2010A&A...511A..21C


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.04CEST23:16:07

2010A&A...511A..21C - Astronomy and Astrophysics, volume 511, A21-21 (2010/2-2)

The HARPS search for southern extra-solar planets. XIX. Characterization and dynamics of the GJ 876 planetary system.

CORREIA A.C.M., COUETDIC J., LASKAR J., BONFILS X., MAYOR M., BERTAUX J.-L., BOUCHY F., DELFOSSE X., FORVEILLE T., LOVIS C., PEPE F., PERRIER C., QUELOZ D. and UDRY S.

Abstract (from CDS):

Precise radial-velocity measurements for data acquired with the HARPS spectrograph infer that three planets orbit the M4 dwarf star GJ876. In particular, we confirm the existence of planet d, which orbits every 1.93785 days. We find that its orbit may have significant eccentricity (e=0.14), and deduce a more accurate estimate of its minimum mass of 6.3M. Dynamical modeling of the HARPS measurements combined with literature velocities from the Keck Observatory strongly constrain the orbital inclinations of the b and c planets. We find that ib=48.9°±1.0° and ic=48.1°±2.1°, which infers the true planet masses of Mb=2.64±0.04MJup and Mc=0.83±0.03MJup, respectively. Radial velocities alone, in this favorable case, can therefore fully determine the orbital architecture of a multi-planet system, without the input from astrometry or transits. The orbits of the two giant planets are nearly coplanar, and their 2:1 mean motion resonance ensures stability over at least 5Gyr. The libration amplitude is smaller than 2°, suggesting that it was damped by some dissipative process during planet formation. The system has space for a stable fourth planet in a 4:1 mean motion resonance with planet b, with a period around 15 days. The radial velocity measurements constrain the mass of this possible additional planet to be at most that of the Earth.

Abstract Copyright:

Journal keyword(s): stars: individual: GJ876 - planetary systems - techniques: radial velocities - methods: observational - methods: numerical - celestial mechanics

VizieR on-line data: <Available at CDS (J/A+A/511/A21): coralie.dat elodie.dat harps.dat>

Status at CDS:  

Simbad objects: 9

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Number of rows : 9

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 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1689 1
2 HD 45364 PM* 06 25 38.4744251424 -31 28 51.428476346   8.82 8.06     G8V 98 1
3 HD 60532 PM* 07 34 03.1802404179 -22 17 45.838378187 5.02 4.94 4.39     F6IV-V 198 1
4 PSR B1257+12 Psr 13 00 03.1075 +12 40 55.155           ~ 469 1
5 CD-46 11540 PM* 17 28 39.9455601300 -46 53 42.693246243 12.177 10.973 9.407 8.337 7.006 M3V 204 1
6 HD 202206 PM* 21 14 57.7684954746 -20 47 21.162361638   8.79 8.07     G6V 192 1
7 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 854 1
8 BD-15 6290b Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 219 1
9 BD-15 6290d Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 134 1

    Equat.    Gal    SGal    Ecl

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2020.06.04-23:16:07

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