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

2016-present Lynx/X-Ray Surveyor Science & Technology Definition Team: Stellar Cycles
2009 International X-ray Observatory (IXO) Science Team Associate
2008-2009 Generation-X (Gen-X) Facility Science Team: Planets, Stars, and the Galaxy
2008 Constellation-X (Con-X) Facility Science Teams: Solar System, Planet Formation, and Evolution
   • MHD Physics in Stellar Environments • Plasma Diagnostics and Atomic Astrophysics
1998-present Chandra X-Ray Center Calibration Scientist, Smithsonian Astrophysical Observatory
1993-1998 AXAF Ground Calibration Scientist, Smithsonian Astrophysical Observatory

Recent Research Awards

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
2018 PI, "Stellar Cycle Sampling: the X-Ray Expansion," XMM Guest Observer/Cycle 17
2017 PI, "Proxima Centauri's Stellar Cycle," Swift Guest Investigator/Cycle 13
2017 PI, "The Stellar Cycle of Proxima Centauri," XMM Guest Observer/Cycle 16
2016 PI, "Proxima Cen's Stellar Cycle," Chandra Director's Discretionary Time/Cycle 18
2016 PI, Proxima Cen monitoring, Swift TOO observations/Cycle 12

General Fields of Interest

Laboratory X-ray astrophysics: High-resolution spectroscopy, electron impact excitation, charge exchange
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

Recent Publications

  • "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)

  • "X-Ray Flaring on the dMe Star, Ross 154,"
    B.J. Wargelin, V.L. Kashyap, J.J. Drake,
    D. García-Alvarez, and P.W. Ratzlaff,
    Astrophys. J., 676, 610 (2008)

  • "EBIT Charge-Exchange Measurements and Astrophysical Applications,"
    B.J. Wargelin, P. Beiersdorfer, and G.V. Brown,
    Can. J. Physics, 86, 151 (2008)