Potential biases in the detection of planets with TTVs

Details Potential biases in the detection of planets with TTVs Potential biases in the detection of planets with TTVs

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..406l&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.406

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Scientific paper

The Transit Timing Variations (TTVs) technique is a powerful tool to detect additional planets in transiting systems, however planets with large TTVs could be missed by current transit search algorithms. If the period of the TTVs, PTTV , is longer than the time baseline of the observations and its amplitude, ATTV , larger than the timing precision of the data, transiting planet candidates are detected, but with incorrect ephemerides. If PTTV is shorter than the observations time span and ATTV is large enough, constant period search algorithms find an average period for the system, and altered transit durations and depths once light curves are folded. Also, for a large enough ATTV , the transits can get diluted by photometric dispersion. Such detection biases could explain the observed statistical differences between the number of multiple systems among planets detected via other techniques and those detected via transits.

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