First-year spectroscopy for the Sloan Digital Sky Survey-II supernova survey

Chen Zheng, Roger W. Romani, Masao Sako, John P. Marriner, Bruce A. Bassett, Andrew C. Becker, Changsu Choi, David Cinabro, Fritz Dejongh, Darren L. Depoy, Benjamin Dilday, Mamoru Doi, Joshua A. Frieman, Peter M. Garnavich, Craig J. Hogan, Jon A. Holtzman, Myungshin Im, Saurabh W. Jha, Richard Kessler, Kohki KonishiHubert Lampeitl, Jennifer L. Marshall, David McGinnis, Gajus Miknaitis, Robert C. Nichol, Jose Luis Prieto, Adam G. Riess, Michael W. Richmond, Donald P. Schneider, Mathew Smith, Naohiro Takanashi, Kouichi Tokita, Kurt J. van der Heyden, Naoki Yasuda, Roberto J. Assef, John C. Barentine, Ralf Bender, Roger D. Blandford, Malcolm Bremer, Howard J. Brewington, Chris A. Collins, Arlin Crotts, Jack Dembicky, Jason Eastman, Alastair C. Edge, Edward Elson, Michael E. Eyler, Alexei V. Filippenko, Ryan J. Foley, Stephan Frank, Ariel Goobar, Michael Harvanek, Ulrich Hopp, Yutaka Ihara, Steven Kahn, William Ketzeback, Scott J. Kleinman, Wolfram Kollatschny, Jurek Krzesinski, Giorgos Leloudas, Daniel C. Long, John Lucey, Elena Malanushenko, Viktor Malanushenko, Russet J. McMillan, Christopher W. Morgan, Tomoki Morokuma, Atsuko Nitta, Linda Ostman, Kaike Pan, A. Kathy Romer, Gabrelle Saurage, Katharine J. Schlesinger, Stephanie A. Snedden, Jesper Sollerman, Maximilian D. Stritzinger, Linda C. Watson, Shannon Watters, J. Craig Wheeler, Donald G. York

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Abstract

This paper presents spectroscopy of supernovae (SNe) discovered in the first season of the Sloan Digital Sky Survey-II SN Survey. This program searches for and measures multi-band light curves of SNe in the redshift range z = 0.05-0.4, complementing existing surveys at lower and higher redshifts. Our goal is to better characterize the SN population, with a particular focus on SNe Ia, improving their utility as cosmological distance indicators and as probes of dark energy. Our SN spectroscopy program features rapid-response observations using telescopes of a range of apertures, and provides confirmation of the SN and host-galaxy types as well as precise redshifts. We describe here the target identification and prioritization, data reduction, redshift measurement, and classification of 129 SNe Ia, 16 spectroscopically probable SNe Ia, 7 SNe Ib/c, and 11 SNe II from the first season. We also describe our efforts to measure and remove the substantial host-galaxy contamination existing in the majority of our SN spectra.
Original languageEnglish
Pages (from-to)1766-1784
JournalThe Astronomical Journal
Volume135
Issue number5
DOIs
Publication statusPublished - 1 May 2008

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