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

Abstract

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.

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Item Type:	Article
Authors/Creators:	This paper has 11 authors. You can scroll the list below to see them all or them all. Awiphan, S. Kerins, E. Pichadee, S. Komonjinda, S. Dhillon, V.S. https://orcid.org/0000-0003-4236-9642 Rujopakarn, W. Poshyachinda, S. Marsh, T.R. Reichart, D.E. Ivarsen, K.M. Haislip, J.B.
Copyright, Publisher and Additional Information:	© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record S. Awiphan, E. Kerins, S. Pichadee, S. Komonjinda, V. S. Dhillon, W. Rujopakarn, S. Poshyachinda, T. R. Marsh, D. E. Reichart, K. M. Ivarsen, J. B. Haislip; Transit timing variation and transmission spectroscopy analyses of the hot Neptune GJ3470b. Mon Not R Astron Soc 2016; 463 (3): 2574-2582 is available online at: https://doi.org/10.1093/mnras/stw2148.
Keywords:	techniques: photometric, eclipses, planets and satellites: atmospheres, planets and satellites: individual: GJ 3470b, stars: late-type, planetary systems
Dates:	Published: December 2016 Published (online): 25 August 2016 Accepted: 23 August 2016
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Funding Information:	Funder Grant number LEVERHULME TRUST (THE) IN-2013-017
Depositing User:	Symplectic Sheffield
Date Deposited:	14 Jun 2017 12:53
Last Modified:	22 Mar 2018 00:22
Published Version:	https://doi.org/10.1093/mnras/stw2148
Status:	Published
Publisher:	Oxford University Press
Refereed:	Yes
Identification Number:	10.1093/mnras/stw2148
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:117613

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

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