@article{aa26313dd96c42f78b904a32b1595343,
title = "Photometric properties of intermediate-redshift type Ia supernovae observed by the Sloan Digital Sky Survey-II Supernova Survey",
abstract = "We have analysed multiband light curves of 328 intermediate-redshift (0.05 ≤ z < 0.24) Type Ia supernovae (SNe Ia) observed by the Sloan Digital Sky Survey-II Supernova Survey. The multiband light curves were parametrized by using the multiband stretch method, which can simply parametrize light-curve shapes and peak brightness without dust extinction models. We found that most of the SNe Ia that appeared in red host galaxies (u − r > 2.5) do not have a broad light-curve width and the SNe Ia that appeared in blue host galaxies (u − r < 2.0) have a variety of light-curve widths. The Kolmogorov-Smirnov test shows that the colour distribution of SNe Ia appearing in red/blue host galaxies is different (a significance level of 99.9 per cent). We also investigate the extinction law of host galaxy dust. As a result, we find that the value of Rv derived from SNe Ia with medium light-curve widths is consistent with the standard Galactic value, whereas the value of Rv derived from SNe Ia that appear in red host galaxies becomes significantly smaller. These results indicate that there may be two types of SNe Ia with different intrinsic colours, and that they are obscured by host galaxy dust with two different properties.",
author = "N. Takanashi and M. Doi and N. Yasuda and H. Kuncarayakti and K. Konishi and Schneider, {D. P.} and D. Cinabro and J. Marriner",
note = "Funding Information: William Herschel Telescope is operated by the Isaac Newton Group on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The W. M. Keck Observatory is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. Funding Information: Funding for the creation and distribution of the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society and the Higher Education Funding Council for England. The SDSS web site is http://www.sdss.org/. This work was also supported in part by a Japan Society for the Promotion of Science (JSPS) core-to-core programme, 'International Research Network for Dark Energy', and by a JSPS research grant. We also acknowledge support by CONICYT through FONDECYT grant 3140563, and by Project IC120009 'Millennium Institute of Astrophysics (MAS)' of the Iniciativa Cient?fica Milenio del Ministerio de Econom?a, Fomento y Turismo de Chile. The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions. The Participating Institutions are the American Museum of Natural History, Astrophysical Institute Potsdam, University of Basel, Cambridge University, Case Western Reserve University, University of Chicago, Drexel University, Fermilab, the Institute for Advanced Study, the Japan Participation Group, Johns Hopkins University, the Joint Institute for Nuclear Astrophysics, the Kavli Institute for Particle Astrophysics and Cosmology, the Korean Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPA), the Max-Planck-Institute for Astrophysics (MPiA), New Mexico State University, Ohio State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory and the University of Washington. This work is based in part on observations made at the following telescopes. The Hobby-Eberly Telescope (HET) is a joint project of the University of Texas at Austin, Pennsylvania State University, Stanford University, Ludwig-Maximillians-Universit?t M?nchen and Georg-August-Universit?t G?ttingen. The HET is named in honour of its principal benefactors, William P. Hobby and Robert E. Eberly. The Marcario Low-Resolution Spectrograph is named for Mike Marcario of High Lonesome Optics, who fabricated several optical elements for the instrument but died before its completion; it is a joint project of the HET partnership and the Instituto de Astronom?a de la Universidad Nacional Aut?noma de M?xico. The Apache Point Observatory 3.5-m telescope is owned and operated by the Astrophysical Research Consortium. We thank the observatory director, Suzanne Hawley, and site manager, Bruce Gillespie, for their support of this project. The Subaru Telescope is operated by the National Astronomical Observatory of Japan. The William Herschel Telescope is operated by the Isaac Newton Group on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The W. M. Keck Observatory is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. We thank the SDSS collaborators for discussions and meaningful suggestions regarding this work. We also thank Michael Richmond for carefully reading the manuscript. Funding Information: Funding for the creation and distribution of the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the US Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society and the Higher Education Funding Council for England. The SDSS web site is http://www.sdss.org/. This work was also supported in part by a Japan Society for the Promotion of Science (JSPS) core-to-core programme, {\textquoteleft}International Research Network for Dark Energy{\textquoteright}, and by a JSPS research grant. We also acknowledge support by CONICYT through FONDECYT grant 3140563, and by Project IC120009 {\textquoteleft}Millennium Institute of Astrophysics (MAS){\textquoteright} of the Ini-ciativa Cient{\'i}fica Milenio del Ministerio de Econom{\'i}a, Fomento y Turismo de Chile. Publisher Copyright: {\textcopyright} 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society",
year = "2017",
month = feb,
day = "1",
doi = "10.1093/mnras/stw2730",
language = "English (US)",
volume = "465",
pages = "1274--1288",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",
}