Using long-term transit timing to detect terrestrial planets

Details Using long-term transit timing to detect terrestrial planets Using long-term transit timing to detect terrestrial planets

2006-10-10

arxiv.org/abs/astro-ph/0610267v3

Mon.Not.Roy.Astron.Soc.377:1511-1519,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, accepted by Monthly Notices, updated to reflect accepted version

Scientific paper

10.1111/j.1365-2966.2007.11697.x

We propose that the presence of additional planets in extrasolar planetary systems can be detected by long-term transit timing studies. If a transiting planet is on an eccentric orbit then the presence of another planet causes a secular advance of the transiting planet's pericenter over and above the effect of general relativity. Although this secular effect is impractical to detect over a small number of orbits, it causes long-term differences in when future transits occur, much like the long-term decay observed in pulsars. Measuring this transit-timing delay would thus allow the detection of either one or more additional planets in the system or the first measurements of non-zero oblateness ($J_2$) of the central stars.

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