Long-term Doppler Shift and Line Profile Studies of Planetary Search Target Stars

Details Long-term Doppler Shift and Line Profile Studies of Planetary Search Target Stars Long-term Doppler Shift and Line Profile Studies of Planetary Search Target Stars

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stin...0244056m&link_type=abstract

Technical Report, UA-FRS-347140 Lunar and Planetary Lab.

Physics

Doppler Effect, Main Sequence Stars, Stellar Activity, Extrasolar Planets, Photosphere, Radial Velocity, Convection, Center Of Mass, Fabry-Perot Interferometers, Fourier Transformation, Etalons

Scientific paper

This grant supported attempts to develop a method for measuring the Doppler shifts of solar-type stars more accurately. The expense of future space borne telescopes to search for solar systems like our own makes it worth trying to improve the relatively inexpensive pre-flight reconnaissance by ground-based telescopes. The concepts developed under this grant contributed to the groundwork for such improvements. They were focused on how to distinguish between extrasolar planets and stellar activity (convection) cycles. To measure the Doppler shift (radial velocity; RV) of the center of mass of a star in the presence of changing convection in the star's photosphere, one can either measure the effect of convection separately from that of the star's motion and subtract its contribution to the apparent RV, or measure the RV in a way that is insensitive to convection. This grant supported investigations into both of these approaches. We explored the use of a Fabry-Perot Etalon HE interferometer and a multichannel Fourier Transform Spectrometer (mFTS), and finished making a 1.8-m telescope operational and potentially available for this work.

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