Planet formation and dynamics

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A weak spectral signature of water vapour in the atmosphere of HD 179949 b at high spectral resolution in the L-band

(2020)

Authors:

Rebecca K Webb, Matteo Brogi, Siddharth Gandhi, Michael R Line, Jayne L Birkby, Katy L Chubb, Ignas AG Snellen, Sergey N Yurchenko
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Non–adiabatic tidal oscillations induced by a planetary companion

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2019)

Authors:

Andrew Bunting, John CB Papaloizou, Caroline Terquem

Abstract:

Abstract We calculate the dynamical tides raised by a close planetary companion on non–rotating stars of 1 M⊙ and 1.4 M⊙. Using the Henyey method, we solve the fully non–adiabatic equations throughout the star. The horizontal Lagrangian displacement is found to be 10 to 100 times larger than the equilibrium tide value in a thin region near the surface of the star. This is because non–adiabatic effects dominate in a region that extends from below the outer edge of the convection zone up to the stellar surface, and the equilibrium tide approximation is inconsistent with non–adiabaticity. Although this approximation generally applies in the low frequency limit, it also fails in the parts of the convection zone where the forcing frequency is small but larger than the Brunt-Väisälä frequency. We derive analytical estimates which give a good approximation to the numerical values of the magnitude of the ratio of the horizontal and radial displacements at the surface. The relative surface flux perturbation is also significant, on the order of 0.1% for a system modelled on 51 Pegasi b. Observations affected by the horizontal displacement may therefore be more achievable than previously thought, and brightness perturbations may be the result of flux perturbations rather than due to the radial displacement. We discuss the implication of this on the possibility of detecting such tidally excited oscillations, including the prospect of utilising the large horizontal motion for observations of systems such as 51 Pegasi.
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Non-adiabatic tidal oscillations induced by a planetary companion

(2019)

Authors:

Andrew Bunting, John CB Papaloizou, Caroline Terquem
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ESA Voyage 2050 White Paper: Detecting life outside our solar system with a large high-contrast-imaging mission

arXiv e-prints (2019) arXiv:1908.01803-arXiv:1908.01803

Authors:

Ignas Snellen, Simon Albrecht, Guillem Anglada-Escude, Isabelle Baraffe, Pierre Baudoz, Willy Benz, Jean-Luc Beuzit, Beth Biller, Jayne Birkby, Anthony Boccaletti, Roy van Boekel, Jos de Boer, Matteo Brogi, Lars Buchhave, Ludmila Carone, Mark Claire, Riccardo Claudi, Brice-Olivier Demory, Jean-Michel Desert, Silvano Desidera, Scott Gaudi, Raffaele Gratton, Michael Gillon, John Lee Grenfell, Olivier Guyon, Thomas Henning, Sasha Hinkley, Elsa Huby, Markus Janson, Christiane Helling, Kevin Heng, Markus Kasper, Christoph Keller, Matthew Kenworthy, Oliver Krause, Laura Kreidberg, Nikku Madhusudhan, Anne-Marie Lagrange, Ralf Launhardt, Tim Lenton, Manuel Lopez-Puertas, Anne-Lise Maire, Nathan Mayne, Victoria Meadows, Bertrand Mennesson, Giuseppina Micela, Yamila Miguel, Julien Milli, Michiel Min, Ernst de Mooij, David Mouillet, Mamadou N’Diaye, Valentina D’Orazi, Enric Palle, Isabella Pagano, Giampaolo Piotto, Didier Queloz, Heike Rauer, Ignasi Ribas, Garreth Ruane, Franck Selsis, Frans Snik, Alessandro Sozzetti, Daphne Stam, Christopher Stark, Arthur Vigan, Pieter de Visser

Detecting Earth-like Biosignatures on Rocky Exoplanets around Nearby Stars with Ground-based Extremely Large Telescopes

\baas 51 (2019) 3

Authors:

Mercedes Lopez-Morales, Thayne Currie, Johanna Teske, Eric Gaidos, Eliza Kempton, Jared Males, Nikole Lewis, Benjamin V Rackham, Sagi Ben-Ami, Jayne Birkby, David Charbonneau, Laird Close, Jeff Crane, Courtney Dressing, Cynthia Froning, Yasuhiro Hasegawa, Quinn Konopacky, Ravi K Kopparapu, Dimitri Mawet, Bertrand Mennesson, Ramses Ramirez, Deno Stelter, Andrew Szentgyorgyi, Ji Wang, Munazza Alam, Karen Collins, Andrea Dupree, Margarita Karovska, James Kirk, Amit Levi, Chima McGruder, Chris Packman, Sarah Rugheimer, Surangkhana Rukdee