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2013MNRAS.429.2052B - Mon. Not. R. Astron. Soc., 429, 2052-2068 (2013/March-1)
The impact of red noise in radial velocity planet searches: only three planets orbiting GJ 581?
BALUEV R.V.
Abstract (from CDS):
Using this method we prove that (i) planets b and c do exist in this system, since they can be independently detected in the HARPS and Keck data, and regardless of the assumed noise models; (ii) planet e can also be confirmed independently by both the data sets, although to reveal it in the Keck data it is mandatory to take the red noise into account; (iii) the recently announced putative planets f and g are likely just illusions of the red noise; (iv) the reality of the planet candidate GJ 581 d is questionable, because it cannot be detected from the Keck data, and its statistical significance in the HARPS data (as well as in the combined data set) drops to a marginal level of ∼ 2σ, when the red noise is taken into account.
Therefore, the current data for GJ 581 really support the existence of no more than four (or maybe even only three) orbiting exoplanets. The planet candidate GJ 581 d requests serious observational verification.
Abstract Copyright: © 2012 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society (2012)
Journal keyword(s): methods: data analysis - methods: statistical - techniques: radial velocities - surveys - stars: individual: GJ 581 - planetary systems
Simbad objects: 8
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