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Spectroscopic classifications of ASASSN-17pr as a type Ia supernova in the foreground of merging galaxies

ATel #11019; S. Bose, Subo Dong (KIAA-PKU), D. A. H. Buckley (SAAO), M. Gromadzki (Warsaw), N. Morrell, J. Kollmeier, T. Holoien (Carnegie), J.-L. Prieto (Diego Portales; MAS), K. Z. Stanek (OSU)
on 27 Nov 2017; 23:32 UT
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)

Subjects: Supernovae

We report the optical spectroscopic observations of the supernova candidate ASASSN-17pr (2017ilu) discovered by by the All-Sky Automated Survey for SuperNovae (ASAS-SN: Shappee et al. 2014, ApJ, 788, 48). The discovery was reported in Atel #11018. We obtained four optical spectra, two of which were obtained using SALT/RSS (350.0-920.0 nm) on UT 2017-11-24.0 and 2017-11-26.0, and another two were obtained using Magellan Clay/LDSS3 on UT 2017-11-24.2 and 2017-11-25.1. We use SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to identify the spectroscopic type and phase of the SN.

The spectra match with normal SNe Ia at a few days before maximum. Multiple spectra were obtained to estimate the host galaxy redshift, which is found to be z=0.0615. The SN host in the foreground of an extended tail of the merging galaxy ESO 355-IG 012 (z=0.12 via NED). The SNID estimated redshift (z=0.062) is in good agreement with the host redshift.