The ELODIE survey for northern extra-solar planets III. Three planetary candidates detected with ELODIE

TL;DR

This paper reports the detection of three planetary candidates around stars HD 74156 and HD 145675 using ELODIE radial-velocity measurements, including detailed orbital parameters and confirmation of known exoplanets.

Contribution

First detection of multiple planetary companions around HD 74156 and HD 145675 using ELODIE, with updated orbital solutions for several known exoplanets.

Findings

HD 74156 hosts two planets with eccentric orbits.

HD 145675 has a long-period, moderately eccentric planetary companion.

Confirmed orbital solutions for several known exoplanets.

Abstract

We present our ELODIE radial-velocity measurements of HD 74156 and 14 Her (HD 145675). These stars exhibit low-amplitude radial-velocity variations induced by the presence of low-mass companions. The radial-velocity data of HD 74156 reveal the presence of two planetary companions: a 1.86 M_Jup planet on a 51.64--d orbit and a 6.2 M_Jup planet on a long-period (5.5 yr) orbit. Both orbits are fairly eccentric (e=0.64 and 0.58). The 4.7M_Jup companion to HD 145675 has a long period (4.9 yr) and a moderately eccentric orbit (e=0.34). We detect an additional linear radial-velocity trend superimposed to the periodic signal for this star. We also compute updated orbital solutions for HD 209458 and 51 Peg (HD 217014). Finally, we present our ELODIE radial-velocity data and orbital solutions for 5 stars known to host planetary companions: Ups And (HD 9826), 55 Cnc (HD 75732), 47 UMa (HD 95128), 70Vir (HD 117176) and HD 187123. We confirm the previously published orbital solutions for Ups And, 70 Vir and HD 187123. Our data are not sufficient for fully confirming the orbital solutions for 55 Cnc and 47UMa.