[IAUC] CBET 1189: 20071231 : SUPERNOVA 2007ux

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                                                  Electronic Telegram No. 1189
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2007ux
     R. Chornock, X. Wang, and A. V. Filippenko, University of California,
Berkeley, report that inspection of CCD spectra (range 330-1050 nm) obtained
on 2007 Dec. 31.4 UT using the Kast spectrograph on the Shane 3-m telescope
at Lick Observatory, reveals that 2007ux (CBET 1187) is a supernova of type
Ia, with a spectral-feature age of about 4 days before maximum light.  The
apparent host galaxy lacks redshift information, but the nearby galaxy UGC
5477 (2' away) has a catalogued recession velocity of 9212 km/s (Tonry and
Davis 1981, Ap.J. 246, 666); if this value is assumed to also apply to the
true host galaxy, then the apparent expansion velocity of the Si II 635.5-nm
feature is -10000 km/s, suggesting that the host galaxy is at a similar or
higher redshift than UGC 5477.  The Si II 597.2-nm absorption is unusually
strong, relative to Si II 635.5-nm absorption, suggesting that the object
may be somewhat subluminous, though obvious Ti II lines are not present.


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                         (C) Copyright 2007 CBAT
2007 December 31                 (CBET 1189)              Daniel W. E. Green