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FIRE NIR spectroscopic classifications of ASASSN-15fy

ATel #7354; N. Morrell, M. M. Phillips (Las Campanas Observatory), E. Y. Hsiao, Maximilian Stritzinger (Aarhus University) on behalf of the Carnegie Supernova Project (CSP)
on 8 Apr 2015; 02:08 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Eric Hsiao (hsiao@lco.cl)

Subjects: Infra-Red, Optical, Supernovae

We report the spectroscopic classification of ASASSN-15fy (ATel #7348) using a near-infrared spectrum (range 800-2500 nm) obtained on Apr 7.41 UT with the FoldedPort Infrared Echellette (FIRE) spectrograph on the 6.5-m Magellan Baade Telescope at Las Campanas Observatory. The near-infrared spectrum shows that ASASSN-15fy is a type Ia supernova past maximum. The near-infrared spectrum resembles those of SN 2004da at 18 day (Marion et al. 2009) and SN 2011fe at 17 days (Hsiao et al. 2013). The H-band iron-peak complex and Co II lines in the K band have already formed, so ASASSN-15fy is most likely several weeks past maximum. The host is faint and its redshift is unknown. From the supernova features, the redshift is approximately 0.025. However, we caution that redshifts from near-infrared supernova features have large uncertainties.