Mon. Not. R. Astron. Soc., 481, 4261-4276 (2018/December-2)
Physical properties and optical-infrared transmission spectrum of the giant planet XO-1 b.
SOUTHWORTH J., TREGLOAN-REED J., PINHAS A., MADHUSUDHAN N., MANCINI L. and SMITH A.M.S.
Abstract (from CDS):
We present 10 high-precision light curves of four transits in the XO-1 planetary system, obtained using u, g, r, redshifted H α, I, and z filters. We use these to measure the physical properties, orbital ephemeris, and a transmission spectrum of the planet covering the full optical wavelength range. We augment this with published HST/WFC3 observations to construct a transmission spectrum of the planet covering 0.37-1.65 µm. Our best-fitting model to this spectrum is for a H2/He-rich atmosphere containing water (3.05σ confidence), nitrogen-bearing molecules NH3 and HCN (1.5σ) and patchy cloud (1.3σ). We find that adding the optical to the near-infrared data does not lead to more precise constraints on the planetary atmosphere in this case. We conduct a detailed investigation into the effect of stellar limb darkening on our results, concluding that the choice of limb darkening law and coefficients is unimportant; such conclusions may not hold for other systems so should be reassessed for all high-quality data sets. The planet radius we measure in the gband is anomalously low and should be investigated with future observations at a higher spectral resolution. From the measured times of transit, we determine an improved orbital ephemeris, calculate a lower limit on the modified stellar tidal quality factor of Q*^ ′^ > 105.6, and rule out a previously postulated sinusoidal variation in the transit times.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
planets and satellites: atmospheres - stars: fundamental parameters - stars: individual: XO-1 - planetary systems
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