A boxfitting algorithm in the search for periodic transits
Abstract
We study the statistical characteristics of a boxfitting algorithm to analyze stellar photometric time series in the search for periodic transits by extrasolar planets. The algorithm searches for signals characterized by a periodic alternation between two discrete levels, with much less time spent at the lower level. We present numerical as well as analytical results to predict the possible detection significance at various signal parameters. It is shown that the crucial parameter is the effective signaltonoise ratio  the expected depth of the transit divided by the standard deviation of the measured photometric average within the transit. When this parameter exceeds the value of 6 we can expect a significant detection of the transit. We show that the boxfitting algorithm performs better than other methods available in the astronomical literature, especially for low signaltonoise ratios.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 August 2002
 DOI:
 10.1051/00046361:20020802
 arXiv:
 arXiv:astroph/0206099
 Bibcode:
 2002A&A...391..369K
 Keywords:

 methods: data analysis;
 stars: variables: general;
 stars: planetary systems;
 occultations;
 Astrophysics
 EPrint:
 9 pages, 12 figures and 1 table, to appear in Astronomy &