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Tránsito de candidatos planetarios extrasolares en el bulto galáctico.
Kailash C Sahu1, Stefano Casertano, Howard E Bond
1Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA. ksahu@stsci.edu
Nature
|October 7, 2006
Resumen
Los astrónomos descubrieron 16 nuevos candidatos a exoplanetas, incluidos cinco planetas de período ultracorto que orbitan alrededor de estrellas de baja masa. Estos hallazgos sugieren que los planetas jovianos pueden migrar a radios más pequeños alrededor de estrellas menos masivas.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Ciencia exoplanetaria Ciencia de los exoplanetas.
Sus antecedentes:
- Más de 200 planetas extrasolares detectados a través de desplazamientos y tránsitos Doppler.
- Las encuestas de tránsito generalmente se centran en estrellas más masivas que 0,75 masas solares (M).
- Los planetas de período corto (1.2-2.5 días) se encuentran principalmente a través de encuestas de tránsito.
Objetivo del estudio:
- Para llevar a cabo una búsqueda de tránsito planetario en un campo estelar denso hacia el bulto galáctico.
- Para identificar candidatos a exoplanetas, particularmente aquellos con períodos orbitales cortos.
- Para investigar las características de los planetas que orbitan alrededor de estrellas de baja masa.
Principales métodos:
- Realizó una encuesta de tránsito en un campo estelar rico.
- Analizaron datos de tránsito para identificar posibles candidatos a exoplanetas.
- Utilizó mediciones de velocidad radial para confirmar la naturaleza planetaria en casos seleccionados.
Principales resultados:
- Descubrió 16 candidatos a exoplanetas con períodos orbitales que van desde 0,4 a 4,2 días.
- Se identificaron cinco candidatos que orbitan alrededor de estrellas con masas entre 0,44 y 0,75 M.
- Confirmó dos candidatos como planetas utilizando mediciones de velocidad radial.
- Se encontraron cinco planetas de período ultracorto (período orbital < 1,0 día) alrededor de estrellas menos masivas que 0,88 M.
Conclusiones:
- Introdujo una nueva clase de planetas de período ultra corto que orbitan alrededor de estrellas de baja masa.
- Supuso que los planetas cercanos a las estrellas luminosas pueden ser destruidos por la evaporación.
- Sugirió que los planetas jovianos podrían migrar a radios más pequeños alrededor de estrellas de menor masa.
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