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GJ3470b is a hot Neptune exoplanet orbiting an M dwarf and the firstsub-Jovian planet to exhibit Rayleigh scattering. We present transit timingvariation (TTV) and transmission spectroscopy analyses of multi-wavelengthoptical photometry from 2.4-m and 0.5-m telescopes at the Thai NationalObservatory, and the 0.6-m PROMPT-8 telescope in Chile. Our TTV analysis allowsus to place an upper mass limit for a second planet in the system. The presenceof a hot Jupiter with a period of less than 10 days or a planet with an orbitalperiod between 2.5 and 4.0 days are excluded. Combined optical andnear-infrared transmission spectroscopy favour an H/He dominated haze (meanmolecular weight 1.08$\pm$0.20) with high particle abundance at high altitude.We also argue that previous near-infrared data favour the presence of methanein the atmosphere of GJ3470b.

Transit timing variation and transmission spectroscopy analyses of the hot Neptune GJ3470b