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Spectroscopic Classification of ASASSN-15tb, ASASSN-15tf, and ASASSN-15ti as SN Ia

ATel #8356; J. L. Prieto (UDP; MAS), M. Fausnaugh, K. Stanek (OSU)
on 3 Dec 2015; 15:19 UT
Credential Certification: Jose L. Prieto (jose.prietok@mail.udp.cl)

Subjects: Optical, Supernovae, Transient

We report optical spectroscopic observations of the ASAS-SN transients ASASSN-15tb (ATel #8329), ASASSN-15tf (ATel #8345), and ASASSN-15ti (ATel #8351) obtained on UT December 2-3 with OSMOS (range 4000-6850 Angstroms) mounted on the MDM 2.4m telescope. The spectra of the three objects are consistent with normal SN Ia around maximum light. We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to aid with the determination of the type/phase and the photometric redshift of ASASSN-15ti, which doesn't show host features in its the spectrum. We also measure the expansion velocity from the minimum of the Si II 6355 feature.

   
Name          | Disc. ATel | Spec. Type | Phase | Best SN template | Si II velocity (km/s) |     Redshift     | 
--------------------------------------------------------------------------------------------------------------- 
ASASSN-15tb   |    8329    |	SN Ia   |  +5d  |    SN 2007af     |      -10400           |   0.024614(host) | 
ASASSN-15tf   |    8345    |	SN Ia   |  +2d  |    SN 2004as     |       -9100           |   0.035288(host) |           
ASASSN-15ti   |    8351    |    SN Ia   |  -1d  |    SN 2003iv     |      -11200           |     0.0160(SN)   |