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Deep Limits on Planets Exterior to HR 8799’s Known Planetary System with the James Webb Space Telescope

  • Authors: Bryden Geoffrey, Llop-Sayson Jorge, Beichman Charles A., Balmer William O., Kammerer Jens, Leisenring Jarron M., Ygouf Marie, Krist John, Faramaz-Gorka Virginie, Greenbaum Alexandra Z., Girard Julien, Perrin Marshall, Pueyo Laurent, van der Marel Roeland, Meyer Michael, Johnstone Doug, Hodapp Klaus, Rieke Marcia

Bryden Geoffrey et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 7.

Newly acquired JWST photometry in the F356W and F444W filters (blue and red circles) is combined with photometry and spectroscopy of the four planets (black points) and fit with EXO-REM atmospheric models (black lines). Horizontal bars show the width in each photometric filter. The open blue and red circles show the flux expected from each model after convolving with the wide JWST bandpasses. While the JWST photometry is consistent with previous observations, the measured F356W fluxes tend to be lower than expectation from the L band measurements.

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