Electronic Telegram No. 1615
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2008hv AND 2008ia
     G. Folatelli and F. Forster, on behalf of the Carnegie Supernova
Project and Millennium Center for Supernova Studies collaboration, report
that they obtained spectra (range 330-930 nm) of SN 2008hv (CBET 1601,
1603, 1604) and SN 2008ia (CBET 1612) with the New Technology Telescope (+
EFOSC2) at La Silla on Dec. 10.2-10.3 UT.  The spectrum of 2008hv shows this
to be a type-Ia supernova at about one week after maximum light.  The
"Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) yields a good match to the type-Ia supernova 1994D at 9 days before
maximum.  Adopting a recession velocity of 3762 km/s for the host galaxy
(NGC 2765; Wegner et al. 2003, A.J., 126, 2268), the Si II 635.5-nm blend
appears to be blueshifted by about 11400 km/s.  The blend of the Ca II H
and K lines shows a double-minimum structure, suggesting two absorbing
components centered at 18000 and 22000 km/s.
     SN 2008ia is also a type-Ia supernova before maximum light.  The best
match from SNID is with a spectrum of SN 1994D at 3 days before maximum;
SNID also provides with an estimate of the redshift of z = 0.022.  Adopting
this redshift, the absorption minimum of the Si II 635.5-nm doublet
indicates an expansion velocity of roughly 11300 km/s.  From the absorption
minimum of the Ca II H and K blend, two components also can be identified
that appear to be blueshifted by about 18000 and 22000 km/s.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2008 CBAT
2008 December 11                 (CBET 1615)              Daniel W. E. Green