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Asiago spectroscopic classification of 4 transients

ATel #9809; P. Ochner, A. Pastorello, N. Elias-Rosa, S. Benetti, E. Cappellaro, L. Tomasella, M. Turatto (INAF OAPd), G. Terreran (INAF OAPd, QUB)
on 30 Nov 2016; 09:13 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae, Transient

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of four transients. The targets were supplied by the the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts), the Pan-STARRS Survey for Transients (Huber et al. 2015, ATel #7153), and the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680).

The observations were performed with the Asiago 1.82 m Copernico Telescope equipped with AFOSC (range 340-820 nm; resolution 1.4 nm) and with the Asiago 1.22 m Galilei Telescope equipped with a B&C spectrograph (range 330-790 nm; 0.7 nm).

 
Survey Name |  IAU Name   |         Host galaxy          |   Redshift  |  Discovery (UT) | Discovery mag |  Classification  (UT) |  Type   |      Phase        | Notes  
Gaia16byl   | SN 2016iou  | GALEXASC J012426.41-020830.1 |    0.042    |   2016-11-26.16 |      17.39    |   2016-11-29.93       |   Ia    |    after max      | (1) 
PS16fhg     | AT 2016ion  |                              |    0        |   2016-11-26.50 |      14.8     |   2016-11-29.99       |   CV    |                   | (2) 
ATLAS16dye  | SN 2016inv  | 2MASX J07564703+3749063      |    0.043586 |   2016-11-26.50 |      17.78    |   2016-11-30.00       |   Ia    |  slightly pre-max | (3)  
ATLAS16dyo  | SN 2016ipf  | SDSS J080713.50+054056.5     |    0.021    |   2016-11-28.62 |      17.55    |   2016-11-30.04       |   Ia    |    pre max        | (4) 

(1) The AFOSC spectrum is similar to that of normal Type Ia supernovae about one week after the B-band maximum light. The expansion velocity deduced from the minimum of the Si II 635.5 nm absorption is about 10900 km/s. The redshift of the host galaxy is deduced from the wavelength of the main SN features.

(2) The blue B&C spectrum is almost featureless, with a narrow, unresolved Halpha in emission at z = 0. Hbeta and Hgamma loom as absorption with an emission core.

(3) The AFOSC spectrum is similar to that of a normal Type Ia supernovae few days before the maximum light. The redshift of the likely host galaxy is provided by the Sloan Digital Sky Survey Data Release 2 as obtained Nov. 18, 2004 from http://www.sdss.org/dr2/products/spectra/getspectra.html.The expansion velocity deduced from the minimum of the Si II 635.5 nm absorption is about 11500 km/s.

(4) The AFOSC spectrum is similar to that of normal Type Ia supernovae about one week before the B-band maximum light. The expansion velocity deduced from the minimum of the Si II 635.5 nm absorption is about 11800 km/s. The redshift of the host galaxy is deduced from the wavelength of the main SN features.

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