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arXiv · 2409.11620

Updated forecast for TRAPPIST-1 times of transit for all seven exoplanets incorporating JWST data

Eric Agol·Natalie H. Allen·Björn Benneke·Laetitia Delrez·René Doyon·Elsa Ducrot·Néstor Espinoza·Amélie Gressier·David Lafrenière·Olivia Lim·Jacob Lustig-Yaeger·Caroline Piaulet-Ghorayeb·Michael Radica·Zafar Rustamkulov·Kristin S. Sotzen
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Abstract

The TRAPPIST-1 system has been extensively observed with JWST in the near-infrared with the goal of measuring atmospheric transit transmission spectra of these temperate, Earth-sized exoplanets. A byproduct of these observations has been much more precise times of transit compared with prior available data from Spitzer, HST, or ground-based telescopes. In this note we use 23 new timing measurements of all seven planets in the near-infrared from five JWST observing programs to better forecast and constrain the future times of transit in this system. In particular, we note that the transit times of TRAPPIST-1h have drifted significantly from a prior published analysis by up to tens of minutes. Our newer forecast has a higher precision, with median statistical uncertainties ranging from 7-105 seconds during JWST Cycles 4 and 5. Our expectation is that this forecast will help to improve planning of future observations of the TRAPPIST-1 planets, whereas we postpone a full dynamical analysis to future work.

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Eric Agol, Natalie H. Allen, Björn Benneke, Laetitia Delrez, René Doyon, Elsa Ducrot, Néstor Espinoza, Amélie Gressier, David Lafrenière, Olivia Lim, Jacob Lustig-Yaeger, Caroline Piaulet-Ghorayeb, Michael Radica, Zafar Rustamkulov, Kristin S. Sotzen. 2024-09-18. Updated forecast for TRAPPIST-1 times of transit for all seven exoplanets incorporating JWST data. https://arxiv.org/abs/2409.11620

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