# TRAPPIST-1: Global results of the Spitzer Exploration Science Program Red Worlds

@article{Ducrot2020TRAPPIST1GR,
title={TRAPPIST-1: Global results of the Spitzer Exploration Science Program Red Worlds},
author={Elsa Ducrot and Micha{\"e}l Gillon and Laetitia Delrez and Eric Agol and Paul B. Rimmer and Martin Turbet and Maximilian N. G{\"u}nther and B-O. Demory and Amaury H. M. J. Triaud and {\'E}meline Bolmont and Adam J. Burgasser and Sean Carey and James G. Ingalls and Emmanuel Jehin and J{\'e}r{\'e}my Leconte and Susan M. Lederer and Didier Queloz and Sean N. Raymond and Franck Selsis and Val{\'e}rie Van Grootel and Julien de Wit},
journal={arXiv: Earth and Planetary Astrophysics},
year={2020}
}
• Published 24 June 2020
• Geology, Physics
• arXiv: Earth and Planetary Astrophysics
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…
Constraining the dynamics and masses of the TRAPPIST-1 planets with the transit timing variations method
Tous les documents placés en accès ouvert sur le site le site MatheO sont protégés par le droit d'auteur. Conformément aux principes énoncés par la "Budapest Open Access Initiative"(BOAI, 2002),
Improved Constraints for the XUV Luminosity Evolution of Trappist-1
• Physics
Research Notes of the AAS
• 2021
We re-examine the XUV luminosity evolution of TRAPPIST-1 utilizing new observational constraints (XUV and bolometric luminosity) from multi-epoch X-ray/UV photometry. Following the formalism
A Review of Possible Planetary Atmospheres in the TRAPPIST-1 System
• Physics, Geology
Space science reviews
• 2020
It is shown that (i) Hubble Space Telescope transit observations, (ii) bulk density measurements comparison with H2-rich planets mass-radius relationships, (iii) atmospheric escape modelling, and (iv) gas accretion modelling altogether offer solid evidence against the presence of hydrogen-dominated—cloud-free and cloudy—atmospheres around TRAPPIST-1 planets.
Refining the Transit-timing and Photometric Analysis of TRAPPIST-1: Masses, Radii, Densities, Dynamics, and Ephemerides
• Geology, Physics
• 2020
We have collected transit times for the TRAPPIST-1 system with the Spitzer Space Telescope over four years. We add to these ground-based, HST, and K2 transit-time measurements, and revisit an N-body
Timescales for Prebiotic Photochemistry Under Realistic Surface Ultraviolet Conditions
• Biology
Astrobiology
• 2021
Investigation of whether the UV flux available on the surface of early Earth, given a favorable atmosphere, can facilitate a variety of prebiotic chemical syntheses suggests the plausibility of the photoproduction of purine deoxyribonucleotides, which proceeds more efficiently in the presence of bisulfite.
An upper limit on late accretion and water delivery in the TRAPPIST-1 exoplanet system
• Geology, Physics
Nature Astronomy
• 2021
The TRAPPIST-1 system contains seven roughly Earth-sized planets locked in a multiresonant orbital configuration 1 , 2 , which has enabled precise measurements of the planets’ masses and constrained
Characterisation of the hydrospheres of TRAPPIST-1 planets
• Geology, Physics
• 2021
Planetary mass and radius data are showing a wide variety in densities of low-mass exoplanets. This includes sub-Neptunes, whose low densities can be explained with the presence of a volatile-rich
Confirmation of a Dynamical Model for the TRAPPIST-1 Exoplanetary System
• Physics, Geology
Research Notes of the AAS
• 2021
We present a new transit of TRAPPIST-1 d from 2021 August 25. The measured mid-point of this transit agrees with the prediction from a recently published dynamical model for the TRAPPIST-1 system and

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Context. New estimates of the masses and radii of the seven planets orbiting the ultracool M-dwarf TRAPPIST-1 star permit improved modelling of their compositions, heating by tidal dissipation, and
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