MAROON-X: the first two years of EPRVs from Gemini North

Andreas Seifahrt*, Jacob L. Bean, David Kasper, Julian Sturmer, Madison Brady, Robert Liu, Mathias Zechmeister, Guðmundur Stefánsson, Ben Montet, John White, Eduardo Tapia, Teo Mocnik, Siyi Xu, Christian Schwab

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

8 Citations (Scopus)


MAROON-X is a fiber-fed, optical EPRV spectrograph at the 8-m Gemini North Telescope on Mauna Kea, Hawai'i. MAROON-X was commissioned as a visiting instrument in December 2019 and is in regular use since May 2020. Originally designed for RV observations of M-dwarfs, the instrument is used for a broad range of exoplanet and stellar science cases and has transitioned to be the second-most requested instrument on Gemini North over a number of semesters. We report here on the first two years of operations and radial velocity observations. MAROON-X regularly achieves sub-m/s RV performance on sky with a short-term instrumental noise floor at the 30 cm/s level. We will discuss various technical aspects in achieving this level of precision and how to further improve long-term performance.

Original languageEnglish
Title of host publicationGround-based and Airborne Instrumentation for Astronomy IX
EditorsChristopher J. Evans, Julia J. Bryant, Kentaro Motohara
Place of PublicationWashington, DC
Number of pages15
ISBN (Electronic)9781510653504
ISBN (Print)9781510653498
Publication statusPublished - 2022
EventConference on Ground-based and Airborne Instrumentation for Astronomy IX - Montreal, Canada
Duration: 17 Jul 202222 Jul 2022

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceConference on Ground-based and Airborne Instrumentation for Astronomy IX


  • Gemini Observatory
  • EPRV
  • Radial velocity
  • Exoplanets
  • Echelle spectrograph
  • Optical fibers
  • Pupil slicer


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