5 papers
An Increase in the Galactic Planet Host Fraction Fails to Reproduce the Galactic Height Trend in Planet Occurrence
Christopher Lam, Sarah Ballard, Sheila Sagear +1
While stellar metallicity has long been known to correlate with planetary properties, the galactic metallicity gradient alone does not account for the observed strong trend in plan…
A Search for Transit Duration Variations in M dwarf Multi-Planet Systems
Kohhei Bessho, Sarah Ballard, Natalia Guerrero
The nominal habitable zone for exoplanets orbiting M dwarfs lies close to the host star, making dynamical considerations especially important. One consequence of this proximity is…
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…
Updated Masses for the Gas Giants in the Eight-Planet Kepler-90 System Via Transit-Timing Variation and Radial Velocity Observations
David E. Shaw, Lauren M. Weiss, Eric Agol +28
The eight-planet Kepler-90 system exhibits the greatest multiplicity of planets found to date. All eight planets are transiting and were discovered in photometry from the NASA Kepl…
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…