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 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:
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RA (2000) DE Designation(s)
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23 34 15.1 -42 03 41 WASP-4 = 1SWASP J233415.06-420341.1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 31 24071 Secondary eclipse light curve
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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
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Bytes Format Units Label Explanations
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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
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Acknowledgements:
Claudio Caceres, cccacere(at)astro.puc.cl
(End) C. Caceres [P. Univ. Catolica de Chile], P. Vannier [CDS] 08-Apr-2011