A precise estimate of the radius of HD 149026b

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

doi:10.1017/S1743921308026951

A precise estimate of the radius of HD 149026b

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

Abstract

We present Spitzer 8 μm transit observations of the extrasolar planet system 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 of i = 85°.4 ^+0°.9_-0°.8 and a planet radius of 0.755 ± 0.040 RJ. These measurements further support models in which the planet is greatly enriched in heavy elements.

Original language	English (US)
Pages (from-to)	466-469
Number of pages	4
Journal	Proceedings of the International Astronomical Union
Volume	4
Issue number	S253
DOIs	https://doi.org/10.1017/S1743921308026951
State	Published - May 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1017/S1743921308026951

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title = "A precise estimate of the radius of HD 149026b",

abstract = "We present Spitzer 8 μm transit observations of the extrasolar planet system 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 of i = 85°.4 +0°.9-0°.8 and a planet radius of 0.755 ± 0.040 RJ. These measurements further support models in which the planet is greatly enriched in heavy elements.",

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",

year = "2008",

month = may,

doi = "10.1017/S1743921308026951",

language = "English (US)",

volume = "4",

pages = "466--469",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

number = "S253",

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TY - JOUR

T1 - A precise estimate of the radius of HD 149026b

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 - 2008/5

Y1 - 2008/5

N2 - We present Spitzer 8 μm transit observations of the extrasolar planet system 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 of i = 85°.4 +0°.9-0°.8 and a planet radius of 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 system 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 of i = 85°.4 +0°.9-0°.8 and a planet radius of 0.755 ± 0.040 RJ. These measurements further support models in which the planet is greatly enriched in heavy elements.

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JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

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A precise estimate of the radius of HD 149026b

Abstract

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