Journal Article

Transit timing effects due to an exomoon – II

David M. Kipping

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1797-1804
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14869.x
Transit timing effects due to an exomoon – II

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In our previous paper, we evaluated the transit duration variation (TDV) effect for a co–aligned planet–moon system at an orbital inclination of i= 90°. Here, we will consider the effect for the more general case of i≤ 90° and an exomoon inclined from the planet–star plane by Euler rotation angles α, β and γ. We find that the TDV signal has two major components, one due to the velocity variation effect described in our first paper and one new component due to transit impact parameter variation. By evaluating the dominant terms, we find the two effects are additive for prograde exomoon orbits, and deductive for retrograde orbits. This asymmetry could allow for future determination of the orbital sense of motion. We re–evaluate the ratio of TDV and transit timing variation effects, η, in the more general case of an inclined planetary orbit with a circular orbiting moon and find that it is still possible to directly determine the moon's orbital separation from just the ratio of the two amplitudes, as first proposed in our previous paper.

Keywords: methods: analytical; techniques: photometric; occultations; planets and satellites: general; planetary systems

Journal Article.  5195 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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