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System Parameters of the Transiting Extrasolar Planet HD 209458b | | Robert A. Wittenmyer
; William F. Welsh
; Jerome A. Orosz
; A.B. Schultz
; W. Kinzel
; M. Kochte
; F. Bruhweiler
; D. Bennum
; Gregory W. Henry
; G.W. Marcy
; D.A. Fischer
; R.P. Butler
; S.S. Vogt
; | | Date: |
26 Apr 2005 | | Subject: | astro-ph | | Abstract: | We derive improved system parameters for the HD 209458 system using a model that simultaneously fits both photometric transit and radial velocity observations. The photometry consists of previous Hubble Space Telescope STIS and FGS observations, twelve I-band transits observed between 2001-2003 with the Mt. Laguna Observatory 1m telescope, and six Stromgren b+y transits observed between 2001-2004 with two of the Automatic Photometric Telescopes at Fairborn Observatory. The radial velocities were derived from Keck/HIRES observations. The model properly treats the orbital dynamics of the system, and thus yields robust and physically self-consistent solutions. Our set of system parameters agrees with previously published results though with improved accuracy. For example, applying robust limits on the stellar mass of 0.93-1.20Msun, we find 1.26 < Rplanet < 1.42 Rjup and 0.59 < Mplanet < 0.70 Mjup. We can reduce the uncertainty on these estimates by including a stellar mass-radius relation constraint, yielding Rplanet = 1.35 +/- 0.07 Rjup and Mplanet = 0.66 +/- 0.04 Mjup. Our results verify that the planetary radius is 10-20% larger than predicted by planet evolution models, confirming the need for an additional mechanism to slow the evolutionary contraction of the planet. A revised ephemeris is derived, T0=2452854.82545 + 3.52474554E (HJD), which now contains an uncertainty in the period of 0.016s and should facilitate future searches for planetary satellites and other bodies in the HD 209458 system. | | Source: | arXiv, astro-ph/0504579 | | Services: | Forum | Review | PDF | Favorites | |
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