posted on 2021-05-26, 10:43authored byEdward M Bryant, Daniel Bayliss, Alexandre Santerne, Peter J Wheatley, Valerio Nascimbeni, 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 HMJ Triaud, Stéphane Udry, Jose I Vines, Richard G West, Julien de Wit
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 = 2459355.087+0.031−0.022 (2021 May) and TC, 5 = 2459897.078+0.114−0.060 (2022 November).
History
Citation
Monthly Notices of the Royal Astronomical Society: Letters, Volume 504, Issue 1, June 2021, Pages L45–L50, https://doi.org/10.1093/mnrasl/slab037
Author affiliation
Department of Physics and Astronomy
Version
VoR (Version of Record)
Published in
Monthly Notices of the Royal Astronomical Society: Letters
Volume
504
Issue
1
Pagination
L45-L50
Publisher
Oxford University Press (OUP) for Royal Astronomical Society