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

Awiphan, S.; Kerins, E.; Pichadee, S.; Komonjinda, S.; Dhillon, V. S.; Rujopakarn, W.; Poshyachinda, S.; Marsh, T. R.; Reichart, D. E.; Ivarsen, K. M.; Haislip, J. B.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 463, Issue 3, p.2574-2582

Fecha de publicación:
12
2016
Número de autores
11
Número de autores del IAC
1
Número de citas
30
Número de citas referidas
28
Descripción
GJ3470b is a hot Neptune exoplanet orbiting an M dwarf and the first sub-Jovian planet to exhibit Rayleigh scattering. We present transit timing variation (TTV) and transmission spectroscopy analyses of multiwavelength optical photometry from 2.4-m and 0.5-m telescopes at the Thai National Observatory, and the 0.6-m PROMPT-8 telescope in Chile. Our TTV analysis allows us to place an upper mass limit for a second planet in the system. The presence of a hot Jupiter with a period of less than 10 d or a planet with an orbital period between 2.5 and 4.0 d are excluded. Combined optical and near-infrared transmission spectroscopy favour an H/He-dominated haze (mean molecular weight 1.08 ± 0.20) with high particle abundance at high altitude. We also argue that previous near-infrared data favour the presence of methane in the atmosphere of GJ3470b.