J/AJ/137/3826 Two transits of the giant planet WASP-4b (Winn+, 2009)
The transit light curve project.
XI. Submillimagnitude photometry of two transits of the bloated planet WASP-4b.
Winn J.N., Holman M.J., Carter J.A., Torres G., Osip D.J., Beatty T.
<Astron. J., 137, 3826-3833 (2009)>
=2009AJ....137.3826W 2009AJ....137.3826W
ADC_Keywords: Stars, variable ; Planets ; Photometry
Keywords: planetary systems - stars: individual: WASP-4 = USNO-B1.0 0479-0948995
Abstract:
We present photometry of two transits of the giant planet WASP-4b with
a photometric precision of 400-800 parts per million and a time
sampling of 25-40s. The two midtransit times are determined to within
6s. Together with previously published times, the data are consistent
with a constant orbital period, giving no compelling evidence for
period variations that would be produced by a satellite or additional
planets. Analysis of the new photometry, in combination with
stellar-evolutionary modeling, gives a planetary mass and radius of
1.237±0.064MJup and 1.365±0.021RJup, respectively. The planet
is 15% larger than expected based on previously published models of
solar-composition giant planets. With data of the quality presented
here, the detection of transits of a "super-Earth" of radius
1.75R{earth} would have been possible.
Description:
We observed the transits of UT 2008 August 19 and 2008 October 9 with
the Baade 6.5 m telescope, one of the two Magellan telescopes at Las
Campanas Observatory in Chile.
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 32 713 Relative Photometry of WASP-4
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See also:
J/ApJ/652/1715 : Four transits of the exoplanet XO-1b (Holman+, 2006)
J/AJ/133/11 : Photometry of OGLE-TR 111 (Winn+, 2007)
J/ApJ/657/1098 : Transit of TrES-1 (Winn+, 2007)
J/ApJ/655/1103 : Five transits of the exoplanet OGLE-TR-10b (Holman+, 2007)
J/AJ/133/1828 : Transit light curves of HD 189733 (Winn+, 2007)
J/ApJ/664/1185 : Three transits of the exoplanet TrES-2 (Holman+, 2007)
J/AJ/134/1707 : Six transit of exoplanet HAT-P-1b (Winn+, 2007)
J/AJ/136/267 : Six occultations of the exoplanet TrES-3 (Winn+, 2008)
J/ApJ/683/1076 : Transits of exoplanet XO-3b (Winn+, 2008)
J/ApJ/693/794 : Transit of exoplanet HD 17156b (Winn+, 2009)
J/AJ/137/4911 : Six transits of the exoplanet XO-2b (Fernandez+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 --- BJD Barycentric Julian Date at midexposure
16- 23 F8.6 --- Rflux Relative flux
25- 32 F8.6 --- e_Rflux Uncertainty in Rflux (discussed in Sec. 3)
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History:
From electronic version of the journal
References:
Holman et al., Paper I 2006ApJ...652.1715H 2006ApJ...652.1715H, Cat. J/ApJ/652/1715
Winn et al., Paper II 2007AJ....133...11W 2007AJ....133...11W, Cat. J/AJ/133/11
Winn et al., Paper III 2007ApJ...657.1098W 2007ApJ...657.1098W, Cat. J/ApJ/657/1098
Holman et al., Paper IV 2007ApJ...655.1103H 2007ApJ...655.1103H, Cat. J/ApJ/655/1103
Winn et al., Paper V 2007AJ....133.1828W 2007AJ....133.1828W, Cat. J/AJ/133/1828
Holman et al. Paper VI 2007ApJ...664.1185H 2007ApJ...664.1185H, Cat. J/ApJ/664/1185
Winn et al., Paper VII 2007AJ....134.1707W 2007AJ....134.1707W, Cat. J/AJ/134/1707
Winn et al., Paper VIII 2008AJ....136..267W 2008AJ....136..267W, Cat. J/AJ/136/267
Winn et al., Paper IX 2008ApJ...683.1076W 2008ApJ...683.1076W, Cat. J/ApJ/683/1076
Winn et al., Paper X 2009ApJ...693..794W 2009ApJ...693..794W, Cat. J/ApJ/693/794
Winn et al., Paper XI 2009AJ....137.3826W 2009AJ....137.3826W, Cat. J/AJ/137/3826
Fernandez et al., Paper XII 2009AJ....137.4911F 2009AJ....137.4911F, Cat. J/AJ/137/4911
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 09-Aug-2009