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Spectroscopic classification of PSN J11430127+2357016 in UGC 6681 and PSN J16412717+5747050 in NGC 6211

ATel #5105; S. Srivastav (Indian Institute of Astrophysics), N. K. Chakradhari (Pt. Ravi Shankar Shukla Univ.), D. K. Sahu, G. C. Anupama (Indian Institute of Astrophysics)
on 5 Jun 2013; 14:50 UT
Credential Certification: G.C. Anupama (gca@iiap.res.in)

Subjects: Optical, Supernovae

We report the classification of PSN J11430127+2357016 in UGC 6681 and PSN J16412717+5747050 in NGC 6211 based on low resolution spectrum obtained using the 2m Himalayan Chandra Telescope (+HFOSC) at the Indian Astronomical Observatory. A spectrum of PSN J11430127+2357016 obtained in the wavelength range 390-920 nm on May 31.75 UT exhibits hydrogen Balmer lines, indicating that it is a type II supernova. The SuperNova IDentification code SNID (Blondin & Tonry 2007, ApJ, 666, 1024) gives a best match with the type IIb supernova SN2000H at about two weeks after explosion. Correcting for the recession velocity of the host (6819 km/sec; Haynes et al 1997, AJ, 113, 1197), the expansion velocity measured with the minimum of P Cygni absorption of H-alpha is ~ 12,900 km/sec. A spectrum of PSN J16412717+5747050 obtained in the wavelength range 360-780nm on June 4.81 UT exhibits a blue continuum and a prominent Si II 635.5 nm absorption trough, and well developed SiII 597.2 nm line, identifying it as a Type Ia event. SNID provides a best match for the observed spectrum with the normal type Ia supernova SN1992A close to maximum. Adopting a recession velocity of 5273 km/sec for the host (Wegner et al. 2003, AJ, 126, 2268), the expansion velocity deduced from the Si II 635.5 nm absorption feature is ~ 12,400 km/sec.