TRAPPIST-1: Global Results of the Spitzer Exploration Science Program {\it Red Worlds}
Elsa Ducrot, M. Gillon, L. Delrez, E. Agol, P. Rimmer, M. Turbet, M., N. G\"unther, B-O. Demory, A. H. M. J.Triaud, E. Bolmont, A. Burgasser, S. J., Carey, J. G. Ingalls, E. Jehin, J. Leconte, S. M. Lederer, D. Queloz, S. N., Raymond, F. Selsis, V. Van Grootel, J. de Wit

TL;DR
This study presents comprehensive analysis of over 180 transits and occultations of TRAPPIST-1 using Spitzer data, providing refined planetary transmission spectra, flare activity insights, and brightness temperature constraints, crucial for future atmospheric studies with JWST.
Contribution
The paper offers the first extensive global analysis of TRAPPIST-1 with Spitzer, including updated transmission spectra, flare characterization, and improved noise floor estimates for future JWST observations.
Findings
No new transiting planets confirmed.
Transit depth measurements have noise floors of ~35 and 25 ppm.
Brightness temperature upper limits for planets b and c are 611K and 586K.
Abstract
With more than 1000 hours of observation from Feb 2016 to Oct 2019, the Spitzer Exploration Program Red Worlds (ID: 13067, 13175 and 14223) exclusively targeted TRAPPIST-1, a nearby (12pc) ultracool dwarf star orbited by seven transiting Earth-sized planets, all well-suited for a detailed atmospheric characterization with the upcoming JWST. In this paper, we present the global results of the project. We analyzed 88 new transits and combined them with 100 previously analyzed transits, for a total of 188 transits observed at 3.6 or 4.5 m. We also analyzed 29 occultations (secondary eclipses) of planet b and eight occultations of planet c observed at 4.5 m to constrain the brightness temperatures of their daysides. We identify several orphan transit-like structures in our Spitzer photometry, but all of them are of low significance. We do not confirm any new transiting planets. We…
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