Publications

First-author and highlighted contributions

• 2026
  Space-Based Proper Motion Measurements in the Era of JWST

  J. T. Warfield

  PhD Dissertation, University of Virginia

  • DOI
  • Libra
• 2026
  The Proper Motion of Draco II with HST using Multiple Reference Frames and Methodologies

  J. T. Warfield, K. A. McKinnon, S. T. Sohn, et al.

  ApJ 998, 3

  • DOI
  • arXiv
• 2024
  The APO-K2 Catalog. II. Accurate Stellar Ages for Red Giant Branch Stars Across the Milky Way

  J. T. Warfield, J. C. Zinn, J. Schonhut-Stasik, et al.

  AJ 167, 208

  • DOI
  • arXiv
  • Age tables
• 2024
  The APO-K2 Catalog. I. 7,673 Red Giants with Fundamental Stellar Parameters from APOGEE DR17 Spectroscopy and K2-GAP Asteroseismology

  J. Schonhut-Stasik, J. C. Zinn, K. G. Stassun, et al. (incl. J. T. Warfield)

  AJ 167, 50

  • DOI
  • arXiv
• 2023
  The JWST Resolved Stellar Populations Early Release Science Program. III. Photometric Star-Galaxy Separations for NIRCam

  J. T. Warfield, H. Richstein, N. Kallivayalil, et al.

  Res. Notes AAS 7, 23

  • DOI
  • arXiv
• 2023
  HubPUG: Proper Motions for Local Group Dwarfs observed with HST utilizing Gaia as a Reference Frame

  J. T. Warfield, N. Kallivayalil, P. Zivick, et al.

  MNRAS 519, 1189

  • DOI
  • arXiv
  • Code
• 2021
  An Intermediate-age Alpha-rich Galactic Population in K2

  J. T. Warfield, J. C. Zinn, M. H. Pinsonneault, J. A. Johnson, et al.

  AJ 161, 100

  • DOI
  • arXiv
• 2018
  Optical and electrical properties of Sn-doped ZnO single crystals

  M. S. Haseman, P. Saadaktia, J. T. Warfield, J. Lawrence, A. Harnandez, G. E. Jellison, L. A. Boatner, F. A. Selim

  Journal of Electronic Materials 47, 1497

  • DOI

Highlighted observing programs

• 2023
  Moving Beyond the Milky Way: Enabling Cross-Observatory Proper Motion Determinations with HST and JWST

  P.I.: J. T. Warfield

  • HST Cycle 31, ID #17473
  • JWST Cycle 2, ID #4570

Link to full list →

Other publications

• 2026
  From observing strategies to velocity dispersion bias: forward modeling unresolved binaries in ultra-faint dwarf galaxies

  X. Ou, A. B. Pace, N. Kallivayalil, et al.

  arXiv:2609.19407submitted to ApJ

  • DOI
• 2026
  The JWST Resolved Stellar Populations Early Release Science Program. IX. The RR Lyrae Population in WLM with HST and JWST

  C. M. Slaughter, E. D. Skillman, A. Savino, et al.

  ApJ 1006, 253

  • DOI
  • arXiv
• 2026
  Constraining the shape of dark matter haloes using only starlight II. Tests of the technique with objects of known gravitational potential

  J. Sánchez Almeida, A. R. Plastino, S. Guerra Arencibia, N. Kallivayalil, J. T. Warfield

  arXiv:2607.27001accepted to A&A

  • DOI
• 2026
  Hubble Astrometry for the Local Group and Beyond in the 2030s

  S. T. Sohn, P. Bennet, K. A. McKinnon, et al.

  arXiv:2605.24191HST 2030s roadmap white paper

  • DOI
• 2025
  The abundance and properties of the lowest luminosity dwarf galaxies around the Milky Way: Insights from Semi-Analytic Models

  N. Ahvazi, A. B. Pace, C. T. Garling, et al.

  arXiv:2511.15808submitted to OJAp

  • DOI
• 2025
  Measuring Resolved Star Formation Histories from High-precision Color–Magnitude Diagrams with StarFormationHistories.jl

  C. T. Garling, N. Kallivayalil, K. B. W. McQuinn, et al.

  ApJS 277, 61

  • DOI
  • arXiv
• 2025
  The JWST Resolved Stellar Populations Early Release Science Program. VIII. The Spatially Resolved Star Formation History of WLM

  R. E. Cohen, K. B. W. McQuinn, A. Savino, et al.

  ApJ 981, 153

  • DOI
  • arXiv
• 2024
  The JWST Resolved Stellar Populations Early Release Science Program. VII. Stress Testing the NIRCam Exposure Time Calculator

  A. Savino, M. Gennaro, A. E. Dolphin, et al.

  ApJ 970, 36

  • DOI
  • arXiv
• 2024
  The JWST Resolved Stellar Populations Early Release Science Program. VI. Identifying Evolved Stars in Nearby Galaxies

  M. L. Boyer, G. Pastorelli, L. Girardi, et al.

  ApJ 973, 120

  • DOI
  • arXiv
• 2024
  Deep Hubble Space Telescope Photometry of LMC and Milky Way Ultra-Faint Dwarfs: A Careful Look into the Magnitude-Size Relation

  H. Richstein, N. Kallivayalil, J. D. Simon, et al.

  ApJ 967, 72

  • DOI
  • arXiv
• 2024
  The JWST Resolved Stellar Populations Early Release Science Program. V. DOLPHOT Stellar Photometry for NIRCam and NIRISS

  D. R. Weisz, A. E. Dolphin, A. Savino, et al.

  ApJS 271, 47

  • DOI
  • arXiv
• 2024
  The JWST Resolved Stellar Populations Early Release Science Program. IV. The Star Formation History of the Local Group Galaxy WLM

  K. B. W. McQuinn, M. Newman, A. Savino, et al.

  ApJ 961, 16

  • DOI
  • arXiv
• 2023
  The Hubble Space Telescope Survey of M31 Satellite Galaxies. III. Calibrating the Horizontal Branch as an Age Indicator for Nearby Galaxies

  C. Jennings, A. Savino, D. Weisz, et al.

  arXiv:2311.16397submitted to AJ

  • DOI
• 2023
  NANCY: Next-generation All-sky Near-infrared Community surveY

  J. J. Han, A. Dey, A. M. Price-Whelan, et al.

  arXiv:2306.11784Roman Core Community Survey white paper

  • DOI
• 2023
  The JWST Resolved Stellar Populations Early Release Science Program. II. Survey Overview

  D. R. Weisz, K. B. W. McQuinn, A. Savino, et al.

  ApJS 268, 15

  • DOI
  • arXiv
• 2022
  Structural parameters and possible association of the Ultra-Faint Dwarfs Pegasus III and Pisces II from deep Hubble Space Telescope photometry

  H. Richstein, E. Patel, N. Kallivayalil, et al.

  ApJ 933, 217

  • DOI
  • arXiv
• 2022
  The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar, and APOGEE-2 Data

  Abdurro'uf, K. Accetta, C. Aerts, et al.

  ApJS 259, 35

  • DOI
  • arXiv
• 2022
  The K2 Galactic Archaeology Program Data Release 3: Age-abundance patterns in C1-C8, C10-C18

  J. C. Zinn, D. Stello, Y. Elsworth, et al.

  ApJ 926, 191

  • DOI
  • arXiv
• 2020
  The K2 Galactic Archaeology Program Data Release 2: Asteroseismic Results From Campaigns 4, 6, & 7

  J. C. Zinn, D. Stello, Y. Elsworth, et al.

  ApJS 251, 23

  • DOI
  • arXiv