Journal Article

Accounting for velocity jitter in planet search surveys

Roman V. Baluev

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 393, issue 3, pages 969-978
Published in print March 2009 | ISSN: 0035-8711
Published online February 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14217.x
Accounting for velocity jitter in planet search surveys

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The role of radial velocity (RV) jitter in extrasolar planet search surveys is discussed. Based on the maximum-likelihood principle, improved statistical algorithms for RV fitting and period search are developed. These algorithms incorporate a built-in jitter determination, so that resulting estimations of planetary parameters account for this jitter automatically. This approach is applied to RV data for several extrasolar planetary systems. It is shown that many RV planet search surveys suffer from periodic systematic errors which increase effective RV jitter and can lead to erroneous conclusions. For instance, the planet candidate HD 74156 d may be a false detection made due to annual systematic errors.

Keywords: methods: data analysis; methods: statistical; techniques: radial velocities; surveys; stars: individual: HD 74156; stars: planetary systems

Journal Article.  8721 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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