[IAUC] CBET 1941: 20090915 : SUPERNOVAE 2009if AND 2009it

[IAUC mailing list]

                                                  Electronic Telegram No. 1941
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 2009if AND 2009it
     S. Benetti and F. Bufano, Istituto Nazionale di Astrofisica,
Osservatorio Astronomico di Padova; and M. Turatto, Istituto Nazionale di
Astrofisica, Osservatorio Astronomico di Catania, report that spectra of
SNe 2009if (cf. CBET 1916) and 2009it (cf. CBET 1933) were obtained with
the New Technology Telescope (+ EFOSC2; range 340-740 nm, resolution 2.2 nm).
Comparisons of the observed spectra with a library of supernova spectra was
performed with the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383,
available at https://gelato.tng.iac.es/login.cgi).  A spectrum of SN 2009it,
acquired on Sept. 15.06 UT, shows strong resemblance to those of the
underluminous type-Ia supernova 2005bl (Taubenberger et al. 2008, MNRAS 385,
75) at about three weeks after maximum light.  The spectrum of 2009if,
obtained on Sept. 15.25, shows similarities with type-Ib/c supernovae at
about two weeks after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 September 15                (CBET 1941)              Daniel W. E. Green