[IAUC] CBET 2473: 20101002 : SUPERNOVAE 2010hz, 2010ic, AND 2010id

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2473
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


SUPERNOVAE 2010hz, 2010ic, AND 2010id
     J. M. Silverman, S. B. Cenko, J. Choi, and A. V. Filippenko, University
of California, Berkeley, report that inspection of CCD spectra (range 340-980
nm), obtained on Oct. 1 UT with the 3-m Shane reflector (+ Kast) at Lick
Observatory, shows that 2010hz (CBET 2462) is a type-Ia supernova; after
removal of the host-galaxy recession velocity of 7300 km/s, determined from
narrow emission features, the absorption minimum of the Si II 635.5-nm line
is found to be blueshifted by about 11400 km/s.  Cross-correlation with a
library of supernova spectra using the "SuperNova IDentification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2010hz is about one
week past maximum brightness.  SN 2010ic (CBET 2465) is a type-II supernova
with well-developed Balmer lines having P-Cyg profiles; after removal of the
host-galaxy recession velocity of 4600 km/s, determined from narrow emission
features, the absorption minimum of the H-alpha line is found to be
blueshifted by about 9900 km/s.  Silverman et al. also confirm the findings
of Kasliwal et al. (http://www.astronomerstelegram.org/?read=2862) that SN
2010id (CBET 2467), referred to by Kasliwal et al. as PTF10vdl, is a type-II
supernova at the same redshift as its host galaxy, NGC 7483.  The emission
component of the H-alpha line substantially dominates over the absorption
component.


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                         (C) Copyright 2010 CBAT
2010 October 2                   (CBET 2473)              Daniel W. E. Green