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 (firstname.lastname@example.org)
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