No evidence of the planet orbiting the extremely metal-poor extragalactic star HIP13044
Authors:
Jones et al
Abstract:
The recent discovery of three giant planets orbiting the extremely metal-poor stars HIP11952 and HIP13044 have challenged theoretical predictions of the core-accretion model. According to this, the metal content of the protoplanetary disk from which giant planets are formed is a key ingredient for the early formation of planetesimals prior to the runaway accretion of the surrounding gas.
AIMS: We reanalyzed the original FEROS data that were used to detect the planets to prove or refute their existence, employing our
new reduction and analysis methods.
METHOD: We applied the cross-correlation technique to FEROS spectra to measure the radial velocity variation of HIP13044 and HIP11952. We reached a typical precision of ∼ 35 \ms\, for HIP13044 and ∼ 25 \ms\, for HIP11952, which is significantly superior to the uncertainties presented previously.
RESULTS: We found no evidence of the planet orbiting the metal-poor extragalactic star HIP13044. We show that given our radial velocity precision, and considering the large number of radial velocity epochs, the probability for a non-detection of the radial velocity signal recently claimed is lower than 10−4. Finally, we also confirm findings that the extremely metal-poor star HIP11952 does not contain a system of two gas giant planets. These results reaffirm the expectations from the core-accretion model of planet formation.
Monday, January 13, 2014
HIP13044 Does NOT Have an Exoplanet
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1 comment:
Well, that's a disappointment. A minor one given the present larger context, mind you, but still...
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