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El material circumestelar en las supernovas de tipo Ia a través de las características de absorción de sodio
A Sternberg1, A Gal-Yam, J D Simon
1Benoziyo Center for Astrophysics, Faculty of Physics, Weizmann Institute of Science, Rehovot 76100, Israel. assaf.sternberg@weizmann.ac.il
Science (New York, N.Y.)
|August 13, 2011
Resumen
Las supernovas de tipo Ia, cruciales para la medición de la distancia cósmica, probablemente se originan en sistemas de una sola degeneración. La evidencia sugiere flujos de salida de gas de estos sistemas progenitor, apoyando este modelo para muchas supernovas cercanas.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Cosmología Cosmología.
- Evolución Estelar Evolución Estelar
Sus antecedentes:
- Las supernovas de tipo Ia son indicadores vitales de la distancia cósmica.
- Su origen es objeto de debate, principalmente entre modelos de degeneración simple (enana blanca en acreción con una compañera estelar) y doble degeneración (dos enanas blancas).
- La identidad del donante de masa en los sistemas progenitor sigue siendo incierta.
Objetivo del estudio:
- Investigar la naturaleza de los donantes de masa en los sistemas progenitoras de supernovas de tipo Ia.
- Para determinar si la evidencia observacional apoya escenarios de degeneración simple o doble.
- Para analizar las características del material absorbente a lo largo de la línea de visión de las supernovas de tipo Ia.
Principales métodos:
- Analizó la estructura de velocidad del material absorbente de 35 supernovas de tipo Ia.
- Interpretó las estructuras de velocidad con desplazamiento azul como indicadores de las salidas de gas.
- Características observadas correlacionadas con predicciones teóricas de diferentes modelos de progenitor.
Principales resultados:
- La estructura de velocidad del material absorbente fue predominantemente desplazada hacia el azul a través de la muestra.
- Las salidas de gas con desplazamiento azul son consistentes con el material expulsado de los sistemas progenitoras de supernovas.
- Las salidas observadas favorecen escenarios que implican la eyección de gas de sistemas de un solo degenerado.
Conclusiones:
- Las características de absorción de desplazamiento azulado observadas sugieren salidas de gases de los sistemas progenitor.
- Estas salidas son probablemente firmas de sistemas de degeneración única, donde una enana blanca se acumula de una compañera enana no blanca.
- Muchas supernovas de Tipo Ia en galaxias espirales cercanas pueden originarse de progenitores de una sola degeneración.
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