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tokens: A.F.K. acknowledges support from University of Maryland GPHI Task-132, HST GO 13323, NASA Exoplanet Science Institute (NASA/Keck telescope time), an appointment to the NASA Postdoctoral Program at the NASA’s Goddard Space Flight Center, administered by Universities Space Research Association (previously by the Oak Ridge Associated Universities) under contract with NASA. A.F.K. thanks Joel Allred and Mats Carlsson for many helpful discussions about RADYN, Han Uitenbroek for helpful discussions about the RH code, and Pier-Emmanuel Tremblay for the hydrogen broadening profiles. A.F.K. thanks James Davenport for observations from the ARCSAT 0.5 m and for providing a flare rate for GJ 1243, Nicola Gentile Fusillo for observations from the Isaac Newton Telescope, Mihalis Mathioudakis for helpful discussions about the ULTRACAM data, Lyndsay Fletcher for helpful discussions about the interpretation of the HST data, and Lucianne Walkowicz for helpful feedback on the initial HST proposal. We thank R. O. Parke Loyd and the STScI helpdesk for helpful feedback on the jump in the dispersion solution in the COS spectra. A.F.K. also thanks the Keck Observatory support astronomer Luca Rizzi for assistance with the observations. IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for this work was provided by NASA through grant No. Guest Observer 13323 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. Based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium. The 2.3 m Aristarchos telescope is operated on Helmos Observatory by the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing of the National Observatory of Athens. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.