Bin Ma and Peng Wei, National Astronomical Observatories of China; Zhaohui Shang, Tianjing Normal University; Lifan Wang, Purple Mountain Observatory; and Xiaofeng Wang, Tsinghua University, on behalf of the Chinese Antarctic Survey Collaboration, report the discovery of an apparent supernova (mag 17.0) on unfiltered CCD images taken on Jan. 18.66 UT using the 0.5-m AST3-2 telescope at Mohe, China. The new object is located at R.A. = 15h15m17s.21, Decl. = +75d29'09".5 (equinox 2000.0), which is 18".3 east and 2".9 north of the center of the galaxy 2MASX J15151575+7529066. Nothing is visible at this position on a Digitized Sky Survey image (Palomar Sky Survey cited). The discovery image has been posted at the following website URL: http://www.thca.tsinghua.edu.cn/~wangxf/AST3/PSNJ15151721+7529095.png. The variable was designated PSN J15151721+7529095 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2014M based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2014M: Jan. 12.67, [17.5 (Ma et al.); 25.77, 17.1 (Ma et al.); 28.805, 16.3 (Gianluca Masi, Francesca Nocentini, and Patrick Schmeer; remotely using a 43-cm telescope near Ceccano, Italy; position end figures 17s.15, 09".9). H.-N. Sai, W.-X. Li, and X.-F. Wang, Tsinghua University; and T.-M. Zhang, National Astronomical Observatories of China (NAOC), report on an optical spectrogram (range 350-890 nm) of PSN J15151721+7529095 = SN 2014M that was obtained on Jan. 27.90 UT with the 2.16-m telescope (+ BFOSC) at the Xinglong Station of NAOC. The spectrum is consistent with that of a type-Ia supernova a few days after maximum; cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that it matches with SN 1994ae at +9 days. The host galaxy (2MASX J15151575+7529066) seems to have a redshift of 0.0222 from the narrow emission line; adopting this redshift for the host galaxy, they measure a velocity of the Si II 635.5-nm absorption feature to be about 11500 km/s.
Central Bureau Electronic Telegrams
- Pub Date:
- January 2014