The California Legacy Survey III. On The Shoulders of (Some) Giants: The Relationship between Inner Small Planets and Outer Massive Planets

Abstract

We use a high-precision radial velocity survey of FGKM stars to study the conditional occurrence of two classes of planets: close-in small planets (0.023--1 au, 2--30 Earth masses) and distant giant planets (0.23--10 au, 30--6000 Earth masses). We find that $41_{-13}^{+15}\%$ of systems with a close-in, small planet also host an outer giant, compared to $17.6_{-1.9}^{+2.4}\%$ for stars irrespective of small planet presence. This implies that small planet hosts may be enhanced in outer giant occurrence compared to all stars with $1.7\sigma$ significance. Conversely, we estimate that $42_{-13}^{+17}\%$ of cold giant hosts also host an inner small planet, compared to $27.6_{-4.8}^{+5.8}\%$ of stars irrespective of cold giant presence. We also find that more massive and close-in giant planets are not associated with small inner planets. Specifically, our sample indicates that small planets are less likely to host outer giant companions more massive than approximately 120 Earth masses and within 0.3--3 au than to host less massive or more distant giant companions, with $\sim$2.2$\sigma$ confidence. This implies that massive gas giants within 0.3--3 au may suppress inner small planet formation. Additionally, we compare the host-star metallicity distributions for systems with only small planets and those with both small planets and cold giants. In agreement with previous studies, we find that stars in our survey that only host small planets have a metallicity distribution that is consistent with the broader solar-metallicity-median sample, while stars that host both small planets and gas giants are distinctly metal-rich with $\sim$2.3$\sigma$ confidence.

arXiv commentReposted on arxiv after journal acceptance and alterations in response to reviewer comments

References in corpus (66)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• The Transiting Exoplanet Survey Satellite
• Planet Occurrence within 0.25 AU of Solar-type Stars from Kepler
• Catalog of Nearby Exoplanets
• The Keck Planet Search: Detectability and the Minimum Mass and Orbital Period Distribution of Extrasolar Planets
• Prevalence of Earth-size planets orbiting Sun-like stars
• Planet-disk interaction and orbital evolution
• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• RadVel: The Radial Velocity Modeling Toolkit
• A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436
• Accurate, Empirical Radii and Masses of Planets and their Host Stars with Gaia Parallaxes
• False positive probabilties for all Kepler Objects of Interest: 1284 newly validated planets and 428 likely false positives
• The California Planet Survey I. Four New Giant Exoplanets
• The HARPS search for southern extra-solar planets XVIII. An Earth-mass planet in the GJ 581 planetary system
• An extrasolar planetary system with three Neptune-mass planets
• The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets
• Three regimes of extrasolar planets inferred from host star metallicities
• Parametrizing the exoplanet eccentricity distribution with the Beta distribution
• The NASA-UC-UH Eta-Earth Program: IV. A Low-mass Planet Orbiting an M Dwarf 3.6 PC from Earth
• Models of Jupiter's Growth Incorporating Thermal and Hydrodynamic Constraints
• Exoplanet population inference and the abundance of Earth analogs from noisy, incomplete catalogs
• Architecture of Planetary Systems Based on Kepler Data: Number of Planets and Coplanarity
• The HARPS search for southern extra-solar planets. VI. A Neptune-mass planet around the nearby M dwarf Gl 581
• Warm Jupiters are less lonely than hot Jupiters: close neighbours
• Transit Timing Observations from Kepler. IX. Catalog of the Full Long-Cadence Data Set
• An Excess of Jupiter Analogs in Super-Earth Systems
• The Super Earth-Cold Jupiter Relations
• Formation of TRAPPIST-1 and other compact systems
• Impact of Binary Stars on Planet Statistics -- I. Planet Occurrence Rates, Trends with Stellar Mass, and Wide Companions to Hot Jupiter Hosts
• The Twenty-Five Year Lick Planet Search
• Architectures of Exoplanetary Systems. I: A Clustered Forward Model for Exoplanetary Systems around Kepler's FGK Stars
• The HARPS search for southern extra-solar planets: XIV. Gl 176b, a super-Earth rather than a Neptune, and at a different period
• The HARPS search for southern extra-solar planets. XXXVIII. Bayesian re-analysis of three systems. New super-Earths, unconfirmed signals, and magnetic cycles
• A Super-Earth and two Neptunes Orbiting the Nearby Sun-like star 61 Virginis
• The Anglo-Australian Planet Search XXIV: The Frequency of Jupiter Analogs
• The Origin of Planetary System Architectures. I. Multiple Planet Traps in Gaseous Discs
• The HARPS search for southern extra-solar planets. XVII. Super-Earth and Neptune-mass planets in multiple planet systems HD47186 and HD181433
• A hot Jupiter orbiting the 1.7 Msun Subgiant HD102956
• Architectures of Exoplanetary Systems. III: Eccentricity and Mutual Inclination Distributions of AMD-stable Planetary Systems
• The New Generation Planetary Population Synthesis (NGPPS). III. Warm super-Earths and cold Jupiters: A weak occurrence correlation, but with a strong architecture-composition link
• An Empirically Derived Three-Dimensional Laplace Resonance in the Gliese 876 Planetary System
• Resonant capture by inward migrating planets
• A Six-Planet System Orbiting HD 219134
• The HARPS search for southern extra-solar planets. XXXVI. Eight HARPS multi-planet systems hosting 20 super-Earth and Neptune-mass companions
• Three Super-Earths Orbiting HD 7924
• The NASA-UC Eta-Earth Program: II. A Planet Orbiting HD 156668 with a Minimum Mass of Four Earth Masses
• The CARMENES search for exoplanets around M dwarfs - HD 147379b: A nearby Neptune in the temperate zone of an early-M dwarf
• The ELODIE survey for northern extra-solar planets II. A Jovian planet on a long-period orbit around GJ 777 A
• A Joint Mass-Radius-Period Distribution of Exoplanets
• The eccentricity distribution of giant planets and their relation to super-Earths in the pebble accretion scenario
• The SOPHIE search for northern extrasolar planets. XIV. A temperate ($T_{\mathrm{eq}}\sim 300$ K) super-earth around the nearby star Gliese 411
• A Transiting Jupiter Analog
• The Lick-Carnegie Exoplanet Survey: HD32963 -- A New Jupiter Analog Orbiting a Sun-like Star
• A Super-Earth Orbiting the Nearby Sun-like Star HD 1461
• Three Temperate Neptunes Orbiting Nearby Stars
• The Lick-Carnegie Exoplanet Survey: Gliese 687b: A Neptune-Mass Planet Orbiting a Nearby Red Dwarf
• Kepler-167e as a Probe of the Formation Histories of Cold Giants with Inner Super-Earths
• Building massive compact planetesimal disks from the accretion of pebbles
• Super-Earths and sub-Neptunes are Insensitive to Stellar Metallicity
• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. I. Confirmation of an Eccentric, Cool Jupiter With an Interior Earth-sized Planet Orbiting Kepler-1514
• Two Planets Straddling the Habitable Zone of The Nearby K Dwarf Gl 414A
• A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
• The California Legacy Survey II. Occurrence of Giant Planets Beyond the Ice line
• The California Legacy Survey I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades