[IAUC] CBET 2025: 20091117 : SUPERNOVAE 2009le AND 2009lf

[IAUC mailing list]

                                                  Electronic Telegram No. 2025
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 2009le AND 2009lf
     P. Challis, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf
of the CfA Supernova Group reports that a spectrum (range 360-750 nm) of
2009le (cf. CBET 2022), obtained on Nov. 16 UT by P. Berlind with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a normal type-Ia
supernova.  Cross-correlation with a library of supernova spectra using the
"Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2009le matches a normal type-Ia supernova at a phase of
about ten days before maximum; the minimum of the Si 635.5-nm line is blue-
shifted by 19000 km/s.  There is essentially no Milky Way extinction, and
there is no strong Na D in the spectrum from the host galaxy (ESO 478-6).
A spectrogram of 2009lf (cf. CBET 2023), obtained as above by Berlind, also
shows it to be a type-Ia supernova; cross-correlation with SNID indicates
that 2009lf matches the type-Ia supernova 1992A at a phase of three days
after maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 November 17                 (CBET 2025)              Daniel W. E. Green