Transit-timing measurements with the model-independent barycenter method: Application to the LHS 6343 system

Details Transit-timing measurements with the model-independent barycenter method: Application to the LHS 6343 system Transit-timing measurements with the model-independent barycenter method: Application to the LHS 6343 system

2011-09-16

arxiv.org/abs/1109.3722v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

10 pages, 15 figures, accepted for publication in Astronomy and Astrophysics

Scientific paper

We present a model-independent technique for calculating the time of mid-transits. This technique, named "barycenter method", uses the light-curve's symmetry to determine the transit timing by calculating the transit light-curve barycenter. Unlike the other methods of calculating mid-transit timing, this technique does not depend on the parameters of the system and central star. We demonstrate the capabilities of the barycenter method by applying this technique to some known transiting systems including several \emph{Kepler} confirmed planets. Results indicate that for complete and symmetric transit lightcurves, the barycenter method achieves the same precision as other techniques, but with fewer assumptions and much faster. Among the transiting systems studied with the barycenter method, we focus in particular on LHS 6343C, a brown dwarf that transits a member of an M+M binary system, LHS 6343AB. We present the results of our analysis, which can be used to set an upper limit on the period and mass of a possible second small perturber.

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