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LSQ13dsm is a pre-maximum type Ia supernova, classification by FIRE near-infrared spectroscopy

ATel #5714; E. Y. Hsiao (LCO), M. Kasliwal (Carnegie), K. Krisciunas (Texas A&M), G. H. Marion (U Texas; CfA), C. Contreras, C. Gall, M. D. Stritzinger (Aarhus U), M. M. Phillips, N. Morrell (LCO), R. P. Kirshner (CfA), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, E. S. Walker (Yale U), U. Feindt (U. Bonn), P. E. Nugent (LBL, UC Berkeley)
on 1 Jan 2014; 20:53 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 LSQ13dsm using a near-infrared spectrum (range 800-2500 nm) obtained on Jan 1.21 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 LSQ13dsm is a young type Ia supernova at approximately z=0.04. The spectrum resembles the near-infrared spectra of SN 2011fe (PTF11kly, ATel #3581) between 6 and 9 days before maximum (Hsiao et al. 2013, Ap.J. 766, 72). We also obtained optical images with the Swope 1-m on Jan 1.07 UT. The un-subtracted B magnitude is 18.6. Adopting the distance modulus from the approximate supernova redshift and standard cosmology, the absolute B magnitude is approximately -17.5, consistent with a young type Ia supernova. The candidate was discovered on Dec 31 UT by the La Silla-Quest survey (ATel #3812), with non-detection on Dec 27 UT and coordinates RA 03:33:12.83 DEC -26:12:24.02.