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Kevin Hardegree-Ullman

Staff Scientist

California Institute of Technology

United States

Research Interests

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Professors in United States Professors in Astronomy Astronomy professors in United States

Articles (20)

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2026

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2023

Collaborators (16)

Sabina Sagynbayeva

McGill University

CANADA

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Sebastiaan Haffert

Assistant Professor

Leiden University

NETHERLANDS

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Sukrit Ranjan

Assistant Professor

University of Arizona

UNITED STATES

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Michael Cushing

Professor

University of Toledo

UNITED STATES

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Arnaud Salvador

Junior Professor

Institut de Physique du Globe de Paris

FRANCE

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Julian van Eyken

Caltech

UNITED STATES

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Adam J Burgasser

Professor

University of California, San Diego

UNITED STATES

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Tim Lichtenberg

Scientific Staff, Assistant Professor, Universitair docent

University of Groningen

NETHERLANDS

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Renu Malhotra

Professor

University of Arizona

UNITED STATES

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Ji Wang

Prof

Ohio State University

UNITED STATES

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Alexandre Santerne

Astronome Adjoint

Aix-Marseille University

FRANCE

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Kevin Wagner

University of Arizona

UNITED STATES

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Daniel Apai

Professor

University of Arizona

UNITED STATES

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Eric Mamajek

Deputy Program Chief Scientist, NASA Exoplanet Exploration Program

Jet Propulsion Laboratory, California Institute of Technology

UNITED STATES

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Gregory Feiden

Professor of Astronomy

University of North Georgia

UNITED STATES

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Ilaria Pascucci

University of Arizona

UNITED STATES

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Kevin Hardegree-Ullman

Research Interests

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Articles (20)

A Spitzer Space Telescope Exploration Science Program to Search for Y-dwarf Variability

Gaia DR3 IDs for TESS Input Catalog Targets

COUNTESS. I. A Uniformly Vetted Catalog of Known and New Transiting Exoplanets in the TESS Northern Continuous Viewing Zone

Modeling the Impact of Unresolved Stellar Companions on Detection Sensitivity in Kepler’s Small-planet Occurrence Rates

Bioverse: Potentially Observable Exoplanet Biosignature Patterns under the UV Threshold Hypothesis for the Origin of Life

Bioverse: Giant Magellan Telescope and Extremely Large Telescope Direct Imaging and High-resolution Spectroscopy Assessment—Surveying Exo-Earth O2 and Testing the Habitable Zone Oxygen Hypothesis

No Turnover Found in Giant-Planet Occurrence Within 3 au Around Low-mass Stars

Signatures of Atmospheric Mass Loss and Planet Migration in the Time Evolution of Short-period Transiting Exoplanets

Bioverse: Assessing the Ability of Direct Imaging Surveys to Empirically Constrain the Habitable Zone via Trends in Albedo

The NASA Exoplanet Archive and Exoplanet Follow-up Observing Program: Data, Tools, and Usage

Scaling K2. VIII. Short-period Sub-Neptune Occurrence Rates Peak Around Early-type M Dwarfs

Bioverse: The Habitable Zone Inner Edge Discontinuity as an Imprint of Runaway Greenhouse Climates on Exoplanet Demographics

The First Evidence of a Host Star Metallicity Cutoff in the Formation of Super-Earth Planets

New ephemerides and detection of transit-timing variations in the K2-138 system using high-precision CHEOPS photometry

Metallicities and Refined Stellar Parameters for 52 Cool Dwarfs with Transiting Planets and Planet Candidates

Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets

No Evidence for More Earth-sized Planets in the Habitable Zone of Kepler's M versus FGK Stars

Using Photometrically Derived Properties of Young Stars to Refine TESS’s Transiting Young Planet Survey Completeness

Scaling K2. VII. Evidence For a High Occurrence Rate of Hot Sub-Neptunes at Intermediate Ages

Scaling K2. VI. Reduced Small-planet Occurrence in High-galactic-amplitude Stars

Collaborators (16)

Sabina Sagynbayeva

Sebastiaan Haffert

Sukrit Ranjan

Michael Cushing

Arnaud Salvador

Julian van Eyken

Adam J Burgasser

Tim Lichtenberg

Renu Malhotra

Ji Wang

Alexandre Santerne

Kevin Wagner

Daniel Apai

Eric Mamajek

Gregory Feiden

Ilaria Pascucci

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