Justin R. Crepp

Freimann Assistant Professor of Physics

Penn State, BS, 2003
University of Florida, PhD, 2008
Office phone: 574-631-4092
Office: 339C Nieuwland Science Hall

iLocater web site

Research Interests

My research involves developing new technologies and observational techniques to detect faint substellar companions that orbit nearby stars. Specifically, I design and build instruments that operate at visible and near-infrared wavelengths to directly image and study brown dwarfs and extrasolar planets. I also use the Doppler method to measure the radial velocity "wobble" of stars as they gravitationally interact with their planets. 

I am leading a new observing program called "TRENDS" that combines the Doppler method with high-contrast imaging. When working in tandem, these two powerful and complementary techniques can yield an accurate measure of the mass of substellar companions using orbital dynamics.  

Meanwhile, in the lab, I am working on a new instrument called "iLocater". The Infrared Large binOCulAr Telescope Exoplanet Recovery (iLocater) Spectrograph is the first fiber-fed Doppler instrument designed to operate behind an adaptive optics system. iLocater will identify terrestrial planets orbiting in the habitable zone of nearby stars by achieving unprecedented radial velocity precision at near-infrared wavelengths.


Kepler participating scientist

TESS mission

iLocater Instrument Approved for Construction




Click here to go to a list of Prof. Crepp's publications.