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Una supernova de colapso de núcleo de baja energía sin una envoltura de hidrógeno
S Valenti1, A Pastorello, E Cappellaro
1Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK. s.valenti@qub.ac.uk
Nature
|June 5, 2009
Resumen
Los astrónomos descubrieron SN 2008ha, una supernova débil y pobre en hidrógeno. Este hallazgo puede vincular supernovas débiles con estallidos de rayos gamma de larga duración, previamente no asociados con supernovas visibles.
Área de la Ciencia:
- * Astrofísica es la astrofísica.
- * Evolución estelar de las estrellas.
- * Física de las Supernovas.
Sus antecedentes:
- * Las estrellas masivas (>25-30 masas solares) pueden convertirse en estrellas Wolf-Rayet deficientes en hidrógeno debido a los fuertes vientos estelares.
- * El colapso del núcleo en estrellas masivas puede producir supernovas de baja energía con luminosidad débil y baja energía cinética.
- * Un origen alternativo para las supernovas de baja energía es el colapso de núcleos de oxígeno-neón en estrellas de 7-9 masas solares.
- * Anteriormente, no se habían observado supernovas débiles, con deficiencia de hidrógeno y colapso del núcleo.
Objetivo del estudio:
- * Para informar sobre el descubrimiento y las características de SN 2008ha, una supernova débil y pobre en hidrógeno.
- * Para investigar la posible clasificación errónea de supernovas débiles similares como eventos termonucleares peculiares (similares a SN 2002cx).
- * Para explorar la conexión entre supernovas débiles, despojadas de hidrógeno y supernovas de colapso de núcleo y estallidos de rayos gamma de larga duración.
Principales métodos:
- * Astronomía observacional: Detección y análisis de SN 2008ha.
- * Análisis espectroscópico para determinar las propiedades de las supernovas (por ejemplo, deficiencia de hidrógeno, luminosidad).
- * Modelado teórico para vincular las características de las supernovas observadas con las vías de evolución estelar.
Principales resultados:
- * SN 2008 ha sido identificada como una supernova débil y pobre en hidrógeno.
- * Propuesta de que eventos similares pueden haber sido clasificados erróneamente como supernovas similares a SN 2002cx.
- * Se estableció una posible asociación entre supernovas débiles, despojadas de hidrógeno y estallidos de rayos gamma de larga duración.
Conclusiones:
- * SN 2008ha representa una nueva clase de supernovas débiles observadas.
- * La clasificación errónea de eventos similares podría explicar la falta de observación anterior.
- * Este descubrimiento proporciona un posible vínculo observacional con las explosiones de rayos gamma de larga duración.
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