VLT, GROND, AND DANISH TELESCOPE OBSERVATIONS OF TRANSITS IN THE TRAPPIST-I SYSTEM
Journal
OBSERVATORY
Date Issued
2022
Author(s)
Haikala, L. K.
Southworth, John
Mancini, L.
Dominik, M.
Jorgensen, U. G.
Bozza, V
Burgdorf, M. J.
Jaimes, R. Figuera
University of Atacama
Henning, Th
Hinse, T. C.
Hundertmark, M.
Longa-Pena, P.
Rabus, M.
Rahvar, S.
Sajadian, S.
Skottfelt, J.
Snodgrass, C.
Abstract
TRAPPIST-I is an ultra-cool dwarf that hosts seven known transiting planets. We present photometry of the system obtained using three telescopes at ESO La Silla (the Danish 1.54-m telescope and the 2.2-m MPI telescope) and Paranal (Unit Telescope I of the Very Large Telescope). We obtained I8 light-curves from the Danish telescope, eight from the 2.2-m and four from the VLT. From these we measure 25 times of mid-transit for four of the planets (b, c, f, g). These light-curves and times of mid-transit will be useful in determining the masses and radii of the planets, which show variations in their transit times due to gravitational interactions.