When two or more planets orbit the same star, their orbital periods can be increased or deceased (by minutes to hours) as a result of their mutual gravitational attraction as they pass each other. For transiting exoplanet systems where planetary radii are known, the corresponding observed variations in transit times provides to one of the most powerful techniques for obtaining planetary masses and, hence, densities. To date, only a handful of exoplanets’ properties have been reported via this approach (see refs. 1) because of a variety of astrophysical uncertainties as well as the mathematical complexities involved in the TTV-to-properties conversions. It is hoped that this website will foster interest by those professionals with the required skills to develop computer codes for automating the TTV-to-properties conversions…and then similarly to make such code(s) freely available. Such would be a powerful tool for accelerating our understanding of planetary systems as well as our ultimate push toward finding biology everywhere in the Universe.
In depth TTV's and short commentary on about 40 systems, with reasoned speculation as to the presence of additional planets.