Strongly Lensed Supernovae
Using multiply imaged supernovae and time delays as a distinct cosmological probe with different sensitivities and systematics from current approaches.
Research Areas
Type Ia Supernova Cosmology
Improving supernova distance measurements through better models, infrared observations, survey design, and understanding systematics from progenitor changes with redshift.
High-Redshift Supernovae
Using JWST discoveries to test whether supernova populations and Type Ia supernova standardization behavior evolve in the early universe.
Scientific Infrastructure
Building software, workflows, and collaborations that turn rare-event discovery into robust physical inference.
Recent Papers
Recent refereed first-author work
A selection of recent first-author papers spanning lensed supernova cosmology, high-redshift transients, and software-enabled survey science.
2026-02-00 • The Astrophysical Journal
Cosmology with Supernova Encore in the Strong Lensing Cluster MACS J0138─2155: Time Delays and Hubble Constant Measurement
Pierel, J. D. R., Hayes, E. E., Millon, M., Larison, C., Mamuzic, E., et al.
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2025-03-00 • The Astrophysical Journal
Testing for Intrinsic Type Ia Supernova Luminosity Evolution at z > 2 with JWST
Pierel, J. D. R., Coulter, D. A., Siebert, M. R., Akins, H. B., Engesser, M., et al.
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2024-08-00 • The Astrophysical Journal
Discovery of an Apparent Red, High-velocity Type Ia Supernova at z = 2.9 with JWST
Pierel, J. D. R., Engesser, M., Coulter, D. A., DeCoursey, C., Siebert, M. R., et al.
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Active Telescope Programs
Current and recent observing programs
Recent observing programs related to strongly lensed supernovae, high-redshift transients, and precision cosmology.
2026
Standard-ish Candles: Measuring SN Ia Luminosity Drift at z > 3
2026
Constraining the Hubble Constant with Nebular-Phase Spectroscopy of a 20× Magnified, Multiply-Imaged Supernova
2025