Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.212..281c&link_type=abstract
Astrophysics and Space Science, vol. 212, nos. 1-2, p. 281-291
Astronomy and Astrophysics
Astrophysics
33
Extrasolar Planets, Gravitational Effects, Orbit Perturbation, Radial Velocity, Stellar Orbits, Velocity Measurement, Absorption Spectra, Detection, F Stars, G Stars, Iodine, K Stars, Precision, Searching
Scientific paper
The precise measurement of variations in stellar radial velocities provides one of several promising methods of surveying a large sample of nearby solar type stars to detect planetary systems in orbit around them. The McDonald Observatory Planetary Search (MOPS) was started in 1987 September with the goal of detecting other nearby planetary systems. A stabilized I2 gas absorption cell placed in front of the entrance slit to the McDonald Observatory 2.7 m telescope coude spectrograph serves as the velocity metric. With this I2 cell we can achieve radial velocity measurement precision better than 10 m/s in an individual measurement. At this level we can detect a Jupiter-like planet around a solar-type star, and have some hope of detecting Saturn-like planets in a long-term survey. The detectability of planets is ultimately limited by stellar pulsation modes and photospheric motions. Monthly MOPS observing runs allow us to obtain at least 5 independent observations per year of the 33 solar-type (F5-K7) stars on our observing list. We present representative results from the first five years of the survey.
Cochran William D.
Hatzes Artie P.
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