Journal
ASTROPHYSICAL JOURNAL
Volume 715, Issue 1, Pages 500-505Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/715/1/500
Keywords
planets and satellites: detection; stars: individual (55 Cnc, HD 40307); Sun: activity; techniques: radial velocities
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Funding
- National Aeronautics and Space Administration
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The published Mount Wilson Doppler-shift measurements of the solar velocity field taken in 1967-1982 are revisited with a more accurate model, which includes two terms representing the meridional flow and three terms corresponding to the convective limb shift. Integration of the recomputed data over the visible hemisphere reveals significant variability of the net radial velocity at characteristic time scales of 0.1-10 years, with a standard deviation of 1.4 m s(-1). This result is supported by independent published observations. The implications for exoplanet detection include reduced sensitivity of the Doppler method to Earth-like planets in the habitable zone, and an elevated probability of false detections at periods of a few to several years.
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