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Speckle Suppression with the Project 1640 Integral Field Spectrograph

Crepp, Justin R. and Pueyo, Laurent and Brenner, Douglas and Oppenheimer, Ben R. and Zimmerman, Neil and Hinkley, Sasha and Parry, Ian and King, David and Vasisht, Gautam and Beichman, Charles and Hillenbrand, Lynne and Dekany, Richard and Shao, Mike and Burruss, Rick and Roberts, Lewis C. and Bouchez, Antonin and Roberts, Jenny and Soummer, Rémi (2011) Speckle Suppression with the Project 1640 Integral Field Spectrograph. Astrophysical Journal, 729 (2). Art. No. 132. ISSN 0004-637X.

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Project 1640 is a high-contrast imaging instrument recently commissioned at the Palomar observatory. A combination of a coronagraph with an integral-field spectrograph (IFS), Project 1640 is designed to detect and characterize extrasolar planets, brown dwarfs, and circumstellar material orbiting nearby stars. In this paper, we present our data processing techniques for improving upon instrument raw sensitivity via the removal of quasi-static speckles. Our approach utilizes the chromatic image diversity provided by the IFS in combination with the locally optimized combination of images algorithm to suppress the intensity of residual contaminating light in close angular proximity to target stars. We describe the Project 1640 speckle suppression pipeline and demonstrate its ability to detect companions with brightness comparable to and below that of initial speckle intensities using on-sky commissioning data. Our preliminary results indicate that suppression factors of at least one order of magnitude are consistently possible, reaching 5σ contrast levels of 2.1 × 10^(–5) at 1" in the H band in 20 minutes of on-source integration time when non-common-path errors are reasonably well calibrated. These results suggest that near-infrared contrast levels of order ≈10^(–7) at subarcsecond separations will soon be possible for Project 1640 and similarly designed instruments that receive a diffraction-limited beam corrected by adaptive optics systems employing deformable mirrors with high actuator density.

Item Type:Article
Related URLs:
URLURL TypeDescription
Crepp, Justin R.0000-0003-0800-0593
Pueyo, Laurent0000-0003-3818-408X
Oppenheimer, Ben R.0000-0001-7130-7681
Zimmerman, Neil0000-0001-5484-1516
Hinkley, Sasha0000-0001-8074-2562
Vasisht, Gautam0000-0002-1871-6264
Beichman, Charles0000-0002-5627-5471
Roberts, Lewis C.0000-0003-3892-2900
Soummer, Rémi0000-0003-2753-2819
Additional Information:© 2011 American Astronomical Society. Received 2010 September 21; accepted 2010 December 14; published 2011 February 18. We are grateful to the staff at Palomar Observatory for their support. Project 1640 is funded by National Science Foundation Grants AST-0520822, AST-0804417, and AST-0908484. L.P. and S.H. acknowledge support from the Carl Sagan Fellowship Program. This work was performed in part under contract with the California Institute of Technology, funded by the National Aeronautics and Space Administration (NASA), through the Sagan Fellowship Program. A portion of the research presented in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contrast with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:instrumentation: adaptive optics; techniques: high angular resolution; techniques: spectroscopic
Issue or Number:2
Classification Code:PACS: 95.75.-z; 97.20.-w; 95.55.Qf; 97.82.-j
Record Number:CaltechAUTHORS:20110412-115424718
Persistent URL:
Official Citation:Speckle Suppression with the Project 1640 Integral Field Spectrograph Justin R. Crepp et al. 2011 ApJ 729 132
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23282
Deposited By: Jason Perez
Deposited On:14 Apr 2011 17:04
Last Modified:20 Feb 2020 19:05

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