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arXiv · 2004.06859

No consistent atmospheric absorption detected for the ultra-hot Jupiter WASP-189 b

P. Wilson Cauley·Evgenya Shkolnik·Ilya Ilyin·Klaus G. Strassmeier·Seth Redfield·Adam G. Jensen
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Abstract

We observed a partial transit of the ultra-hot Jupiter WASP-189 b with PEPSI on the LBT. We detect a highly variable transit signal in multiple atomic transitions, including H-alpha, Fe I, and Mg I. The signal is not consistent with a transiting planetary atmosphere. We suggest instead that the in-transit signal is due to an inhomogeneous stellar surface. Our observations demonstrate the lack of a highly extended atmosphere in common optical atomic tracers. Although WASP-189 is very bright, atmospheric characterization of the planet will be difficult due to the small transit depth and apparently compact atmosphere.

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P. Wilson Cauley, Evgenya Shkolnik, Ilya Ilyin, Klaus G. Strassmeier, Seth Redfield, Adam G. Jensen. 2020-04-15. No consistent atmospheric absorption detected for the ultra-hot Jupiter WASP-189 b. https://arxiv.org/abs/2004.06859

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