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Journal Articles The Astrophysical Journal Year : 2017

Improving and Assessing Planet Sensitivity of the GPI Exoplanet Survey with a Forward Model Matched Filter

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Jean-Baptiste Ruffio
  • Function : Author
Bruce Macintosh
Jason J. Wang
  • Function : Author
Laurent Pueyo
  • Function : Author
Eric L. Nielsen
  • Function : Author
Robert J. de Rosa
  • Function : Author
Ian Czekala
  • Function : Author
Mark S. Marley
  • Function : Author
Pauline Arriaga
Vanessa P. Bailey
  • Function : Author
Travis Barman
  • Function : Author
Joanna Bulger
  • Function : Author
Jeffrey Chilcote
Tara Cotten
  • Function : Author
Rene Doyon
  • Function : Author
Michael P. Fitzgerald
  • Function : Author
Katherine B. Follette
  • Function : Author
Benjamin L. Gerard
  • Function : Author
Stephen J. Goodsell
  • Function : Author
James R. Graham
  • Function : Author
Alexandra Z. Greenbaum
  • Function : Author
Pascale Hibon
  • Function : Author
Li-Wei Hung
  • Function : Author
Patrick Ingraham
  • Function : Author
Paul Kalas
Quinn Konopacky
  • Function : Author
James E. Larkin
  • Function : Author
Jérôme Maire
  • Function : Author
Franck Marchis
Christian Marois
Stanimir Metchev
  • Function : Author
Maxwell A. Millar-Blanchaer
  • Function : Author
Katie M. Morzinski
  • Function : Author
Rebecca Oppenheimer
  • Function : Author
David Palmer
  • Function : Author
Jennifer Patience
  • Function : Author
Marshall Perrin
Lisa Poyneer
  • Function : Author
Abhijith Rajan
  • Function : Author
Julien Rameau
  • Function : Author
Fredrik T. Rantakyrö
  • Function : Author
Dmitry Savransky
  • Function : Author
Adam C. Schneider
  • Function : Author
Anand Sivaramakrishnan
  • Function : Author
Inseok Song
  • Function : Author
Remi Soummer
  • Function : Author
Sandrine Thomas
  • Function : Author
J. Kent Wallace
  • Function : Author
Kimberly Ward-Duong
  • Function : Author
Sloane Wiktorowicz
Schuyler Wolff

Abstract

We present a new matched-filter algorithm for direct detection of point sources in the immediate vicinity of bright stars. The stellar point-spread function (PSF) is first subtracted using a Karhunen-Loéve image processing (KLIP) algorithm with angular and spectral differential imaging (ADI and SDI). The KLIP-induced distortion of the astrophysical signal is included in the matched-filter template by computing a forward model of the PSF at every position in the image. To optimize the performance of the algorithm, we conduct extensive planet injection and recovery tests and tune the exoplanet spectra template and KLIP reduction aggressiveness to maximize the signal-to-noise ratio (S/N) of the recovered planets. We show that only two spectral templates are necessary to recover any young Jovian exoplanets with minimal S/N loss. We also developed a complete pipeline for the automated detection of point-source candidates, the calculation of receiver operating characteristics (ROC), contrast curves based on false positives, and completeness contours. We process in a uniform manner more than 330 data sets from the Gemini Planet Imager Exoplanet Survey and assess GPI typical sensitivity as a function of the star and the hypothetical companion spectral type. This work allows for the first time a comparison of different detection algorithms at a survey scale accounting for both planet completeness and false-positive rate. We show that the new forward model matched filter allows the detection of 50% fainter objects than a conventional cross-correlation technique with a Gaussian PSF template for the same false-positive rate.

Dates and versions

insu-03692504 , version 1 (09-06-2022)

Identifiers

Cite

Jean-Baptiste Ruffio, Bruce Macintosh, Jason J. Wang, Laurent Pueyo, Eric L. Nielsen, et al.. Improving and Assessing Planet Sensitivity of the GPI Exoplanet Survey with a Forward Model Matched Filter. The Astrophysical Journal, 2017, 842, ⟨10.3847/1538-4357/aa72dd⟩. ⟨insu-03692504⟩
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