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).
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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
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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.
