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. =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+/-0.033R_J_ and an inclination of i_P_=89.79+/-0.24{deg}. The new density (~1g/cm^3^) is significantly higher than the former estimate (~0.75g/cm^3^); 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: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 20 00 43.7 +22 42 39 HD 189733 = V* V452 Vul -------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table3.dat 84 2938 The light-curve of HD 189733 -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Patricia Vannier [CDS] 21-Jul-2008