2012A&A...537A..54R


Query : 2012A&A...537A..54R

2012A&A...537A..54R - Astronomy and Astrophysics, volume 537A, 54-54 (2012/1-1)

Transiting exoplanets from the CoRoT space mission. XIX. CoRoT-23b: a dense hot Jupiter on an eccentric orbit.

ROUAN D., PARVIAINEN H., MOUTOU C., DELEUIL M., FRIDLUND M., OFIR A., HAVEL M., AIGRAIN S., ALONSO R., AUVERGNE M., BAGLIN A., BARGE P., BONOMO A.S., BORDE P., BOUCHY F., CABRERA J., CAVARROC C., CSIZMADIA Sz., DEEG H.J., DIAZ R.F., DVORAK R., ERIKSON A., FERRAZ-MELLO S., GANDOLFI D., GILLON M., GUILLOT T., HATZES A., HEBRARD G., JORDA L., LEGER A., LLEBARIA A., LAMMER H., LOVIS C., MAZEH T., OLLIVIER M., PAETZOLD M., QUELOZ D., RAUER H., SAMUEL B., SANTERNE A., SCHNEIDER J., TINGLEY B. and WUCHTERL G.

Abstract (from CDS):

We report the detection of CoRoT-23b, a hot Jupiter transiting in front of its host star with a period of 3.6314±0.0001-days. This planet was discovered thanks to photometric data secured with the CoRoT satellite, combined with spectroscopic radial velocity (RV) measurements. A photometric search for possible background eclipsing binaries conducted at CFHT and OGS concluded with a very low risk of false positives. The usual techniques of combining RV and transit data simultaneously were used to derive stellar and planetary parameters. The planet has a mass of Mp=2.8±0.3MJup, a radius of Rpl=1.05±0.13RJup, a density of ≃3g/cm3. RV data also clearly reveal a nonzero eccentricity of e=0.16±0.02. The planet orbits a mature G0 main sequence star of V=15.5mag, with a mass M*=1.14±0.08M, a radius R*=1.61±0.18R and quasi-solar abundances. The age of the system is evaluated to be 7Gyr, not far from the transition to subgiant, in agreement with the rather large stellar radius. The two features of a significant eccentricity of the orbit and of a fairly high density are fairly uncommon for a hot Jupiter. The high density is, however, consistent with a model of contraction of a planet at this mass, given the age of the system. On the other hand, at such an age, circularization is expected to be completed. In fact, we show that for this planetary mass and orbital distance, any initial eccentricity should not totally vanish after 7Gyr, as long as the tidal quality factor Qp is more than a few 105, a value that is the lower bound of the usually expected range. Even if CoRoT-23b features a density and an eccentricity that are atypical of a hot Jupiter, it is thus not an enigmatic object.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - techniques: photometric - stars: fundamental parameters - planetary systems - techniques: radial velocities

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CoRoT-20 * 06 30 52.9022402976 +00 13 36.858436428   15.41 14.66 14.60 13.69 ~ 20 2
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12913 0
3 CoRoT-23 * 18 39 07.8405328128 +04 21 28.034371188   16.0   15.70   ~ 11 1
4 CoRoT-23b Pl 18 39 07.8405532613 +04 21 28.034647444           ~ 20 1

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2022.05.26-15:50:05

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