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A Ground-based Optical Transmission Spectrum of WASP-6b

Jordán, Andrés and Espinoza, Néstor and Rabus, Markus and Eyheramendy, Susana and Sing, David K. and Désert, Jean-Michel and Bakos, Gaspar Á. and Fortney, Jonathan J. and Lόpez-Morales, Mercedes and Maxted, Pierre F. L. and Triaud, Amaury H. M. J. and Szentgyorgyi, Andrew (2013) A Ground-based Optical Transmission Spectrum of WASP-6b. Astrophysical Journal, 778 (2). Art. No. 184. ISSN 0004-637X. doi:10.1088/0004-637X/778/2/184.

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We present a ground-based optical transmission spectrum of the inflated sub-Jupiter-mass planet WASP-6b. The spectrum was measured in 20 spectral channels from 480 nm to 860 nm using a series of 91 spectra over a complete transit event. The observations were carried out using multi-object differential spectrophotometry with the Inamori-Magellan Areal Camera and Spectrograph on the Baade Telescope at Las Campanas Observatory. We model systematic effects on the observed light curves using principal component analysis on the comparison stars and allow for the presence of short and long memory correlation structure in our Monte Carlo Markov Chain analysis of the transit light curves for WASP-6. The measured transmission spectrum presents a general trend of decreasing apparent planetary size with wavelength and lacks evidence for broad spectral features of Na and K predicted by clear atmosphere models. The spectrum is consistent with that expected for scattering that is more efficient in the blue, as could be caused by hazes or condensates in the atmosphere of WASP-6b. WASP-6b therefore appears to be yet another massive exoplanet with evidence for a mostly featureless transmission spectrum, underscoring the importance that hazes and condensates can have in determining the transmission spectra of exoplanets.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Espinoza, Néstor0000-0001-9513-1449
Sing, David K.0000-0001-6050-7645
Désert, Jean-Michel0000-0002-0875-8401
Bakos, Gaspar Á.0000-0001-7204-6727
Fortney, Jonathan J.0000-0002-9843-4354
Triaud, Amaury H. M. J.0000-0002-5510-8751
Additional Information:© 2013 American Astronomical Society. Received 2013 September 29; accepted 2013 October 21; published 2013 November 13. A.J. acknowledges support from FONDECYT project 1130857, BASAL CATA PFB-06, and the Millennium Science Initiative, Chilean Ministry of Economy (Nucleus P10-022-F). A.J., S.E., and N.E. acknowledge support from the Vicerrectoría de Investigaciόn (VRI), Pontificia Universidad Catόlica de Chile (proyecto investigaciόn interdisciplinaria 25/2011). N.E. is supported by CONICYT-PCHA/Doctorado Nacional, and M.R. is supported by FONDECYT postdoctoral fellowship 3120097. D.K.S. acknowledges support from STFC consolidated grant ST/J0016/1. J.-M.D. acknowledges funding from NASA through the Sagan Exoplanet Fellowship program administered by the NASA Exoplanet Science Institute (NExScI). A.H.M.J.T. is a Swiss National Science Foundation fellow under grant number PBGEP2-145594.
Funding AgencyGrant Number
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1130857
Chilean Ministry of Economy Millennium Science InitiativeNucleus P10-022-F
Pontificia Universidad Catόlica de Chile Vicerrectoría de Investigaciόn (VRI)25/2011
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3120097
Science and Technology Facilities Council (STFC)ST/J0016/1
NASA Exoplanet Science Institute (NExScI)UNSPECIFIED
Swiss National Science Foundation (SNSF)PBGEP2-145594
Subject Keywords:planetary systems; planets and satellites: atmospheres; techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20140107-083732637
Persistent URL:
Official Citation:A Ground-based Optical Transmission Spectrum of WASP-6b Andrés Jordán et al. 2013 ApJ 778 184
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43241
Deposited By: Ruth Sustaita
Deposited On:07 Jan 2014 17:08
Last Modified:10 Nov 2021 16:34

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