65 citations · 159 across the 22 of their papers we have counts for
23 papers
The KPF-SLOPE Survey - Small, Compact Multi-Planet Systems Appear Spin-Orbit Aligned
Luke B. Handley, Andrew W. Howard, Fei Dai +16
The angle between stellar spin axes and planetary orbits -- stellar obliquity -- probes the dynamics of planetary migration and evolution. The obliquities of giant planets have bee…
No strong associations between eccentricity and orbital architecture in Kepler compact multis
Gregory J. Gilbert, Erik A. Petigura, Paige M. Entrican
The dynamical history of a planetary system is recorded in the present day architecture of its constituent planets' sizes, orbital periods, and eccentricities. Studying the relatio…
Planetary Architectures of Kepler Compact Multis with Binary Star Companions
Kendall Sullivan, Gregory J. Gilbert
Planets in binary-star systems exhibit demographic differences compared to planets in single-star systems. In particular, planets with binary-star hosts have a lower overall occurr…
The Transition from Giant Planets to Brown Dwarfs beyond 1 au from the Stellar Metallicity Distribution
Steven Giacalone, Andrew W. Howard, Gregory J. Gilbert +3
Giant planets and brown dwarfs are thought to form via a combination of pathways, including bottom-up mechanisms in which gas is accreted onto a solid core and top-down mechanisms…
Orbital Eccentricities Suggest a Gradual Transition from Giant Planets to Brown Dwarfs
Gregory J. Gilbert, Judah Van Zandt, Erik A. Petigura +3
To date, hundreds of sub-stellar objects with masses between have been detected orbiting main-sequence stars. The current convention uses the deuterium-burning…
A Smooth Transition from Giant Planets to Brown Dwarfs from the Radial Occurrence Distribution
Judah Van Zandt, Greg Gilbert, Steven Giacalone +3
Measuring the occurrence rates of celestial objects is a valuable way to study their origins and evolution. Giant planets and brown dwarfs produce large Doppler signatures that are…
The KPF SURFS-UP Survey I: Transmission Spectroscopy of WASP-76 b
Aaron Householder, Fei Dai, Aurora Kesseli +25
We introduce the KPF SURFS-UP (Spectroscopy of the Upper-atmospheres and ReFractory Species in Ultra-hot Planets) Survey, a high-resolution survey to investigate the atmospheric co…
The Orbital Eccentricities of Planets in the Kinematic Thin and Thick Galactic Disks
Sheila Sagear, Sarah Ballard, Kathryne J. Daniel +4
The orbital eccentricity distribution of exoplanets is shaped by a combination of dynamical processes, reflecting both formation conditions and long-term evolution. Probing the orb…
A Decade of Transit-Timing Measurements Confirm Resonance in the K2-19 System
Paige M. Entrican, Erik A. Petigura, Antoine C. Petit +2
K2-19 is a star, slightly smaller than the Sun, that hosts three transiting planets. Two of these, K2-19 b and c, are between the size of Neptune and Saturn and have orbital period…
Planets larger than Neptune have elevated eccentricities
Gregory J. Gilbert, Erik A. Petigura, Paige M. Entrican
NASA's Kepler mission identified over 4000 extrasolar planets that transit (cross in front of) their host stars. This sample has revealed detailed features in the demographics of p…
The Orbital Eccentricity-Radius Relation for Planets Orbiting M Dwarfs
Sheila Sagear, Sarah Ballard, Gregory J. Gilbert +2
The orbital eccentricity-radius relation for small planets is indicative of the predominant dynamical sculpting processes during late-stage orbital evolution. Previous studies have…
TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf
Rena A. Lee, Fei Dai, Andrew W. Howard +71
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 0.041 R) ultra-short-period (USP) planet orbiting a nearby (20 pc) M dwarf. Using the newly com…
The TESS-Keck Survey XXIV: Outer Giants may be More Prevalent in the Presence of Inner Small Planets
Judah Van Zandt, Erik A. Petigura, Jack Lubin +38
We present the results of the Distant Giants Survey, a three-year radial velocity (RV) campaign to search for wide-separation giant planets orbiting Sun-like stars known to host an…
The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like
Casey L. Brinkman, Lauren M. Weiss, Daniel Huber +54
Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear…
An Earth-sized Planet on the Verge of Tidal Disruption
Fei Dai, Andrew W. Howard, Samuel Halverson +95
TOI-6255~b (GJ 4256) is an Earth-sized planet (1.079 ) with an orbital period of only 5.7 hours. With the newly commissioned Keck Planet Finder (KPF) and CARMEN…
The Prevalence of Resonance Among Young, Close-in Planets
Fei Dai, Max Goldberg, Konstantin Batygin +11
Multiple planets undergoing disk migration may be captured into a chain of mean-motion resonances with the innermost planet parked near the disk's inner edge. Subsequent dynamical…
Accurate and efficient photo-eccentric transit modeling
Mason G. MacDougall, Gregory J. Gilbert, Erik A. Petigura
A planet's orbital eccentricity is fundamental to understanding the present dynamical state of a system and is a relic of its formation history. There is high scientific value in m…
The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars
Mason G. MacDougall, Erik A. Petigura, Gregory J. Gilbert +38
We present the stellar and planetary properties for 85 TESS Objects of Interest (TOIs) hosting 108 planet candidates which comprise the TESS-Keck Survey (TKS) sample. We combine ph…
The Benchmark M Dwarf Eclipsing Binary CM Draconis With TESS: Spots, Flares and Ultra-Precise Parameters
David V. Martin, Ritika Sethi, Tayt Armitage +3
A gold standard for the study of M dwarfs is the eclipsing binary CM Draconis. It is rare because it is bright () and contains twin fully convective stars on an al…
TESS-Keck Survey XIV: Two giant exoplanets from the Distant Giants Survey
Judah E. Van Zandt, Erik A. Petigura, Mason MacDougall +42
We present the Distant Giants Survey, a three-year radial velocity (RV) campaign to measure P(DG|CS), the conditional occurrence of distant giant planets (DG; M_p ~ 0.3 - 13 M_J, P…
Implicit biases in transit models using stellar pseudo-density
Gregory J. Gilbert, Mason G. MacDougall, Erik A. Petigura
The transit technique is responsible for the majority of exoplanet discoveries to date. Characterizing these planets involves careful modeling of their transit profiles. A common t…
Accurate modeling of grazing transits using umbrella sampling
Gregory J. Gilbert
Grazing transits present a special problem for statistical studies of exoplanets. Even though grazing planetary orbits are rare (due to geometric selection effects), for many low t…
An information theoretic framework for classifying exoplanetary system architectures
Gregory J. Gilbert, Daniel C. Fabrycky
We propose several descriptive measures to characterize the arrangements of planetary masses, periods, and mutual inclinations within exoplanetary systems. These measures are based…