelan una estrella brillante por el impacto de un exoplaneta masivo, seguido de un eclipse por la nube de escombros resultante.
Área de la Ciencia:
- Ciencia exoplanetaria y astrofísica.
- Evolución del disco estelar y protoplanetario.
Sus antecedentes:
- Los planetas se forman en discos de gas y polvo alrededor de estrellas jóvenes.
- Los impactos gigantes entre planetas pueden ocurrir después de que el gas del disco se disipe.
- Las observaciones anteriores de Spitzer detectaron brillo infrarrojo de tales eventos.
Objetivo del estudio:
- Para investigar un evento único de brillo infrarrojo alrededor de la joven estrella ASASSN-21qj.
- Determinar la causa de las variaciones infrarrojas y ópticas observadas.
- Para proporcionar evidencia observacional para las colisiones de exoplanetas gigantes.
Principales métodos:
- Observaciones combinadas infrarrojas y ópticas de la estrella ASASSN-21qj.
- Análisis del brillo infrarrojo, la luminosidad y la temperatura del cuerpo negro.
- Análisis de tiempo del brillo infrarrojo y el posterior eclipse óptico.
Principales resultados:
- Se detectó un brillo infrarrojo significativo (1,000 K, 4% de luminosidad estelar) que duró ~ 1,000 días.
- Un complejo eclipse óptico dependiente de la longitud de onda siguió al brillo después de 2.5 años.
- El evento es consistente con una colisión entre dos exoplanetas (de varios a decenas de masas terrestres).
Conclusiones:
- Los fenómenos observados apoyan un escenario de impacto gigante entre exoplanetas.
- La emisión infrarroja proviene de un remanente caliente y extendido después del impacto.
- El eclipse óptico es causado por el tránsito de escombros de impacto.
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