KH
K. Hardegree-Ullman
astro-ph.EPastro-ph.SRastro-ph.IMastro-ph.GAcs.AIcs.LGExoplanetsplanetary systemsRings and moonsstars: fundamental parameters
On Valency
published · living versionsW_krd8hket·v1 · currentpublished
The Most Massive Heartbeat: An In-depth Analysis of ι Orionis
with Herbert Pablo, N. D. Richardson, J. Fuller, J. Rowe +15
1 version
Preprints & journals
57 papers in the corpus · 2012–2026A Spitzer Space Telescope Exploration Science Program to Search for Y Dwarf Variability2606.26411v1 · Michael C. Cushing, Jesica L. Trucks, Kevin K. Hardegree-Ullman et al.2026 · 0 citationsarXiv
COUNTESS I: A Uniformly Vetted Catalog of Known and New Transiting Exoplanets in the TESS Northern Continuous Viewing Zone2606.13789v2 · Andrew Hotnisky, Rachel B. Fernandes, Kevin K. Hardegree-Ullman et al.2026 · 0 citationsarXiv
Exoplanets in ancient stellar populations: occurrence constraints and hot-Jupiter candidates in the Galactic halo2605.19000v1 · Dolev Bashi, Michelle Kunimoto, Kevin K. Hardegree-Ullman et al.2026 · 1 citationarXiv
Gaia DR3 IDs for TESS Input Catalog Targets2603.28850v1 · Kevin K. Hardegree-Ullman, Melanie Swain, Jessie L. Christiansen et al.2026 · 0 citationsarXiv
Modeling the Impact of Unresolved Stellar Companions on Detection Sensitivity in Kepler's Small Planet Occurrence Rates2601.16031v1 · Galen J. Bergsten, David R. Ciardi, Jessie L. Christiansen et al.2026 · 0 citationsarXiv
Bioverse: Assessing the Ability of Direct Imaging Surveys to Empirically Constrain the Habitable Zone via Trends in Albedo2509.07297v1 · Noah W. Tuchow, Christopher C. Stark, Daniel Apai et al.2025 · 1 citationarXiv
Scaling K2 VIII: Short-Period Sub-Neptune Occurrence Rates Peak Around Early-Type M Dwarfs2508.05734v1 · Kevin K. Hardegree-Ullman, Galen J. Bergsten, Jessie L. Christiansen et al.2025 · 5 citationsarXiv
The NASA Exoplanet Archive and Exoplanet Follow-up Observing Program: Data, Tools, and Usage2506.03299v1 · Jessie L. Christiansen, Douglas L. McElroy, Marcy Harbut et al.2025 · 139 citationsarXiv
Bioverse: Potentially Observable Exoplanet Biosignature Patterns Under the UV Threshold Hypothesis for the Origin of Life2504.04261v1 · Martin Schlecker, D'aniel Apai, Antonin Affholder et al.2025 · 1 citationarXiv
Signatures of Atmospheric Mass Loss and Planet Migration in the Time Evolution of Short-Period Transiting Exoplanets2503.10856v1 · Rachel B. Fernandes, Galen J. Bergsten, Gijs D. Mulders et al.2025 · 17 citationsarXiv
GEMS JWST: Transmission spectroscopy of TOI-5205b reveals significant stellar contamination and a metal-poor atmosphere2502.06966v3 · Caleb I. Canas, Jacob Lustig-Yaeger, Shang-Min Tsai et al.2025 · 7 citationsarXiv
Planet Masses, Radii, and Orbits from NASA's K2 Mission2502.04436v1 · Andrew W. Howard, Evan Sinukoff, Sarah Blunt et al.2025 · 13 citationsarXiv
The Palomar twilight survey of 'Ayló'chaxnim, Atiras, and comets2409.15263v1 · B. T. Bolin, F. J. Masci, M. W. Coughlin et al.2024 · 6 citationsarXiv
The First Evidence of a Host Star Metallicity Cut-off In The Formation of Super-Earth Planets2407.13821v1 · Kiersten M. Boley, Jessie L. Christiansen, Jon Zink et al.2024 · 22 citationsarXiv
New ephemerides and detection of transit-timing variations in the K2-138 system using high-precision CHEOPS photometry2406.18267v1 · H. G. Vivien, S. Hoyer, M. Deleuil et al.2024 · 4 citationsarXiv
Bioverse: GMT and ELT Direct Imaging and High-Resolution Spectroscopy Assessment $\unicode{x2013}$ Surveying Exo-Earth O and Testing the Habitable Zone Oxygen Hypothesis2405.11423v2 · Kevin K. Hardegree-Ullman, D'aniel Apai, Sebastiaan Y. Haffert et al.2024 · 0 citationsarXiv
Metallicities and Refined Stellar Parameters for 52 Cool Dwarfs with Transiting Planets and Planet Candidates2402.13223v1 · Rebecca Gore, Steven Giacalone, Courtney D. Dressing et al.2024 · 10 citationsarXiv
A Reply to: Large Exomoons unlikely around Kepler-1625 b and Kepler-1708 b2401.10333v1 · David Kipping, Alex Teachey, Daniel A. Yahalomi et al.2024 · 2 citationsarXiv
Scaling K2 VII: Evidence for a high occurrence rate of hot sub-Neptunes at intermediate ages2311.18709v1 · Jessie L. Christiansen, Jon K. Zink, Kevin K. Hardegree-Ullman et al.2023 · 23 citationsAJ 166 248 (2023)
No Evidence for More Earth-sized Planets in the Habitable Zone of Kepler's M versus FGK Stars2310.11613v1 · Galen J. Bergsten, Ilaria Pascucci, Kevin K. Hardegree-Ullman et al.2023 · 17 citationsarXiv
Clouds and Clarity: Revisiting Atmospheric Feature Trends in Neptune-size Exoplanets2310.07714v2 · Jonathan Brande, Ian J. M. Crossfield, Laura Kreidberg et al.2023 · 60 citationsApJL 961 L23 (2024)
Water absorption in the transmission spectrum of the water-world candidate GJ9827d2309.10845v1 · Pierre-Alexis Roy, Bjorn Benneke, Caroline Piaulet et al.2023 · 30 citationsApJL 954 L52 (2023)
Bioverse: The Habitable Zone Inner Edge Discontinuity as an Imprint of Runaway Greenhouse Climates on Exoplanet Demographics2309.04518v2 · Martin Schlecker, D'aniel Apai, Tim Lichtenberg et al.2023 · 25 citationsPlanet. Sci. J. 5 3 (2024)
Using Photometrically-Derived Properties of Young Stars to Refine TESS's Transiting Young Planet Survey Completeness2308.13039v1 · Rachel B. Fernandes, Kevin K. Hardegree-Ullman, Ilaria Pascucci et al.2023 · 18 citationsarXiv
Scaling K2. VI. Reduced Small Planet Occurrence in High Galactic Amplitude Stars2305.13389v1 · Jon K. Zink, Kevin K. Hardegree-Ullman, Jessie L. Christiansen et al.2023 · 40 citationsarXiv
The mass determination of TOI-519 b: a close-in giant planet transiting a metal-rich mid-M dwarf2304.14703v2 · Taiki Kagetani, Norio Narita, Tadahiro Kimura et al.2023 · 25 citationsarXiv
Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O Levels in Nearby Transiting Habitable Zone Exoplanets2304.12490v1 · Kevin K. Hardegree-Ullman, D'aniel Apai, Galen J. Bergsten et al.2023 · 49 citationsarXiv
EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates for Late M Dwarfs within 15 pc2302.04138v1 · Jeremy Dietrich, D'aniel Apai, Martin Schlecker et al.2023 · 12 citationsarXiv
The discovery and characterization of a kilometre sized asteroid inside the orbit of Venus2208.07253v1 · Bryce T. Bolin, T. Ahumada, P. van Dokkum et al.2022 · 25 citationsarXiv
The K2-3 system revisited: testing photoevaporation and core-powered mass loss with three small planets spanning the radius valley2207.12755v2 · Hannah Diamond-Lowe, Laura Kreidberg, C. E. Harman et al.2022 · 35 citationsarXiv
Pterodactyls: A Tool to Uniformly Search and Vet for Young Transiting Planets In TESS Primary Mission Photometry2206.03989v1 · Rachel B. Fernandes, Gijs D. Mulders, Ilaria Pascucci et al.2022 · 20 citationsarXiv
Scaling K2. V. Statistical Validation of 60 New Exoplanets From K2 Campaigns 2-182203.02087v2 · Jessie L. Christiansen, Sakhee Bhure, Jon K. Zink et al.2022 · 25 citationsarXiv
An exomoon survey of 70 cool giant exoplanets and the new candidate Kepler-1708 b-i.35399159 · Kipping, David, Bryson, Steve, Burke, Chris et al.2022 · 88 citationsNature astronomy. 2022;6(3):367-380
Final Report for SAG 22: A Target Star Archive for Exoplanet Science2112.04517v1 · Natalie R. Hinkel, Joshua Pepper, Christopher C. Stark et al.2021 · 0 citationsarXiv
Scaling K2. IV. A Uniform Planet Sample for Campaigns 1-8 and 10-182109.02675v1 · J. K. Zink, K. K. Hardegree-Ullman, J. L. Christiansen et al.2021 · 25 citationsarXiv
K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System2102.08978v1 · Kevin K. Hardegree-Ullman, Jessie L. Christiansen, David R. Ciardi et al.2021 · 13 citationsarXiv
WASP-107b's density is even lower: a case study for the physics of planetary gas envelope accretion and orbital migration2011.13444v1 · Caroline Piaulet, Bjorn Benneke, Ryan A. Rubenzahl et al.2020 · 96 citationsarXiv
Transmission spectroscopy for the warm sub-Neptune HD3167c: evidence for molecular absorption and a possible high metallicity atmosphere2011.03470v1 · Thomas Mikal-Evans, Ian J. M. Crossfield, Bjorn Benneke et al.2020 · 38 citationsarXiv
Preliminary estimates of the Zwicky Transient Facility 'Ayló'chaxnim asteroid population completeness2009.04125v3 · B. T. Bolin, T. Ahumada, P. van Dokkum et al.2020 · 9 citationsarXiv
Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-Size Exoplanet HD 106315 c2006.07444v1 · Laura Kreidberg, Paul Molliere, Ian J.M. Crossfield et al.2020 · 32 citationsarXiv
Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 2001.11511v1 · Kevin K. Hardegree-Ullman, Jon K. Zink, Jessie L. Christiansen et al.2020 · 106 citationsarXiv
Scaling K2. II. Assembly of a Fully Automated C5 Planet Candidate Catalog Using EDI-Vetter2001.11515v1 · Jon K. Zink, Kevin K. Hardegree-Ullman, Jessie L. Christiansen et al.2020 · 27 citationsAJ 2020 Volume 159, Number 4
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars IV: Updated Properties for 86 Cool Dwarfs Observed During Campaigns 1-17.35095106 · Dressing, Courtney D, Hardegree-Ullman, Kevin, Schlieder, Joshua E et al.2025 · 38 citationsThe Astrophysical journal. 2019;158(2)
Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type1905.05900v1 · Kevin K. Hardegree-Ullman, Michael C. Cushing, Philip S. Muirhead et al.2019 · 171 citationsarXiv
Revisiting the HIP41378 system with K2 and Spitzer1809.11116v2 · David Berardo, Ian J. M. Crossfield, Michael Werner et al.2018 · 31 citationsarXiv
Spitzer Light Curves of the Young, Planetary-Mass TW Hya Members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.31804.06917v1 · Adam C. Schneider, Kevin K. Hardegree-Ullman, Michael C. Cushing et al.2018 · 19 citationsarXiv
Characterizing K2 Candidate Planetary Systems Orbiting Low-Mass Stars III: A High Mass & Low Envelope Fraction for the Warm Neptune K2-55b1804.05148v2 · Courtney D. Dressing, Evan Sinukoff, Benjamin J. Fulton et al.2018 · 10 citationsarXiv
Planetary Candidates from K2 Campaign 161803.04091v3 · Liang Yu, Ian J. M. Crossfield, Joshua E. Schlieder et al.2018 · 38 citationsarXiv
2MASS J11151597+1937266: A Young, Dusty, Isolated, Planetary-Mass Object with a Potential Wide Stellar Companion1712.03964v2 · Christopher A. Theissen, Adam J. Burgasser, Daniella C. Bardalez Gagliuffi et al.2017 · 8 citationsarXiv
Investigating the physical properties of transiting hot Jupiters with the 1.5-m Kuiper Telescope1708.07909v1 · Jake D. Turner, Robin M. Leiter, Lauren I. Biddle et al.2017 · 48 citationsarXiv
Career total: at least 171 works. 57 are in this corpus.Showing the 50 most recent.
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