[IAUC] CBET 2476: 20101002 : SUPERNOVA 2010hy
quai en eps.harvard.edu
quai en eps.harvard.edu
Mie Sep 14 16:19:43 ART 2011
Electronic Telegram No. 2476
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
e-mail: cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network
SUPERNOVA 2010hy
J. Vinko, University of Szeged; J. C. Wheeler and E. Chatzopoulos,
University of Texas; and G. H. Marion, Harvard-Smithsonian Center for
Astrophysics and University of Texas, report that a spectrogram, obtained on
Sept. 30.15 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-
Resolution Spectrograph) by J. Caldwell, confirms the previous finding by
Cenko et al. (CBET 2461) that 2010hy is a type-Ic supernova. SNID (Blondin
and Tonry 2007, Ap.J. 666, 1024) indicates that the spectrum of 2010hy is
most similar to those of SN 2004aw within a few days of maximum light. The
features of Mg II at 448.1 nm, the Fe II "W" feature around 500 nm, and Si II
635.5-nm can be unambigously identified. O I at 777.4 nm and the Ca II near-
infrared triplet may be present but heavily contaminated by telluric lines
and buried by noise. The average redshift from these supernova features is
z = 0.19. Because SN 2010hy presumably brightened since its discovery before
maximum (Sept. 4 at unfiltered CCD mag 19.1), this redshift value indicates a
peak absolute magnitude brighter than -20.4. SN 2010hy is very probably an
overluminous event, similar to SN 2007bi, which was suggested as a possible
pair-instability supernova explosion (Gal-Yam et al. 2009, Nature 462, 624).
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2010 CBAT
2010 October 2 (CBET 2476) Daniel W. E. Green
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