期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 481, 期 3, 页码 4261-4276出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2488
关键词
planets and satellites: atmospheres; stars: fundamental parameters; stars: individual: XO-1; planetary systems
资金
- Leverhulme Trust
- Gates Cambridge Trust
- Italian Minister of Instruction, University and Research (MIUR) through FFABR 2017 fund
- Department of Physics of the University of Rome Tor Vergata, through Mission Sustainability 2016 funds
We present 10 high-precision light curves of four transits in the XO-1 planetary system, obtained using u, g, r, redshifted H alpha, 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 mu m. Our best-fitting model to this spectrum is for a H-2/He-rich atmosphere containing water (3.05 sigma confidence), nitrogen-bearing molecules NH3 and HCN (1.5 sigma) and patchy cloud (1.3 sigma). 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 g band 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(*)(1) > 10(5.6), and rule out a previously postulated sinusoidal variation in the transit times.
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