J/ApJ/650/1160 BVRIr photometry of HD 189733 (Bakos+, 2006)
Refined parameters of the planet orbiting HD 189733.
Bakos G.A., Knutson H., Pont F., Moutou C., Charbonneau D., Shporer A.,
Bouchy F., Everett M., Hergenrother C., Latham D.W., Mayor M., Mazeh T.,
Noyes R.W., Queloz D., Pal A., Udry S.
<Astrophys. J., 650, 1160-1171 (2006)>
=2006ApJ...650.1160B 2006ApJ...650.1160B
ADC_Keywords: Planets ; Stars, nearby ; Photometry, UBVRI
Keywords: planetary systems - stars: individual (HD 189733)
Abstract:
We report on the BVRI multiband follow-up photometry of the transiting
extrasolar planet HD 189733b. We revise the transit parameters and
find a planetary radius of Rp=1.154±0.033RJ and an inclination of
iP=89.79±0.24°. The new density (∼1g/cm3) is significantly
higher than the former estimate (∼0.75g/cm3); this shows that from
the current sample of nine transiting planets, only HD 209458 (and
possibly OGLE-10b) have anomalously large radii and low densities. We
note that due to the proximity of its parent star, HD 189733b
currently has one of the most precise radius determinations among
extrasolar planets. We calculate new ephemerides,
P=2.218573±0.000020-days and T0=2453639.39420±0.00024 (HJD), and
estimate the timing offsets of the 11 distinct transits with respect
to the predictions of a constant orbital period, which can be used to
reveal the presence of additional planets in the system.
Description:
The following telescopes were involved in the photometric monitoring:
the 1m telescope at the Wise Observatory, Israel; the 1.2m telescope
at OHP; the 1.2m telescope at the Fred Lawrence Whipple Observatory
(FLWO) of the Smithsonian Astrophysical Observatory (SAO); the 0.11m
HAT-5 and HAT-6 wide-field telescopes plus the 0.26m TopHAT
telescope, also at FLWO; and the 0.11m HAT-9 telescope at the
Submillimeter Array site at Mauna Kea, Hawaii.
Objects:
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RA (2000) DE Designation(s)
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20 00 43.7 +22 42 39 HD 189733 = V* V452 Vul
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 84 2938 The light-curve of HD 189733
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See also:
J/A+A/476/1347 : HST/ACS flux time series for HD 189733 (Pont+, 2007)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Tel Telescope used in the observation
9 A1 --- Filt [BVRIr] Filter used in the observation
11- 12 I2 --- Ntr Transit number (1)
14- 28 F15.7 d HJD Heliocentric Julian Date of observation
30- 35 F6.4 mag mag Observed magnitude in Filt (2)
37- 42 F6.4 mag e_mag ? Formal error estimate in mag (3)
44- 50 F7.5 --- FR Flux ratio (4)
52- 58 F7.5 --- FRcorr Merger-corrected flux ratio (5)
60- 66 F7.5 --- e_FR ? Formal error estimate in FR (3)
68- 73 F6.3 mag dExt ? Measure of extinction on a relative scale (6)
75- 80 F6.4 mag sigfit ? The RMS of the magnitude fit (7)
82- 84 A3 --- Qflag Quality flag (8)
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Note (1): Since the discovery data by OHP on HJD=2453629.3.
Note (2): Values have been derived by shifting the zero-point of the
particular dataset at Ntr to bring the median of the OOT section to
the standard magnitude value in the literature.
Note (3): Based on the photon and background noise (not available for all data).
Note (4): The ratio of the individual flux measurements to the sigma-clipped
median value of the OOT at that particular Ntr transit observation.
Note (5): Described in detail in Section 2.6.
Note (6): Instrumental magnitude of reference minus image, i.e. extinction.
Note (7): Both DelMext and sigmfit are useful measures of the photometric
conditions.
Note (8): Quality flag as follows:
G = good
C = measurement should be used with caution, e.g. the star was
marked as saturated
ERR = error
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 21-Jul-2008