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Nearby stars are prime targets for exoplanet searches and characterization using a variety of detection techniques. Combining constraints from the complementary detection methods of high contrast imaging (HCI) and radial velocity (RV) can…

Earth and Planetary Astrophysics · Physics 2019-09-25 A. Boehle , S. P. Quanz , C. Lovis , D. Sègransan , S. Udry , D. Apai

We combine absolute astrometry from Hipparcos and Gaia with archival radial velocities from the Keck/HIRES and ESO/HARPS spectrographs, as well as relative astrometry (when available), to derive masses and orbits for 156 companions around…

Earth and Planetary Astrophysics · Physics 2025-08-13 Qier An , Timothy D. Brandt , G. Mirek Brandt , Alexander Venner

We report the discovery of long-period radial velocity (RV) variations in six intermediate-mass K-giant stars using precise RV measurements. These discoveries are part of the Search for Exoplanets around Northern Circumpolar Stars (SENS)…

Earth and Planetary Astrophysics · Physics 2018-08-06 Gwanghui Jeong , Inwoo Han , Myeong-Gu Park , Artie P. Hatzes , Tae-Yang Bang , Shenghong Gu , Jinming Bai , Byeong-Cheol Lee

Aims. With an observing time span of more than 20 years, the CORALIE radial-velocity survey is able to detect long-term trends in data corresponding to companions with masses and separations accessible to direct imaging. Combining exoplanet…

Earth and Planetary Astrophysics · Physics 2022-12-26 E. L. Rickman , E. Matthews , W. Ceva , D. Ségransan , G. M. Brandt , H. Zhang , T. D. Brandt , T. Forveille , J. Hagelberg , S. Udry

The companion to the G0V star HR7672 directly imaged by Liu et al. (2002) has moved measurably along its orbit since the discovery epoch, making it possible to determine its dynamical properties. Originally targeted with adaptive optics…

Precise radial velocity (RV) measurements are a crucial tool for exoplanet discovery and characterization. Today, the majority of these measurements are derived from Echelle spectra in the optical wavelength region using cross-correlation…

The upcoming release of $Gaia$ DR4 will yield thousands of giant planet candidates, eventually enabling studies of giant planet eccentricities, masses, and occurrence rates across a broad range of stellar host masses, metallicities, and…

The census of planets around M dwarfs in the solar neighbourhood meets two challenges: detecting the best targets for the future characterisation of planets with ELTs, and studying the statistics of planet occurrence that are crucial to…

The population of long-period giant planets shapes planetary system architectures and formation pathways, but these cold Jupiters remain relatively unexplored. Radial velocity (RV) surveys lose sensitivity at multi-AU separations, while…

Radial velocity (RV) searches for exoplanets have surveyed many of the nearest and brightest stars for long-term velocity variations indicative of a companion body. Such surveys often detect high-amplitude velocity signatures of objects…

Context. Certain periodic variations of radial velocities (RV) of wobbling giants originate from exoplanets. Indeed, a number of exoplanets have been discovered around giant stars. Aims. The purpose of our study is to find low-amplitude and…

Aims. The purpose of this paper is to detect and investigate the nature of long-term radial velocity (RV) variations of K-type giants and to confirm planetary companions around the stars. Methods. We have conducted two planet search…

Earth and Planetary Astrophysics · Physics 2018-02-21 Gwanghui Jeong , Byeong-Cheol Lee , Inwoo Han , Masashi Omiya , Hideyuki Izumiura , Bun'ei Sato , Eiji Kambe , Hiroki Harakawa , David Mkrtchian

Given that secular perturbations in a binary system not only excite high orbital eccentricities but also alter the planetary orbital inclination, the classical Keplerian orbital model is no longer applicable for orbital retrieval. The…

Earth and Planetary Astrophysics · Physics 2025-03-24 Xiumin Huang , Jianghui Ji , Chunhui Bao , Dongjie Tan , Su Wang , Yao Dong , Guo Chen

High-contrast medium resolution spectroscopy has been used to detect molecules such as water and carbon monoxide in the atmospheres of gas giant exoplanets. In this work, we show how it can be used to derive radial velocity (RV)…

We present new, high-precision Doppler radial velocity (RV) data sets for the nearby K3V star HD 219134. The data include 175 velocities obtained with the HIRES Spectrograph at the Keck I Telescope, and 101 velocities obtained with the Levy…

Aims. We report the detection of long-period radial velocity (RV) variations in three giant stars, HD 19615, HD 150010, and HD 174205, using precise RV measurements. Methods. These detections are part of the Search for Exoplanets around…

Earth and Planetary Astrophysics · Physics 2022-06-01 G. Jeong , B. C. Lee , M. G. Park , T. Y. Bang , I. Han

For the past 3 years we have been monitoring 62 K giant stars using precise stellar radial velocity (RV) measurements with the 2m Alfred Jensch telescope of the Th\"uringer Landessternwarte Tautenburg (TLS). To probe the dependence of…

Earth and Planetary Astrophysics · Physics 2015-05-13 M. P. Doellinger , A. P. Hatzes , L. Pasquini , E. W. Guenther , M. Hartmann , L. Girardi

Giant planets on long period orbits around the nearest stars are among the easiest to directly image. Unfortunately these planets are difficult to fully constrain by indirect methods, e.g., transit and radial velocity (RV). In this study,…

The detection and constraint of the orbits of long-period giant planets is essential for enabling their further study through direct imaging. Recently, it has been highlighted that there are discrepancies between different orbital fitting…

Earth and Planetary Astrophysics · Physics 2025-04-28 Fabo Feng , Guang-Yao Xiao , Hugh R. A. Jones , James S. Jenkins , Pablo Pena , Qinghui Sun

Based on two decades of radial velocity (RV) observations using Keck/HIRES and McDonald/Tull, and more recent observations using the Automated Planet Finder, we found that the nearby star HR 5183 (HD 120066) hosts a 3$M_J$ minimum mass…