2005A&A...431.1129H


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.24CET10:24:21

2005A&A...431.1129H - Astronomy and Astrophysics, volume 431, 1129-1137 (2005/3-1)

Statistical properties of exoplanets. IV. The period-eccentricity relations of exoplanets and of binary stars.

HALBWACHS J.L., MAYOR M. and UDRY S.

Abstract (from CDS):

A sample of spectroscopic binaries and a sample of single planetary systems, both having main-sequence solar-type primary components, are selected in order to compare their eccentricities. The positions of the objects in the (P.(1-e2)3/2, e) plane is used to determine parts in the period-eccentricity diagram that are not affected by tidal circularization. The original eccentricities of binaries and planets are derived and compared. They seem to be weakly or not at all correlated with period in both samples, but two major differences are found: (1) The tidal circularization of planetary orbits is almost complete for periods shorter than 5 days, but it is not visible when P.(1-e2)3/2 is longer than this limit. This suggests that the circularization occurs rapidly after the end of the migration process and is probably simultaneous with the end of the formation of the planet. By contrast, we confirm that the circularization of the binary orbits is a process still progressing a long time after the formation of the systems. (2) Beyond the circularization limit, the eccentricities of the orbits of the planets are significantly smaller than those of binary orbits, and this discrepancy cannot be due to a selection effect. Moreover, the eccentricities of binaries with small mass ratios are quite similar to those of all binaries with q<0.8. This suggests that the low eccentricities of exoplanet orbits are not a consequence of low-mass secondaries in a universal process. These remarks are in favor of the idea that binaries and exoplanets are two different classes of object from the point of view of their formation.

Abstract Copyright:

Journal keyword(s): stars: binaries: general - stars: binaries: spectroscopic - stars: planetary systems - stars: planetary systems: formation

Simbad objects: 5

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Number of rows : 5

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 45088 BY* 06 26 10.2539732357 +18 45 24.784795160 8.402 7.74   6.2   K2Ve 226 0
2 BD+19 2061 Ro* 08 39 24.9776901053 +19 27 33.643518853   11.066 10.461     F7V 54 0
3 HD 80606b Pl 09 22 37.5769478105 +50 36 13.434928660           ~ 267 1
4 HD 80606 PM* 09 22 37.5769478105 +50 36 13.434928660   9.78 9.00     G5 285 2
5 V* BY Dra BY* 18 33 55.7719224141 +51 43 08.903033617 10.22 9.23   8.733   K4Ve+K7.5Ve 592 0

    Equat.    Gal    SGal    Ecl

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2020.01.24-10:24:21

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