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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The properties of SN Ib/c locations
Astronomy and Astrophysics, Volume 530, Article A95, Year 2011
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Description
Aims. We seek to gain a deeper understanding of stripped-envelope, core-collapse supernovae through studying their environments. Methods. We obtained low-resolution optical spectroscopy with the New Technology Telescope (+EFOSC2) at the locations of 20 type Ib/c supernovae. We measured the flux of emission lines in the stellar-continuum-subtracted spectra from which local metallicities are computed. For the supernova regions, we estimate both the mean stellar age, by interpreting the stellar absorption with population synthesis models, and the age of the youngest stellar populations using the Hα equivalent width as an age indicator. These estimates are compared with the lifetimes of single massive stars. Results. Based on our sample, we detect a tentative indication that type Ic supernovae might explode in environments that are more metal-rich than those of type Ib supernovae (average difference of 0.08 dex), but this is not a statistically significant result. The lower limits placed on the ages of the supernova birthplaces are generally young, although there are several cases where these appear older than what is expected for the evolution of single stars that are more massive than 25-30 M ⊙. This is only true, however, when assuming that the supernova progenitors were born during an instantaneous (not continuous) episode of star formation. Conclusions. These results do not conclusively favor any of the two evolutionary paths (single or binary) leading to stripped supernovae. We do note a fraction of events for which binary evolution is more likely due to their associated age limits; however, the supernova environments contain areas of recent (<15 Myr) star formation, and the environmental metallicities at least do not contradict the single evolutionary scenario, suggesting that this channel is also broadly consistent with the observations. © 2011 ESO.
Authors & Co-Authors
Leloudas, Giorgos
Denmark, Copenhagen
Niels Bohr Institutet
Gallazzi, Anna R.
Denmark, Copenhagen
Niels Bohr Institutet
Sollerman, Jesper
Sweden, Stockholm
Stockholms Universitet
Stritzinger, Maximilian D.
Sweden, Stockholm
Stockholms Universitet
Fynbo, Johan Peter Uldall
Denmark, Copenhagen
Niels Bohr Institutet
Hjorth, Jens
Denmark, Copenhagen
Niels Bohr Institutet
Malesani, Daniele B.
Denmark, Copenhagen
Niels Bohr Institutet
Michałowski, Michał J.
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Milvang-Jensen, Bo
Denmark, Copenhagen
Niels Bohr Institutet
Smith, Matthew W.L.
South Africa, Cape Town
University of Cape Town
Statistics
Citations: 73
Authors: 10
Affiliations: 4
Identifiers
Doi:
10.1051/0004-6361/201116692
ISSN:
00046361
e-ISSN:
14320746
Research Areas
Environmental
Study Design
Cross Sectional Study