J/A+A/550/A54 Ks-band observations of WASP-33b (de Mooij+, 2013)
The GROUSE project.
III. Ks-band observations of the thermal emission from WASP-33b.
de Mooij E.J.W., Brogi M., De Kok R.J., Snellen I.A.G., Kenworthy M.A.,
Karjalainen R.
<Astron. Astrophys., 550, A54 (2013)>
=2013A&A...550A..54D 2013A&A...550A..54D
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, infrared
Keywords: techniques: photometric - stars: individual: WASP-33 -
planets and satellites: atmospheres
Abstract:
In recent years, day-side emission from about a dozen hot Jupiters has
been detected through ground-based secondary eclipse observations in
the near-infrared. These near-infrared observations are vital for
determining the energy budgets of hot Jupiters, since they probe the
planet-spectral energy distribution near its peak.
The aim of this work is to measure the Ks -band secondary eclipse
depth of WASP-33b, the first planet discovered to transit an A-type
star. This planet receives the highest level of irradiation of all
transiting planets discovered to date. Furthermore, its host-star
shows pulsations and is classified as a low-amplitude delta-Scuti.
As part of our GROUnd-based Secondary Eclipse (GROUSE) project we have
obtained observations of two separate secondary eclipses of WASP-33b
in the Ks-band using the LIRIS instrument on the William Herschel
Telescope (WHT). The telescope was significantly defocused to avoid
saturation of the detector for this bright star (K∼7.5). To increase
the stability and the cadence of the observations, they were performed
in staring mode. We collected a total of 5100 and 6900 frames for the
first and the second night respectively, both with an average cadence
of 3.3 seconds.
On the second night the eclipse is detected at the 12-sigma level,
with a measured eclipse depth of 0.244-020+0.027%. This eclipse
depth corresponds to a brightness temperature of 3270_-160+115K. The
measured brightness temperature on the second night is consistent with
the expected equilibrium temperature for a planet with a very low
albedo and a rapid re-radiation of the absorbed stellar light. For the
other night the short out-of-eclipse baseline prevents good
corrections for the stellar pulsations and systematic effects, which
makes this dataset unreliable for eclipse depth measurements. This
demonstrates the need of getting a sufficient out-of-eclipse baseline.
Description:
The lightcurves of two secondary eclipses of WASP-33b observed in the
Ks-band with LIRIS on August 18 and September 20, 2010 respectively.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
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02 26 51.06 +37 33 01.7 WASP-33 = HD 15082
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
aug2010.dat 66 4854 Lightcurves for the night of 2010-08-18
sep2010.dat 66 6147 Lightcurves for the night of 2010-09-20
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See also:
J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)
J/ApJ/715/421 : Relative photometry of WASP-3 (Tripathi+, 2010)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)
J/A+A/530/A5 : WASP-4b thermal emission Ks-band detection (Caceres+, 2011)
J/A+A/539/A159 : WASP-4b transit griz light curves (Nikolov+, 2012)
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)
J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)
J/A+A/517/L1 : Radial velocities of WASP-8b planet (Queloz+, 2010)
J/ApJ/692/L100 : Relative photometry of WASP-10 (Johnson+, 2009)
J/A+A/535/A7 : Transit light curves of WASP-10 b (Maciejewski+, 2011)
J/ApJ/720/872 : A spectropolarimetric analysis of WASP-12 (Fossati+, 2010)
J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011)
J/AJ/141/179 : Transits of TrES-4b, HAT-P-3b and WASP-12b (Chan+, 2011)
J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)
J/ApJ/709/159 : Relative Ic photometry of WASP-17 (Anderson+, 2010)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/A+A/513/L3 : WASP-19b H-band thermal emission (Anderson+, 2010)
J/A+A/519/A98 : Transit of exoplanet WASP-21b (Bouchy+, 2010)
J/A+A/534/A16 : WASP-22 & WASP-26 photometry & velocities (Anderson+, 2011)
J/A+A/531/A24 : WASP-23 photometric and radial velocity data (Triaud+, 2011)
J/A+A/520/A56 : WASP-26b RV and photometric data (Smalley+, 2010)
J/ApJ/726/L19 : Gunn r photometry of WASP-30 (Anderson+, 2011)
J/A+A/531/A60 : WASP-31b photometry and radial velocities (Anderson+, 2011)
J/A+A/526/A130 : WASP-34b photometry and radial velocities (Smalley+, 2011)
J/A+A/525/A54 : Transits of WASP-38b (Barros+, 2011)
J/A+A/531/A40 : Transits of WASP-39b (Faedi+, 2011)
J/A+A/542/A4 : WASP-43b thirty eclipses (Gillon+, 2012)
J/A+A/544/A72 : WASP-42 and WASP-49 photometry and velocities (Lendl+, 2012)
J/A+A/533/A88 : WASP-50b photometry and radial velocities (Gillon+, 2011)
J/A+A/547/A61 : WASP78 and WASP79 RV and photometric data (Smalley+, 2012)
J/A+A/526/L10 : Transits of WASP-33 (Herrero+, 2011)
Byte-by-byte Description of file: aug2010.dat sep2010.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian Date of observation
17- 24 F8.5 --- NFlux Normalised flux
27- 34 F8.5 --- e_NFlux Uncertainty on NFlux
37- 46 F10.3 --- XC Shift in X-centroid
49- 54 F6.4 --- AirM Airmass
57- 66 F10.3 --- Sky Sky background
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Acknowledgements:
Ernst de Mooij, demooij(at)astro.utoronto.ca
References:
de Mooij & Snellen, Paper I 2009A&A...493L..35D 2009A&A...493L..35D
de Mooij et al., Paper II 2011A&A...528A..49D 2011A&A...528A..49D, Cat. J/A+A/528/A49
(End) Patricia Vannier [CDS] 08-May-2013