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Abstract: This paper presents spectroscopy of supernovae discovered in the first seasonof the Sloan Digital Sky Survey-II Supernova Survey. This program searches forand measures multi-band light curves of supernovae in the redshift range z =0.05 - 0.4, complementing existing surveys at lower and higher redshifts. Ourgoal is to better characterize the supernova population, with a particularfocus on SNe Ia, improving their utility as cosmological distance indicatorsand as probes of dark energy. Our supernova spectroscopy program featuresrapid-response observations using telescopes of a range of apertures, andprovides confirmation of the supernova and host-galaxy types as well as preciseredshifts. We describe here the target identification and prioritization, datareduction, redshift measurement, and classification of 129 SNe Ia, 16spectroscopically probable SNe Ia, 7 SNe Ib-c, and 11 SNe II from the firstseason. We also describe our efforts to measure and remove the substantial hostgalaxy contamination existing in the majority of our SN spectra.



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

Source: https://arxiv.org/



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