First-Year Spectroscopy for the SDSS-II Supernova Survey

Chen Zheng , Roger W. Romani , Masao Sako , John Marriner , Bruce Bassett , Andrew Becker , Changsu Choi , David Cinabro

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Fritz DeJongh Darren L. Depoy Ben Dilday Mamoru Doi Joshua A. Frieman Peter M. Garnavich Craig J. Hogan Jon Holtzman Myungshin Im Saurabh Jha Richard Kessler Kohki Konishi Hubert 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 van der Heyden Naoki Yasuda Roberto J. Assef John Barentine Ralf Bender Roger D. Blandford Malcolm Bremer Howard Brewington Chris A. Collins Arlin Crotts Jack Dembicky Jason Eastman Alastair Edge Ed 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 Krzesi\'nski 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 Katie Schlesinger Stephanie A. Snedden Jesper Sollerman Maximilian Stritzinger Linda C. Watson Shannon Watters J. Craig Wheeler Donald York

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keywords supernovaspectroscopydescribeexistingfirstprogramrangeredshift

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This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band light curves of supernovae in the redshift range z = 0.05 - 0.4, complementing existing surveys at lower and higher redshifts. Our goal is to better characterize the supernova population, with a particular focus on SNe Ia, improving their utility as cosmological distance indicators and as probes of dark energy. Our supernova spectroscopy program features rapid-response observations using telescopes of a range of apertures, and provides confirmation of the supernova 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.

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First-Year Spectroscopy for the SDSS-II Supernova Survey

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