[IAUC] CBET 1953: 20090929 : SUPERNOVAE 2009in, 2009iu, 2009iw, 2009jd, 2009je

[IAUC mailing list]

                                                  Electronic Telegram No. 1953
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2009in, 2009iu, 2009iw, 2009jd, 2009je
     N. Morrell and M. Phillips, on behalf of the Canegie Supernova Project,
write that they obtained optical spectroscopy (range 362-944 nm) of 2009in
(cf. CBET 1926), 2009iu (cf. CBET 1937), 2009iw (cf. CBET 1942), 2009jd (cf.
CBET 1950), and 2009je (cf. CBET 1951) on Sept. 27.04-27.37 UT with the 6.5-m
Magellan II Clay telescope (+ LDSS3) at Las Campanas Observatory.  Inspection
of the data reveals that 2009in is an evolved type-Ia supernova; cross-
correlation with a library of supernova spectra via the Supernova
Identification tool (SNID; Blondin and Tonry, 2007, Ap.J. 666, 1024)
indicates that 2009in is most similar to supernovae 2002ic and 2005hk at
about 7 weeks past maximum brightness, supporting its classification as
peculiar type Ia.  SN 2009iu is a type-Ib supernova; SNID finds good agreement
with the spectra of several normal type-Ib events from 1 to 2 weeks past
maximum light, with a best match to SN 1999dn at 7 days past maximum.  The
spectrum of 2009iw is that of a type-Ia supernova near maximum light; SNID
provides very good comparisons with spectra of normal type-Ia supernovae
between 7 days before and 3 days after maximum brightness.  Assuming for the
host galaxy (IC 2160) the NED recession velocity of 4739 km/s (Wong et al.
2006, H I Parkes All Sky Survey Final Catalogue), the minimum of the Si II
635.5-nm line is blueshifted by 10300 km/s.  Inspection of the spectrum of
2009jd reveals it to be a type-II supernova, roughly 1 month after explosion;
from the H-alpha emission line in the spectrum of the nearest galaxy (2MASXi
J0029552-043511) a recession velocity of 7546 km/s is derived.  Considering
that redshift, the minimum of the P-Cyg absorptions of H-beta and H-alpha in
the SN 2009jd spectrum are blueshifted by 3600 km/s and 5600 km/s,
respectively.  The spectrum of 2009je is that of a type-Ic supernova,
probably a few weeks after maximum light, although it might be younger
according to some of the matches produced by SNID (e.g., 1997dq at 1 day
before maximum).


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

                         (C) Copyright 2009 CBAT
2009 September 29                (CBET 1953)              Daniel W. E. Green