Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991plas.rept...37d&link_type=abstract
In NASA, Washington, Reports of Planetary Astronomy, 1991 p 37-38 (SEE N92-12792 03-89)
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Doppler Effect, Extrasolar Planets, Infrared Spectra, Near Infrared Radiation, Stellar Spectra, Sunlight, Calibrating, Detection, Fourier Transformation, Nitrogen Oxides, Solar Activity, Solar Cycles
Scientific paper
One of the most promising methods for the detection of extra-solar planets is the spectroscopic method, where a small Doppler shift (approx. 10 meter/sec) in the spectrum of the parent star reveals the presence of planetary companions. However, solar type stars may show spurious Doppler shifts due to surface activity. If these effects are periodic, as is the solar activity cycle, then they may masquerade as planetary companions. The goal of this study was to determine whether the solar cycle affects the Doppler stability of integrated sunlight. Observations of integrated sunlight were made in the near infrared (approx. 2 micron), using the Kitt Peak McMath Fourier transform spectrometer, with a N2O gas absorption cell for calibration. An accuracy of approx. 5 meter/sec was achieved.
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