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Core-Collapse Supernovae from the Palomar Transient Factory: Indications for a Different Population in Dwarf Galaxies | | Iair Arcavi
; Avishay Gal-Yam
; Mansi M. Kasliwal
; Robert M. Quimby
; Eran O. Ofek
; Shrinivas R. Kulkarni
; Peter E. Nugent
; S. Bradley Cenko
; Joshua S. Bloom
; Mark Sullivan
; D. Andrew Howell
; Dovi Poznanski
; Alexei V. Filippenko
; Nicholas Law
; Isobel Hook
; Jakob Jonsson
; Sarah Blake
; Jeff Cooke
; Richard Dekany
; Gustavo Rahmer
; David Hale
; Roger Smith
; Jeff Zolkower
; Viswa Velur
; Richard Walters
; John Henning
; Kahn Bui
; Dan McKenna
; Janet Jacobsen
; | | Date: |
5 Apr 2010 | | Abstract: | We use the first compilation of 72 core-collapse supernovae (SNe) from the
Palomar Transient Factory (PTF) to study their observed subtype distribution in
dwarf galaxies compared to giant galaxies. The nature of the PTF survey
provides a minimally biased sample, rich in SNe from dwarf hosts, with
spectroscopic classifications. With 15 events detected in dwarf galaxies, our
results are still limited by small-number statistics. However, several
interesting trends emerge. We find more core-collapse SNe in dwarf galaxies
than expected, with a similar N(Ib/c)/N(II) ratio in dwarf and giant hosts
(0.25_{-0.15}^{+0.3} and 0.23_{-0.08}^{+0.11}, respectively), although our
uncertainties (1 sigma) are still too large to distinguish between these
results and those of previous studies and theoretical predictions. We use
detailed subclassifications of stripped-envelope core-collapse SNe and find
that all Type I core-collapse events occurring in dwarf galaxies are either SNe
Ib or broad-lined SNe Ic (SNe Ic-BL), while "normal" SNe Ic dominate in giant
galaxies. We also see a significant excess of SNe IIb in dwarf hosts. We
hypothesize that in lower metallicity hosts, metallicity-driven mass loss is
reduced, allowing massive stars that would have appeared as "normal" SNe Ic in
metal-rich galaxies to retain some He and H, exploding as Ib/IIb events. At the
same time, another mechanism allows some stars to undergo extensive stripping
and explode as SNe Ic-BL (and presumably also as long-duration gamma-ray
bursts). As additional PTF data accumulate, more robust statistical analyses
will be possible, allowing the evolution of massive stars to be probed via the
dwarf-galaxy SN population. | | Source: | arXiv, 1004.0615 | | Services: | Forum | Review | PDF | Favorites | |
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