STARSPOT JITTER IN PHOTOMETRY, ASTROMETRY, AND RADIAL VELOCITY MEASUREMENTS
- NASA Exoplanet Science Institute, Caltech, Pasadena, CA 91125 (United States)
- JPL, Pasadena, CA 94550 (United States)
Analytical relations are derived for the amplitude of astrometric, photometric, and radial velocity (RV) perturbations caused by a single rotating spot. The relative power of the starspot jitter is estimated and compared with the available data for kappa{sup 1} Ceti and HD 166435, as well as with numerical simulations for kappa{sup 1} Ceti and the Sun. A Sun-like star inclined at i = 90 deg. at 10 pc is predicted to have an rms jitter of 0.087 muas in its astrometric position along the equator, and 0.38 m s{sup -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 than the sensitivity of prospective ultra-precise RV observations of nearby stars.
- OSTI ID:
- 21389293
- Journal Information:
- Astrophysical Journal (Online), Vol. 707, Issue 1; Other Information: DOI: 10.1088/0004-637X/707/1/L73; ISSN 1538-4357
- Country of Publication:
- United States
- Language:
- English
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