A1 Refereed original research article in a scientific journal
Type II supernovae in low-luminosity host galaxies
Authors: Gutierrez CP, Anderson JP, Sullivan M, Dessart L, Gonzalez-Gaitan S, Galbany L, Dimitriadis G, Arcavi I, Bufano F, Chen TW, Dennefeld M, Gromadzki M, Haislip JB, Hosseinzadeh G, Howell DA, Inserra C, Kankare E, Leloudas G, Maguire K, McCully C, Morrell N, Olivares F, Pignata G, Reichart DE, Reynolds T, Smartt SJ, Sollerman J, Taddia F, Takats K, Terreran G, Valenti S, Young DR
Publisher: OXFORD UNIV PRESS
Publication year: 2018
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 479
Issue: 3
First page : 3232
Last page: 3253
Number of pages: 22
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/sty1581
We present an analysis of a new sample of type II core-collapse supernovae (SNe II) occurring within low-luminosity galaxies, comparing these with a sample of events in brighter hosts. Our analysis is performed comparing SN II spectral and photometric parameters and estimating the influence of metallicity (inferred from host luminosity differences) on SN II transient properties. We measure the SN absolute magnitude at maximum, the light-curve plateau duration, the optically thick duration, and the plateau decline rate in the V band, together with expansion velocities and pseudo-equivalent-widths (pEWs) of several absorption lines in the SN spectra. For the SN host galaxies, we estimate the absolute magnitude and the stellar mass, a proxy for the metallicity of the host galaxy. SNe II exploding in low-luminosity galaxies display weaker pEWs of Fe II lambda 5018, confirming the theoretical prediction that metal lines in SN II spectra should correlate with metallicity. We also find that SNe II in low-luminosity hosts have generally slower declining light curves and display weaker absorption lines. We find no relationship between the plateau duration or the expansion velocities with SN environment, suggesting that the hydrogen envelope mass and the explosion energy are not correlated with the metallicity of the host galaxy. This result supports recent predictions that mass-loss for red supergiants is independent of metallicity.
