A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
Jennifer A. Burt, Fabo Feng, Bradford Holden, Eric E. Mamajek, Chelsea, X. Huang, Mickey M. Rosenthal, Songhu Wang, R. Paul Butler, Steven S. Vogt,, Gregory Laughlin, Gregory W. Henry, Johanna K. Teske, Sharon W. Wang, Jeffrey, D. Crane, Steve A. Shectman

TL;DR
This study reports the discovery of three new super-Earth and sub-Neptune exoplanets orbiting nearby K dwarfs using precision radial velocity measurements, and updates models for previously known planets, contributing to the understanding of small planet populations.
Contribution
The paper presents new exoplanet discoveries around K dwarfs and refines orbital models, expanding the catalog of small planets in the super-Earth and sub-Neptune regime.
Findings
Discovered three new exoplanets with detailed orbital parameters.
Updated orbital models for previously known planets GJ 686 b and HD 180617 b.
Found that the new planets are unlikely to have additional companions within certain mass and period ranges.
Abstract
Analysis of new precision radial velocity (RV) measurements from the Lick Automated Planet Finder (APF) and Keck HIRES have yielded the discovery of three new exoplanet candidates orbiting two nearby K dwarfs not previously reported to have companions (HD 190007 & HD 216520). We also report new velocities from both the APF and the Planet Finder Spectrograph (PFS) for the previously reported planet host stars GJ 686 and HD 180617 and update the corresponding exoplanet orbital models. Of the newly discovered planets, HD 190007 b has a period of 11.72 days, an RV semi-amplitude of K = 5.640.55 m s, a minimum mass of 16.461.66 , and orbits the slightly metal-rich, active K4 dwarf star HD 190007 (d = 12.7 pc). HD 216520 b has an orbital period of 35.45 days, an RV semi-amplitude of K = 2.280.20 m s, and a minimum mass of 10.260.99 $\rm…
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