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Protoplanetas en acreción en el disco de transición LkCa 15
S Sallum1, K B Follette1,2, J A Eisner1
1Astronomy Department, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA.
Nature
|November 20, 2015
Resumen
Los astrónomos detectaron directamente el acrecentamiento de gas en un protoplaneta, LkCa 15 b, dentro de un disco de transición. Esto proporciona evidencia directa de la formación de planetas en curso, un paso crucial para comprender la demografía de los exoplanetas.
Área de la Ciencia:
- Astronomía y astrofísica
- Investigación de exoplanetas
- Estudios de la formación de planetas
Sus antecedentes:
- Los descubrimientos de exoplanetas ofrecen información sobre la arquitectura del sistema solar y la demografía del planeta.
- Los discos de transición, con claros interiores, son sitios clave para estudiar la formación de planetas.
- La observación directa de las firmas de acreción de protoplanetas ha sido un desafío.
Objetivo del estudio:
- Para observar directamente las firmas de acreción en protoplanetas dentro de un disco de transición.
- Para investigar el proceso de formación de planetas en el sistema LkCa 15.
- Para sondear el espacio interior del disco de transición LkCa 15.
Principales métodos:
- Utilizó las observaciones de óptica adaptativa del sistema LkCa 15.
- Seguimiento de las posiciones de la fuente durante varias épocas (2009-2015) para inferir la dinámica orbital.
- Se ha detectado una emisión de Hα para identificar el gas de acreción.
Principales resultados:
- Inferimos la presencia de múltiples compañeros en órbitas Keplerianas dentro del espacio libre del disco.
- Se detectó directamente la emisión de Hα del compañero más interno, LkCa 15 b.
- Gas caliente confirmado (aprox. 10,000 K) que se acumulan en el LkCa 15 b.
Conclusiones:
- LkCa 15 b es un protoplaneta en acreción activa, que proporciona evidencia directa de la formación de planetas en curso.
- Los hallazgos apoyan el papel de los planetas en la formación de discos de transición.
- Este estudio abre nuevas vías para observar y comprender la acreción de protoplanetas.
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