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American Astronomical Society, Astrophysical Journal, 1(707), p. L73-L76, 2009

DOI: 10.1088/0004-637x/707/1/l73

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Starspot Jitter in Photometry, Astrometry, and Radial Velocity Measurements

Journal article published in 2009 by V. V. Makarov, C. A. Beichman, J. H. Catanzarite, D. A. Fischer ORCID, J. Lebreton, F. Malbet ORCID, M. Shao
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Analytical relations are derived for the amplitude of astrometric, photometric and radial velocity perturbations caused by a single rotating spot. The relative power of the star spot jitter is estimated and compared with the available data for $κ^1$ Ceti and HD 166435, as well as with numerical simulations for $κ^1$ Ceti and the Sun. A Sun-like star inclined at $i=90\degr$ at 10 pc is predicted to have a RMS jitter of 0.087 \uas in its astrometric position along the equator, and 0.38 m s$^{-1}$ in radial velocities. If the presence of spots due to stellar activity is the ultimate limiting factor for planet detection, the sensitivity of SIM Lite to Earth-like planets in habitable zones is about an order of magnitude higher that the sensitivity of prospective ultra-precise radial velocity observations of nearby stars. Comment: accepted in ApJ Letters, Nov. 2009