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The host galaxies of Type Ia supernovae discovered by the Palomar Transient Factory

The host galaxies of Type Ia supernovae discovered by the Palomar Transient Factory
The host galaxies of Type Ia supernovae discovered by the Palomar Transient Factory
We present spectroscopic observations of the host galaxies of 82 low-redshift Type Ia supernovae (SNe Ia) discovered by the Palomar Transient Factory. We determine star formation rates, gas-phase/stellar metallicities, and stellar masses and ages of these objects. As expected, strong correlations between the SN Ia light-curve width (stretch) and the host age/mass/metallicity are found: fainter, faster declining events tend to be hosted by older/massive/metal-rich galaxies. There is some evidence that redder SNe Ia explode in higher metallicity galaxies, but we found no relation between the SN colour and host galaxy extinction based on the Balmer decrement, suggesting that the colour variation of these SNe does not primarily arise from this source. SNe Ia in higher mass/metallicity galaxies also appear brighter after stretch/colour corrections than their counterparts in lower mass hosts, and the stronger correlation is with gas-phase metallicity suggesting this may be the more important variable. We also compared the host stellar mass distribution to that in galaxy-targeted SN surveys and the high-redshift untargeted Supernova Legacy Survey (SNLS). SNLS has many more low-mass galaxies, while the targeted searches have fewer. This can be explained by an evolution in the galaxy stellar mass function, coupled with an SN delay-time distribution proportional to t?1. Finally, we found no significant difference in the mass–metallicity relation of our SN Ia hosts compared to field galaxies, suggesting any metallicity effect on the SN Ia rate is small.
0035-8711
1391-1416
Pan, Y.- C.
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Sullivan, M.
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Maguire, K.
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Hook, I.M.
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Nugent, P.E.
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Howell, D.A.
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Arcavi, I.
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Botyanszki, J.
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Cenko, S.B.
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DeRose, J.
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Fakhouri, H.K.
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Gal-Yam, A.
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Hsiao, E.
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Kulkarni, S.R.
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Laher, R.R.
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Lidman, C.
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Nordin, J.
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Walker, E.S.
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Xu, D.
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Pan, Y.- C.
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Sullivan, M.
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Maguire, K.
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Hook, I.M.
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Nugent, P.E.
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Howell, D.A.
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Arcavi, I.
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Botyanszki, J.
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Cenko, S.B.
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DeRose, J.
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Fakhouri, H.K.
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Gal-Yam, A.
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Hsiao, E.
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Kulkarni, S.R.
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Laher, R.R.
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Lidman, C.
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Nordin, J.
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Walker, E.S.
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Xu, D.
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Pan, Y.- C., Sullivan, M., Maguire, K., Hook, I.M., Nugent, P.E., Howell, D.A., Arcavi, I., Botyanszki, J., Cenko, S.B., DeRose, J., Fakhouri, H.K., Gal-Yam, A., Hsiao, E., Kulkarni, S.R., Laher, R.R., Lidman, C., Nordin, J., Walker, E.S. and Xu, D. (2014) The host galaxies of Type Ia supernovae discovered by the Palomar Transient Factory. Monthly Notices of the Royal Astronomical Society, 438 (2), 1391-1416. (doi:10.1093/mnras/stt2287).

Record type: Article

Abstract

We present spectroscopic observations of the host galaxies of 82 low-redshift Type Ia supernovae (SNe Ia) discovered by the Palomar Transient Factory. We determine star formation rates, gas-phase/stellar metallicities, and stellar masses and ages of these objects. As expected, strong correlations between the SN Ia light-curve width (stretch) and the host age/mass/metallicity are found: fainter, faster declining events tend to be hosted by older/massive/metal-rich galaxies. There is some evidence that redder SNe Ia explode in higher metallicity galaxies, but we found no relation between the SN colour and host galaxy extinction based on the Balmer decrement, suggesting that the colour variation of these SNe does not primarily arise from this source. SNe Ia in higher mass/metallicity galaxies also appear brighter after stretch/colour corrections than their counterparts in lower mass hosts, and the stronger correlation is with gas-phase metallicity suggesting this may be the more important variable. We also compared the host stellar mass distribution to that in galaxy-targeted SN surveys and the high-redshift untargeted Supernova Legacy Survey (SNLS). SNLS has many more low-mass galaxies, while the targeted searches have fewer. This can be explained by an evolution in the galaxy stellar mass function, coupled with an SN delay-time distribution proportional to t?1. Finally, we found no significant difference in the mass–metallicity relation of our SN Ia hosts compared to field galaxies, suggesting any metallicity effect on the SN Ia rate is small.

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Accepted/In Press date: 21 November 2013
e-pub ahead of print date: 20 December 2013
Published date: 21 February 2014
Organisations: Astronomy Group

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Local EPrints ID: 394584
URI: https://eprints.soton.ac.uk/id/eprint/394584
ISSN: 0035-8711
PURE UUID: 100ba58c-531d-4f22-b2a4-bdb471fbf9a2
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 20 May 2016 13:59
Last modified: 06 Jun 2018 12:27

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Contributors

Author: Y.- C. Pan
Author: M. Sullivan ORCID iD
Author: K. Maguire
Author: I.M. Hook
Author: P.E. Nugent
Author: D.A. Howell
Author: I. Arcavi
Author: J. Botyanszki
Author: S.B. Cenko
Author: J. DeRose
Author: H.K. Fakhouri
Author: A. Gal-Yam
Author: E. Hsiao
Author: S.R. Kulkarni
Author: R.R. Laher
Author: C. Lidman
Author: J. Nordin
Author: E.S. Walker
Author: D. Xu

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