Central Bureau for Astronomical Telegrams
IAUC 8492: 2005ao, 2005ap, 2005aq
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Circular No. 8492
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)
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Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVAE 2005ao, 2005ap, 2005aq
Three supernovae have been found on unfiltered CCD images:
2005ao by T. Puckett and T. Crowley (cf. IAUC 8488; 0.50-m
automated supernova patrol telescope); 2005ap by R. Quimby, P.
Mondol, P. Hoeflich, J. C. Wheeler (all at the University of Texas),
and C. Gerardy (Imperial College) using the 0.45-m ROTSE-IIIb
telescope at McDonald Observatory; and 2005aq by J. Graham and W.
Li (LOSS/KAIT; cf. IAUC 8484).
SN 2005 UT R.A. (2000.0) Decl. Mag. Offset
2005ao Mar. 7.43 17 44 49.64 +61 54 28.1 16.7 5".3 E, 10".9 S
2005ap Mar. 3.30 13 01 14.84 +27 43 31.4 18.5 3".5 W, 3".4 N
2005aq Mar. 7.13 4 31 38.82 - 4 35 06.8 17.3 1".7 E, 10".8 N
Approximate unfiltered CCD magnitudes, by the respective
discoverers unless otherwise noted: SN 2005ao in NGC 6462, 2002
Feb. 13 UT, [20.0 (Puckett); 2003 Apr. 2, [20.0 (Puckett); 2005
Mar. 8.02, 16.6 (G. Sostero, Remanzacco, Italy). SN 2005ap, 2004
Dec. 15, [18.8; 2005 Jan. 14, [18.8; Mar. 4.29, 18.5. SN 2005aq in
NGC 1599, Feb. 2.16, [18.0; Mar. 8.12, 17.2.
Quimby adds nothing is visible on the Digitized Sky Survey at
the location of 2005ap, and a spectrum (range 430-890 nm), obtained
on Mar. 7.46 with the 9.2-m Hobby/Eberly Telescope (+ Marcario Low-
Resolution Spectrograph) by B. Roman and V. Riley, shows a flat
continuum with broad absorption at 526 and 557 nm; there are no
features that would suggest a Galactic source. The spectrum is
similar to the recent CfA spectrum of 2005an (cf. IAUC 8491), but
of higher S/N; as with 2005an, Quimby et al. believe that SN 2005ap
is an early type-II supernova, but given the general lack of
distinct features, they cannot associate it with a template.
M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 340-730 nm)
of SN 2005ao, obtained on Mar. 8.52 UT by H. Hao with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST), shows it to be a
type-Ia supernova with a spectral-feature age (Riess et al. 1997,
A.J. 114, 722) of about -3 (+/- 2) days before maximum light. The
supernova expansion velocity, derived from the minimum of Si II
(rest 635.5 nm) and adopting the NED recession velocity of 11514
km/s for the host galaxy, is about 11000 km/s. They add that a
spectrogram (range 350-740 nm) of SN 2005aq, obtained on Mar. 8.11
UT, shows it to be a type-IIn supernova; the spectrum consists of
strong, intermediate-width (FWHM 800 km/s) Balmer emission lines
with broad wings that are superposed on a nearly featureless and
flat continuum (assuming the NED recession velocity of 4042 km/s
for the host galaxy).
(C) Copyright 2005 CBAT
2005 March 8 (8492) Daniel W. E. Green
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