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Asiago spectroscopic classification of ASASSN-18fw and ASASSN-18ga

ATel #11466; P. Ochner, S. Benetti, L. Tomasella, E. Cappellaro, M. Turatto (INAF-OAPd) and K. Z. Stanek (Ohio State)
on 23 Mar 2018; 00:08 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of ASASSN-18fw and ASASSN-18ga, discovered during the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014).

The observations were performed with the Asiago 1.82 m Copernico Telescope equipped with AFOSC (range 320-728 nm; resolution 1.4 nm).

 
 
Survey Name   | IAI Name      | Discovery date (UT)  | Discovery mag    | Observation (UT)    |  Type  | z         | Notes| 
ASASSN-18fw   | SN2018aki     |  2018-02-21.49       | 17.3             |2018–02-22 19:21:00  |   Ia   | 0.030211  | (1)  | 
ASASSN-18ga   | SN2018aks     |  2018-02-22.49       | 17.9             |2018-02-22 21:02:00  |   Ic   | 0.060     | (2)  | 

(1) The noisy spectrum of ASASSN-18fw is consistent with those of Type Ia SN 2003kf about one week before maximum light. The velocity of the ejecta, as measured from SiII 635.5 nm, is around 12500 km/s.

(2) Noisy spectrum which shows fair matches with normal Type Ic SNe around maximum light. The redshift has been deduced with SNID.

Classifications were done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024). The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.