2008ApJ...685..543J


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST11:19:13

2008ApJ...685..543J - Astrophys. J., 685, 543-552 (2008/September-3)

Observability of the general relativistic precession of periastra in exoplanets.

JORDAN A. and BAKOS G.A.

Abstract (from CDS):

The general relativistic precession rate of periastra in close-in exoplanets can be orders of magnitude larger than the magnitude of the same effect for Mercury. The realization that some of the close-in exoplanets have significant eccentricities raises the possibility that this precession might be detectable. We explore in this work the observability of the periastron precession using radial velocity and transit light curve observations. Our analysis is independent of the source of precession, which can also have significant contributions due to additional planets and tidal deformations. We find that precession of the periastra of the magnitude expected from general relativity can be detectable in timescales of ≲10 yr with current observational capabilities by measuring the change in the primary transit duration or in the time difference between primary and secondary transits. Radial velocity curves alone would be able to detect this precession for supermassive, close-in exoplanets orbiting inactive stars if they have ∼100 data points at each of two epochs separated by ∼20 yr. We show that the contribution to the precession by tidal deformations may dominate the total precession in cases where the relativistic precession is detectable. Studies of transit durations with Kepler might need to take into account effects arising from the general relativistic and tidal induced precession of periastra for systems containing close-in, eccentric exoplanets. Such studies may be able to detect additional planets with masses comparable to that of Earth by detecting secular variations in the transit duration induced by the changing longitude of periastron.

Abstract Copyright:

Journal keyword(s): Celestial Mechanics - Stars: Planetary Systems

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 XO-3 * 04 21 52.7044170433 +57 49 01.892074012   10.27 9.85     F5V 128 2
2 XO-3b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 167 1
3 HD 49674b Pl 06 51 30.5163382954 +40 52 03.925594792           ~ 45 1
4 HD 83443 PM* 09 37 11.8276134249 -43 16 19.932615823   9.03 8.24     K0/1V+G(III) 193 1
5 HD 88133b Pl 10 10 07.6764175090 +18 11 12.732169082           ~ 37 1
6 Ross 905b Pl 11 42 11.0932 +26 42 23.653           ~ 545 1
7 * 70 Vir b Pl 13 28 25.8086 +13 46 43.637           ~ 102 1
8 HD 118203b Pl 13 34 02.5394311294 +53 43 42.698368523           ~ 32 1
9 * tau Boo b Pl 13 47 15.74340 +17 27 24.8552           ~ 228 1
10 HD 147506b Pl 16 20 36.3579144486 +41 02 53.109043943           ~ 204 1
11 HD 185269b Pl 19 37 11.7410773820 +28 29 59.502459125           ~ 29 1
12 V* V376 Peg EP* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 968 1
13 * 51 Peg ** 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1055 1

    Equat.    Gal    SGal    Ecl

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2019.10.14-11:19:13

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