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: ATLAS
The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of AT2019bea, AT2019bmj, AT2019bas and AT2019blp. The targets were supplied by ZTF and ATLAS surveys.
The observations were performed with the Asiago 1.82m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).
Survey name | IAU name | Host galaxy | Disc. Date (UT) | Obs. Date (UT) | redshift | type | phase | notes ATLAS19dlo | SN2019bea | SDSS J102208.88-023244.2 | 2019-02-26 10:45:07 | 2019-03-05 22:06:23 | 0.068 | Ia | -5d | (1) ATLAS19dsm | SN2019bmj | SDSS J144110.10+390421.1 | 2019-03-04 14:51:21 | 2019-03-05 03:07:30 | 0.0538 | blue continuum | - | (2) ZTF19aakpcfy | SN2019bas | SDSS J162651.99+292314.1 | 2019-02-24 12:02:36 | 2019-03-06 04:06:46 | 0.078316 | Ia | at max | (3) ZTF19aalryov | SN2019blp | SDSS J163425.34+113648.9 | 2019-03-01 11:29:45 | 2019-03-06 04:37:37 | 0.050085 | Ia | +3d | (4)
(1) Spectrum similar to several type Ia SNe, few days before maximum light. The redshift z=0.068 for the host galaxy is derived from SNID/GELATO SN template fitting (photoZ ~0.11 is reported in SDSS DR15). Using the SNID/GELATO redshift, an expansion velocity of about 10500 km/s is derived from the SiII 635.5 nm minimum.
(2) The Asiago spectrum shows a blue, featureless continuum, from which we derived a black-body temperature of about 14800 K. The redshift is deduced from the position of the narrow emission lines of the host galaxy.
(3) Spectrum similar to normal type Ia SNe, around maximum light. The redshift of the host galaxy is reported in SDSS DR4, 2005 (via NED). Using this redshift, an expansion velocity of about 12000 km/s is derived from the SiII 635.5 nm minimum.
(4) Spectrum similar to normal type Ia SNe, few days after maximum light. The redshift of the host galaxy is reported by Almeida et al. 2011, ApJ 735, 125 (via NED). Using this redshift, an expansion velocity of about 10200 km/s is derived from the SiII 635.5 nm minimum.