A precise estimate of the radius of the exoplanet HD 149026b from spitzer photometry

Philip Nutzman; David Charbonneau; Joshua N. Winn; Heather A. Knutson; Jonathan J. Fortney; Matthew J. Holman; Eric Agol

doi:10.1088/0004-637X/692/1/229

A precise estimate of the radius of the exoplanet HD 149026b from spitzer photometry

Philip Nutzman, David Charbonneau, Joshua N. Winn, Heather A. Knutson, Jonathan J. Fortney, Matthew J. Holman, Eric Agol

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

21 Scopus citations

Abstract

We present Spitzer 8 μm transit observations of the extrasolar planet HD 149026b. At this wavelength, transit light curves are weakly affected by stellar limb darkening, allowing for a simpler and more accurate determination of planetary parameters. We measure a planet-star radius ratio of R_p /R* = 0.05158 ± 0.00077, and in combination with ground-based data and independent constraints on the stellar mass and radius, we derive an orbital inclination i = 85°.4^+0°.9_-0°.8 of and a planet radius of R_p = 0.755 ± 0.040 R_J. These measurements further support models in which the planet is greatly enriched in heavy elements.

Original language	English (US)
Pages (from-to)	229-235
Number of pages	7
Journal	Astrophysical Journal
Volume	692
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/692/1/229
State	Published - Feb 10 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planetary systems
techniques: photometric

Access to Document

10.1088/0004-637X/692/1/229

Cite this

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title = "A precise estimate of the radius of the exoplanet HD 149026b from spitzer photometry",

abstract = "We present Spitzer 8 μm transit observations of the extrasolar planet HD 149026b. At this wavelength, transit light curves are weakly affected by stellar limb darkening, allowing for a simpler and more accurate determination of planetary parameters. We measure a planet-star radius ratio of Rp /R* = 0.05158 ± 0.00077, and in combination with ground-based data and independent constraints on the stellar mass and radius, we derive an orbital inclination i = 85°.4+0°.9-0°.8 of and a planet radius of Rp = 0.755 ± 0.040 RJ. These measurements further support models in which the planet is greatly enriched in heavy elements.",

keywords = "planetary systems, techniques: photometric",

author = "Philip Nutzman and David Charbonneau and Winn, {Joshua N.} and Knutson, {Heather A.} and Fortney, {Jonathan J.} and Holman, {Matthew J.} and Eric Agol",

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doi = "10.1088/0004-637X/692/1/229",

language = "English (US)",

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T1 - A precise estimate of the radius of the exoplanet HD 149026b from spitzer photometry

AU - Nutzman, Philip

AU - Charbonneau, David

AU - Winn, Joshua N.

AU - Knutson, Heather A.

AU - Fortney, Jonathan J.

AU - Holman, Matthew J.

AU - Agol, Eric

PY - 2009/2/10

Y1 - 2009/2/10

N2 - We present Spitzer 8 μm transit observations of the extrasolar planet HD 149026b. At this wavelength, transit light curves are weakly affected by stellar limb darkening, allowing for a simpler and more accurate determination of planetary parameters. We measure a planet-star radius ratio of Rp /R* = 0.05158 ± 0.00077, and in combination with ground-based data and independent constraints on the stellar mass and radius, we derive an orbital inclination i = 85°.4+0°.9-0°.8 of and a planet radius of Rp = 0.755 ± 0.040 RJ. These measurements further support models in which the planet is greatly enriched in heavy elements.

AB - We present Spitzer 8 μm transit observations of the extrasolar planet HD 149026b. At this wavelength, transit light curves are weakly affected by stellar limb darkening, allowing for a simpler and more accurate determination of planetary parameters. We measure a planet-star radius ratio of Rp /R* = 0.05158 ± 0.00077, and in combination with ground-based data and independent constraints on the stellar mass and radius, we derive an orbital inclination i = 85°.4+0°.9-0°.8 of and a planet radius of Rp = 0.755 ± 0.040 RJ. These measurements further support models in which the planet is greatly enriched in heavy elements.

KW - planetary systems

KW - techniques: photometric

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A precise estimate of the radius of the exoplanet HD 149026b from spitzer photometry

Abstract

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