Exoplanets & Exomoons

Searching for Small Circumbinary Planets I. The STANLEY Automated Algorithm and No New Planets in Existing Systems

By Keith Cowing
astro-ph.EP
January 11, 2021
Filed under
Searching for Small Circumbinary Planets I. The STANLEY Automated Algorithm and No New Planets in Existing Systems
Circumbinary planets
SpaceRef/NASA

No circumbinary planets have been discovered smaller than 3 Earth radii, yet planets of this small size comprise over 75% of the discoveries around single stars.

The observations do not prove the non-existence of small circumbinary planets, but rather they are much harder to find than around single stars, because their transit timing variations are much larger than the transit durations. We present STANLEY: an automated algorithm to find small circumbinary planets. It employs custom methods to detrend eclipsing binary light curves and stack shallow transits of variable duration and interval using N-body integrations.

Applied to the Kepler circumbinaries, we recover all known planets, including the three planets of Kepler-47, and constrain the absence of additional planets of similar or smaller size. We also show that we could have detected < 3 Earth radii planets in half of the known systems. Our work will ultimately be applied to a broad sample of eclipsing binaries to (hopefully) produce new discoveries, and derive a circumbinary size distribution which can be compared to that for single stars. David V. Martin, Daniel C. Fabrycky Comments: Under review at ApJ after responding to first referee report. 32 pages. 17 figures (some pretty)
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2101.03186 [astro-ph.EP] (or arXiv:2101.03186v1 [astro-ph.EP] for this version)
Submission history
From: David Martin V
[v1] Fri, 8 Jan 2021 19:07:52 UTC (23,215 KB)
https://arxiv.org/abs/2101.03186
Astrobiology

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻