Gemini planet imager observational calibrations IX: Least-squares inversion flux extraction

Zachary H. Draper; Christian Marois; Schuyler Wolff; Marshall Perrin; Patrick J. Ingraham; Jean Baptiste Ruffio; Fredrik T. Rantakyrö; Markus Hartung; Stephen J. Goodsell

doi:10.1117/12.2057156

Gemini planet imager observational calibrations IX: Least-squares inversion flux extraction

Zachary H. Draper, Christian Marois, Schuyler Wolff, Marshall Perrin, Patrick J. Ingraham, Jean Baptiste Ruffio, Fredrik T. Rantakyrö, Markus Hartung, Stephen J. Goodsell

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

16 Scopus citations

Abstract

The Gemini Planet Imager (GPI) is an instrument designed to directly image planets and circumstellar disks from 0.9 to 2.5 microns (the YJHK infrared bands) using high contrast adaptive optics with a lenslet-based integral field spectrograph. We develop an extraction algorithm based on a least-squares method to disentangle the spectra and systematic noise contributions simultaneously. We utilize two approaches to adjust for the effect of flexure of the GPI optics which move the position of light incident on the detector. The first method is to iterate the extraction to achieve minimum residual and the second is to cross-correlate the detector image with a model image in iterative extraction steps to determine an offset. Thus far, this process has made clear qualitative improvements to the cube extraction by reducing the Moiré pattern. There are also improvements to the automated routines for finding flexure offsets which are reliable to with ∼ 0.5 pixel accuracy compared to pixel accuracy prior. Further testing and optimization will follow before implementation into the GPI pipeline.

Original language	English (US)
Title of host publication	Ground-Based and Airborne Instrumentation for Astronomy V
Editors	Suzanne K. Ramsay, Ian S. McLean, Hideki Takami
Publisher	SPIE
ISBN (Electronic)	9780819496157
DOIs	https://doi.org/10.1117/12.2057156
State	Published - 2014
Externally published	Yes
Event	Ground-Based and Airborne Instrumentation for Astronomy V - Montreal, Canada Duration: Jun 22 2014 → Jun 26 2014

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9147
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Ground-Based and Airborne Instrumentation for Astronomy V
Country/Territory	Canada
City	Montreal
Period	6/22/14 → 6/26/14

Keywords

GPI
Gemini Planet Imager
exoplanets
flexure
inversion
least-squares

ASJC Scopus subject areas

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

Access to Document

10.1117/12.2057156

Cite this

Draper, Z. H., Marois, C., Wolff, S., Perrin, M., Ingraham, P. J., Ruffio, J. B., Rantakyrö, F. T., Hartung, M., & Goodsell, S. J. (2014). Gemini planet imager observational calibrations IX: Least-squares inversion flux extraction. In S. K. Ramsay, I. S. McLean, & H. Takami (Eds.), Ground-Based and Airborne Instrumentation for Astronomy V Article 91474Z (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9147). SPIE. https://doi.org/10.1117/12.2057156

Gemini planet imager observational calibrations IX: Least-squares inversion flux extraction. / Draper, Zachary H.; Marois, Christian; Wolff, Schuyler et al.
Ground-Based and Airborne Instrumentation for Astronomy V. ed. / Suzanne K. Ramsay; Ian S. McLean; Hideki Takami. SPIE, 2014. 91474Z (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9147).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Draper, ZH, Marois, C, Wolff, S, Perrin, M, Ingraham, PJ, Ruffio, JB, Rantakyrö, FT, Hartung, M & Goodsell, SJ 2014, Gemini planet imager observational calibrations IX: Least-squares inversion flux extraction. in SK Ramsay, IS McLean & H Takami (eds), Ground-Based and Airborne Instrumentation for Astronomy V., 91474Z, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9147, SPIE, Ground-Based and Airborne Instrumentation for Astronomy V, Montreal, Canada, 6/22/14. https://doi.org/10.1117/12.2057156

Draper ZH, Marois C, Wolff S, Perrin M, Ingraham PJ, Ruffio JB et al. Gemini planet imager observational calibrations IX: Least-squares inversion flux extraction. In Ramsay SK, McLean IS, Takami H, editors, Ground-Based and Airborne Instrumentation for Astronomy V. SPIE. 2014. 91474Z. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2057156

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abstract = "The Gemini Planet Imager (GPI) is an instrument designed to directly image planets and circumstellar disks from 0.9 to 2.5 microns (the YJHK infrared bands) using high contrast adaptive optics with a lenslet-based integral field spectrograph. We develop an extraction algorithm based on a least-squares method to disentangle the spectra and systematic noise contributions simultaneously. We utilize two approaches to adjust for the effect of flexure of the GPI optics which move the position of light incident on the detector. The first method is to iterate the extraction to achieve minimum residual and the second is to cross-correlate the detector image with a model image in iterative extraction steps to determine an offset. Thus far, this process has made clear qualitative improvements to the cube extraction by reducing the Moir{\'e} pattern. There are also improvements to the automated routines for finding flexure offsets which are reliable to with ∼ 0.5 pixel accuracy compared to pixel accuracy prior. Further testing and optimization will follow before implementation into the GPI pipeline.",

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AB - The Gemini Planet Imager (GPI) is an instrument designed to directly image planets and circumstellar disks from 0.9 to 2.5 microns (the YJHK infrared bands) using high contrast adaptive optics with a lenslet-based integral field spectrograph. We develop an extraction algorithm based on a least-squares method to disentangle the spectra and systematic noise contributions simultaneously. We utilize two approaches to adjust for the effect of flexure of the GPI optics which move the position of light incident on the detector. The first method is to iterate the extraction to achieve minimum residual and the second is to cross-correlate the detector image with a model image in iterative extraction steps to determine an offset. Thus far, this process has made clear qualitative improvements to the cube extraction by reducing the Moiré pattern. There are also improvements to the automated routines for finding flexure offsets which are reliable to with ∼ 0.5 pixel accuracy compared to pixel accuracy prior. Further testing and optimization will follow before implementation into the GPI pipeline.

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Gemini planet imager observational calibrations IX: Least-squares inversion flux extraction

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