Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986plas.rept..143d&link_type=abstract
In NASA, Washington Reports of Planetary Astronomy, 1985 p 143-144 (SEE N87-12407 03-89)
Astronomy and Astrophysics
Astronomy
Fourier Transformation, Laser Spectroscopy, Light Speed, Spectral Reflectance, Stellar Spectra, Doppler Effect, Planetary Orbits, Solar Cycles
Scientific paper
The Sun-as-a-star was monitored using the McMath Fourier transform spectometer (FTS) on Kitt Peak in 1983. In 1985 the first measurement was made using the laser heterodyne technique. The FTS measurements now extend for three years, with errors of order 3 meters/sec at a given epoch. Over this 3 year period, a 33 meter/sec change was measured in the apparent velocity of integrated sunlight. The sense of the effect is that a greater blueshift is seen near solar minimum, which is consistent with expectations based on considering the changing morphology of solar granular convection. Presuming this effect is solar-cycle-related, it will mimic the Doppler reflex produced by a planetary companion of approximately two Jupiter masses, with an 11 year orbital period. Thus, Jupiter itself is below the threshold for detection by spectroscopic means, without an additional technique for discrimination. However, for planetary companions in shorter period orbits (P approx. 3 years) the threshold for unambiguous detection is well below one Jupiter mass.
Deming Drake
Espenak Fred
Hillman John J.
Jennings Donald E.
Kostiuk Theodor,
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