Spectroscopic classification of SN 2018brz as a type Ia supernova before maximum
ATel #11655; Lluis Galbany (U. Pitt), Angel R. Lopez-Sanchez (AAO, Maquarie U.), Yago Ascasibar (UAM), Kristin Fiegert (AAO)
on 19 May 2018; 15:28 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lluis Galbany (lluisgalbany@gmail.com)
Subjects: Optical, Supernovae
We report the spectroscopic classification of SN 2018brz (RA=08:33:22.27, DEC=-76:37:39.8) in an anonymous host galaxy. The candidate was discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN: Shappee et al. 2014) on UT 2018-05-15 at ~16.5 mag.
Observations were performed on the 4m Anglo-Australian Telescope at Siding Spring Observatory on 2018 May 19 9:15 UT, using Koala+AAOmega and Grisms 580V+1000R (3500-6000A and 6300-7300A). Classification was done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024), and the spectrum is available at the IAU Transient Name Server (see https://wis-tns.weizmann.ac.il/).
The spectrum shows the typical "W" SII absorption (5454,5640A), and MgII, and FeII features characteristic of type Ia supernovae. SNID gives a reasonable fit to all its main spectral features with the pre-peak spectrum of SN 1999aa placed roughly at z ~ 0.019. Velocities measured at the bottom of both SII absorptions are consistent with -9,500 km/s.
Survey Name | IAU Name | RA (J2000) | Dec (J2000) | Disc. Date | Source | Disc Mag | z | Type | Phase | Notes
ASASSN-18kd | AT2018birz | 08:33:22.27 | -76:37:39.8 | 20180515 | ASASSN | 16.5 | 0.019 | Ia | -5 | (1)
(1) Best fit to SN1999aa. Redshift from SNID.
