activity
20192026
most citedUpper Limits on Planet Occurrence around Ultracool Dwarfs with K2

15 citations · 19 across the 8 of their papers we have counts for

collaborators

9 papers

cs.HC2026

ContraVis: Evidence-Grounded Visual Analytics for Contradiction Review in Legal Contracts

Luis Sante, Paula Lima, Mariana Rocha +1

Legal contracts are structurally complex documents in which contradictions may emerge across distant and interconnected provisions. Although large language models (LLMs) improve le…

astro-ph.EP2025

Are We There Yet? Challenges in Quantifying the Frequency of Earth Analogs in the Habitable Zone

Rachel B. Fernandes, Samson Johnson, Galen J. Bergsten +43

Searching for life elsewhere in the universe is one of the most highly prioritized pursuits in astronomy today. However, the ability to observe evidence of Earth-like life through…

astro-ph.EP2025

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…

astro-ph.EP2025

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…

astro-ph.EP2025

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…

astro-ph.SR2024★ 4 cited

zoomies: A tool to infer stellar age from vertical action in Gaia data

Sheila Sagear, Adrian M. Price-Whelan, Sarah Ballard +4

Stellar age measurements are fundamental to understanding a wide range of astronomical processes, including Galactic dynamics, stellar evolution, and planetary system formation. Ho…

astro-ph.EP2023

The Orbital Eccentricity Distribution of Planets Orbiting M dwarfs

Sheila Sagear, Sarah Ballard

We investigate the underlying distribution of orbital eccentricities for planets around early-to-mid M dwarf host stars. We employ a sample of 163 planets around early- to mid-M dw…

astro-ph.EP2022

The Perkins INfrared Exosatellite Survey (PINES) I. Survey Overview, Reduction Pipeline, and Early Results

Patrick Tamburo, Philip S. Muirhead, Allison M. McCarthy +9

We describe the Perkins INfrared Exosatellite Survey (PINES), a near-infrared photometric search for short-period transiting planets and moons around a sample of 393 spectroscopica…

astro-ph.SR2019★ 15 cited

Upper Limits on Planet Occurrence around Ultracool Dwarfs with K2

Sheila A. Sagear, Julie N. Skinner, Philip S. Muirhead

The occurrence of planets orbiting ultracool dwarfs is poorly constrained. We present results from a Guest Observer program on NASA's K2 spacecraft to search for transiting planets…