[ Previous | Next | ADS ]

Spectroscopic Classifications of 3 Optical Transients

ATel #8393; I. Shivvers, H. Yuk, W. Zheng, M. L. Graham, A. V. Filippenko
on 10 Dec 2015; 01:34 UT
Credential Certification: Isaac Shivvers (ishivvers@berkeley.edu)

Subjects: Optical, Supernovae, Transient

We report the classification of three recent optical transients based upon spectra (330-1000 nm) obtained on December 9 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory. Classifications were performed though cross-correlation with a library of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin & Tonry 2007, Ap.J. 666, 1024), and host-galaxy information was retrieved through the NASA/IPAC Extragalactic Database (NED).

 
------------------------------------------------------------------------------------------ 
Name                  | Host      | z      | Type        | Phase (d) | Discovery   | Notes 
ASASSN-15tm           | anonymous | ~0.016 | IIP         | ~max      | ATel #8365  | 1 
PSN J12265018+1615496 | II Zw 063 | 0.0455 | Ia-norm     | +30       | K. Itagaki  | 2 
PSN J11234588-0106212 | NGC 3662  | 0.0186 | Ia-91T/99aa | +20       | K. Itagaki  | 3 
------------------------------------------------------------------------------------------ 

1) The spectrum shows a strong continuum and hydrogen P-Cygni lines. SNID indicates a redshift of ~0.016 for this object; adopting that value, the absorption minima of the hydrogen features show a Doppler velocity of ~9800 km/s.
2) The spectrum cross-correlates well with spectra of multiple normal SNe Ia between +22 and +39 days.
3) SNID indicates a good match to spectra of SNe 1991T and 1999aa at +19 and +21 days, respectively.