Central Bureau for Astronomical Telegrams
IAUC 7985: epsilon Eri, upsilon And, 51 Peg, HD 209458, HD 196050; 2002gb
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Circular No. 7985
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)
epsilon ERIDANI, upsilon ANDROMEDAE, 51 PEGASI, HD 209458, HD 196050
L. Greenhill, Smithsonian Astrophysical Observatory, reports
the nondetection of water-maser emission from five extrasolar
planetary systems, including two from which water emission has been
reported [Muir 2002, New Scientist 175(2361), 22], noting that
young planetary systems may contain water in planets' atmospheres,
interplanetary material, and comets. Cometary water-maser emission
is not commonplace in the solar system (Graham et al. 2000, A.J.
119, 2465), but comet-planet impacts may be a source of transient
maser emission (Cosmovici 2000, ASP Conf. Ser. 213, 151).
Observations were made of epsilon Eri on Sept. 21.7, 27.7, and 28.7
UT by P. Kondratko and J. Lovell with the 70-m NASA Deep Space
Network (DSN) antenna (+ 400-MHz Smithsonian and 16-MHz Australia
Telescope correlation spectrometers) near Canberra. On Sept. 21
and 27, the 400-MHz correlator generated spectra with 1-sigma-noise
levels of 14 and 28 mJy (flux densities corrected for sky opacity),
respectively, in each 1.3-km/s channel between heliocentric
velocities about -2650 and +2650 km/s. On Sept. 27 and 28, the
16-MHz correlator generated spectra with 1-sigma-noise levels in
each 0.42-km/s channel of 46 mJy over -90 to +126 km/s and of 30
mJy over -25 to +191 km/s, respectively. J. F. Gomez, I. de
Gregorio-Monsalvo, and T. Kuiper conducted observations of upsilon
And using the DSN 70-m antenna (+ 10-MHz spectrometer) near Madrid
on Sept. 24.0 and 25.9. The 1-sigma-noise levels for 0.53-km/s
channels were 29, 74, and 47 mJy over velocity intervals of -253 to
-132, -122 to +6, and +21 to +140 km/s, respectively. On Sept.
27.7, Lovell and Kondratko also observed upsilon And in Canberra
with both correlators and obtained 1-sigma noise levels of 73 mJy
over about -2650 to +2650 km/s (with 1.3-km/s channels) and 64 mJy
over -42 to +174 km/s (with 0.42-km/s channels). Systemic
velocities observed are +15.5 km/s for epsilon Eri and -28.3 km/s
for upsilon And. Between Sept. 21.3 and 21.6, Kondratko and Lovell
also obtained nondetections at Canberra over about -2650 to +2650
km/s (with 1.3-km/s channels) for 51 Peg (25 mJy), HD 209458 (22
mJy), and HD 196050 (28 mJy).
SUPERNOVA 2002gb
Corrigendum. On IAUC 7983, line 8, the offset for SN 2002gb
should read 1".4 N
(C) Copyright 2002 CBAT
2002 October 6 (7985) Daniel W. E. Green
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