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Cited by 414

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Speckle Noise and the Detection of Faint Companions

Open access
Racine, René, Walker, Gordon A. H., Nadeau, Daniel, Doyon, René, Marois, Christian·1999·Publications of the Astronomical Society of the Pacific

Abstract

Speckles dominate shot noise within the halo of adaptively corrected bright star images and, consequently, impose severe limits on ground‐based attempts to directly detect planets around nearby stars. The effect is orders of magnitude greater than conventional photon noise. It depends on the dwell time of the speckle pattern, the brightness of the star, and the fraction (1 - S) of residual light in the halo ( S being the Strehl ratio of the image). These predictions agree well with limits found using the Canada‐France‐Hawaii Telescope adaptive optics bonnette. The limiting brightness for detection is proportional to (1 - S)/S, emphasizing the need for large Strehl ratios. Strategies to reduce speckle noise are proposed; the encouraging results of a test are presented.

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Metadata

Authors
Racine, R., Walker, G. A. H., Nadeau, D., Doyon, R., & Marois, C.
Venue
Publications of the Astronomical Society of the Pacific
Published
1999-05
Volume
111
Issue
759
Pages
587-594
ISSN
  • 0004-6280 (ISSN-L)
  • 1538-3873
OpenAlex
W2175787677
Cited by
414
References
1
FWCI
4.71
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Speckle Noise and the Detection of Faint Companions. https://app.cochat.ai/papers/10.1086/316367
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Racine, R., Walker, G. A. H., Nadeau, D., Doyon, R., & Marois, C. (1999). Speckle Noise and the Detection of Faint Companions. Publications of the Astronomical Society of the Pacific. https://doi.org/10.1086/316367

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