Subaru Spectroscopy of SDSS-II Supernovae

Journal Article · Sat Jan 01 00:00:00 EST 2011 · TBD

OSTI ID:1967989

Konishi, Kohki ^[1]; Yasuda, Naoki ^[2]; Tokita, Kouichi ^[3]; Doi, Mamoru ^[3]; Ihara, Yutaka ^[3]; Morokuma, Tomoki ^[4]; Takanashi, Naohiro ^[3]; Nordin, Jakob ^[5]; Marriner, John  ^[6]; Ostman, Linda ^[7]; Richmond, Michael  ^[8]; Sako, Masao  ^[9]; Schneider, Donald P. ^[10]; Wheeler, J.Craig  ^[11]

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1. Tokyo U.; Tokyo U., ICRR
2. Tokyo U., ICRR
3. Tokyo U.
4. Natl. Astron. Observ. of Japan
5. Stockholm U.; Stockholm U., OKC
6. Fermilab
7. Barcelona, IFAE
8. Rochester Inst. Tech.
9. Pennsylvania U.
10. Penn State U.
11. Texas U.

The Sloan Digital Sky Survey II (SDSS-II) Supernova Survey discovered Type Ia supernovae (SNe Ia) in an almost unexplored intermediate redshift range of $0.05 < z < 0.4$ 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.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1967989
• Report Number(s): FERMILAB-PUB-11-917-A; arXiv:1101.1565; oai:inspirehep.net:883793
• Journal Information: TBD, Journal Name: TBD
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS