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Una inusual estrella enana blanca puede ser un remanente sobreviviente de una supernova de tipo Ia subluminosa

S Vennes¹, P Nemeth^2,3, A Kawka⁴

¹Astronomický ústav, Akademie věd České republiky, Fričova 298, CZ-251 65 Ondřejov, Czech Republic. vennes@asu.cas.cz.

Science (New York, N.Y.)

|August 19, 2017

Resumen

Los investigadores descubrieron una estrella enana blanca expulsada a alta velocidad, apoyando la teoría de que algunas supernovas subluminosas de tipo Ia dejan restos unidos. Este hallazgo refuerza el modelo de un solo degenerado para los progenitores de supernovas.

Área de la Ciencia:

Astronomía y astrofísica
Evolución estelar
Las supernovas

Sus antecedentes:

Las supernovas subluminosas Tipo Ia, incluida la Tipo Iax, están modeladas por varios escenarios que involucran estrellas enanas blancas en acreción.
Estos modelos sugieren que los restos estelares unidos pueden sobrevivir a estas explosiones con velocidades significativas.

Objetivo del estudio:

Para investigar el origen de la peculiar enana blanca LP 40-365.
Para probar las predicciones teóricas de los restos de supernovas subluminosas Tipo Ia.

Principales métodos:

Descubrimiento y caracterización de la enana blanca LP 40-365 utilizando su alto movimiento propio y su peculiar composición atmosférica.
Análisis de su velocidad relativa a la velocidad de escape galáctico.

Principales resultados:

Se identificó a LP 40-365 como una enana blanca de baja masa con una atmósfera única rica en elementos de masa intermedia.
Determinado que LP 40-365 excede la velocidad de escape galáctico, lo que indica una alta velocidad de eyección.
Encontramos una fuerte evidencia que sugiere que el LP 40-365 es un remanente de un evento de supernova subluminosa Tipo Ia.

Conclusiones:

El descubrimiento de LP 40-365 proporciona apoyo observacional para la existencia de restos unidos de supernovas subluminosas de tipo Ia.
Este hallazgo refuerza la viabilidad del modelo progenitor de un solo degenerado para estos tipos de explosiones estelares.

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