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WASP-106 b


The exoplanet WASP-106 b belongs to a small group of transiting Jupiter-like planets on a relatively wide orbits discovered from the ground (Smith et al. 2014). This warm Jupiter has a mass of 2 M_Jup and needs over 9 days to orbit its host star. A long orbital period, long duration of a transit event of 5 hours, and transit depth of only 8 mmag make follow-up observations challenging from the ground. Few complete transits are observable each year from a given site. The literature data clearly show that new high-precision transit observations are desired to learn system parameters with higher precision.

Our reanalysis of the literature data (RV and timing datasets) indicates that there are possible scenarios, which mimic the non-zero orbital eccentricity of WASP-106 b. A dynamical (Newtonian) model shows that two-planet scenarios with circular orbits can give fits of the similar goodness to that one of a single planet on the eccentric orbit. Those scenarios assume the existence of an additional planet in or close to the inner 2:1 resonance.

The mass of the hypothetical additional planet is about 0.13 M_Jup. If it is a transiting planet, it could produce a flux drop up to 2-3 mmag if a low planetary density is assumed. Such a signal could not be detected by a small-aperture telescopes of the SuperWASP survey, but could be detected with 1.5 m telescopes.

New transits observations for the known planet WASP-106 b will help determine its physical properties more accurately, refine a transit ephemeris, and check for any signatures of departure from a strict periodicity that could be a sign of dynamical perturbations. Our observations, which were acquired with the 1.5 m telescope at the Sierra Nevada Observatory, give a strong hint that there are variations in transit times. This finding supports our previous hypothesis and allowed us to refine transit predictions for planet c. WASP-106 is our strong candidate for a compact planetary system with a Jupiter-like planet.


No conclusive results so far.


The campaign is extended until 2017. Only high-quality data (>1 m mirrors) in filters are needed (please do not use a clear filter).


No. Date Instrument Comment
1 2015 Mar 13 OSN 1.5 m partial
1 2016 Feb 01 OSN 1.5 m not perfect weather conditions


PI: Gracjan Maciejewski

wasp106.1474150284.txt.gz · Last modified: 2017/02/21 10:23 (external edit)
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