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Distancias con una precisión de <4% desde supernovas de tipo Ia en entornos de formación estelar joven
Patrick L Kelly1, Alexei V Filippenko2, David L Burke3
1Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA. pkelly@astro.berkeley.edu.
Science (New York, N.Y.)
|March 28, 2015
Resumen
Las luminosidades de las supernovas de tipo Ia (SNe Ia) se correlacionan con su color y velocidad de desvanecimiento. La identificación de SNe Ia en entornos de alta UV utilizando datos GALEX permitió una calibración precisa de la distancia (<4%), revelando una propiedad progenitora primaria que rige sus características.
Área de la Ciencia:
- Cosmología Cosmología.
- La astrofísica es la astrofísica.
- Evolución Estelar Evolución Estelar
Sus antecedentes:
- Las supernovas de tipo Ia (SNe Ia) son herramientas cosmológicas cruciales, pero sus variaciones de luminosidad requieren una calibración cuidadosa.
- Las explosiones termonucleares de las estrellas enanas blancas, SNe Ia, exhiben variaciones sistemáticas relacionadas con el color intrínseco y las tasas de desintegración de la curva de luz.
Objetivo del estudio:
- Para identificar y calibrar las supernovas de tipo Ia (SNe Ia) en entornos con alto brillo superficial ultravioleta (UV).
- Mejorar la precisión de las mediciones de distancia para SNe Ia aprovechando las propiedades de sus galaxias anfitrionas.
Principales métodos:
- Utilizó el satélite Galaxy Evolution Explorer (GALEX) para identificar SNe Ia en regiones de alto brillo superficial UV y densidad de formación estelar.
- Se aplicó una ley de extinción del modelo empinado y curvas de luz óptica de banda ancha para una calibración precisa de SNe Ia.
- Analizó la relación entre las propiedades de las supernovas, incluyendo el ancho de la curva de luz, el color y la luminosidad.
Principales resultados:
- Se logró una calibración de distancia para SNe Ia dentro de aproximadamente 0.065 a 0.075 magnitud (<4% de incertidumbre de distancia).
- Se observó una dispersión apretada en las supernovas calibradas, lo que sugiere un factor dominante que influye en su luminosidad.
- Se identificó una correlación entre las propiedades de SNe Ia y sus entornos de erupción.
Conclusiones:
- La calibración precisa de SNe Ia en entornos de alta UV reduce significativamente las incertidumbres de distancia.
- Es probable que una pequeña dispersión en las edades de los progenitores sea responsable de la dispersión apretada observada en las propiedades de SNe Ia.
- Una propiedad progenitora única parece ser el principal impulsor de las relaciones observadas entre el ancho de la curva de luz, el color y la luminosidad en SNe Ia.
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