Accounting for velocity jitter in planet search surveys

Details Accounting for velocity jitter in planet search surveys Accounting for velocity jitter in planet search surveys

2007-12-22

arxiv.org/abs/0712.3862v4

Mon. Not. R. Astron. Soc., 2009, Vol. 393, Issue 3, pp. 969-978

Astronomy and Astrophysics

Astrophysics

10 pages, 1 figure, 1 table; accepted to MNRAS; 4th version due to a few extra minor corrections in Sect.11 and Tab.1

Scientific paper

10.1111/j.1365-2966.2008.14217.x

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 HD74156 d may be a false detection made due to annual systematic errors.

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