The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST)

Michael J. Ireland*, Étienne Artigau, Greg Burley, Michael Edgar, Steve Margheim, Gordon Robertson, John Pazder, Richard McDermid, Ross Zhelem

*Corresponding author for this work

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

    8 Citations (Scopus)


    The Gemini High-resolution Optical SpecTrograph (GHOST) is a fiber fed spectrograph primarily designed for high efficiency and broad wavelength coverage (363 -1000nm), with an anticipated commissioning early in 2018. The primary scientific goal of the Precision Radial Velocity (PRV) mode will be follow-up of relatively faint (R>12) transiting exoplanet targets, especially from the TESS mission. In the PRV mode, the 1.2 arcsec diameter stellar image will be split 19 ways, combined in a single slit with a simultaneous Th/Xe reference source, dispersed at a resolving power of 80,000 and imaged onto two detectors. The spectrograph will be thermally stabilized in the Gemini pier laboratory, and modal noise will be reduced below other sources through the use of a fiber agitator. Unlike other precision high resolution spectrographs, GHOST will not be pressure controlled (although pressure will be monitored precisely), and there will be no double scrambler or shaped (e.g. octagonal) fibers. Instead, GHOST will have to rely on simultaneous two-color imaging of the slit and the simultaneous Th/Xe fiber to correct for variable fiber illumination and focal-ratio degradation. This configuration presents unique challenges in estimating a PRV error budget.

    Original languageEnglish
    Title of host publicationGround-Based and Airborne Instrumentation for Astronomy VI
    EditorsChristopher J. Evans, Luc Simard, Hideki Takami
    Place of PublicationBellingham, Washington
    Number of pages6
    ISBN (Electronic)9781510601963
    ISBN (Print)9781510601956
    Publication statusPublished - 2016
    EventGround-Based and Airborne Instrumentation for Astronomy VI - Edinburgh, United Kingdom
    Duration: 26 Jun 201630 Jun 2016

    Publication series

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


    OtherGround-Based and Airborne Instrumentation for Astronomy VI
    Country/TerritoryUnited Kingdom


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