Astronomy and Astrophysics, volume 390, 267-279 (2002/7-4)
The CORALIE survey for southern extra-solar planets. VIII. The very low-mass companions of HD 141937, HD 162020, HD 168443 and HD 202206: Brown dwarfs or ``superplanets''?
UDRY S., MAYOR M., NAEF D., PEPE F., QUELOZ D., SANTOS N.C. and BURNET M.
Abstract (from CDS):
Doppler CORALIE measurements of the solar-type stars HD 141937
, HD 162020
, HD 168443
and HD 202206
show Keplerian radial-velocity variations revealing the presence of 4 new companions with minimum masses close to the planet/brown-dwarf transition, namely with m2
sini=9.7, 14.4, 16.9, and 17.5MJup
, respectively. The orbits present fairly large eccentricities (0.22≤e≤0.43). Except for HD 162020
, the parent stars are metal rich compared to the Sun, as are most of the detected extra-solar planet hosts. Considerations of tidal dissipation in the short-period HD 162020
system points towards a brown-dwarf nature for the low-mass companion. HD 168443
is a multiple system with two low-mass companions being either brown dwarfs or formed simultaneously in the protoplanetary disks as superplanets. For HD 202206
, the radial velocities show an additional drift revealing a further outer companion, the nature of which is still unknown. Finally, the stellar-host and orbital properties of massive planets are examined in comparison to lighter exoplanets. Observed trends include the need of metal-rich stars to form massive exoplanets and the lack of short periods for massive planets. If confirmed with improved statistics, these features may provide constraints for the migration scenario.
techniques: radial velocities - stars: binaries: spectroscopic - stars: individual: HD 141937 - stars: individual: HD 162020 - stars: individual: HD 168443 - stars: individual: HD 202206
VizieR on-line data:
<Available at CDS (J/A+A/390/267): hd141937.dat hd162020.dat hd168443.dat hd202206.dat>
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