Spectroscopic classification of ASASSN-16ip and ASASSN-16io supernovae with the Nordic Optical Telescope

ATel #9368; C. Gall (Aarhus U), S. Mattila (Turku), N. Elias-Rosa (INAF-Padova), P. Lundqvist (Stockholm), M. Stritzinger (Aarhus U), H. Kuncarayakti (MAS, DAS), A. Pastorello (INAF-Padova), S. Benetti (INAF-Padova), E. Cappellaro (INAF-Padova), N. Blagorodnova (Caltech), S. Davis (FSU), S. Dong (KIAA-PKU), M. Fraser (IoA), J. Harmanen (Turku), 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 (MAS/UDP), T. Reynolds (Turku, NOT), C. Romero-Canizales (MAS/UDP), F. Taddia (OKC), L. Tartaglia (INAF-Padova), G. Terreran (INAF-Padova/QUB), L. Tomasella (INAF-Padova), L. Wyrzykowski (Warsaw Observatory)
on 11 Aug 2016; 14:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Christa Gall (cgall@phys.au.dk)

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The NOT Unbiased Transient Survey (NUTS; ATel #8992) collaboration reports the spectroscopic classifications of supernovae ASASSN-16io and ASASSN-16ip in the galaxy 2MASX J18400114+5413042 and the galaxy ESO 479-G007, respectively. The candidates were discovered by the All Sky Automated Survey for SuperNovae (ASAS-SN, ATel #9349 and ATel #9353)

The observations were performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC on 2016-08-10 UT and 2016-08-11 UT (range 350-950 nm; resolution 1.62 nm).

 
Name         | IAU Name     | Host galaxy             | Redshift | Discovery (UT) | Discovery mag | Type | Phase                     | Notes 
 
ASASSN-16io  | SN 2016esx   | 2MASX J18400114+5413042 | 0.037    | 2016-08-08.43   | 17.0         |  Ia  | a few days after maximum  | (1) 
ASASSN-16ip  | SN 2016euj   | ESO 479-G007            | 0.017    | 2016-08-09.210  | 16.3         |  Ia  | a few days before maximum | (2) 

(1) A good match is obtained with Type Ia SN 2002er about a week after maximum. The redshift is obtained from SNID. The object has also already been classified as SN Type Ia in ATel #9367. (2) A good match is obtained with Type Ia SN 1992A a few days prior to maximum. The redshift is obtained from the NED (ATel #9353).

Classifications were performed using the SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools.