A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f
Abstract
HIP 41378 f is a temperate planet with period of 542.08 days and an extremely low density of g cm. It transits the bright star HIP 41378 (V=8.93), making it an exciting target for atmospheric characterization including transmission spectroscopy. HIP 41378 was monitored photometrically between the dates of 2019 November 19 and November 28. We detected a transit of HIP 41378 f with NGTS, just the third transit ever detected for this planet, which confirms the orbital period. This is also the first ground-based detection of a transit of HIP 41378 f. Additional ground-based photometry was also obtained and used to constrain the time of the transit. The transit was measured to occur 1.50 hours earlier than predicted. We use an analytic transit timing variation (TTV) model to show the observed TTV can be explained by interactions between HIP 41378 e and HIP 41378 f. Using our TTV model, we predict the epochs of future transits of HIP 41378 f, with derived transit centres of T (May 2021) and T (Nov 2022).
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Cite
@article{arxiv.2104.03159,
title = {A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f},
author = {Edward M. Bryant and Daniel Bayliss and Alexandre Santerne and Peter J. Wheatley and Valerio Nascimbeni and Elsa Ducrot and Artem Burdanov and Jack S. Acton and Douglas R. Alves and David R. Anderson and David J. Armstrong and Supachai Awiphan and Benjamin F. Cooke and Matthew R. Burleigh and Sarah L. Casewell and Laetitia Delrez and Brice-Olivier Demory and Philipp Eigmüller and Akihiko Fukui and Tianjun Gan and Samuel Gill and Michael Gillon and Michael R. Goad and Thiam-Guan Tan and Maximilian N. Günther and Bronwen Hardee and Beth A. Henderson and Emmanuel Jehin and James S. Jenkins and Molly Kosiarek and Monika Lendl and Maximiliano Moyano and Catriona A. Murray and Norio Narita and Prajwal Niraula and Caroline E. Odden and Enric Palle and Hannu Parviainen and Peter P. Pedersen and Francisco J. Pozuelos and Benjamin V. Rackham and Daniel Sebastian and Chris Stockdale and Rosanna H. Tilbrook and Samantha J. Thompson and Amaury H. M. J. Triaud and Stéphane Udry and Jose I. Vines and Richard G. West and Julien de Wit},
journal= {arXiv preprint arXiv:2104.03159},
year = {2021}
}
Comments
Accepted for publication in MNRAS Letters. 6 pages, 2 figures