Exoplanet Transit Parallax

Details Exoplanet Transit Parallax Exoplanet Transit Parallax

2007-02-28

arxiv.org/abs/astro-ph/0702749v1

Astrophys.J.661:1218-1221,2007

Astronomy and Astrophysics

Astrophysics

12 Pages, 3 Figures, Accepted for publication in ApJ

Scientific paper

10.1086/517504

The timing and duration of exoplanet transits has a dependency on observer position due to parallax. In the case of an Earth-bound observer with a 2 AU baseline the dependency is typically small and slightly beyond the limits of current timing precision capabilities. However, it can become an important systematic effect in high-precision repeated transit measurements for long period systems due to its relationship to secular perspective acceleration phenomena. In this short paper we evaluate the magnitude and characteristics of transit parallax in the case of exoplanets using simplified geometric examples. We also discuss further implications of the effect, including its possible exploitation to provide immediate confirmation of planetary transits and/or unique constraints on orbital parameters and orientations.

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