J/A+A/564/A6 Near-infrared emission from the dayside of WASP-5b (Chen+, 2014)
Ground-based detection of the near-infrared emission from the dayside of
WASP-5b.
Chen G., van Boekel R., Madhusudhan N., Wang H., Nikolov N., Seemann U.,
Henning T.
<Astron. Astrophys. 564, A6 (2014)>
=2014A&A...564A...6C 2014A&A...564A...6C
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, infrared
Keywords: infrared: planetary systems - stars: individual: WASP-5 -
occultations - techniques: photometric -
planets and satellites: atmospheres
Abstract:
WASP-5b is a highly irradiated dense hot Jupiter orbiting a G4V star
every 1.6 days. We observed two secondary eclipses of WASP-5b in the
J, H and K bands simultaneously. Thermal emission of WASP-5b is
detected in the J and K bands. The retrieved planet-to-star flux
ratios in the J and K bands are 0.168 +0.050/-0.052% and
0.269±0.062%, corresponding to brightness temperatures of 2996
+212/-261K and 2890 +246/-269K, respectively. No thermal emission is
detected in the H band, with a 3-sigma upper limit of 0.166%,
corresponding to a maximum temperature of 2779K. On the whole, our J,
H, K results can be explained by a roughly isothermal temperature
profile of ∼2700K in the deep layers of the planetary dayside
atmosphere that are probed at these wavelengths. Together with Spitzer
observations, which probe higher layers that are found to be at
∼1900K, a temperature inversion is ruled out in the range of pressures
probed by the combined data set. While an oxygen-rich model is unable
to explain all the data, a carbon-rich model provides a reasonable fit
but violates energy balance.
Description:
3 occultation light curves of the hot Jupiter WASP-5b obtained on UT
2011/09/08 using the GROND camera on the MPG/ESO 2.2m telescope.
Objects:
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RA (2000) DE Designation(s)
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23 57 23.759 -41 16 37.74 WASP-5 = GSC 08018-00199
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
occ_j.dat 86 699 J occultation light curve of WASP-5b on 2011/09/08
occ_h.dat 86 699 H occultation light curve of WASP-5b on 2011/09/08
occ_k.dat 86 699 K occultation light curve of WASP-5b on 2011/09/08
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See also:
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/A+A/563/A40 : WASP-43b g'r'i'z'JHK light curves (Chen+, 2014)
Byte-by-byte Description of file: occ_h.dat occ_j.dat occ_k.dat
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Bytes Format Units Label Explanations
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1 A1 --- Band [JHK] Observed band
3- 16 F14.6 d BJD Barycentric Julian Date (TDB standard)
18- 25 F8.6 --- RFluxc [0.988/1.012] Corrected relative flux
27- 34 F8.6 --- e_RFluxc Corrected flux error
36- 43 F8.6 --- RFluxr [0.982/1.018] Raw relative flux in Band
45- 52 F8.6 --- e_RFluxr Raw flux error
54- 59 F6.2 --- dX Relative position drift in X direction
61- 66 F6.2 --- dY Relative position drift in Y direction
68- 73 F6.2 --- FWHMx FWHM in X direction
75- 80 F6.2 --- FWHMy FWHM in Y direction
82- 86 F5.3 --- AirM Airmass
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Acknowledgements:
Guo Chen, guochen(at)pmo.ac.cn
(End) Guo Chen [PMO], Patricia Vannier [CDS] 04-Mar-2014