Asiago spectroscopic observations of ASASSN-18ie and SNhunt368

ATel #11552; S. Chen, Y. Cai, E. Congiu, A. Reguitti (Padova University), A. Pastorello (INAF-OAPd)
on 20 Apr 2018; 13:48 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Andrea Pastorello (andrea.pastorello@oapd.inaf.it)

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In the framework of the Asiago Transient Classification Program (see, e.g., Tomasella et al. 2014, AN, 335, 841), we report the spectroscopic classification of SNhunt368, and attempted the spectroscopic classification of ASASSN-18ie in VIII Zw 260W. The candidates were discovered by M. Villi and Catalina Real-Time Transient Survey (Drake et al. 2009, ApJ, 696, 870; http://crts.caltech.edu/ ), and the All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014).
The spectra have been obtained with the 1.82m Copernico Telescope of Asiago equipped with AFOSC (gr. VPH7, range 330-730 nm; resolution 1.5 nm).

 
Survey Name    | IAU Name   | Discovery (UT) | Discovery mag | Observation (UT) | Redshift | Type   | Phase    | Notes  
ASASSN-18ie    | AT 2018avh | 2018-04-16.26  | 17.4          | 2018-04-19.88	| 0.0458   | galaxy |   -      | (1) 
SNhunt368      | SN 2018ata | 2018-04-10.27  | 20.1          | 2018-04-20.03    | 0.19     | Ia     | at max   | (2)  
(1) The spectrum of the host galaxy core is very similar to that of SDSS DR14, and does not reveal any SN-like feature.  
(2) The spectrum resembles that of a normal Type Ia SN at about the B-band maximum light. The redshift is estimated through the broad SN features. Although SNhunt368 is projected  
near NGC 4614 (z=0.016), the SN is associated to a much more distant foreground galaxy.   
 
We also targeted  AT 2018atp, discovered by Xu et al. in the host galaxy IC 800 (z=0.00776). No source was visible in the acquisition images down to r = 20 mag. 
  
 
The classifications made use of the GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools. Calibrated spectra and additional  
information can be retrieved from the IAU Transient Name Server.