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Muted Features in the JWST NIRISS Transmission Spectrum of Hot Neptune LTT 9779b

  • Authors: Michael Radica, Louis-Philippe Coulombe, Jake Taylor, Loic Albert, Romain Allart, Björn Benneke, Nicolas B. Cowan, Lisa Dang, David Lafrenière, Daniel Thorngren, Étienne Artigau, René Doyon, Laura Flagg, Doug Johnstone, Stefan Pelletier, Pierre-Alexis Roy

Michael Radica et al 2024 The Astrophysical Journal Letters 962 .

  • Provider: AAS Journals

Caption: Figure 5.

Exploration of cloud formation in LTT 9779 b’s terminator region via a comparison of terminator PT profiles and condensation curves of prominent silicate clouds species. PT profiles were calculated self-consistently using the SCARLET framework (Benneke 2015) for three of the cases shown in Figure 4: subsolar metallicity H2O-dominated (light blue), super-solar metallicity H2O-dominated (dark blue), and super-solar metallicity CH4-dominated (red). Condensation curves are from Visscher et al. (2010) and calculated at two metallicities: 0.5× solar (dashed) and 800× solar (dotted–dashed), reflecting the sub- and super-solar metallicity models shown. The terminator temperature of LTT 9779 b is sufficiently cool to allow for silicate clouds to readily condense at millibar pressures, even for subsolar atmospheric metallicities. Note that the red and dark blue PT profiles are entirely overlapping.

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