No Consistent Atmospheric Absorption Detected for the Ultra-hot Jupiter WASP-189 b
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.
- Publication:
-
Research Notes of the American Astronomical Society
- Pub Date:
- April 2020
- DOI:
- 10.3847/2515-5172/ab88dc
- arXiv:
- arXiv:2004.06859
- Bibcode:
- 2020RNAAS...4...53C
- Keywords:
-
- Exoplanet atmospheres;
- Exoplanet astronomy;
- 487;
- 486;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Accepted as a research note to RNAAS. 3 pages, 1 figure