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FIRE NIR spectroscopic classifications of ASASSN-15as

ATel #6920; N. Morrell, M. M. Phillips, C. Contreras, L. Busta (Las Campanas Observatory), E. Y. Hsiao (Aarhus University) on behalf of the Carnegie Supernova Project (CSP)
on 14 Jan 2015; 19:44 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Eric Hsiao (hsiao@lco.cl)

Subjects: Infra-Red, Optical, Supernovae

Referred to by ATel #: 6928

We report the spectroscopic classification of ASASSN-15as (ATel #6919) using a near-infrared spectrum (range 800-2500 nm) obtained on Jan 14.31 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-15as is a type Ia supernova near maximum. The near-infrared spectrum resembles those of SN 2001dl at -1 day (Marion et al. 2009) and SN 2011fe at -3 days (Hsiao et al. 2013). The H-band iron-peak complex has yet to form, so ASASSN-15as is most likely before maximum. The host is faint and its redshift is unknown. From the supernova features, the redshift is approximately 0.03. However, we caution that redshifts from near-infrared supernova features have large uncertainties. Photometry obtained with the 1-m Swope Telescope on Jan. 14.26 UT yielded: u = 16.931 +/- 0.016, g = 16.245 +/- 0.012, r = 16.349 +/- 0.014, i = 17.020 +/- 0.019, B = 16.340 +/- 0.013, V = 16.327 +/- 0.014.