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Una enana blanca ultramassiva y de rápido giro en un peculiar sistema binario
S Mereghetti1, A Tiengo, P Esposito
1Istituto Nazionale di Astrofisica-Istituto di Astrofisica Spaziale e Fisica cosmica di Milano, via E. Bassini 15, 20133 Milano, Italy. sandro@iasf-milano.inaf.it
Science (New York, N.Y.)
|September 5, 2009
Resumen
Los investigadores descubrieron una estrella enana blanca ultramassiva que excede las 1,2 masas solares. Esta estrella masiva, RX J0648.0-4418, podría explotar como una supernova de tipo Ia debido a la transferencia de masa en su sistema binario.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Evolución Estelar Evolución Estelar
Sus antecedentes:
- Las enanas blancas suelen tener masas alrededor de 0,6 masas solares.
- Las enanas blancas ultra masivas (más de 1,2 masas solares) son muy raras.
- Las enanas blancas en sistemas binarios son cruciales para comprender la evolución estelar y las supernovas.
Objetivo del estudio:
- Para identificar y caracterizar las enanas blancas ultramasivas.
- Para investigar el potencial de RX J0648.0-4418 para alcanzar el límite de Chandrasekhar.
- Para explorar las implicaciones para los progenitores de supernovas Tipo Ia.
Principales métodos:
- Se utilizaron datos del satélite de rayos X Misión Múltiples Espejos (XMM) Newton.
- Se realizaron mediciones dinámicas para determinar la masa de la enana blanca.
- Se analizó la configuración del sistema binario (binario de sobre post-común con un subenano caliente).
Principales resultados:
- Se ha confirmado que RX J0648.0-4418 es una enana blanca ultramassiva con una masa superior a 1,2 masas solares.
- La enana blanca es parte de un sistema binario con una compañera enana caliente.
- El sistema está preparado para una transferencia de masa que podría desencadenar una supernova.
Conclusiones:
- RX J0648.0-4418 es un ejemplo clave de una enana blanca ultramassiva.
- Esta enana blanca tiene el potencial de exceder el límite de Chandrasekhar y explotar como una supernova de tipo Ia.
- El estudio destaca la importancia de los sistemas binarios en la comprensión de objetos estelares extremos y eventos explosivos.
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