Detalle del registro

Type II Plateau supernovae as metallicity probes of the Universe

Universidad de Chile. Repositorio Académico

Título Type II Plateau supernovae as metallicity probes of the Universe
Autor Anderson, J.P.
Dessart, L.
Gutiérrez, Claudia P.
Persson, S. E.
Lanz, T.
Phillips, M. M.
Folatelli, G.
Morrell, N.
Hillier, D. J.
Suntzef, N. B.
Freedman, W. L.
Stritzinger, M.
Ley, F.
Hamuy Wackenhut, Mario Andrés
Tema radiative transfer
Descripción Artículo de publicación ISI.
We explore a method for metallicity determinations based on quantitative spectroscopy of
Type II-Plateau supernovae (SNe II-P). For consistency, we first evolve a set of 15 M
main-sequence stars at 0.1, 0.4, 1, and 2 times the solar metallicity. At the onset of core
collapse, we trigger a piston-driven explosion and model the resulting ejecta and radiation.
Our theoretical models of such red supergiant star explosions at different metallicity show that
synthetic spectra of SNe II-P possess optical signatures during the recombination phase that
are sensitive to metallicity variations. This sensitivity can be quantified and the metallicity
inferred from the strengths of metal-line absorptions. Furthermore, these signatures are not
limited to O, but also include Na, Ca, Sc, Ti, or Fe. When compared to a sample of SNe II-P
from the Carnegie SN Project and previous SN followup programmes, we find that most events
lie at a metallicity between 0.4 and 2 times solar, with a marked scarcity of SN II-P events
at small magellanic cloud metallicity. This most likely reflects the paucity of low-metallicity
star-forming regions in the local Universe.
SNe II-P have high-plateau luminosities that make them observable spectroscopically at
large distances. Because they exhibit signatures of diverse metal species, in the future they
may offer a means to constrain the evolution of the composition (e.g. the O/Fe ratio) in the
Universe out to a redshift of 1 and beyond.
Fecha 2014-10-14T19:36:38Z
Tipo Artículo de revista
Enlace MNRAS 440, 1856–1864 (2014)
Idioma en_US
Derechos Attribution-NonCommercial-NoDerivs 3.0 Chile