Spectroscopic classification of ASASSN-16ex with the Nordic Optical Telescope

ATel #9024; L. Tomasella (INAF-Padova), N. Elias-Rosa (INAF-Padova), A. Pastorello (INAF-Padova), S. Benetti (INAF-Padova), E. Cappellaro (INAF-Padova), S. S. Mattila (Turku), P. Lundqvist (Stockholm), M. Stritzinger (Aarhus U), H. Kuncarayakti (MAS, DAS), J. Harmanen (Turku), N. Blagorodnova (Caltech), S. Davis (FSU), S. Dong (KIAA-PKU), M. Fraser (IoA), C. Gall (Aarhus U), D. Harrison (IoA), S. Hodgkin (IoA), E. Y. Hsiao (FSU), P. Jonker (SRON), T. Kangas (Turku), E. Kankare (QUB), Z. Kostrzewa-Rutkowska (Warsaw/SRON), M. Nielsen (Aarhus U), Paolo Ochner (INAF-Padova), J. L. Prieto (UDP, MAS), T. Reynolds (Turku, NOT), C. Romero-Canizales (PUC, MAS), F. Taddia (OKC), L. Tartaglia (INAF-Padova), G. Terreran (INAF-Padova/QUB), L. Wyrzykowski (Warsaw Observatory)
on 5 May 2016; 16:44 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

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The NOT Unbiased Transient Survey (NUTS; ATel #8992) collaboration reports the spectroscopic classifications of ASASSN-16ex (AT 2016ccj) in SDSS J171023.63+262350.3. The candidate were discovered by the All Sky Automated Survey for SuperNovae (ASAS-SN, ATel#9020).

The observation was performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC (range 320-910 nm; resolution 1.4 nm) on 2016-05-04.63 UT.

 
Name                     |  host galaxy           |   redshift   |  Discovery (UT) |  Discovery mag |  Type    | Phase      | Notes 
ASASSN-16ex              |SDSS J171023.63+262350.3|    0.03      |  2016-04-30.43  |   17.5         |   Ia-pec | ~-10d      | (1) 

(1) Best match with the peculiar Type Ia SN 2009dc (a super-Chandrasekhar-mass SNe Ia; Taubenberger et al. 2011, MNRAS 412, 2735) about 10 days before B-band maximum light. A good match is also found with SN 2006gz, 10-12 days before maximum, see also Atel#9023.. The prominent C II lines which occasionally characterise super-Chandrasekhar-mass SNe Ia are also detected at 658.0 nm and 723.4 nm The redshift z=0.032 deduced from the match with SN 2009dc is in agreement with the photometric redshift provided by the Sloan Digital Sky Survey Data Release 10 (photoZ=0.031). From the position of the minimum of the Si II 635nm feature, we infer an expansion velocity of 10100 km/s for the ejected material.

Classifications were performed using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools, and are posted on WISeREP (Yaron & Gal-Yam 2012, PASP, 124, 668).