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

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

doi:10.1088/0004-637X/743/2/172

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

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

Institute of Cosmology & Gravitation

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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 (SN Ia) 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 ~0.1 mag 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 language	English
Pages (from-to)	172
Journal	The Astrophysical Journal
Volume	743
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/743/2/172
Publication status	Published - 20 Dec 2011

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D'Andrea, C., Gupta, R. R., Sako, M., Morris, M., Nichol, R. C., Brown, P. J., Campbell, H. C., Olmstead, M. D., Frieman, J. A., Garnavich, P. M., Jha, S. W., Kessler, R., Lampeitl, H., Marriner, J. P., Schneider, D. P., & Smith, M. (2011). Spectroscopic properties of star-forming host galaxies and Type Ia supernova hubble residuals in a nearly unbiased sample. The Astrophysical Journal, 743(2), 172. https://doi.org/10.1088/0004-637X/743/2/172

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title = "Spectroscopic properties of star-forming host galaxies and Type Ia supernova hubble residuals in a nearly unbiased sample",

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 (SN Ia) 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 ~0.1 mag 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.",

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

year = "2011",

month = dec,

day = "20",

doi = "10.1088/0004-637X/743/2/172",

language = "English",

volume = "743",

pages = "172",

journal = "The Astrophysical Journal",

issn = "0004-637X",

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D'Andrea, C, Gupta, RR, Sako, M, Morris, M, Nichol, RC, Brown, PJ, Campbell, HC, Olmstead, MD, Frieman, JA, Garnavich, PM, Jha, SW, Kessler, R, Lampeitl, H, Marriner, JP, Schneider, DP & Smith, M 2011, 'Spectroscopic properties of star-forming host galaxies and Type Ia supernova hubble residuals in a nearly unbiased sample', The Astrophysical Journal, vol. 743, no. 2, pp. 172. https://doi.org/10.1088/0004-637X/743/2/172

TY - JOUR

T1 - Spectroscopic properties of star-forming host galaxies and Type Ia supernova hubble residuals in a nearly unbiased sample

AU - D'Andrea, Chris

AU - Gupta, Ravi R.

AU - Sako, Masao

AU - Morris, Matt

AU - Nichol, Robert C.

AU - Brown, Peter J.

AU - Campbell, Heather C.

AU - Olmstead, Matthew D.

AU - Frieman, Joshua A.

AU - Garnavich, Peter M.

AU - Jha, Saurabh W.

AU - Kessler, Richard

AU - Lampeitl, Hubert

AU - Marriner, John P.

AU - Schneider, Donald P.

AU - Smith, Mathew

PY - 2011/12/20

Y1 - 2011/12/20

N2 - 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 (SN Ia) 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 ~0.1 mag 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.

AB - 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 (SN Ia) 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 ~0.1 mag 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.

U2 - 10.1088/0004-637X/743/2/172

DO - 10.1088/0004-637X/743/2/172

M3 - Article

SN - 0004-637X

VL - 743

SP - 172

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

ER -

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

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