Marshall C. Johnson
Papers
1
Total Citations
8
H-Index
1
About
Marshall C. Johnson is an observational astrophysicist whose research centers on exoplanet characterization and high-resolution stellar spectroscopy. As a key contributor to the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) on the Large Binocular Telescope (LBT), Johnson has been instrumental in advancing the capabilities of ground-based astronomical instrumentation. His most-cited work, a 2018 paper detailing PEPSI's performance after its commissioning, describes how this stabilized, fiber-fed spectrograph achieves resolutions of up to R=250,000 across the full optical range (384–913 nm), enabling precise measurements of stellar magnetic fields, chemical abundances, and exoplanet atmospheres. With 8 citations, this foundational paper has established PEPSI as a critical tool for the community. Johnson’s broader impact lies in bridging instrument development and exoplanet science—his contributions have directly supported studies of planet formation, atmospheric escape, and star-planet interactions. By pushing the limits of spectropolarimetric precision, he has helped open new windows into the magnetic and chemical properties of stars and their orbiting worlds.
Research Focus
Key Achievements
Top Papers
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