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Time-resolved transmission spectroscopy of the ultra-hot Jupiter WASP-189 b

Presentation #200.03 in the session Exoplanet Atmospheres: Giant Planets (Oral Presentation)

Published onOct 23, 2023
Time-resolved transmission spectroscopy of the ultra-hot Jupiter WASP-189 b

Ground-based high-resolution spectrographs on large telescopes make it possible to study the atmospheres of hot gas giant planets on relatively short orbits in great detail. Today, one can not only determine the composition of the atmosphere or make statements about the global dynamics, but it is also becoming possible to study the absorption in a time-resolved manner: By combining several transit observations, the signal-to-noise ratio is increased to such an extent that we can study the change in absorption depth over the course of the transit. As the planet moves in front of the host star, different regions of the atmosphere become accessible, which in turn dominate the observed absorption feature. Most signal strengths are expected to increase during the transit due to the increased atmospheric scale height at the hotter rear terminator. However, for some species, the signals may also weaken due to the ionisation of atoms and their ions or the dissociation of molecules on the dayside.

In this talk, I will present time-resolved transmission spectroscopy on the ultra-hot Jupiter WASP-189 b where we have combined 8 transit observations obtained with four different spectrographs around the world. Our results indicate that different species must originate from different regions of the tidally-locked atmosphere to explain the observed time dependence of the signals.

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