ePESSTO spectroscopic classification of optical transients
ATel #11613; O. McBrien, P. Clark, E. Kankare, K. Maguire (QUB), M. T. Botticella (INAF-Capodimonte), M. Dennefeld (IAP, Paris), Z. Kostrzewa-Rutkowska (SRON/RU), G. Leloudas (DARK), T.-W. Chen (MPE), C. Inserra (Southampton), 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 (QUB), D. E. Wright (Univ. of Minnesota)
on 6 May 2018; 17:59 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Erkki Kankare (e.kankare@qub.ac.uk)
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 were supplied 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 ); the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680); the D<40 Mpc (DLT40) one day cadence SN search (http://dark.physics.ucdavis.edu/dlt40/DLT40); the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts); MASTER (see http://observ.pereplet.ru/ ; Lipunov et al. 2004, AN, 325, 580); and the IAU TNS list (see https://wis-tns.weizmann.ac.il/). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 May 5, 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
ASASSN-18ji | SN2018beh | 09 31 23.0 | +17 48 29.9 | 20180504 | ASAS-SN | 17.4 | 0.06 | Ib/c | young | (1)
ATLAS18nnp | SN2018bae | 14 52 49.5 | +18 04 48.7 | 20180419 | ATLAS | 19.2 | 0.07 | Ia | +8 to +10 | (2)
DLT18v | AT2018beg | 13 51 20.1 | -48 01 28.9 | 20180503 | DLT40 | 17.9 | 0.0 | stellar | - | (3)
Gaia18bcu | AT2018bel | 19 03 12.9 | -07 37 05.6 | 20180502 | Gaia | 17.7 | 0.0 | stellar | - | (3)
MASTERJ150803.15-270155.0 | - | 15 08 03.2 | -27 01 54.9 | 20180318 | MASTER | 17.1 | 0.179 | AGN | - | (4)
Gaia18bby | SN2018bdm | 18 28 02.0 | +16 07 40.6 | 20180427 | Gaia | 18.8 | 0.034 | Ia-pec | > +20 | (5)
Gaia18bbs | AT2018bdi | 20 23 26.5 | +06 40 00.8 | 20180426 | Gaia | 17.3 | - | ? | - | (6)
| AT2018bbv | 15 55 48.8 | -68 52 14.4 | 20180425 | BOSS | 17.1 | - | ? | - | (7)
Gaia18bcs | AT2018bee | 17 30 58.7 | +12 44 20.9 | 20180430 | Gaia | 18.2 | 0.0 | stellar | - | (3)
ASASSN-18jd | AT2018bcb | 22 43 42.9 | -16 59 08.1 | 20180427 | ASAS-SN | 17.5 | 0.120 | AGN | - | (8)
Gaia18bbo | SN2018bde | 23:14:33.3 | -24 56 14.6 | 20180428 | Gaia | 17.6 | 0.048 | Ia | -3 to +3 | (2)
(1) Young stripped-envelope SN. ASASSN-18ji was observed as part of the GREAT survey (Chen et al. ATel #10510), having a black body temperature of T_BB ~ 12600 +/-1000 K obtained from the photometry taken on 2018-05-04 with griz = 17.19, 17.38, 17.47, 17.6 mag. The coordinate from GROND r-band image at RA 09:31:23.042, Dec +17:48:27.90.
(2) Normal Type Ia.
(3) Blue continuum with weak absorption features consistent with Balmer series at z = 0.
(4) Blue continuum with a break at 4000 A in rest frame. Both broad and narrow Halpha and Hbeta emission components and narrow [O III] emission lines.
(5) SN2002cx-like Type Ia.
(6) Blue noisy featureless continuum.
(7) Noisy featureless continuum.
(8) Nuclear transient. Blue continuum with Balmer emission lines and possibly a broad HeII 4686 A feature. Halpha FWHM ~ 2500 km/s. Possibly an AGN, however a TDE or a circum-nuclear Type II SN are not excluded.