The SOPHIE search for northern extrasolar planets. X. Detection and characterization of giant planets by the dozen

TL;DR

This paper reports the discovery and characterization of multiple new giant exoplanets around eight stars using the SOPHIE spectrograph, including multi-planet systems and planets in habitable zones, enhancing our understanding of planetary systems.

Contribution

The study presents new radial velocity data leading to the detection of several giant exoplanets and provides detailed orbital and dynamical analyses, including multi-planet systems and planets in habitable zones.

Findings

Discovered multiple new giant exoplanets around eight stars.

Identified two multi-planet systems with detailed orbital parameters.

Found planets in habitable zones, including a hot Jupiter around a bright star.

Abstract

We present new radial velocity measurements of eight stars secured with the spectrograph SOPHIE at the 193-cm telescope of the Haute-Provence Observatory allowing the detection and characterization of new giant extrasolar planets. The host stars are dwarfs of spectral types between F5 and K0 and magnitudes between 6.7 and 9.6; the planets have minimum masses M_p sin i between 0.4 to 3.8 M_Jup and orbital periods of several days to several months. The data allow only single planets to be discovered around the first six stars (HD143105, HIP109600, HD35759, HIP109384, HD220842, and HD12484), but one of them shows the signature of an additional substellar companion in the system. The seventh star, HIP65407, allows the discovery of two giant planets, just outside the 12:5 resonance in weak mutual interaction. The last star, HD141399, was already known to host a four-planetary system; our additional data and analyses allow new constraints to be put on it. We present Keplerian orbits of all systems, together with dynamical analyses of the two multi-planetary systems. HD143105 is one of the brightest stars known to host a hot Jupiter, which could allow numerous follow-up studies to be conducted despite this is not a transiting system. The giant planets HIP109600b, HIP109384b, and HD141399c are located in the habitable zone of their host star.