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

Bryant, Edward M.; Bayliss, Daniel; Santerne, Alexandre; Wheatley, Peter J.; Nascimbeni, Valerio; Ducrot, Elsa; Burdanov, Artem; Acton, Jack S.; Alves, Douglas R.; Anderson, David R.; Armstrong, David J.; Awiphan, Supachai; Cooke, Benjamin F.; Burleigh, Matthew R.; Casewell, Sarah L.; Delrez, Laetitia; Demory, Brice-Olivier; Eigmüller, Philipp; Fukui, Akihiko; Gan, Tianjun; Gill, Samuel; Gillon, Michael; Goad, Michael R.; Tan, Thiam-Guan; Günther, Maximilian N.; Hardee, Bronwen; Henderson, Beth A.; Jehin, Emmanuel; Jenkins, James S.; Kosiarek, Molly; Lendl, Monika; Moyano, Maximiliano; Murray, Catriona A.; Narita, Norio; Niraula, Prajwal; Odden, Caroline E.; Palle, Enric; Parviainen, Hannu; Pedersen, Peter P.; Pozuelos, Francisco J.; V Rackham, Benjamin; Sebastian, Daniel; Stockdale, Chris; Tilbrook, Rosanna H.; Thompson, Samantha J.; Triaud, Amaury H. M. J.; Udry, Stéphane; Vines, Jose I.; West, Richard G.; de Wit, Julien
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society

Fecha de publicación:
6
2021
Número de autores
50
Número de autores del IAC
4
Número de citas
19
Número de citas referidas
19
Descripción
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 355.087-0.022+0.031 (2021 May) and TC, 5 = 2459 897.078-0.060+0.114 (2022 November).
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