Spectroscopic properties of star-forming host galaxies and type Ia supernova Hubble residuals in a nearly unbiased sample

Chris B. D'Andrea, Ravi R. Gupta, Masao Sako, Matt Morris, Robert C. Nichol, Peter J. Brown, Heather Campbell, Matthew D. Olmstead, Joshua A. Frieman, Peter Garnavich, Saurabh W. Jha, Richard Kessler, Hubert Lampeitl, John Marriner, Donald P. Schneider, Mathew Smith

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

We examine the correlation between supernova (SN) host-galaxy properties and their residuals in the Hubble diagram. We use SNe discovered during the Sloan Digital Sky Survey-II Supernova Survey, and focus on objects at a redshift of z < 0.15, where the selection effects of the survey are known to yield a complete Type Ia supernova (SNIa) sample. To minimize the bias in our analysis with respect to measured host-galaxy properties, spectra were obtained for nearly all hosts, spanning a range in magnitude of -23 < Mr < -17. In contrast to previous works that use photometric estimates of host mass as a proxy for global metallicity, we analyze host-galaxy spectra to obtain gas-phase metallicities and star formation rates (SFRs) from host galaxies with active star formation. From a final sample of ∼40 emission-line galaxies, we find that light-curve-corrected SNe Ia are ∼0.1mag brighter in high-metallicity hosts than in low-metallicity hosts. We also find a significant (>3σ) correlation between the Hubble Residuals of SNe Ia and the specific SFR of the host galaxy. We comment on the importance of SN/host-galaxy correlations as a source of systematic bias in future deep SN surveys.

Original languageEnglish (US)
Article number172
JournalAstrophysical Journal
Volume743
Issue number2
DOIs
StatePublished - Dec 20 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • cosmology: observations
  • galaxies: abundances
  • supernovae: general
  • surveys

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