An automated method to detect transiting circumbinary planets

Diana Windemuth, Eric Agol, Josh Carter, Eric B. Ford, Nader Haghighipour, Jerome A. Orosz, William F. Welsh

Research output: Contribution to journalArticle

Abstract

To date a dozen transiting ‘Tatooines’ or circumbinary planets (CBPs) have been discovered, by eye, in the data from the Kepler mission; by contrast, thousands of confirmed circumstellar planets orbiting around single stars have been detected using automated algorithms. Automated detection of CBPs is challenging because their transits are strongly aperiodic with irregular profiles. Here, we describe an efficient and automated technique for detecting circumbinary planets that transit their binary hosts in Kepler light curves. Our method accounts for large transit timing variations (TTVs) and transit duration variations (TDVs), induced by binary reflex motion, in two ways: (1) We directly correct for large-scale TTVs and TDVs in the light curves by using Keplerian models to approximate binary and CBP orbits; and (2) We allow additional aperiodicities on the corrected light curves by employing the Quasi-periodic Automated Transit Search algorithm. We demonstrate that our method dramatically improves detection significance using simulated data and two previously identified CBP systems, Kepler-35 and Kepler-64.

Original languageEnglish (US)
Pages (from-to)1313-1324
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume490
Issue number1
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Windemuth, D., Agol, E., Carter, J., Ford, E. B., Haghighipour, N., Orosz, J. A., & Welsh, W. F. (2019). An automated method to detect transiting circumbinary planets. Monthly Notices of the Royal Astronomical Society, 490(1), 1313-1324. https://doi.org/10.1093/mnras/stz2637