Chris Fox's research while affiliated with The University of Western Ontario and other places

Publications (6)

Article
The Near Earth Object Surveillance Satellite (NEOSSat) is a Canadian-led 15 cm Earth-orbiting telescope originally designed to detect asteroids near the Sun. Its design is however also suitable for the observation of exoplanetary transits of bright stars. We used the NEOSSat platform to perform followup observations of several Transiting Exoplanets...
Preprint
The Near Earth Object Surveillance Satellite (NEOSSat) is a Canadian-led 15 cm Earth-orbiting telescope originally designed to detect asteroids near the Sun. Its design is however also suitable for the observation of exoplanetary transits of bright stars. We used the NEOSSat platform to perform followup observations of several Transiting Exoplanets...
Article
If a transiting exoplanet has a moon, that moon could be detected directly from the transit it produces itself, or indirectly via the transit timing variations it produces in its parent planet. There is a range of parameter space where the Kepler Space Telescope is sensitive to the TTVs exomoons might produce, though the moons themselves would be t...
Preprint
If a transiting exoplanet has a moon, that moon could be detected directly from the transit itproduces itself, or indirectly via the transit timing variations it produces in its parent planet. There is a range of parameter space where the Kepler Space Telescope is sensitive to the TTVs exomoons might produce, though the moons themselves would be to...
Article
The Kepler Space Telescope has discovered thousands of planets via the transit method. The transit timing variations of these planets allows us not only to infer the existence of other planets, transiting or not, but to characterize a number of parameters of the system. Using the transit timing variations of the planets Kepler-159b and 159c, the tr...
Preprint
The Kepler Space Telescope has discovered thousands of planets via the transit method. The transit timing variations of these planets allows us not only to infer the existence of other planets, transiting or not, but to characterize a number of parameters of the system. Using the transit timing variations of the planets Kepler-159b and 159c, the tr...

Citations

... Derivatives of the transit method involving the effect of the exomoon on the companion exoplanet, such as the transit-timing variation (TTV, Sartoretti & Schneider 1999;Szabó et al. 2006), and the transit-duration variation (Kipping 2009) have been proposed for the detection of exomoons. However, the amplitude of these effects is extremely small for sub-Earth mass exomoons and so far no confirmed exomoon candidate has been detected using these techniques (Fox & Wiegert 2021;Kipping 2020Kipping , 2021. Several other techniques have also been proposed for the detection of exomoons, such as photometric orbital sampling effect (Heller 2014;, imaging of mutual transits (Cabrera & Schneider 2007), microlensing (Han & Han 2002), spectroscopy (Williams & Knacke 2004;Johnson & Huggins 2006;Oza et al. 2019), polarimetry of selfluminous exoplanets (Sengupta & Marley 2016), Doppler monitoring of direct images of exoplanets (Agol et al. 2015), pulsar timing (Lewis et al. 2008), and radio emissions of giant exoplanets (Noyola et al. 2014(Noyola et al. , 2016. ...
... This code uses a timestep less than 1/20th of the period of the innermost planet in all cases, and includes post-Newtonian general relativistic effects. This is the same code as used in Fox & Wiegert (2019). In cases where the stability of moons is examined, the RADAU15 (Everhart 1985) algorithm is used, with a tolerance of 10 −12 . ...