Justin R. Crepp

Justin Crepp

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Freimann Assistant Professor of Physics

Office: 339C Nieuwland Science Hall
Phone: 574-631-4092
Email: jcrepp@nd.edu

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Areas of Expertise

Orbital motion, high-contrast imaging, giant planets, M-dwarf stars, earth-sized planets, iLocater Doppler spectrometer, exoplanet searches, Kepler Mission

Crepp’s research involves developing new technologies and observational techniques to detect faint substellar companions that orbit nearby stars. He designs and builds instruments that operate at visible and near-infrared wavelengths to directly image and studies brown dwarfs and extrasolar planets. He also uses the Doppler method to measure the radial velocity “wobble” of stars as they gravitationally interact with their planets.

He is leading a new observing program called “TRENDS” that combines the Doppler method with high-contrast imaging.

In the lab, he is 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.


The Discovery of an Earth-Sized Planet

Fighting to Explore our Universe


Astrophysicist takes 20-year astronomy predictions to Congress
Innovations in capturing starlight will help astrophysicists detect planets
Notre Dame celebrates 150 years of science
Indianapolis Shamrock Series events will include academic programs and service activities
Crepp joins NASA’s TESS science team
Astronomers discover Earth-sized planet in habitable zone
Rare brown dwarf discovery provides benchmark for future exoplanet research
NASA awards career fellowship to Notre Dame astrophysicist
NASA names Justin Crepp a Kepler Participating Scientist
Notre Dame astrophysicist determines occurrence rate of giant planets around M-dwarfs
Notre Dame astrophysicist discovers planets similar to Earth
Physicists confirm first planet discovered in a quadruple star system


SpaceRef — Astrophysicist Takes 20-Year Astronomy Predictions to Congress
Beaver County Times — Big Beaver native to lobby Congress against cuts to science funding
Bloomberg — Astronomers Uncover Earth-Like Planet That Could Support Life
Astronomy — Rare brown dwarf discovery provides benchmark for future exoplanet research
South Bend Tribune — Looking for life among stars
Phys.org — Astrophysicist determines occurrence rate of giant planets around M-dwarfs
Agence France Presse — Most Earth-like planets found: NASA
U.S. News & World Report — Newly Discovered Planets ‘Most Earthlike’ Ever Found