Revisiting and refining the model of TRAPPIST-1 with Spitzer

Abstract : With the Spitzer Space Telescope, we have discovered a system of seven transiting planets about the star TRAPPIST-1, and for the first time measured the densities of three Earth-sized, temperate exoplanets using transit-timing variations (Gillon et al. 2017; Ducrot et al. 2018; Grimm et al. 2018). We propose to gather additional transits of the TRAPPIST-1 system, focusing on the outer planets in the system which have had fewer transits observed to date. The four-fold goals of this proposal are: i). to flag potential transits which might be affected by stellar variability; ii). to constrain the dynamical state of the planet system; iii). to better constrain the masses of the planets; iv). to tighten the ephemeris forecast for observations with JWST. In addition, we will search for any evidence an eighth planet, characterize the stellar variability, and forecast planet-planet overlaps during transits. The proposed observations contain measurements which are only possible in March-April 2019, and so we request a time critical review to the extent possible.
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https://hal.archives-ouvertes.fr/hal-02079563
Contributor : Marie-Paule Pomies <>
Submitted on : Tuesday, March 26, 2019 - 10:43:25 AM
Last modification on : Tuesday, May 14, 2019 - 1:04:33 PM

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Eric Agol, Sean Carey, Laetitia Delrez, Brice-Olivier Demory, Dan Fabrycky, et al.. Revisiting and refining the model of TRAPPIST-1 with Spitzer. 2019. ⟨hal-02079563⟩

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