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| Paper: |
Characterizing the Dynamics and Chemistry of Transiting Exoplanets with the Habitable World Observatory |
| Monograph: |
10, HWO25 Proceedings Part I: Community Science Case Development Documents |
| Page: |
508 |
| Authors: |
Hannah R. Wakeford; Laura C. Mayorga; Joanna K. Barstow; Natasha E. Batalha; Ludmila Carone; Sarah L. Casewell; Theodora Karalidi; Tiffany Kataria; Erin M. May; Michiel Min |
| DOI: |
10.26624/OABC5399 |
| Abstract: |
The primary scientific objective of this Habitable Worlds Observatory (HWO) Science Case Development
Document (SCDD) is to measure planetary rotation rates of transiting exoplanets to determine the structure,
composition, circulation, and aerosol properties of their planetary atmospheres. For this analysis, HWO would
obtain spectroscopic phase curves for planets with orbital periods of 5–20+ days, to assess tidal locking radius
assumptions. Extending phase curve studies out to longer orbital periods than accessible with current and
near-future telescopes will enable detailed investigation of atmospheric structure, composition, and circulation
for planets that are much cooler than the more highly irradiated planets accessible with JWST phase curve
observations (i.e., Teq < 500 K for HWO versus 1400 K ≤ Teq ≤ 2600 K for JWST). Broad wavelength
coverage extending from the UV to the NIR would capture both reflected light and thermal emission, enabling
HWO to conduct comprehensive characterization of planetary atmospheres. UV observations would probe
high altitudes, thereby providing valuable insights into atmospheric (dis)equilibrium, aerosol properties, and
the effects of photochemical processes on atmospheric composition. We also discuss the role of polarimetry
in the classification of aerosols and the associated role they play in the atmospheric energy budget that directly
ties them to the chemistry and circulation structure of the atmosphere. |
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