A Six-Planet System Orbiting HD 219134
Steven S. Vogt, Jennifer Burt, Stefano Meschiari, R. Paul Butler,, Gregory W. Henry, Songhu Wang, Brad Holden, Cyril Gapp, Russell Hanson,, Pamela Arriagada, Sandy Keiser, Johanna Teske, Gregory Laughlin

TL;DR
This paper reports the discovery of six new exoplanets orbiting HD 219134 using high-precision radial velocity measurements, with strong evidence supporting their planetary nature and potential for detailed follow-up observations.
Contribution
First detection of six new planets around HD 219134 using combined Doppler data and photometry, demonstrating the system's suitability for detailed study.
Findings
Six new planetary candidates with well-defined orbits and masses.
Outermost signal unlikely to be stellar activity artifact.
Photometry shows no brightness variability, supporting planetary origin.
Abstract
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 Spectrograph at the Automated Planet Finder Telescope (APF) at Lick Observatory. Our observations reveal six new planetary candidates, with orbital periods of P=3.1, 6.8, 22.8, 46.7, 94.2 and 2247 days, spanning masses of msini=3.8, 3.5, 8.9, 21.3, 10.8 and 108 M_earth respectively. Our analysis indicates that the outermost signal is unlikely to be an artifact induced by stellar activity. In addition, several years of precision photometry with the T10 0.8~m automatic photometric telescope (APT) at Fairborn Observatory demonstrated a lack of brightness variability to a limit of ~0.0002 mag, providing strong support for planetary-reflex motion as the…
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