Gudmundur Stefansson

Employment

• Princeton University NASA Sagan Fellow
  2022 - Present
• Princeton University Henry Norris Russell Fellow
  2019 - 2022

Education

• Pennsylvania State University University Park Doctor of Philosophy in Astrophysics
  2013 - 2019

Projects & Funding

Projects & funding information is unavailable.

Publications (66)

• Confirmation of the Low-eccentricity Warm Jupiter HD 278555 b with NEID
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae8a50
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• The Neptunian ridge planet WASP-156 b does not have a polar orbit
  Monthly Notices of the Royal Astronomical Society 2026 DOI: 10.1093/mnras/stag996
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• GEMS JWST
  Astrophysical Journal 2026 DOI: 10.3847/1538-4357/ae801f
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• Searching for GEMS
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae82d3
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• Searching for GEMS
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae844e
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• A Revised Mass and Period for the Habitable Zone super-Earth GJ 3378 b
  Astrophysical Journal 2026 DOI: 10.3847/1538-4357/ae732b
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• POSEIDON II. The Antialigned Orbit of the Warm Neptune TOI-1710 A b
  Astrophysical Journal Letters 2026 DOI: 10.3847/2041-8213/ae7711
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• POSEIDON I
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae75da
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• Revisiting the Exo-Mercury Candidate GJ 367 b with ESPRESSO and a Self-consistent Tidal Distortion Model
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae6cec
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• The NEID Earth Twin Survey. IV. Confirming an 89 days, m sin i = 10 M⊕ Planet Orbiting a Nearby Sun-like Star
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae48f1
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• GEMS JWST
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae4976
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• TOI-1259Ab
  Astronomy and Astrophysics 2026 DOI: 10.1051/0004-6361/202556348
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• An Earth-sized planet on a 5.4 h orbit around a nearby K dwarf
  Astronomy and Astrophysics 2026 DOI: 10.1051/0004-6361/202556365
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• Searching for GEMS
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae2fbb
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• Hipparcos, Gaia, and Radial Velocities Reveal that the Radio-emitting F Star HD 220242 Has an M Dwarf Companion, a Likely Source of the Radio Emission
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae2c55
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• Spectroscopic characterization of LOFAR radio-emitting M dwarfs
  Astronomy and Astrophysics 2026 DOI: 10.1051/0004-6361/202556483
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• A young progenitor for the most common planetary systems in the Galaxy
  Nature 2026 DOI: 10.1038/s41586-025-09840-z
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• Searching for GEMS
  Astronomical Journal 2026 DOI: 10.3847/1538-3881/ae16a2
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• Orbital Decay Candidates Reconsidered
  Planetary Science Journal 2025 DOI: 10.3847/PSJ/ae21db
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• Discovery of a Nearby Habitable Zone Super-Earth Candidate Amenable to Direct Imaging
  Astronomical Journal 2025 DOI: 10.3847/1538-3881/ae0e20
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