Asiago spectroscopic observation of four transients

ATel #12896; L. Tomasella, S. Benetti, E. Cappellaro, M. Turatto (INAF - Osservatorio Astronomico di Padova)
on 28 Jun 2019; 13:08 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@inaf.it)

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The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of AT2019igc and AT2019ieq (supplied by Zwicky Transient Facility ZTF); AT2019ifm in UGC10839 (discovered by R.Gagliano, R.Post, E.Weinberg, J.Newton, T.Puckett) and AT2019iex in NGC7769 (discovered by D.Sand, W.Fong, K.Paterson, M.Lundquist - SAGUARO).

The observation was 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  
ZTF18adbafkf|2019igc   | galactic     |2019-06-27.189  |2019-06-27.8   | -       | CV  | -    | 1 
ZTF19abbgcbg|2019ieq   | galactic     |2019-06-27.189  |2019-06-27.9   | -       | star| -    | 2 
AT2019ifm   |2019ifm   | UGC10839     |2019-06-26.354  |2019-06-28.0   | 0.02308 | II  | ~1w  | 3 
SAGUARO19b  |2019iex   | NGC7769      |2019-06-26.457  |2019-06-28.1   | 0.014046| CC  | young| 4 

(1) The spectrum is characterized by a weak Halpha emission at rest wavelength surrounded by broad absorption troughs. The emission core in Hbeta and Hgamma absorption is only perceptible.

(2) the spectrum shows narrow absorption Balmer and metal lines at rest wavelength

(3) The spectrum is consistent with that of a Type II SN, few days after explosion. The expansion velocity of the ejecta as derived from the broad Halpha emission is about 11000 km/s, while from the Hbeta absorption of the P-Cygni profile is about 8400 km/s. The redshift z=0.02308 is derived from the narrow Halpha emission of the host galaxy, marginally consistent with z=0.024073 reported by Falco et al. 1999 PASP 111, 438 (via NED).

(4) The low S/N spectrum consists of a featureless, blue continuum. The redshift is from Huchra et al. 1999 ApJS 121, 287 (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.

The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.