ePESSTO spectroscopic classification of optical transients
ATel #12300; M. Pursiainen, N. Castro-Segura, M. Smith (Southampton), M. Dennefeld (IAP, Paris), M. Gromadzki (Warsaw University Astronomical Observatory), C. Inserra (Cardiff), E. Kankare, K. Maguire, S. J. Smartt (QUB), 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, O. McBrien (QUB), D. E. Wright (Univ. of Minnesota)
on 15 Dec 2018; 19:09 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Mathew Smith (matsmith2@gmail.com)
Subjects: Optical, Supernovae
ePESSTO, the extended 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 are from the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts), the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680), and 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/). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 Dec 14, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). 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
Gaia18dsj | SN2018jnj | 23 56 17.35 | -25 18 21.5 | 20181205 | Gaia | 18.47 | 0.098 | SNIa | +11 to +20 |
ATLAS18bbgi | SN2018jpr | 11 30 43.04 | -06 07 37.4 | 20181206 | ATLAS | 18.14 | 0.072 | SNIa | +8 to +10 |
ZTF18abvdlzi | | 00 27 16.78 | -21 12 26.4 | 20181106 | ZTF | 19.70 | 0.162 | AGN | | a
ATLAS18unu | SN2018ibb | 04 38 56.95 | -20 39 44.0 | 20180906 | ATLAS | 18.99 | 0.16 | SLSN-I | around max | b
a. Slowly rising light-curve, with absolute magnitude -20.4. Broad Halpha emission is contaminated by telluric absorption. Spectrum exhibits AGN features in the blue, and while there are some viable matches to SNII, the similarity between the ePESSTO spectrum and a legacy 6dF spectrum indicates that this source is an AGN.
b. Spectrum of slowly evolving object classified by ZTF as a SN of ambiguous type at z=0.1586. The best-fit matches to the ePESSTO spectrum are to that of SLSN-I (in particular PTF12dam) at z=0.16 just after maximum light. Given the 100+ day rest-frame rise time of this this object, further observations are encouraged.
