EDP Sciences
Free access
Issue A&A
Volume 447, Number 3, March I 2006
Page(s) 1159 - 1163
Section Planets and planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20053720



A&A 447, 1159-1163 (2006)
DOI: 10.1051/0004-6361:20053720

The CORALIE survey for southern extrasolar planets

XIV. HD 142022 b: a long-period planetary companion in a wide binary
A. Eggenberger1, M. Mayor1, D. Naef2, F. Pepe1, D. Queloz1, N. C. Santos1, 3, S. Udry1 and C. Lovis1

1  Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
    e-mail: Anne.Eggenberger@obs.unige.ch
2  European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
3  Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal

(Received 29 June 2005 / Accepted 12 October 2005 )

Abstract
We report precise Doppler measurements of HD 142022 obtained during the past six years with the CORALIE echelle spectrograph at La Silla Observatory together with a few additional observations made recently with the HARPS echelle spectrograph. Our radial velocities reveal evidence of a planetary companion with an orbital period P=1928+53-39 days, an eccentricity e=0.53+0.23-0.18, and a velocity semiamplitude K=92+102-29 m s-1. The inferred companion minimum mass is $M_2\sin{i}=5.1^{+2.6}_{-1.5}~{M}_{\rm Jup}$ and the semimajor axis a=3.03 $\pm$ 0.05 AU. Only one full orbital revolution has been monitored yet, and the periastron passage could not be observed since the star was too low on the horizon. The eccentricity and velocity semiamplitude remain therefore quite uncertain and the orbital solution is preliminary. HD 142022 is a chromospherically inactive K0 dwarf, metal rich relative to the Sun, and is the primary component of a wide binary. HD 142022 b is thus a new "planet in binary" candidate, and its high eccentricity might be due to secular interactions with the distant stellar companion.


Key words: techniques: radial velocities -- stars: individual: HD 142022 -- stars: binaries: visual -- stars: planetary systems

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Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

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