2000ApJ...534L..97B


Query : 2000ApJ...534L..97B

2000ApJ...534L..97B - Astrophys. J., 534, L97-L100 (2000/May-1)

On the radii of close-in giant planets.

BURROWS A., GUILLOT T., HUBBARD W.B., MARLEY M.S., SAUMON D., LUNINE J.I. and SUDARSKY D.

Abstract (from CDS):

The recent discovery that the close-in extrasolar giant planet HD 209458b transits its star has provided a first-of-its-kind measurement of the planet's radius and mass. In addition, there is a provocative detection of the light reflected off of the giant planet τ Bootis b. Including the effects of stellar irradiation, we estimate the general behavior of radius/age trajectories for such planets and interpret the large measured radii of HD 209458b and τ Boo b in that context. We find that HD 209458b must be a hydrogen-rich gas giant. Furthermore, the large radius of a close-in gas giant is not due to the thermal expansion of its atmosphere but to the high residual entropy that remains throughout its bulk by dint of its early proximity to a luminous primary. The large stellar flux does not inflate the planet but retards its otherwise inexorable contraction from a more extended configuration at birth. This implies either that such a planet was formed near its current orbital distance or that it migrated in from larger distances (≥0.5 AU), no later than a few times 107 yr of birth.

Abstract Copyright:

Journal keyword(s): Stars: Planetary Systems - Planets and Satellites: General - Stars: Individual: Henry Draper Number: HD 209458 - Stars: Individual: Constellation Name: τ Bootis

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * ups And b Pl 01 36 47.84216 +41 24 19.6443           ~ 254 1
2 * ups And PM* 01 36 47.84216 +41 24 19.6443 4.70 4.64 4.10 3.64 3.35 F9V 908 1
3 HD 75289 PM* 08 47 40.3895634256 -41 44 12.456269569 7.04 6.94 6.36     F9VFe+0.3 258 1
4 HD 75289b Pl 08 47 40.3895634256 -41 44 12.456269569           ~ 82 1
5 * tau Boo b Pl 13 47 15.74340 +17 27 24.8552           ~ 248 1
6 * tau Boo Ro* 13 47 15.74340 +17 27 24.8552 5.02 4.98 4.49 4.09 3.85 F7IV-V 915 1
7 * sig Boo PM* 14 34 40.8171808483 +29 44 42.463685978 4.76 4.84 4.47 4.13 3.94 F4VkF2mF1 582 0
8 HD 187123b Pl 19 46 58.1122608389 +34 25 10.279867125           ~ 78 1
9 HD 187123 PM* 19 46 58.1122608389 +34 25 10.279867125       7.4   G2V 225 1
10 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1595 1
11 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 1025 1
12 * 51 Peg PM* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1098 1
13 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 571 1
14 HD 217107b Pl 22 58 15.5411942071 -02 23 43.387117210           ~ 85 1
15 HD 217107 ** 22 58 15.5411942071 -02 23 43.387117210   6.919 6.163     G8IV/V 344 1

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2021.09.26-05:14:40

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