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Spectroscopic classification of ASASSN-18dn as a type Ia supernova

ATel #11347; P. Pessi (Inst. de Astrofisica, La Plata), L. Schmidtobreick (ESO), H. Boffin (ESO), M. Dennefeldt (IAP), L. Ferrero (OAC, Cordoba), J. Nascimento (UFRGS, Porto Alegre), G. Navarro (UNAB, Santiago), J. Quirola (PUC, Santiago)
on 24 Feb 2018; 08:55 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Michel Dennefeld (dennefel@iap.fr)

Subjects: Optical, Supernovae

We report the classification of the supernova candidate ASASSN-18dn, which was discovered as a g=17.9 mag transient by the All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014) on 2018-02-22.09 UT. The discovery is reported in ATel #11343 (Stone et al. 2018). Three consecutive observations of 300 sec each were performed with the ESO New Technology Telescope at La Silla, starting on 2018-02-24 at 04:38UT, using EFOSC2 and Grism 13 (3985-9315, 18A resolution) and then combined to increase the S/N. We used SNID (Blondin & Tonry, 2007) to identify the type and redshift of the SN spectra. The spectra matches the SNe Ia 2006cp at -10d and an approximate redshift of z=0.032, consistent with the suspected host galaxy 2MASX J06105892-3341177 (z=0.038) as given by NASA/IPAC Extragalactic Database (NED). Gelato (Harutyunyan et al., 2008) confirms the object as a SNe Ia similar to 2003du at -10d. These observations were performed by students of the ESO/NEON observing school taking place in La Silla right now.