[IAUC] CBET 1132: 20071112 : SUPERNOVA 2007pl IN ESO 205-G18

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                                                  Electronic Telegram No. 1132
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 2007pl IN ESO 205-G18
     N. Morrell, Las Campanas Observatory; and G. Pignata, Universidad de
Chile, on behalf of the Carnegie Supernova Project, report that a
spectrogram (range 380-920 nm) of 2007pl (cf. CBET 1130), obtained on Nov.
11.34 UT with the du Pont 2.5-m telescope (+ WFCCD) at Las Campanas
Observatory, shows this to be a type-Ia supernova a couple of weeks after
maximum light.  Adopting the NED recession velocity of 8647 km/s for the
host galaxy (from de Vaucouleurs et al. 1991, Third Ref. Cat. of Bright
Galaxies) the 'superfit' spectrum-comparison code (Howell et al. 2005, Ap.J.
634, 1190) provides the best match to SN 1999aw at fifteen days after
maximum.  The spectrum shows evidence of absorption in the host galaxy due to
Na I D (EW about 1.5).  Considering the recession velocity given above, the
minimum absorption of the Si II 635.5-nm line indicates an expansion velocity
of about 11000 km/s.


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                         (C) Copyright 2007 CBAT
2007 November 12                 (CBET 1132)              Daniel W. E. Green