ePESSTO+ spectroscopic classification of optical transients
ATel #12828; C. Frohmaier, E. Swann (ICG; Portsmouth), P. Short, M. Nicholl (Edinburgh), H. Kuncarayakti (Turku), M. Gromadzki (Warsaw), L. Galbany (Pittsburgh), J. Anderson (ESO), T. Muller Bravo (Southampton), T.-W. Chen (MPE), C. Inserra (Cardiff), E. Kankare (Turku), O. Yaron (Weizmann), D. R. Young (QUB), I. Manulis (Weizmann), J. Tonry, L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), K. W. Smith, S. J. Smartt, O. McBrien, S. Srivastav (QUB)
on 1 Jun 2019; 14:03 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Matt Nicholl (mrn@roe.ac.uk)
Subjects: Optical, Supernovae, Transient
ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ), reports the following supernova classifications.
Targets were supplied by the Zwicky Transient Facility (https://www.ztf.caltech.edu/; Kulkarni et al. 2018, ATel 11266) data stream processed through the Lasair broker (http://lasair.roe.ac.uk/), by the ATLAS survey, see Tonry et al. (2018, PASP, 130, 064505) and by the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014, ApJ, 788, 48 and http://www.astronomy.ohio-state.edu/~assassin/index.shtml ).
All observations were performed on the ESO New Technology Telescope at La Silla on 2019 May 31, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and DASH (Muthukrishna et al. 2019, arXiv:1903.02557). Classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.
Survey Name | IAU Name | RA (J2000) | Dec (J2000) | Disc. Date | Source | Disc Mag | z | Type | Phase | Notes
ASASSN-19nn | SN2019fzm | 14:56:32.86 | -02:06:23.7 | 20190527 | ASAS-SN | 17.2 | 0.023 | Ia | -7 to -4 |
ATLAS19llw | AT2019fzu | 19:48:31.00 | -11:46:01.1 | 20190525 | ATLAS | 16.3 | | CV | | (1)
ZTF19aavigow | AT2019fyr | 18:02:27.87 | +08:06:34.4 | 20190524 | ZTF | 19.7 | | Unknown| | (2)
ATLAS19lsc | SN2019gaf | 20:36:55.24 | +02:48:24.4 | 20190527 | ATLAS | 18.6 | 0.006 | IIb | pre-max | (3)
ASASSN-19nv | SN2019gfb | 23:47:25.84 | +00:56:58.4 | 20190530 | ASAS-SN | 17.2 | 0.027 | Ia | -7 to -4 |
ATLAS19ljs | SN2019fxt | 20:18:48.55 | +05:30:46.0 | 20190523 | ATLAS | 18.6 | 0.067 | Ia | at max |
(1) Spectrum shows a blue continuum with narrow emission lines of H and He at z=0.0
(2) Low S/N spectrum. The ZTF light curve rises by almost 3 mags in 1 day. The spectral continuum is relatively red despite a blue colour g-r~ -2 at discovery. There is also a possible point source at this position in PanSTARRS. This transient is therefore most likely a stellar flare. However we do note a possible broad feature at ~4800 A.
(3) Spectrum shows a blue continuum with broad P Cygni lines including H-alpha with a boxy profile. SNID gives a best match to SN2003bg at -7 days. DASH, which has younger templates, favours a classification of SN IIb at -14 to -6 days.
