Extreme Doppler precision with octagonal fiber scramblers

J. F P Spronck*, Z. A. Kaplan, D. A. Fischer, C. Schwab, A. E. Szymkowiak

*Corresponding author for this work

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

14 Citations (Scopus)


The detection of Earth analogs with radial velocity requires long-term precision of 10 cm/s. One of the factors limiting precision is variation in instrumental profile from observation to observation due to changes in the illumination of the slit and spectrograph optics. Fiber optics are naturally efficient scramblers. Our research is focused on understanding the scrambling properties of fibers with different geometries. We have characterized circular and octagonal fibers in terms of focal ratio degradation, near-field and far-field distributions. We have characterized these fibers using a bench-mounted high-resolution spectrograph: the Yale Doppler Diagnostics Facility (YDDF).

Original languageEnglish
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy IV
EditorsIan S. McLean, Suzanne K. Ramsay, Hideki Takami
Place of PublicationBellingham, WA
Number of pages10
ISBN (Print)9780819491473
Publication statusPublished - 2012
Externally publishedYes
EventGround-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Netherlands
Duration: 1 Jul 20126 Jul 2012


OtherGround-Based and Airborne Instrumentation for Astronomy IV


  • Astronomical optics
  • Exoplanet detection
  • Optical fibers
  • Radial velocity


Dive into the research topics of 'Extreme Doppler precision with octagonal fiber scramblers'. Together they form a unique fingerprint.

Cite this