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Una joven enana blanca compañera del púlsar B1620-26: evidencia de la formación temprana de planetas
Steinn Sigurdsson1, Harvey B Richer, Brad M Hansen
1525 Davey Laboratory, Department of Astronomy, Pennsylvania State University, University Park, PA 16802, USA. steinn@astro.psu.edu
Science (New York, N.Y.)
|July 12, 2003
Resumen
Los astrónomos descubrieron una enana blanca poco masiva compañera del púlsar B1620-26 utilizando datos del Telescopio Espacial Hubble. Este hallazgo apoya la formación temprana de planetas en cúmulos globulares de baja metalicidad.
Área de la Ciencia:
- * Astronomía y Astrofísica.
- * Ciencia de los exoplanetas.
- * Evolución estelar de las estrellas.
Sus antecedentes:
- * Se sabe que el sistema de púlsares B1620-26 alberga compañeras.
- * Estudios anteriores han sugerido la presencia de objetos de masa estelar y planetaria.
Objetivo del estudio:
- * Para detectar y caracterizar el compañero estelar del púlsar B1620-26.6.
- * Para restringir la historia de formación y la dinámica del sistema triple.
- * Para inferir la prevalencia y el momento de la formación de planetas en cúmulos globulares.
Principales métodos:
- * Utilizó las observaciones del Telescopio Espacial Hubble (HST).
- * Analizó el color y la magnitud de la compañera estelar.
- * Aplicó modelos de evolución estelar para determinar la masa y la edad.
Principales resultados:
- * Detectado un compañero de enana blanca poco masivo.
- * Se determinó que su masa es de 0,34 +/- 0,04 masas solares.
- * Estimó su edad en 480 x 10^6 +/- 140 x 10^6 años.
Conclusiones:
- * La configuración del sistema probablemente fue el resultado de una interacción de intercambio dinámico en un núcleo de clúster.
- * Los planetas pueden ser comunes en cúmulos globulares de baja metalicidad.
- * La formación de planetas podría ser más extendida y ocurrir antes de lo que se pensaba.
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