Subaru Spectroscopy of SDSS-II Supernovae
Abstract
The Sloan Digital Sky Survey II (SDSS-II) Supernova Survey discovered Type Ia supernovae (SNe Ia) in an almost unexplored intermediate redshift range of and provided densely sampled multi-color light curves for SN candidates. Followup spectroscopy of this survey was carried out with the Subaru telescope and spectra of 71 SN Ia candidates were obtained. One spectrum was observed per candidate except for a peculiar variable. This paper presents the method for processing these spectra. The observed wavelength ranges of our spectra are 4000 to 9000 {\AA} for Year 2005 and 3600 to 9000 {\AA} for Year 2006. Most SN Ia spectra have signal to noise ratios (S/N) between 4 and 10 per 2 {\AA} averaged over the entire wavelength region. We developed a new code to extract the SN spectral component from spectra contaminated by the host galaxy. Of 71 SN Ia candidates, 59 are identified as normal SNe Ia and 3 are peculiar SNe Ia. The range of spectral phases varies from -7 days to +30 days from maximum brightness. There are also 7 SNe II, 1 possible hypernova and 1 AGN.
Cite
@article{arxiv.1101.1565,
title = {Subaru Spectroscopy of SDSS-II Supernovae},
author = {Kohki Konishi and Naoki Yasuda and Kouichi Tokita and Mamoru Doi and Yutaka Ihara and Tomoki Morokuma and Naohiro Takanashi and Jakob Nordin and John Marriner and Linda Östman and Michael Richmond and Masao Sako and Donald P. Schneider and J. Craig Wheeler},
journal= {arXiv preprint arXiv:1101.1565},
year = {2011}
}
Comments
33 pages, 8 figures, 6 table. Submitted to Astronomical Journal