The California Legacy Survey III. On The Shoulders of (Some) Giants: The Relationship between Inner Small Planets and Outer Massive Planets
Lee J. Rosenthal, Heather A. Knutson, Yayaati Chachan, Fei Dai, Andrew, W. Howard, Benjamin J. Fulton, Ashley Chontos, Justin R. Crepp, Paul A., Dalba, Gregory W. Henry, Stephen R. Kane, Erik A. Petigura, Lauren M. Weiss,, Jason T. Wright

TL;DR
This study uses high-precision radial velocity data to explore the relationship between inner small planets and outer giant planets, revealing correlations with host star metallicity and potential suppression of small planets by massive giants.
Contribution
It provides new statistical evidence on how the presence of outer giants influences inner small planet occurrence and host star metallicity, using a high-precision survey.
Findings
Small planets are more common around stars with outer giants.
Stars with both small planets and giants tend to be metal-rich.
Massive outer giants (>120 Earth masses) may suppress inner small planet formation.
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 of systems with a close-in, small planet also host an outer giant, compared to 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 significance. Conversely, we estimate that of cold giant hosts also host an inner small planet, compared to 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…
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