NDLI: 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”?

Content Provider	EDP Sciences
Author	S. Udry M. Mayor D. Naef F. Pepe D. Queloz N. C. Santos M. Burnet
Abstract	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 9.7, 14.4, 16.9, and 17.5 M_{Jup_{, respectively. The orbits present fairly large eccentricities (). 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.}}
Ending Page	279
Starting Page	267
Page Count	13
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2002/28/aa2416/aa2416.html
e-ISSN	14320746
Issue Number	1
Journal	Astronomy & Astrophysics
Volume Number	390
DOI	10.1051/0004-6361:20020685
Language	English
Publisher	EDP Sciences
Publisher Date	2002-07-01
Access Restriction	Open
Rights Holder	© ESO, 2002
Subject Keyword	techniques: radial velocities stars: binaries: spectroscopic stars: individual: HD 141937 stars: individual: HD 162020 stars: individual: HD 168443 stars: individual: HD 202206 techniques: radial velocities / stars: binaries: spectroscopic / stars: individual: HD 141937 / stars: individual: HD 162020 / stars: individual: HD 168443 / stars: individual: HD 202206
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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