A transit timing variation observed for the long-period extremely low-density exoplanet HIP 41378 f

Journal
Date Issued
2021
Author(s)
Edward M Bryant
•
Daniel Bayliss
•
Alexandre Santerne
•
Peter J Wheatley
•
•
Elsa Ducrot
•
Artem Burdanov
•
Jack S Acton
•
Douglas R Alves
•
David R Anderson
•
David J Armstrong
•
Supachai Awiphan
•
Benjamin F Cooke
•
Matthew R Burleigh
•
Sarah L Casewell
•
Laetitia Delrez
•
Brice-Olivier Demory
•
Philipp Eigmüller
•
Akihiko Fukui
•
Tianjun Gan
•
Samuel Gill
•
Michael Gillon
•
Michael R Goad
•
Thiam-Guan Tan
•
Maximilian N Günther
•
Bronwen Hardee
•
Beth A Henderson
•
Emmanuel Jehin
•
James S Jenkins
•
Molly Kosiarek
•
Monika Lendl
•
Maximiliano Moyano
•
Catriona A Murray
•
Norio Narita
•
Prajwal Niraula
•
Caroline E Odden
•
Enric Palle
•
Hannu Parviainen
•
Peter P Pedersen
•
Francisco J Pozuelos
•
Benjamin V Rackham
•
Daniel Sebastian
•
Chris Stockdale
•
Rosanna H Tilbrook
•
Samantha J Thompson
•
Amaury H M J Triaud
•
Stéphane Udry
•
Jose I Vines
•
Richard G West
•
Julien de Wit
DOI
Abstract
HIP 41378 f is a temperate 9.2 ± 0.1 R⊕ planet with period of 542.08 d and an extremely low density of 0.09 ± 0.02 g cm-3. 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 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 h 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 TC, 4 = $2459\,355.087^{+0.031}_{-0.022}$ (2021 May) and TC, 5 = $2459\,897.078^{+0.114}_{-0.060}$ (2022 November)....
Volume
504
Issue
1
Start page
L45
Uri
Url
Issn Identifier
1745-3925
Rights
open.access
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