Bradford J. Wargelin

Smithsonian Astrophysical Observatory
60 Garden Street, MS-3, Cambridge, MA 02138
bwargelin [at] cfa.harvard.edu // (617) 496-7702 // office B-445

Education

1993 Ph.D. Physics, University of California, Berkeley
1985 S.B. Physics, Massachusetts Institute of Technology

Professional History

2019-present Chandra Uplink Support Interface (USINT) Coordinator, SAO
2008-present Science team member for proposed missions: Constellation-X (Con-X), Generation-X (Gen-X),
  International X-ray Observatory (IXO), Lynx/X-Ray Surveyor, Structure and Evolution of ExoJupiters (SEEJ),
  Normal-incidence Extreme Ultraviolet Photometer (NExtUP; as Project Scientist), and Line Emission Mapper (LEM)
1998-present Chandra X-Ray Center Calibration Scientist, Smithsonian Astrophysical Observatory
1993-1998 AXAF Ground Calibration Scientist, Smithsonian Astrophysical Observatory

Recent Research Awards

2025 PI, "GJ 358's Stellar Cycle: Small Ro, Short Pcyc, Big Questions," Chandra Guest Observer/Cycle 27
2025 PI, "Spinning on that Dizzy Edge: F-Star Magnetic Activity Cycles," NICER Guest Observer/Cycle 7
2023 PI, "F-Star Stellar Cycles," Chandra Guest Observer/Cycle 25
2021 PI, "The X-Ray View of Stellar Cycles," XMM Guest Observer/Cycle 20
2021 PI, "Does Proxima Centauri Really Have a Stellar Cycle?," Swift Guest Investigator/Cycle 17
2020 PI, "X-Ray Stellar Cycles at Low Rossby Number," Chandra Guest Observer/Cycle 22
2020 PI, "Proxima Centauri's Stellar Cycle," Swift Guest Investigator/Cycle 16
2019 PI, "X-Ray Stellar Cycles at Low Rossby Number," Chandra Guest Observer/Cycle 21
2019 PI, "The X-Ray View of Stellar Cycles," XMM Guest Observer/Cycle 18
2019 PI, "Proxima Centauri's Stellar Cycle," Swift Guest Investigator/Cycle 15

General Fields of Interest

High-energy astrophysics: Stellar coronae, solar wind charge exchange, soft X-ray background, local ISM
Solar/stellar astrophysics: Stellar cycles and winds, interaction of winds and planetary atmospheres
Laboratory X-ray astrophysics: High-resolution spectroscopy, electron impact excitation, charge exchange

Recent Publications

  • "X-Ray, UV, and Optical Observations of Proxima Centauri's Stellar Cycle,"
    B.J. Wargelin, S.H. Saar, Z.A. Irving, J.D. Slavin, P. Ratzlaff, and J.-D. do Nascimento, Jr.,
    Astrophys. J. 977, 144 (2024)

  • "Stellar Cycles in Fully Convective Stars and a New Interpretation of Dynamo Evolution,"
    Z.A. Irving, S.H. Saar, B.J. Wargelin, and J.-D. do Nascimento, Jr.,
    Astrophys. J. 949, 51 (2023)

  • "Pointing Chandra Toward the Extreme Ultraviolet Fluxes of Very Low-Mass Stars,"
    J.J. Drake, V.L. Kashyap, B.J. Wargelin, and S.J. Wolk,
    Astrophys. J., 893, 137 (2020)

  • "Optical, UV, and X-Ray Evidence for a 7-year Stellar Cycle in Proxima Centauri,"
    B.J. Wargelin, S.H. Saar, G. Pojmański, J.J. Drake, and V.L. Kashyap,
    MNRAS, 464, 3281 (2017)

  • "Observation and Modeling of Geocoronal Charge Exchange X-Ray Emission During Solar Wind Gusts,"
    B.J. Wargelin, M. Kornbleuth, P.L. Martin, and M. Juda,
    Astrophys. J., 796, 28 (2014)

  • "Solar Wind Charge Exchange Emission in the Chandra Deep Field North,"
    J.D. Slavin, B.J. Wargelin, and D. Koutroumpa,
    Astrophys. J., 779, 13 (2013)