J/A+A/528/A49 HAT-P-1b Ks-band secondary eclipse (de Mooij +, 2011)
The GROUSE project.
II: Detection of the Ks-band secondary eclipse of exoplanet HAT-P-1b.
de Mooij E.J.W., de Kok R.J., Nefs S.V., Snellen I.A.G.
<Astron. Astrophys. 528, A49 (2011)>
=2011A&A...528A..49D 2011A&A...528A..49D
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, infrared
Keywords: techniques: photometric - stars: individual: HAT-P-1 -
planets and satellites: individual: HAT-P-1b
Abstract:
Only recently it has become possible to measure the thermal emission
from hot-Jupiters at near-Infrared wavelengths using ground-based
telescopes, by secondary eclipse observations. This allows the planet
flux to be probed around the peak of its spectral energy distribution,
which is vital for the understanding of its energy budget.
The aim of the reported work is to measure the eclipse depth of the
planet HAT-P-1b at 2.2micron. This planet is an interesting case,
since the amount of stellar irradiation it receives falls in between
that of the two best studied systems (HD209458 and HD189733), and it
has been suggested to have a weak thermal inversion layer.
We have used the LIRIS instrument on the William Herschel Telescope
(WHT) to observe the secondary eclipse of HAT-P-1b in the Ks-band, as
part of our Ground-based secondary eclipse (GROUSE) project. The
observations were done in staring mode, while significantly defocusing
the telescope to avoid saturation on the K=8.4 star. With an average
cadence of 2.5 seconds, we collected 6520 frames during one night.
Description:
Ks-band time-series photometry of HAT-P-1b and a reference star
observed with LIRIS on the WHT. A radius of 14 pixels was used for the
aperture photometry. Also included are relevant observables as the sky
background per pixel, the airmass, the rotator angle of the
instrument, the exposure time, the position of the star on the chip,
the Julian date (N.B.: not HJD), and the orbital phase as calculated
using parameters from Johnson et al., 2008ApJ...686..649J 2008ApJ...686..649J,
(P=4.4652934 and T0=2454363.946560d).
Objects:
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RA (2000) DE Designation(s)
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22 57 46.8 +38 40 30 HAT-P-1 = BD+37 4734s
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hatp1_ks.dat 102 5541 Ks-band time-series photometry of HAT-P-1b
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See also:
J/AJ/134/1707 : Six transits of exoplanet HAT-P-1b (Winn+, 2007)
J/A+A/523/A84 : Transit light curves of HAT-P-13b (Szabo+, 2010)
J/A+A/527/A85 : Light curves of HAT-P-3b and HAT-P-14b (Nascimbeni+, 2011)
J/A+A/550/A54 : Ks-band observations of WASP-33b (de Mooij+, 2013)
Byte-by-byte Description of file: hatp1_ks.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d JD Julian Date of observation
17- 25 F9.7 --- Phase Calculated orbital phase of HAT-P-1b (1)
28- 37 F10.3 --- Fhatp1 Flux of the target (HAT-P-1), in ADU units
40- 50 F11.3 --- Fref Flux of the reference star, in ADU units
53- 60 F8.3 pix-1 Sky Background per pixel, in ADU/pix units
63- 65 F3.1 s TExp Exposure time
68- 74 F7.5 --- Airmass Airmass
77- 84 F8.4 deg mountPA Position angle of the mount
87- 93 F7.3 --- Xpos X-position of HAT-P-1 on the detector
96-102 F7.3 --- Ypos Y-position of HAT-P-1 on the detector
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Note (1): Orbital phase calculated using the ephemeris from Johnson et al.
(2008ApJ...686..649J 2008ApJ...686..649J)
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Acknowledgements:
E. de Mooij, demooij(at)strw.leidenuniv.nl
References:
de Mooij & Snellen, Paper I 2009A&A...493L..35D 2009A&A...493L..35D
de Mooij et al., Paper III 2013A&A...550A..54D 2013A&A...550A..54D, Cat. J/A+A/550/A54
(End) E. de Mooij [Leiden Obs., Leiden Univ.], P. Vannier [CDS] 31-Jan-2011