Paper: astro-ph/0507217
Date: Fri, 8 Jul 2005 18:43:57 GMT (18kb)

Title: Period Relation for the 2:1 resonance in the GJ876 planetary system

Authors: Michael Nauenberg
Comments: 5 pages 9 figures
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The recent radial velocity Keck data for GJ876 in Laughlin et al. (2005) is
shown to be in good agreement, apart from a 6 m/s scatter, with a theoretical
calculation (Nauenberg, 2002) based on orbital parameters from a fit to the
earlier Keck data. The time variation of the periods of the inner and outer
planets, which are locked in a near 2:1 resonance, are evaluated, and their
mean values, Pi and Po, are shown to satisfy closely the relation Po/Pi=2+Po/P,
where P is the period for the retrograde precesion of the common mean
periastron of these planets.

\\ ( http://arXiv.org/abs/astro-ph/0507217 , 18kb)

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Paper: astro-ph/0504579
replaced with revised version Fri, 8 Jul 2005 15:40:58 GMT (217kb)

Title: System Parameters of the Transiting Extrasolar Planet HD 209458b

Authors: 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
Comments: 30 pages, 5 figures. Accepted for publication in ApJ

\\ ( http://arXiv.org/abs/astro-ph/0504579 , 217kb)