A Ground-based Optical Transmission Spectrum of WASP-6b

Understand

We present a ground based optical transmission spectrum of the inflated sub-Jupiter mass planet WASP-6b.

• The spectrum was measured in twenty spectral channels from 480 nm to 860nm using a series of 91 spectra over a complete transit event.
• The observations were carried out using multi-object differential spectrophotometry with the IMACS spectrograph on the Baade telescope at Las Campanas Observatory.
• We model systematic effects on the observed light curves using principal component analysis on the comparison stars, and allow for the presence of short and long memory correlation structure in our Monte Carlo Markov Chain analysis of the transit light curves for WASP-6.