The Days Drag On on WASP-121 b: Interpreting its NIRISS Spectroscopic Phase Curve with General Circulation Models

arXiv:2605.01589 · astro-ph.EP · Submitted 2026-05-02 · Read on arXiv

Robert C. Frazier, Emily Rauscher, Jared Splinter, Thomas D. Kennedy, Xianyu Tan, Vivien Parmentier, Isaac Malsky, Louis-Philippe Coulombe, Romain Allart, Nicolas B. Cowan, David Lafrenière, Ryan MacDonald, Stefan Pelletier, Lisa Dang, René Doyon, Doug Johnstone, Lisa Kaltenegger, Michael R. Meyer, Caroline Piaulet-Ghorayeb, Michael Radica, Jake D. Turner

astro-ph.EP

Submitted: 2026-05-02

Comments: Resubmission to ApJ, 25 pages, 12 figures, 2 tables

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Alignment — 6× in this paper · explained in 1 episode
• Metallicity — 3× in this paper · explained in 3 episodes
• Single Object Slitless Spectroscopy — 2× in this paper
• Abundance — 1× in this paper · explained in 1 episode
• Consistency — 1× in this paper · explained in 3 episodes
• Core — 1× in this paper · explained in 2 episodes
• Hubble Space Telescope — 1× in this paper
• Natural Sciences and Engineering Research Council — 1× in this paper
• Spectral Signature — 1× in this paper · explained in 2 episodes

Sources

• Enriched volatiles and refractories but deficient titanium on the dayside atmosphere of WASP-121b revealed by JWST/NIRISS
• Two-Dimensional Models of Microphysical Clouds on Hot Jupiters I: Cloud Properties

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