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Heat Reveals What Clouds Conceal: Global Carbon and Longitudinally Asymmetric Chemistry on LTT 9779 b

  • Authors: Reza Ashtari, Sean Collins, Jared Splinter, Kevin B. Stevenson, Vivien Parmentier, Jonathan Brande, Suman Saha, Sarah Stamer, Ian J. M. Crossfield, James S. Jenkins, K. Angelique Kahle, Joshua D. Lothringer, Nishil Mehta, Nicolas B. Cowan, Diana Dragomir, Laura Kreidberg, Mercedes López-Morales, Thomas M. Evans-Soma, Emma Esparza-Borges, Megan Weiner Mansfield, Hayley Beltz, Tansu Daylan, Olivia Venot, Jason Pero, Xi Zhang

Reza Ashtari et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 4.

Retrieved CO, CO2, H2O, and SO2 abundances for all six orbital phases. Carbon-bearing species remain prominent throughout all phases. H2O is detected in the Eastern Dayside and Dayside, but is apparently absent elsewhere. Given a lack of evidence for thermal dissociation, the H2O is still likely present in the atmosphere, but possibly concealed by higher altitude clouds, as explained in Figure 3. SO2 is tentatively present in the Western Nightside of the planet, hinting at possible photochemistry.

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