EDP Sciences
Free Access
Volume 450, Number 1, April IV 2006
Page(s) 395 - 398
Section Planets and planetary systems
DOI https://doi.org/10.1051/0004-6361:20054555
Published online 03 April 2006
A&A 450, 395-398 (2006)
DOI: 10.1051/0004-6361:20054555

Possibility of a photometric detection of "exomoons"

Gy. M. Szabó1, 2, K. Szatmáry1, Zs. Divéki1 and A. Simon1

1  Department of Experimental Physics & Astronomical Observatory, University of Szeged, 6720 Szeged, Hungary
    e-mail: szgy@titan.physx.u-szeged.hu
2  visitor at the Harvard-Smithsonian CfA, Cambridge, MA

(Received 29 November 2005 / Accepted 15 December 2005)

Aims. We examined which exo-systems contain moons that may be detected in transit.
Methods. We numerically modeled transit light curves of Earth-like and giant planets that cointain moons with 0.005-0.4 Earth-mass. The orbital parameters were randomly selected, but the entire system fulfilled Hill-stability.
Results. We conclude that the timing effect is caused by two scenarios: the motion of the planet and the moon around the barycenter. Which one dominates depends on the parameters of the system. Already planned missions (Kepler, COROT) may be able to detect the moon in transiting extrasolar Earth-Moon-like systems with a 20% probability. From our sample of 500 free-designed systems, 8 could be detected with the photometric accuracy of 0.1 mmag and a 1 min sampling, and one contains a stony planet. With ten times better accuracy, 51 detections are expected. All such systems orbit far from the central star, with the orbital periods at least 200 and 10 days for the planet and the moon, while they contain K- and M-dwarf stars. Finally we estimate that a few number of real detections can be expected by the end of the COROT and the Kepler missions.

Key words: stars: planetary systems -- techniques: photometric

© ESO 2006

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.