Central Bureau for Astronomical Telegrams
IAUC 8639: 2005kz, 2005la
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Circular No. 8639
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVAE 2005kz AND 2005la
Two supernova discoveries have been reported from unfiltered
CCD frames: 2005kz by T. Puckett and G. Sostero (via the 0.60-m
automated supernova patrol telescope in Ellijay, GA; cf. IAUC 8635),
and 2005la by R. Quimby and P. Mondol (via the 0.45-m ROTSE-IIIb
telescope at the McDonald Observatory; cf. IAUC 8622).
SN 2005 UT R.A. (2000.0) Decl. Mag. Offset
2005kz Dec. 1.03 19 00 49.82 +50 53 01.8 18.7 15".6 E, 9".5 N
2005la Nov. 30.51 12 52 15.68 +27 31 52.5 17.6 6" W, 6" S
Additional approximate magnitudes for 2005kz in MCG +08-34-32: Nov.
1, [20.0; Dec. 1.99 UT, 18.2. Additional approximate magnitudes
for 2005la in KUG 1249+278: 2004 Dec. 15, [19.0; 2005 Jan. 16,
[19.0; Dec. 1.49, 17.6. Quimby adds that the position tabulated
above for 2005la has uncertainty +/- 0".8.
A. V. Filippenko and R. J. Foley, University of California,
Berkeley; and T. Matheson, National Optical Astronomy Observatory,
report that inspection of a CCD spectrogram (range 330-930 nm),
obtained on Dec. 4 UT with the Keck I 10-m telescope (+ LRIS),
shows that SN 2005kz is of type Ic, perhaps 1 week after maximum
brightness, with a peculiar spectrum resembling those of SN 1998bw
(Patat et al. 2001, Ap.J. 555, 900) and SN 2002ap (Foley et al.
2003, PASP 115, 1220). The Ca II near-infrared triplet has an
unusually broad absorption trough, thoroughly blended with the O I
777.4-nm line.
Filippenko, Foley, and Matheson add that inspection of a CCD
spectrogram (range 400-900 nm), obtained by J. Cooke and J. C.
Berrier (University of California, Irvine) on Dec. 3 UT with the
Keck II 10-m telescope (+ DEIMOS), shows that SN 2005la is a
peculiar type-II/Ib supernova: "In addition to relatively weak,
narrow hydrogen Balmer lines having P-Cyg profiles, the spectrum
exhibits narrow He I lines with P-Cyg profiles dominated by the
emission component. The recession velocity of the host galaxy is
5570 km/s, based on narrow H_alpha from nearby H II regions. The
supernova expansion velocity, determined from the minima in the
absorption components, is about 1700 km/s. The FWHM of the
emission components is about 1800 km/s. We have previously not
encountered a supernova spectrum having these characteristics.
Further monitoring of the object is encouraged."
(C) Copyright 2005 CBAT
2005 December 4 (8639) Daniel W. E. Green
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