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Supernovas superluminosas que se desvanecen lentamente y que no son explosiones de inestabilidad de pares

M Nicholl¹, S J Smartt, A Jerkstrand

¹Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK. mnicholl03@qub.ac.uk

|October 18, 2013

Resumen

Dos nuevas supernovas superluminosas desafían el modelo de inestabilidad de pareja. Las observaciones sugieren que las explosiones impulsadas por magnetares pueden explicar estos y otros eventos cósmicos similares, lo que sugiere que las supernovas de inestabilidad de pares son raras.

Área de la Ciencia:

La astronomía y la astrofísica.
Las explosiones cósmicas son explosiones cósmicas.
Evolución Estelar Evolución Estelar

Sus antecedentes:

Las supernovas superluminosas (SLSNe) son poderosas explosiones estelares observadas en galaxias distantes.
Algunos SLSNe se asemejan a las supernovas teóricas de "inestabilidad de pareja", originadas por estrellas masivas en el Universo temprano.
Supernova 2007bi, un evento potencial de inestabilidad de pares, tiene características que ahora se están reevaluando.

Objetivo del estudio:

Para investigar la naturaleza de dos SLSNe con propiedades observacionales inusuales.
Para determinar si estos SLSNe son consistentes con los modelos de inestabilidad de pares o mecanismos alternativos de explosión.
Reevaluar las características y la prevalencia de las supernovas de inestabilidad de pares.

Principales métodos:

Observación y análisis de las curvas y espectros de luz de dos SLSNe.
Comparación de los datos observados con modelos teóricos, incluida la inestabilidad de pares y las explosiones impulsadas por magnetares.
Evaluación de las implicaciones para la tasa de supernovas de inestabilidad de pares.

Principales resultados:

Dos SLSNe exhiben tiempos de subida rápidos y colores azules, inconsistentes con los modelos de inestabilidad de pares.
Las curvas y espectros de luz de los últimos tiempos muestran similitudes con la supernova 2007bi, lo que cuestiona su clasificación.
El modelado sugiere que las eyecciones magnetar-energizadas (10-16 masas solares) pueden explicar los fenómenos observados.
La tasa de eventos cercanos de inestabilidad de pares parece ser muy baja.

Conclusiones:

Es poco probable que los SLSNe observados sean eventos de inestabilidad de pares.
Las explosiones impulsadas por magnetar ofrecen un mecanismo alternativo plausible para estos SLSNe.
Los hallazgos sugieren que las supernovas de inestabilidad de pares pueden ser más raras de lo que se pensaba anteriormente.

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