Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Spectroscopic Study of Type Ibc Supernova Host Galaxies from
  Untargeted Surveys   We present the largest spectroscopic study of the host environments of Type
Ibc supernovae (SN Ibc) discovered exclusively by untargeted SN searches. Past
studies of SN Ibc host environments have been biased towards high-mass,
high-metallicity galaxies by focusing on SNe discovered in galaxy-targeted SN
searches. Our new observations more than double the total number of
spectroscopic stellar population age and metallicity measurements published for
untargeted SN Ibc host environments, and extend to a median redshift about
twice as large as previous statistical studies (z = 0.04). For the 12 SNe Ib
and 21 SNe Ic in our metallicity sample, we find median metallicities of
log(O/H)+12 = 8.48 and 8.61, respectively, but determine that the discrepancy
in the full distribution of metallicities is not statistically significant.
This median difference would correspond to only a small difference in the mass
loss via metal-line driven winds (<30%), suggesting this does not play the
dominant role in distinguishing SN Ib and Ic progenitors. However, the median
metallicity of the 7 broad-lined SN Ic (SN Ic-BL) in our sample is
significantly lower, log(O/H)+12 = 8.34. The age of the young stellar
population of SN Ic-BL host environments also seems to be lower than for SN Ib
and Ic, but our age sample is small. A synthesis of SN Ibc host environment
spectroscopy to date does not reveal a significant difference in SN Ib and Ic
metallicities, but reinforces the significance of the lower metallicities for
SN Ic-BL. This combined sample demonstrates that galaxy-targeted SN searches
introduce a significant bias for studies seeking to infer the metallicity
distribution of SN progenitors, and we identify and discuss other systematic
effects that play smaller roles. We discuss the path forward for making
progress on SN Ibc progenitor studies in the LSST era.

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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: cs
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The categories of this paper are: acc-phys