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Asiago spectroscopic classification of 2 SNe candidates

ATel #9992; P. Ochner, A. Pastorello, S. Benetti, E. Cappellaro, N. Elias-Rosa, L. Tomasella, M. Turatto (INAF OAPd), G. Terreran (INAF OAPd, QUB)
on 24 Jan 2017; 07:29 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of SN 2017lf and SN 2017ms. The targets were supplied by the Tsinghua-NAOC Transient Survey (TNTS) and the PMO-Tsinghua Supernova Survey (PTSS).

The observations were performed with the Asiago 1.82 m Copernico Telescope equipped with AFOSC (range 340-820 nm; resolution 1.4 nm).

Survey Name |  IAU Name   | Host galaxy                 |   Redshift  |  Discovery Date | Discovery mag |  Classification  (UT) |  Type   |     Phase    | Notes   
  -         | SN 2017lf  |  NGC 1233                    |    0.0146   |   2017-01-22.59 |      17.3     |   2017-01-23.86       |   Ia    |    at max   | (1) 
PTSS-17dfc  | SN 2017ms  |  SDSS J102641.99+364053.2    |    0.0246   |   2017-01-21.71 |      16.5     |   2017-01-24.00       |   Ia    |    at max    | (2) 

(1) It exploded in the same host galaxy as SN 2009lj (SN Ic). The AFOSC spectrum is similar to that of normal Type Ia, around the B-band maximum light. However, the red continuum and the strong Na I doublet absorption at the host galaxy redshift, suggest large line-of-sight reddening. The redshift of the host galaxy comes from Theureau et al. 1997, A&AS, 130, 333. The expansion velocity deduced from the minimum of the Si II 635.5 nm absorption is about 10500 km/s. (2) The redshift of the host galaxy is provided by the Sloan Digital Sky Survey Data Release 5 as obtained Jun. 28, 2006 from http://www.sdss.org/dr5/products/catalogs/index.html. The spectrum shows that this object is a normal Type Ia around the B-band maximum light. The expansion velocity deduced from the minimum of the Si II 635.5 nm absorption is about 11700 km/s.

The classifications were 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.

Padova-Asiago SN Group