Spectroscopic Classifications of Optical Transients with the Keck I telescope
ATel #13814; M. R. Siebert, G. Dimitriadis, R. J. Foley (UCSC)
on 18 Jun 2020; 04:12 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Georgios Dimitriadis (gdimitri@ucsc.edu)
Subjects: Optical, Supernovae
We report the following classifications of optical transients from spectroscopic observations with the LRIS spectrograph on the Keck I telescope. Targets were supplied by YSE, ALERCE, ATLAS, and ZTF. All observations were obtained on 2020 Jun 17 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Name | IAU Name | RA (J2000) | Dec (J2000) | z | Type | Phase | Notes
PS20aja | AT2020fap | 15:14:14.54 | +11:11:20.64 | 0.096 | AGN | |
PS20dgn | AT2020koc | 15:59:48.52 | +27:15:38.10 | 0.166 | II | | (1)
ZTF20abcgkom | AT2020lfi | 21:01:28.98 | -00:17:07.51 | 0.055 | II | | (2)
PS20dly | AT2020lht | 12:17:15.80 | +05:12:04.08 | 0.076 | Ia | peak | (3)
ATLAS20otg | AT2020lse | 10:41:02.20 | -27:05:00.38 | 0.016 | Ia | -2d | (4)
Notes:
When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) The transient was discovered on May 20, and is still rising. Given the current luminosity of M_g ~ -20.4 mag and the long rise, the transient can be a Type II SLSN. (2) We measure an H alpha velocity of -8,200 km/s. (3) We measure an Si II 6355 velocity of -10,800 km/s. (4) We measure an Si II 6355 velocity of -11,700 km/s.
