Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2010-08-31
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
ApJ, accepted
Scientific paper
Radial-velocity planet search campaigns are now beginning to detect low-mass "Super-Earth" planets, with minimum masses M sin i < 10 M_earth. Using two independently-developed methods, we have derived detection limits from nearly four years of the highest-precision data on 24 bright, stable stars from the Anglo-Australian Planet Search. Both methods are more conservative than a human analysing an individual observed data set, as is demonstrated by the fact that both techniques would detect the radial velocity signals announced as exoplanets for the 61 Vir system in 50% of trials. There are modest differences between the methods which can be recognised as arising from particular criteria that they adopt. What both processes deliver is a quantitative selection process such that one can use them to draw quantitative conclusions about planetary frequency and orbital parameter distribution from a given data set. Averaging over all 24 stars, in the period range P<300 days and the eccentricity range 0.0
Bailey Jeremy
Butler Paul R.
Carter Brad D.
Jones Hugh R. A.
O'Toole Simon J.
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