The program started in 2011 with the aim to classify all transients that are accessible from Asiago and are bright enough for our telescope/instrumentation. We use mainly the 1.82m Copernico telescope of Cima Ekar and, if not available, the 1.22m Galileo telescope of the Pennar station. A few cases of transients classified by our group with other facilities (eg. TNG) are included in the database.
Transient classification information and spectra (fits format) are made immediately available at our site. The spectra are semi-automatic reduction with archive calibration data. Please keep this in mind when using them.
For SN classification we compare the output of two automatic SN classification codes: Gelato (Harutyunyan et al. 2008, A&A 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).
If you use some of the information posted in these pages please make a reference to the paper Tomasella etal. 2014, A.N. 335, 841.
Discovered by: ASASSN
The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of ZTF20abzgddp (AT 2020tjb) and ASASSN-20ko (SN 2020rvf).
The targets were supplied by the Zwicky Transient Facility (https://www.ztf.caltech.edu/; Kulkarni et al. 2018, ATel #11266), and by the All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014) and reported in the Transient Name Server (TNS).
The observations were obtained with the Asiago 1.82m Copernico Telescope (+ AFOSC grism#4; range 340-820 nm; resolution 1.4 nm).
Survey name | IAU name | Host galaxy | Disc. Date (UT) | Obs. Date (UT) | redshift | type | phase | notes ZTF20abzgddp | AT2020tjb |h hostless | 2020-09-15 04:00:28.80 | 2020-09-17 23:19:53.8| 0 | CV |-| 1 ASASSN-20ko | SN 2020rvf | CGCG 465-012 | 2020-08-22 02:52:48.00 | 2020-09-18 00:17:24.3 | 0.022222 |I Ic | 20-30d | 2
(1) The spectrum shows a blue continuum with higher Balmer lines in pure absorption, while Halpha is filled by its emission component and Hbeta shows a weak emission core surrounding broad absorption troughs. These features are typically seen in CVs soon after the outburst.
(2) The spectrum shows a red continuum and a very intense interstellar NaID (EW~0.72 nm) suggesting a high reddening (E(B-V)~1.2 mag, following Turatto, et al. 2003, fthp.conf, 200). The spectrum is contaminated by the host galaxy nuclear emission making it difficult to decide whether the narrow Halpha is indeed intrinsic to the SN. Assuming the high reddening, GELATO returns a good fit with the type Ic SN 1990aa spectrum 2-3 weeks after maximum but also with the peculiar SN 2002ic. The redshift is from RC3, via NED.
The classification was performed using the GELATO (Harutyunyan et
al. 2008, A&A, 488, 383)
and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools.