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J/A+A/530/A5     WASP-4b Ks-band detection of thermal emission  (Caceres+, 2011)

A ground-based Ks-band detection of the thermal emission from the transiting exoplanet WASP-4b. Caceres C., Ivanov V.D., Minniti D., Burrows A., Selman F., Melo C., Naef D., Mason E., Pietrzynski G. <Astron. Astrophys. 530, A5 (2011)> =2011A&A...530A...5C
ADC_Keywords: Stars, double and multiple ; Planets ; Occultations ; Magnitudes Keywords: planetary systems - eclipses - stars: individual: WASP-4b - techniques: photometric Abstract: Secondary eclipses are a powerful tool to measure directly the thermal emission from extrasolar planets, and to constrain their type and physical parameters. We started a project to obtain reliable broad-band measurements of the thermal emission of transiting exoplanets. Ground-based high-cadence near-infrared relative photometry was used to obtain a sub-millimagnitude precision light curve of a secondary eclipse of WASP-4b -- a 1.12MJ hot Jupiter on a 1.34-day orbit around G7V star. The data show a clear ∼10σ detection of the planet's thermal emission at 2.2µ. The calculated thermal emission corresponds to a fractional eclipse depth of 0.185+0.014-0.013%, with a related brightness temperature in Ks of TB=1995±40K, centered at Tc=2455102.61162+0.00071-0.00077HJD. We could set a limit on the eccentricity of e*cosω=0.0027±0.0018, compatible with a near-circular orbit. The calculated brightness temperature, and the specific models suggest a highly inefficient redistribution of heat from the day-side to the night-side of the planet, and a consequent emission mainly from the day-side. The high-cadence ground-based technique is capable of detecting the faint signal of the secondary eclipse of extrasolar planets, which makes it a valuable complement to space-based mid-IR observations. Description: The relative photometric series of the Ks-band occultation of the planet WASP-4b. Extra digits are given to avoid round-up errors. Objects: ---------------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------------- 23 34 15.1 -42 03 41 WASP-4 = 1SWASP J233415.06-420341.1 ---------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 31 24071 Secondary eclipse light curve
See also: J/MNRAS/408/1680 : WASP-2 transiting planetary system (Southworth+, 2010) J/MNRAS/399/287 : WASP-4 transiting planetary system (Southworth+, 2009) J/AJ/137/3826 : WASP-4b, two transits of the giant planet (Winn+, 2009) J/MNRAS/396/1023 : WASP-5 transiting planetary system (Southworth+, 2009) J/A+A/501/785 : WASP-6b, discovery and characterization of (Gillon+, 2009) J/A+A/527/A8 : WASP-7 transiting planetary system (Southworth+, 2011) J/A+A/517/L1 : WASP-8b radial velocities (Queloz+, 2010) J/ApJ/692/L100 : WASP-10 relative photometry (Johnson+, 2009) J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011) J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009) J/ApJ/707/167 : WASP-18 transiting planetary system (Southworth+, 2009) J/A+A/513/L3 : WASP-19b H-band thermal emission (Anderson+, 2010) J/A+A/519/A98 : WASP-21b transit (Bouchy+, 2010) J/A+A/520/A56 : WASP-26b RV and photometric data (Smalley+, 2010) J/A+A/526/L10 : WASP-33 photometric follow-up (Herrero+, 2011) J/A+A/526/A130 : WASP-34b photometry and radial velocities (Smalley+, 2011) J/A+A/525/A54 : WASP-38b transits (Barros+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 F15.7 d HJD Heliocentric Julian Date 17- 23 F7.5 --- Flux Normalized flux 25- 31 F7.5 --- e_Flux Flux error estimation
Acknowledgements: Claudio Caceres, cccacere(at)
(End) C. Caceres [P. Univ. Catolica de Chile], P. Vannier [CDS] 08-Apr-2011
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