2008ApJ...687.1191L


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET19:56:44

2008ApJ...687.1191L - Astrophys. J., 687, 1191-1200 (2008/November-2)

Theoretical radii of extrasolar giant planets: the cases of TrES-4, XO-3b, and HAT-P-1b.

LIU X., BURROWS A. and IBGUI L.

Abstract (from CDS):

To explain their observed radii, we present theoretical radius-age trajectories for the extrasolar giant planets (EGPs) TrES-4, XO-3b, and HAT-P-1b. We factor in variations in atmospheric opacity, the presence of an inner heavy-element core, and possible heating due to orbital tidal dissipation. A small, yet nonzero, degree of core heating is needed to explain the observed radius of TrES-4, unless its atmospheric opacity is significantly larger than a value equivalent to that at 10xsolar metallicity with equilibrium molecular abundances. This heating rate is reasonable, and corresponds for an energy dissipation parameter (Qp) of ∼103.8 to an eccentricity of ∼0.01, assuming 3xsolar atmospheric opacity and a heavy-element core of Mc=30 M. For XO-3b, which has an observed orbital eccentricity of 0.26, we show that tidal heating needs to be taken into account to explain its observed radius. Furthermore, we reexamine the core mass needed for HAT-P-1b in light of new measurements and find that it now generally follows the correlation between stellar metallicity and core mass suggested recently. Given various core heating rates, theoretical grids and fitting formulae for a giant planet's equilibrium radius and equilibration timescale are provided for planet masses Mp=0.5, 1.0, and 1.5 MJ with a=0.02-0.06 AU, orbiting a G2 V star. When the equilibration timescale is much shorter than that of tidal heating variation, the ``effective age'' of the planet is shortened, resulting in evolutionary trajectories more like those of younger EGPs. Motivated by the work of B. Jackson et al., we suggest that this effect could indeed be important in better explaining some observed transit radii.

Abstract Copyright:

Journal keyword(s): Planets and Satellites: General - Stars: Planetary Systems - stars: individual (GSC 02620-00648) - stars: individual (HAT-P-1) - stars: individual (XO-3)

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 17156b Pl 02 49 44.4866941172 +71 45 11.632197644           ~ 156 1
2 XO-3b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 170 1
3 XO-3 * 04 21 52.7044170433 +57 49 01.892074012   10.27 9.85     F5V 129 2
4 Ross 905b Pl 11 42 11.0932 +26 42 23.653           ~ 565 1
5 HD 147506b Pl 16 20 36.3579144486 +41 02 53.109043943           ~ 208 1
6 TrES-4 Pl 17 53 13.0490781575 +37 12 42.586106196           ~ 179 1
7 TYC 2620-648-1 * 17 53 13.0490781575 +37 12 42.586106196   12.112 11.592     F8 41 1
8 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1428 1
9 BD+37 4734A PM* 22 57 45.9210706356 +38 40 27.198337558   10.29 9.75     F8 15 0
10 HAT-P-1b Pl 22 57 46.8443014981 +38 40 30.355384717           ~ 192 1
11 BD+37 4734B PM* 22 57 46.8443014981 +38 40 30.355384717   10.82 9.87     G0V 142 1

    Equat.    Gal    SGal    Ecl

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2020.02.17-19:56:44

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