Electronic Telegram No. 2184

Central Bureau for Astronomical Telegrams
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138,
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SUPERNOVA 2010ae IN ESO 162-17 G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez, P. Lopez, S. Silva, G. Folatelli, R. Cartier, F. Forster, S. Marchi, and A. Rojas, Universidad de Chile; B. Conuel, Wesleyan University; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project, report the discovery of an apparent supernova (mag approximately 15.9 +/- 0.3) on an unfiltered image taken on Feb. 22.06 UT with the 0.41-m 'PROMPT 3' telescope located at Cerro Tololo.
The new object, which is also present at mag approximately 15.6 +/- 0.3 in an image taken on Feb. 23.01, is located at R.A. = 7h15m54s.65 +/- 0".1, Decl. = -57o20'36".9 +/- 0".1 (equinox 2000.0), which is about 0".6 east and 0".2 south of the center of the galaxy ESO 162-17. Nothing is visible at this position on archival images taken on Feb. 10.11 and 17.11 (limiting mag 18.0). M. Stritzinger, Las Campanas Observatory (LCO); G. Folatelli, Universidad de Chile; G. Pignata, Universidad Andres Bello; and M. M. Phillips, LCO, on behalf of the Carnegie Supernova Project and the Millennium Center for Supernova Science, report that they obtained an optical spectrum (range 486-750 nm) of supernova 2010ae on Feb. 23.1 UT with the Gemini South telescope (+ GMOS).
This spectrum suggests that the object is a reddened (the equivalent width of Na I D is 0.12 nm), peculiar type-Ia event most similar to supernova 2006gz (Hicken et al. 2007, Ap.J. 669, 17). The spectrum consists of prevalent Si II (rest 635.5 nm) and S II (rest 544.9 and 562.3 nm) absorption features. In addition, a strong absorption feature is present at 651 nm and a weaker one at 718.1 nm, which is tentatively suggested to be formed by C II (rest 658.0 and 723.4 nm). Adopting a recession velocity of 1098 km/s (H I Parkes All-Sky Survey Final Catalog; Wong et al. 2006, MNRAS 371, 1855) for the host galaxy (ESO 162-17 is classified as a possible type-Sb-peculiar), an approximate expansion velocity of 4600 km/s was derived from the absorption minimum of the Si II line (rest 635.5 nm).
A similar measurement of the C II feature (rest 658.0 nm) yields a blue-shift of 4300 km/s. Alternatively, if the 651-nm feature was formed from H-alpha, an expansion velocity of approximately 3600 km/s is obtained.
2010 February 23
(C) Copyright 2010 CBAT
(CBET 2184 )
Daniel W. E. Green