Fiber-stabilized PSF for sub-m/s Doppler precision at Lick Observatory

J. F P Spronck, C. Schwab, D. A. Fischer

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

5 Citations (Scopus)


The detection of Earth analogues requires extreme Doppler precision and long term stability in order to measure tiny reflex velocities in the host star. The PSF from the spectrometer should be slowly varying with temperature and pressure changes. However, variations in the illumination of the slit and of the spectrograph optics occur on time scales of seconds, primarily because of guiding errors, but also on timescales of minutes, because of changes in the focus or seeing. These variations yield differences in the PSF from observation to observation, which are currently limiting the Doppler precision. Here, we present the design of a low cost fiber optic feed, FINDS, used to stabilize the PSF of the Hamilton spectrograph of Lick observatory along with the first measurements that show dramatic improvement in stability.

Original languageEnglish
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy III
Place of PublicationWashington, DC
Number of pages6
EditionPART 1
ISBN (Print)9780819482259
Publication statusPublished - 2010
Externally publishedYes
EventGround-Based and Airborne Instrumentation for Astronomy III - San Diego, CA, United States
Duration: 27 Jun 20102 Jul 2010


OtherGround-Based and Airborne Instrumentation for Astronomy III
CountryUnited States
CitySan Diego, CA


  • Astronomical optics
  • Exoplanet detection
  • Fiber scrambling
  • Radial velocity
  • Spectrographs

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