Asiago spectroscopic classification of 3 supernovae
ATel #9829; M. Turatto, S. Benetti, L. Tomasella, E. Cappellaro, N. Elias-Rosa, P. Ochner (INAF OAPd), G. Terreran (INAF OAPd, QUB)
on 6 Dec 2016; 10:15 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lina Tomasella (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of ATLAS16dys (SN 2016ijj), ASASSN-16oj (SN 2016ips) and ASASSN-16ns (SN 2016iog).
The targets were supplied by the ATLAS survey (Tonry et al. 2011, PASP, 123, 58), and by the ongoing
All Sky Automated Survey for SuperNovae (ASAS-SN), Atel #9812 and #9825.
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
ATLAS16dys | SN 2016ijj | UGC 01393 | 0.041 | 2016-11-29 | 17.39 | 2016-12-05.95 | Ia | at max | (1)
ASASSN-16oj | SN 2016ips | SDSS J053208.29-020407.9 | 0.025 | 2016-12-05 | 17 | 2016-12-06.00 | Ia | ~1 week | (2)
ASASSN-16ns | SN 2016iog | GALEXASC J100418.99+432525.7| 0.038 | 2016-11.29 | 17.2 | 2016-12-06.05 | II | young | (3)
(1) Same host of SN 2003iu (SN Ia). Already classified as a Type Ia SN in Atel #9816.
The AFOSC spectrum confirms this object is a normal Type Ia around the B-band maximum light, the best match being with SN 1994D.
The redshift of the host galaxy, z=0.041095, comes from De Vaucouleurs eta l. 1991 (RC3.9, via NED).
Using this redshift, the expansion velocity deduced from the minimum of the Si II 635.5 nm absorption is about 11100 km/s.
(2) The host galaxy has a photoZ=0.02, from SDSS DR13. The spectrum shows this object is a normal Type Ia around 1 week after the B-band maximum light.
The expansion velocity deduced from the minimum of the Si II 635.5 nm absorption is about 9700 km/s.
(3) The AFOSC spectrum shows a blue almost featureless continuum, typically seen in young core collapse SNe (especially IIb SNe) a few days after explosion. From the few shallow features seen in the spectrum,
a tentative redshift of ~0.038 is derived.
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