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 |
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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) |
