The transit light curve project. XI. Submillimagnitude photometry of two transits of the bloated planet WASP-4b

Joshua N. Winn; Matthew J. Holman; Joshua A. Carter; Guillermo Torres; David J. Osip; Thomas Beatty

doi:10.1088/0004-6256/137/4/3826

The transit light curve project. XI. Submillimagnitude photometry of two transits of the bloated planet WASP-4b

Joshua N. Winn, Matthew J. Holman, Joshua A. Carter, Guillermo Torres, David J. Osip, Thomas Beatty

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

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 25-40 s. The two midtransit times are determined to within 6 s. 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 ± 0.064 M_Jup and 1.365 ± 0.021 R _Jup, 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 1.75 R_⊕ would have been possible.

Original language	English (US)
Pages (from-to)	3826-3833
Number of pages	8
Journal	Astronomical Journal
Volume	137
Issue number	4
DOIs	https://doi.org/10.1088/0004-6256/137/4/3826
State	Published - Apr 2009
Externally published	Yes

Keywords

planetary systems
stars: individual (WASP-4 = USNO-B1.0 0479-0948995)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-6256/137/4/3826

Cite this

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title = "The transit light curve project. XI. Submillimagnitude photometry of two transits of the bloated planet WASP-4b",

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 25-40 s. The two midtransit times are determined to within 6 s. 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 ± 0.064 MJup and 1.365 ± 0.021 R Jup, 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 1.75 R⊕ would have been possible.",

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author = "Winn, {Joshua N.} and Holman, {Matthew J.} and Carter, {Joshua A.} and Guillermo Torres and Osip, {David J.} and Thomas Beatty",

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AU - Winn, Joshua N.

AU - Holman, Matthew J.

AU - Carter, Joshua A.

AU - Torres, Guillermo

AU - Osip, David J.

AU - Beatty, Thomas

PY - 2009/4

Y1 - 2009/4

N2 - 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 25-40 s. The two midtransit times are determined to within 6 s. 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 ± 0.064 MJup and 1.365 ± 0.021 R Jup, 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 1.75 R⊕ would have been possible.

AB - 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 25-40 s. The two midtransit times are determined to within 6 s. 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 ± 0.064 MJup and 1.365 ± 0.021 R Jup, 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 1.75 R⊕ would have been possible.

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The transit light curve project. XI. Submillimagnitude photometry of two transits of the bloated planet WASP-4b

Abstract

Keywords

ASJC Scopus subject areas

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