Spectroscopic Classification of Optical Transients with the Lick 3-m Shane Telescope
ATel #12664; Subhash Bose, Subo Dong (KIAA-PKU), T. G. Brink, W. Zheng, Thomas de Jaeger, and A. V. Filippenko (UCB)
on 16 Apr 2019; 01:06 UT
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)
Subjects: Optical, Supernovae
We report optical spectroscopic observations of optical transients ASASSN-19hp/2019clp,
ATLAS19etn/2019byw, and ATLAS19dzx/2019cbc on 2019-04-10 and 2019-03-31, using the
Kast spectrograph mounted on the 3-m Shane telescope at Lick Observatory. The targets were
discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al. 2014)
and the ATLAS survey (Tonry et al. 2011; Tonry et al. ATel #8680). We used SNID (Blondin & Tonry,
2007, ApJ, 666, 1024) to identify the supernova types and phases from the spectra.
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Survey Name | IAU Name | UT Obs. Date | Spec. Type | Phase (peak brightness) | Redshift | Notes
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ASASSN-19hp | SN 2019clp | 2019-04-10.46 | II | near maximum | 0.024184 (NED) | (1,2)
ATLAS19etn | SN 2019byw | 2019-03-31.48 | Ia | 1 week post max. | 0.030758 (NED) | (1,3)
ATLAS19dzx | SN 2019cbc | 2019-03-31.50 | II | ---- | ----- | (4)
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(1) The SNID estimated redshift is consistent with that of the host galaxy.
(2) The classification is consistent with the core-collapse SN classification reported by Ochner et al. (ATel #12621). Our spectrum was taken at a more evolved phase showing Balmer lines, allowing us to determine that it is a SN II.
(3) The spectrum strongly resembles that of a normal Type Ia supernova. This is not consistent with the earlier reported TDE classification by Ochner et al. (ATel #12621)
(4) The spectrum shows narrow P-Cygni profiles of hydrogen Balmer and He I lines on an almost featureless blue continuum, suggesting a likely Type IIn supernova. This is also consistent with the SN IIn classification (SN 1998S-like 2-3 weeks after explosion) reported earlier by Ochner et al. (ATel #12621).
