Improving and Assessing Planet Sensitivity of the GPI Exoplanet Survey with a Forward Model Matched Filter
Creators: name: Ruffio, Jean-Baptiste
name: Macintosh, Bruce
name: Wang, Jason J.
name: Pueyo, Laurent
name: Nielsen, Eric L.
name: De Rosa, Robert J.
name: Czekala, Ian
name: Marley, Mark S.
name: Arriaga, Pauline
name: Bailey, Vanessa P.
name: Barman, Travis
name: Bulger, Joanna
name: Chilcote, Jeffrey
name: Cotten, Tara
name: Doyon, Rene
name: Duchêne, Gaspard
name: Fitzgerald, Michael P.
name: Follette, Katherine B.
name: Gerard, Benjamin L.
name: Goodsell, Stephen J.
name: Graham, James R.
name: Greenbaum, Alexandra Z.
name: Hibon, Pascale
name: Hung, Li-Wei
name: Ingraham, Patrick
name: Kalas, Paul
name: Konopacky, Quinn
name: Larkin, James E.
name: Maire, Jérôme
name: Marchis, Franck
name: Marois, Christian
name: Metchev, Stanimir
name: Millar-Blanchaer, Maxwell A.
name: Morzinski, Katie M.
name: Oppenheimer, Rebecca
name: Palmer, David
name: Patience, Jennifer
name: Perrin, Marshall
name: Poyneer, Lisa
name: Rajan, Abhijith
name: Rameau, Julien
name: Rantakyrö, Fredrik T.
name: Savransky, Dmitry
name: Schneider, Adam C.
name: Sivaramakrishnan, Anand
name: Song, Inseok
name: Soummer, Remi
name: Thomas, Sandrine
name: Wallace, J. Kent
name: Ward-Duong, Kimberly
name: Wiktorowicz, Sloane
name: Wolff, Schuyler
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 (SNR) of the recovered planets. We show that only two spectral templates are necessary to recover any young Jovian exoplanets with minimal SNR loss. We also developed a complete pipeline for the automated detection of point source candidates, the calculation of Receiver Operating Characteristics (ROC), false positives based contrast curves, and completeness contours. We process in a uniform manner more than 330 datasets from the Gemini Planet Imager Exoplanet Survey (GPIES) 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.
description: ApJ accepted