Asiago classification of a Ic-BL supernova and a symbiotic star
ATel #12047; L. Costantin (Univ. of Padova, Italy), A. Avramova-Bonche (Univ. of Sofia, Bulgaria), V. Pinter (Univ. of Craiova, Romania), E. Fiorellino (Univ. of Rome Tor Vergata, Italy), C. Cabello Gonzalez (Univ. Complutense de Madrid, Spain), R. Smith (QUB, Northern Ireland), S. Benetti (OAPd, Italy), M. Berton (FINCA, Finland), L. Tomasella (OAPd, Italy), V. D. Ivanov (ESO, Germany), H. Korhonen (DARK, Denmark), A. Pizzella (Univ. of Padova, Italy)
on 19 Sep 2018; 13:45 UT
Credential Certification: Marco Berton (marco.berton@unipd.it)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 12055
We report the spectroscopic classification of two optical transients discovered by the Zwicky Transient facility (ZTF; ATel #11266), AT2018gep and AT2018ggy.
The observations were performed with the 1.22m telescope of the Asiago Astrophysical Observatory, operated by the University of Padova, in the framework of the 2018 OPTICON Neon Observing School. The spectra were acquired on 2018 Sep. 17 UT 19:10, range 3300-8000 Ang, dispersion 2.31 Ang/px. The classification was done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024).
AT2018gep is matched best to the Ic-BL SN 2006aj (Pian et al. 2006, Nature, 442, 1011) three or four days before maximum light. The redshift of the source is 0.033, as derived by early spectrum (ATel #12030).
AT2018ggy is an outburst of a symbiotic star. The spectrum shows a very red continuum with narrow Balmer emissions at rest position.
