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SUMMARY:Unmasking hidden systems with NGTS - Max Guenther (Cambridge)
DTSTART:20180308T113000Z
DTEND:20180308T123000Z
UID:TALK98107@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:The Next Generation Transit Survey (NGTS) has been hunting for
  exoplanets from Paranal since 2016. Thereby\, its ability to identify fal
 se positives is crucial. Background eclipsing binaries (BEBs) blended in t
 he photometric aperture can mimic shallow exoplanet transits and are costl
 y in follow-up time. Moreover\, constant blends can lead to underestimatio
 n of planet radii. In this talk\, I will highlight our ability to detect f
 lux-centroid shifts with a precision down to 0.25 milli-pixel\, capable of
  identifying 80% of BEBs. Further\, I will introduce 'blendfitter'\, a nov
 el Bayesian tool box to conjointly model multi-colour photometry\, centroi
 ds\, radial velocity cross-correlation functions and their bisectors. I wi
 ll demonstrate how this method disentangled an exoplanet in an unresolved 
 binary system\, which would otherwise have been erroneously disregarded. T
 hese achievements make NGTS the first ground-based wide-field transit surv
 ey ever to successfully apply these techniques\, enabling the production o
 f a robust planet candidate list.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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