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A comparison of retrieved water abundances using the clear-atmosphere, hot-Saturn WASP-39b as a test case

MPG-Autoren

Kirk,  James
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lopez-Morales,  Mercedes
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wheatley,  Peter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Weaver,  Ian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Skillen,  Ian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Louden,  Tom
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

McCormac,  James
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Espinoza,  Nestor
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Externe Ressourcen

https://ui.adsabs.harvard.edu/abs/2019ESS.....432639K
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Zitation

Kirk, J., Lopez-Morales, M., Wheatley, P., Weaver, I., Skillen, I., Louden, T., et al. (2019). A comparison of retrieved water abundances using the clear-atmosphere, hot-Saturn WASP-39b as a test case. In AAS/Division for Extreme Solar Systems Abstracts.


Zitierlink: https://hdl.handle.net/21.11116/0000-0005-D349-B
Zusammenfassung
WASP-39b provides a benchmark test case for comparing different retrieval approaches and assumptions. It has a deep and precisely measured water feature, however, the water abundances retrieved in the literature differ by over four orders of magnitude. We will present a new analysis of all available transmission spectra of this planet in addition to a new WHT/ACAM transmission spectrum obtained through the LRG-BEASTS survey. We have run retrievals on various combinations of literature data sets and a combined transmission spectrum covering a wavelength range of 0.29 to 5.06 microns. We will highlight how different assumptions made during retrieval analyses can lead to order of magnitude differences in the retrieved water abundances, which in turn lead to different conclusions about the planet's formation. WASP- 39b is one of the very best targets for transmission spectroscopy, with a transit depth per atmospheric scale height of 450 ppm. We must understand and be aware of the impact of our assumptions before we can begin to understand the transmission spectra of targets with smaller signals.