Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2006-12-10
Mon.Not.Roy.Astron.Soc.376:1727-1730,2007
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
LaTex, 9 pages, no figures, 5 tables, 37 references. Thanks to Paolo Salucci for his important remarks on MOND. To appear in M
Scientific paper
10.1111/j.1365-2966.2007.11542.x
In this paper we directly constrain possible spatial variations of the Newtonian gravitational constant G over ranges 0.01-5 AU in various extrasolar multi-planet systems. By means of the third Kepler's law we determine the quantity \Gamma_ XY=G_X/G_Y for each couple of planets X and Y located at different distances from their parent star: deviations of the measured values of \Gamma from unity would signal variations of G. The obtained results for \eta=1-\Gamma are found to be well compatible with zero within the experimental errors (\eta/\delta\eta= 0.2-0.3). A comparison with an analogous test previously performed in our Solar System is made.
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