A model-independent test of the spatial variations of the Newtonian gravitational constant in some extrasolar planetary systems |
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Authors: | Lorenzo Iorio |
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Institution: | Viale Unitàdi Italia 68, 70125 Bari, Italy |
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Abstract: | In this paper, we directly constrain possible spatial variations of the Newtonian gravitational constant G over the range ≈ 0.01–5 au in various extrasolar multiplanet systems. Using the third Kepler law, we determine the quantity ΓXY= 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 Γ from unity would signal variations of G . The obtained results for η= 1 −Γ are found to be very compatible with zero within the experimental errors (η/δη≈ 0.2–0.3) . We make a comparison with an analogous test previously performed in our Solar system. |
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Keywords: | gravitation celestial mechanics ephemerides planetary systems |
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