Searching for a cometary belt around Trappist-1 with ALMA
S. Marino, M. C. Wyatt, G. M. Kennedy, M. Kama, L. Matr\`a, A. H. M., J. Triaud, Th. Henning

TL;DR
This study used ALMA observations to search for a debris belt around TRAPPIST-1, setting upper limits on dust mass and discussing implications for planetary system formation and evolution.
Contribution
First deep ALMA observations of TRAPPIST-1 aimed at detecting an exo-Kuiper belt, providing constraints on dust mass and system formation scenarios.
Findings
No dust emission detected around TRAPPIST-1.
Upper limits on dust mass suggest most solids formed planets.
Similar analysis for Proxima Cen indicates possible outer belt presence.
Abstract
Low mass stars might offer today the best opportunities to detect and characterise planetary systems, especially those harbouring close-in low mass temperate planets. Among those stars, TRAPPIST-1 is exceptional since it has seven Earth-sized planets, of which three could sustain liquid water on their surfaces. Here we present new and deep ALMA observations of TRAPPIST-1 to look for an exo-Kuiper belt which can provide clues about the formation and architecture of this system. Our observations at 0.88 mm did not detect dust emission, but can place an upper limit of 23Jy if the belt is smaller than 4 au, and 0.15 mJy if resolved and 100 au in radius. These limits correspond to low dust masses of , which are expected after 8 Gyr of collisional evolution unless the system was born with a belt of 100 km-sized planetesimals beyond 40 au…
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