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Un origen estelar masivo para una inusual supernova rica en helio en una galaxia elíptica
K S Kawabata1, K Maeda, K Nomoto
1Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan. kawabtkj@hiroshima-u.ac.jp
Nature
|May 21, 2010
Resumen
La supernova SN 2005cz, similar a SN 2005E, sugiere un origen del colapso del núcleo de una estrella de baja masa. Esto desafía las teorías de detonación de enanas blancas para supernovas inusuales.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Cosmología Cosmología.
Sus antecedentes:
- Inusual supernova rica en helio (tipo Ib) SN 2005E exhibe una débil curva de luz, líneas prominentes de calcio, y carece de formación de estrellas.
- Las teorías anteriores proponían una detonación de helio en una enana blanca en acrecentamiento para explicar las propiedades de SN 2005E.
Objetivo del estudio:
- Para investigar la naturaleza de la supernova SN 2005cz, que comparte características con SN 2005E.
- Para determinar el progenitor y el mecanismo de explosión de SN 2005cz y supernovas inusuales similares.
Principales métodos:
- Análisis comparativo de los datos de observación para SN 2005cz y SN 2005E.
- Modelado de la evolución estelar y escenarios de explosión de supernovas.
- Examen de las propiedades de la galaxia anfitriona, incluida la actividad de formación estelar.
Principales resultados:
- SN 2005cz en una galaxia elíptica muestra propiedades que reflejan SN 2005E.
- Las características observadas se explican mejor por una supernova de colapso de núcleo de una estrella progenitora de baja masa (8-12 masas solares).
- Este progenitor probablemente perdió su envoltura de hidrógeno a través de la interacción binaria, lo que resultó en capas superficiales delgadas y una eyección mínima de níquel-56 radiactivo y oxígeno.
Conclusiones:
- El modelo de colapso del núcleo proporciona una explicación más consistente para SN 2005E y SN 2005cz que la detonación de la enana blanca.
- La evidencia de la reciente formación de estrellas en la galaxia anfitriona elíptica NGC 4589 apoya el escenario de colapso del núcleo de SN 2005cz.
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