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  ACCESS: Ground-based Optical Transmission Spectroscopy of the Hot Jupiter WASP-4b

Bixel, A., Rackham, B. V., Apai, D., Espinoza, N., López-Morales, M., Osip, D., et al. (2019). ACCESS: Ground-based Optical Transmission Spectroscopy of the Hot Jupiter WASP-4b. The Astronomical Journal, 157.

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 Creators:
Bixel, Alex1, Author
Rackham, Benjamin V.1, Author
Apai, Dániel1, Author
Espinoza, Néstor1, Author
López-Morales, Mercedes1, Author
Osip, David1, Author
Jordán, Andrés1, Author
McGruder, Chima1, Author
Weaver, Ian1, Author
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1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: planets and satellites: atmospheres planets and satellites: individual: WASP-4b stars: activity starspots techniques: spectroscopic Astrophysics - Earth and Planetary Astrophysics
 Abstract: We present an optical transmission spectrum of the atmosphere of WASP-4b obtained through observations of four transits with Magellan/IMACS, as part of the Arizona-CfA-Católica-Carnegie Exoplanet Spectroscopy Survey (ACCESS). Using a Bayesian approach to atmospheric retrieval, we find no evidence for scattering or absorption features in our transit spectrum. Our models include a component to model the transit light source effect (spectral contamination from unocculted spots on the stellar photosphere), which we show can have a marked impact on the observed transmission spectrum for reasonable spot-covering fractions (<5%) this is the first such analysis for WASP-4b. We are also able to fit for the size and temperature contrast of spots observed during the second and third transits, finding evidence for both small, cool and large, warm spot-like features on the photosphere. Finally, we compare our results to those published by Huitson et al. using Gemini/GMOS and May et al. using IMACS, and we find that our data are in agreement.

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 Dates: 2019
 Publication Status: Published in print
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Title: The Astronomical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 157 Sequence Number: - Start / End Page: - Identifier: -