Carter, AL, Nikolov, N, Sing, DK, Alam, MK, Goyal, JM, Mikal-Evans, T, Wakeford, HR, Henry, GW, Morrell, S, López-Morales, M, Smalley, B, Lavvas, P, Barstow, JK, García Muñoz, A, Gibson, NP and Wilson, PA (2020) Detection of Na, K, and H2O in the hazy atmosphere of WASP-6b. Monthly Notices of the Royal Astronomical Society, 494 (4). 5449 - 5472. ISSN 0035-8711

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We present new observations of the transmission spectrum of the hot Jupiter WASP-6b both from the ground with the Very Large Telescope FOcal Reducer and Spectrograph (FORS2) from 0.45 to 0.83 μm, and space with the Transiting Exoplanet Survey Satellite from 0.6 to 1.0 μm and the Hubble Space Telescope (HST) Wide Field Camera 3 from 1.12 to 1.65 μm. Archival data from the HST Space Telescope Imaging Spectrograph (STIS) and Spitzer are also re-analysed on a common Gaussian process framework, of which the STIS data show a good overall agreement with the overlapping FORS2 data. We also explore the effects of stellar heterogeneity on our observations and its resulting implications towards determining the atmospheric characteristics of WASP-6b. Independent of our assumptions for the level of stellar heterogeneity we detect Na i, K i, and H2O absorption features and constrain the elemental oxygen abundance to a value of [O/H] ≃ −0.9 ± 0.3 relative to solar. In contrast, we find that the stellar heterogeneity correction can have significant effects on the retrieved distributions of the [Na/H] and [K/H] abundances, primarily through its degeneracy with the sloping optical opacity of scattering haze species within the atmosphere. Our results also show that despite this presence of haze, WASP-6b remains a favourable object for future atmospheric characterization with upcoming missions such as the James Webb Space Telescope.

Item Type: Article
Additional Information: Commercial publishers may both publish their own journals and publish journals on behalf of learned societies and other client organisations. They normally control the rights for their own journals, and may control the rights for the journals of client organisations. However, some client organisations retain their rights. The link and any additional information required with regards to this article can be found at;
Uncontrolled Keywords: techniques: photometric, techniques: spectroscopic, planets and satellites: atmospheres, planets and satellites: composition, stars: activity
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 22 May 2020 10:53
Last Modified: 22 May 2020 10:53

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