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Calibration of Astronomical Spectrographs with Stabilized Fabry-Perot Etalons

Total Cost €


EC-Contrib. €






 STABLE_FABRY project word cloud

Explore the words cloud of the STABLE_FABRY project. It provides you a very rough idea of what is the project "STABLE_FABRY" about.

precise    sun    broadband    perturbation    etalon    significantly    chicken    stable    twins    stability    holy    earth    relatively    removing    calibrator    referencing    consists    fabry    tool    easily    characterizing    uses    science    star    extremely    cm    light    visible    zone    doppler    detections    inexpensive    laser    grail    near    reached    magnitude    track    atomic    sources    detection    rv    spectrograph    optimized    resolution    perot    data    velocity    observatory    motivating    frequency    demonstrated    radial    comb    secure    egg    precision    stabilized    preliminary    twin    planets    drifts    perform    indicates    breakthrough    spectrum    exoplanet    indispensable    simply    solves    imperfections    expensive    building    instruments    infrared    imposes    transition    extrasolar    limitations    technique    spectroscopy    planet    detecting    spectrographs    standard    nearly    parent    calibration    echelle    ready    measuring    habitable   

Project "STABLE_FABRY" data sheet

The following table provides information about the project.


Organization address
postcode: 69117

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Germany [DE]
 Project website
 Total cost 159˙460 €
 EC max contribution 159˙460 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2014
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2016
 Duration (year-month-day) from 2016-04-15   to  2018-04-30


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

The “holy grail” of exoplanet research today is the detection of an Earth-like planet in the habitable zone of a Sun-like star. Doppler spectroscopy is an indispensable tool for finding and characterizing extrasolar planets; however, detecting an Earth twin by measuring the radial velocity (RV) perturbation it imposes on the parent star requires nearly one order of magnitude better RV precision than the best current spectrographs provide. A key component in addressing the limitations of existing instruments is the development of extremely precise calibration light sources that can be used to track drifts and imperfections of the spectrograph, removing them from the science data. A stable, reliable, and relatively inexpensive calibrator solves a “chicken and egg” problem in the field – motivating the building of more stable spectrographs, secure in the knowledge that they will be able to perform to their potential. Project STABLE_FABRY consists of developing a novel calibration technique that can be applied to a wide range of high resolution spectrographs. This technique uses a broadband Fabry-Perot etalon to provide the calibration spectrum; the etalon is stabilized by referencing it to an atomic transition using standard laser spectroscopy methods. Our preliminary work already indicates that a stability of 3 cm/s can be reached with this method, making it precise enough for detection of Earth-like planets. The only other currently available calibration technology with demonstrated precision at that level is the laser frequency comb, which is an order of magnitude more complex and significantly more expensive. Our technique can easily be adapted to different echelle spectrographs in the visible and near infrared by simply using an etalon optimized for that particular spectrograph. Developing this concept into an observatory-ready system will present a major breakthrough for high precision spectrographs, enabling detections of Earth twins with Doppler spectroscopy.


year authors and title journal last update
List of publications.
2016 C. Schwab, N. Jovanovic, T. Feger, M. Bakovic, Y. V. Gurevich, J. Stürmer, R. Apodaca, L. Vanzi, S. Rukdee, J. S. Lawrence, D. W. Coutts, N. Cvetojevic, S. Mahadevan, G. K. Stefánsson, S. P. Halverson, O. Guyon
Adaptive optics fed single-mode spectrograph for high-precision Doppler measurements in the near-infrared
published pages: 991274, ISSN: , DOI: 10.1117/12.2234407
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II 2019-06-18
2016 C. Schwab, A. Rakich, Q. Gong, S. Mahadevan, S. P. Halverson, A. Roy, R. C. Terrien, P. M. Robertson, F. R. Hearty, E. I. Levi, A. J. Monson, J. T. Wright, M. W. McElwain, C. F. Bender, C. H. Blake, J. Stürmer, Y. V. Gurevich, A. Chakraborty, L. W. Ramsey
Design of NEID, an extreme precision Doppler spectrograph for WIYN
published pages: 99087H, ISSN: , DOI: 10.1117/12.2234411
Ground-based and Airborne Instrumentation for Astronomy VI 2019-06-18
2017 J Baron, W C Campbell, D DeMille, J M Doyle, G Gabrielse, Y V Gurevich, P W Hess, N R Hutzler, E Kirilov, I Kozyryev, B R O’Leary, C D Panda, M F Parsons, B Spaun, A C Vutha, A D West, E P West, ACME Collaboration
Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide
published pages: 73029, ISSN: 1367-2630, DOI: 10.1088/1367-2630/aa708e
New Journal of Physics 19/7 2019-06-18

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