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Spectrocopic Classifcations of AT 2017gqd and AT 2017gqe by Baade/IMACS

ATel #10727; Lingzhi Wang (NAOC/CASSACA), Nidia Morrell (LCO), Eric Hsiao (Florida State University), Joseph Anderson (ESO), Tiara Diamond (GSFC), Francisco Forster Buron (Uchile/CMM), Santiago Gonzalez (UChile/CMM), Lluís Galbany (UChile), Jose L. Prieto (UDP), Alessandro Razza (UChile), Xiaofeng Wang (Tsinghua University)
on 10 Sep 2017; 13:54 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

Subjects: Optical, Supernovae, Transient

On Sept. 08 2017, classification spectra were obtained for SN candidates AT 2017gqd and AT 2017gqe, with the 6.5-m Baade + IMACS(range 390-800nm; resolution: 5 Angstrom). We classify them as low-luminosity Type Ia Supernova and normal one at 2-3 weeks after the maximum light, respectively, by cross-correlating with a library of supernova spectra (SNID, Blondin & Tonry 2007, ApJ, 666, 1024). Details of our identifications are reported as below:

Survey Name | IAU Name | Discovery (UT) | Discovery mag | Observation (UT) | Redshift | Type | Phase | Notes
Gaia17cgk | SN 2017gqd | 2017-09-06 05:51:21 | 18.77 | 2017-09-08 09:39:10 | 0.061 |91bg-like Ia | +19 | (1)
ASASSN-17lx | SN 2017gqe | 2017-09-04 09:21:36 | 16.7 | 2017-09-08 09:13:32 | 0.03352 |Ia | +14 | (2)


(1) The spectrum resembles that of a post-maximum type Ia SN 1991bg-like supernova with a redshift of 0.061 from SNID.
(2) The spectrum resembles that of a post-maximum type Ia-norm SN 1995D supernova.