Journal
ASTROPHYSICAL JOURNAL
Volume 770, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/770/2/108
Keywords
dark energy; supernovae: general
Categories
Funding
- NASA [NAS5-98034]
- GALEX Archival Research Grant [08-GALEX508-0008]
- Office of Science, Office of High Energy Physics, of the U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. Department of Energy Scientific Discovery through Advanced Computing (SciDAC) program [DE-FG02-06ER06-04]
- Gordon & Betty Moore Foundation
- CNRS/IN2P3 France
- CNRS/INSU France
- PNC France
- DFG Germany [TRR33]
- Henri Chretien International Research Grant
- France-Berkeley Fund
- Explora'Doc Grant by the Region Rhone Alpes
- Office of Science, Office of Advanced Scientific Computing Research, of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [ANI-0087344]
- University of California, San Diego
- Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) [CE110001020]
- W. M. Keck Foundation
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
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We examine the relationship between Type Ia supernova (SN Ia) Hubble residuals and the properties of their host galaxies using a sample of 115 SNe Ia from the Nearby Supernova Factory. We use host galaxy stellar masses and specific star formation rates fitted from photometry for all hosts, as well as gas-phase metallicities for a subset of 69 star-forming (non-active galactic nucleus) hosts, to show that the SN Ia Hubble residuals correlate with each of these host properties. With these data we find new evidence for a correlation between SN Ia intrinsic color and host metallicity. When we combine our data with those of other published SN Ia surveys, we find the difference between mean SN Ia brightnesses in low- and high-mass hosts is 0.077 +/- 0.014 mag. When viewed in narrow (0.2 dex) bins of host stellar mass, the data reveal apparent plateaus of Hubble residuals at high and low host masses with a rapid transition over a short mass range (9.8 <= log(M*/M-circle dot) <= 10.4). Although metallicity has been a favored interpretation for the origin of the Hubble residual trend with host mass, we illustrate how dust in star-forming galaxies and mean SN Ia progenitor age both evolve along the galaxy mass sequence, thereby presenting equally viable explanations for some or all of the observed SN Ia host bias.
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