Astronomy and Astrophysics, volume 545A, 55-55 (2012/9-1)
The SOPHIE search for northern extrasolar planets. V. Follow-up of ELODIE candidates: Jupiter-analogs around sun-like stars.
BOISSE I., PEPE F., PERRIER C., QUELOZ D., BONFILS X., BOUCHY F., SANTOS N.C., ARNOLD L., BEUZIT J.-L., DIAZ R.F., DELFOSSE X., EGGENBERGER A., EHRENREICH D., FORVEILLE T., HEBRARD G., LAGRANGE A.-M., LOVIS C., MAYOR M., MOUTOU C., NAEF D., SANTERNE A., SEGRANSAN D., SIVAN J.-P. and UDRY S.
Abstract (from CDS):
We present radial-velocity measurements obtained in one of a number of programs underway to search for extrasolar planets with the spectrograph SOPHIE at the 1.93-m telescope of the Haute-Provence Observatory. Targets were selected from catalogs observed with ELODIE, which had been mounted previously at the telescope, in order to detect long-period planets with an extended database close to 15 years. Two new Jupiter-analog candidates are reported to orbit the bright stars HD150706 and HD222155 in 16.1yr and 10.9yr at 6.7+4.0–1.4AU and 5.1+0.6–0.7AU, and to have minimum masses of 2.71+1.14–0.66MJup and 1.90+0.67–0.53MJup, respectively. Using the measurements from ELODIE and SOPHIE, we refine the parameters of the long-period planets HD154345b and HD89307b, and publish the first reliable orbit for HD24040b. This last companion has a minimum mass of 4.01±0.49MJup orbiting its star in 10.0yr at 4.92±0.38AU. Moreover, the data provide evidence of a third bound object in the HD24040 system. With a surrounding dust debris disk, HD150706 is an active G0 dwarf for which we partially corrected the effect of the stellar spot on the SOPHIE radial-velocities. In contrast, HD222155 is an inactive G2V star. In the SOPHIE measurements, an instrumental effect could be characterized and partly corrected. On the basis of the previous findings of Lovis and collaborators and since no significant correlation between the radial-velocity variations and the activity index are found in the SOPHIE data, these variations are not expected to be only due to stellar magnetic cycles. Finally, we discuss the main properties of this new population of long-period Jupiter-mass planets, which for the moment consists of fewer than 20 candidates. These stars are preferential targets either for direct-imaging or astrometry follow-up surveys to constrain the system parameters and for higher-precision radial-velocity searches for lower mass planets, aiming to find a solar system twin. In the Appendix, we determine the relation that defines the radial-velocity offset between the ELODIE and SOPHIE spectrographs.
techniques: radial velocities - planetary systems
VizieR on-line data:
<Available at CDS (J/A+A/545/A55): stars.dat tablea1.dat tablea2.dat tablea3.dat tablea4.dat tablea5.dat tablea6.dat tablea7.dat tablea8.dat tablea9.dat tablea10.dat>
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