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- Title
Transiting planets as a precision clock to constrain the time variation of the gravitational constant.
- Authors
Kento MASUDA; Yasushi SUTO
- Abstract
Analysis of transit times in exoplanetary systems accurately provides an instantaneous orbital period, P(t), of their member planets. A long-term monitoring of those transiting planetary systems puts limits on the variability of P(t), which are translated into the constraints on the time variation of the gravitational constant G. We apply this analysis to 10 transiting systems observed by the Kepler spacecraft, and find that ∇G/G ≲5 × 10-6 for 2009-2013, or ∙G/G ≲10-6 yr-1 if ∙G is constant. While the derived limit is weaker than those from other analyses, it is complementary to them and can be improved by analyzing numerous transiting systems that are continuously monitored.
- Subjects
PLANETARY orbits; PLANETARY systems; GRAVITATIONAL constant; MICROWAVE reflectometry; KEPLER (Spacecraft)
- Publication
Publications of the Astronomical Society of Japan, 2016, Vol 68, Issue 3, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psw017