Core-collapse, superluminous, and gamma-ray burst supernova host galaxy populations at low redshift: the importance of dwarf and starbursting galaxies. (arXiv:1911.09112v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Taggart_K/0/1/0/all/0/1">Kirsty Taggart</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Perley_D/0/1/0/all/0/1">Daniel Perley</a>

We present a comprehensive study of an unbiased sample of 84 nearby ( =
0.018) core-collapse supernova (CCSN) host galaxies drawn from the All-Sky
Automated Survey for Supernovae (ASAS-SN) for direct comparison to the nearest
LGRB and SLSN hosts. We use public imaging surveys to gather multi-wavelength
photometry for all CCSN host galaxies and fit their spectral energy
distributions (SEDs) to derive stellar masses and integrated star formation
rates. CCSNe populate galaxies across a wide range of stellar masses, from blue
and compact dwarf galaxies to large spiral galaxies. We find 40(+6,-5) per cent
of CCSNe are in dwarf galaxies (M < 10^9 M_Sun) and 2(+3,-1) per cent are in dwarf starburst galaxies (sSFR > 10^-8 yr^-1). We reanalyse the low-redshift
SLSN and LGRB hosts from the literature (out to z < 0.3) in a homogeneous way and compare against the CCSN host sample. We find that the relative SLSN to CCSN supernova rate is increased in low-mass galaxies and at high specific star-formation rates. These parameters are strongly covariant and we cannot break the degeneracy between them with our current sample. Larger unbiased samples of CCSNe from projects such as ZTF and LSST will be needed to determine whether host-galaxy mass (a proxy for metallicity) or specific star-formation rate (a proxy for star-formation intensity and potential IMF variation) is more fundamental in driving the preference for SLSNe and LGRBs in unusual galaxy environments.

We present a comprehensive study of an unbiased sample of 84 nearby (<z> =
0.018) core-collapse supernova (CCSN) host galaxies drawn from the All-Sky
Automated Survey for Supernovae (ASAS-SN) for direct comparison to the nearest
LGRB and SLSN hosts. We use public imaging surveys to gather multi-wavelength
photometry for all CCSN host galaxies and fit their spectral energy
distributions (SEDs) to derive stellar masses and integrated star formation
rates. CCSNe populate galaxies across a wide range of stellar masses, from blue
and compact dwarf galaxies to large spiral galaxies. We find 40(+6,-5) per cent
of CCSNe are in dwarf galaxies (M < 10^9 M_Sun) and 2(+3,-1) per cent are in
dwarf starburst galaxies (sSFR > 10^-8 yr^-1). We reanalyse the low-redshift
SLSN and LGRB hosts from the literature (out to z < 0.3) in a homogeneous way
and compare against the CCSN host sample. We find that the relative SLSN to
CCSN supernova rate is increased in low-mass galaxies and at high specific
star-formation rates. These parameters are strongly covariant and we cannot
break the degeneracy between them with our current sample. Larger unbiased
samples of CCSNe from projects such as ZTF and LSST will be needed to determine
whether host-galaxy mass (a proxy for metallicity) or specific star-formation
rate (a proxy for star-formation intensity and potential IMF variation) is more
fundamental in driving the preference for SLSNe and LGRBs in unusual galaxy
environments.

http://arxiv.org/icons/sfx.gif