Gemini planet imager observational calibrations VI: Photometric and spectroscopic calibration for the integral field spectrograph

Jérôme Maire, Patrick J. Ingraham, Rob J. De Rosa, Marshall D. Perrin, Abhijith Rajan, Dmitry Savransky, Jason J. Wang, Jean Baptiste Ruffio, Schuyler G. Wolff, Jeffrey K. Chilcote, René Doyon, James R. Graham, Alexandra Z. Greenbaum, Quinn M. Konopacky, James E. Larkin, Bruce A. MacIntosh, Christian Marois, Max Millar-Blanchaer, Jennifer Patience, Laurent A. PueyoAnand Sivaramakrishnan, Sandrine J. Thomas, Jason L. Weiss

Research output: Chapter in Book/Report/Conference proceedingConference contribution

24 Scopus citations


The Gemini Planet Imager (GPI) is a new facility instrument for the Gemini Observatory designed to provide direct detection and characterization of planets and debris disks around stars in the solar neighborhood. In addition to its extreme adaptive optics and coronagraphic systems which give access to high angular resolution and high-contrast imaging capabilities, GPI contains an integral field spectrograph providing low resolution spectroscopy across five bands between 0.95 and 2.5 μm. This paper describes the sequence of processing steps required for the spectro-photometric calibration of GPI science data, and the necessary calibration files. Based on calibration observations of the white dwarf HD 8049 B we estimate that the systematic error in spectra extracted from GPI observations is less than 5%. The flux ratio of the occulted star and fiducial satellite spots within coronagraphic GPI observations, required to estimate the magnitude difference between a target and any resolved companions, was measured in the H-band to be μm = 9.23 ± 0.06 in laboratory measurements and μm = 9.39 ± 0.11 using on-sky observations. Laboratory measurements for the Y, J, K1 and K2 filters are also presented. The total throughput of GPI, Gemini South and the atmosphere of the Earth was also measured in each photometric passband, with a typical throughput in H-band of 18% in the non-coronagraphic mode, with some variation observed over the six-month period for which observations were available. We also report ongoing development and improvement of the data cube extraction algorithm.

Original languageEnglish (US)
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy V
EditorsSuzanne K. Ramsay, Ian S. McLean, Hideki Takami
ISBN (Electronic)9780819496157
StatePublished - 2014
Externally publishedYes
EventGround-Based and Airborne Instrumentation for Astronomy V - Montreal, Canada
Duration: Jun 22 2014Jun 26 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherGround-Based and Airborne Instrumentation for Astronomy V


  • IFS
  • data reduction
  • exoplanets
  • high angular resolution
  • high-contrast imaging
  • spectrophotometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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