Article
Astronomy & Astrophysics
Yeva Gevorgyan
Summary: This study investigates whether a multilayered planet can be approximated as a homogeneous planet and how well the dissipation rate of a multilayered planet can be reproduced with a homogeneous rheology. The results show that it is possible to approximate the behavior of a multilayer icy planet with a homogeneous planet using the Sundberg-Cooper rheology, highlighting the fact that the complexity of a multilayer planet model is not necessary to estimate the tidal dissipation of an icy planet.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
B. Charnay, G. Tobie, S. Lebonnois, R. D. Lorenz
Summary: By studying Titan's atmosphere, the Dragonfly mission can provide valuable constraints on the interior of Titan.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
X. J. Xi, A. Vienne
Summary: This study aims to construct new synthetic representations of the JPL Titan ephemeris in order to obtain the complete combinations of the osculating elements. By using an analytical representation method, the advantages of both the TASS system and the high precision of JPL can be achieved.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. R. Gomes-Junior, T. Santana, O. C. Winter, R. Sfair
Summary: The dynamical evolution of the Prometheus and Pandora pair of satellites is chaotic, and the orbits of Prometheus and Pandora are influenced significantly by other major satellites in the Saturn system.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ye Yuan, Fan Li, Yanning Fu, Jian Chen
Summary: Through new observations and ephemerides, a dynamic model update has effectively improved the ephemerides for Triton and Nereid. The model fitting process led to the determination of Neptune's pole orientation, providing refined geometric descriptions.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Benno A. Neuenschwander, Ravit Helled
Summary: This paper presents empirical structure models of Uranus and Neptune and predicts their rotation periods and wind depths by using higher order gravitational coefficients. The study finds that faster rotation and deep winds favor centrally concentrated density distributions. Accurate measurements of the gravity field and moment of inertia can constrain their internal structures and wind depths.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Sergio R. A. Gomes, Alexandre C. M. Correia
Summary: The orbits of Uranus' main satellites are expected to drift away gradually due to tides raised in the planet. The 5/3 mean motion resonance between Ariel and Umbriel was likely encountered in the past, and it has been challenging to explain why the eccentricities of the satellites must be larger than 0.01 to prevent entrapment in this resonance. Additionally, if the satellites experience temporary capture and escape, their inclinations rise to high values that are not observed today. Revisiting this problem, a study using a circular two-satellite model focused on inclination, showing that with an inclination of around 0.15 degrees at the time of the 5/3 resonance encounter, capture can be avoided in about 60% of cases.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
D. Souami, S. Renner, B. Sicardy, M. Langlois, B. Carry, P. Delorme, P. Golaszewska
Summary: Neptune's incomplete ring arcs have remained stable since their discovery in 1984, despite theoretical predictions of destruction through Keplerian motion. Analysis of high-resolution near-infrared images from 2016 confirms the stability of trailing arcs Fraternite and egalite since 2007, while leading arcs Courage and Liberte are fading away. The mismatch between the arcs' position and resonances with satellite Galatea demonstrates that existing corotation models do not fully explain the confinement of the arcs' material.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Bo Wang, Jianguo Yan, Wutong Gao, Ye Yuan, Shangbiao Sun, Mao Ye, Jean-Pierre Barriot
Summary: This study updates the orbital and dynamical model of Triton using astrometric data from 1847 to 2020, and estimates the gravity parameters of Neptune. The new model fits well with the observations and has implications for future deep space exploration missions and solar system dynamics studies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
N. Emelyanov, M. Varfolomeev, V Lainey
Summary: This article presents updated versions of the ephemerides of outer planetary satellites, discusses the problem and methodology for estimating ephemeris accuracy, and emphasizes the need for new observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
C. de la Fuente Marcos, R. de la Fuente Marcos
Summary: The study identified three new Mars Trojans and proposed a mechanism possibly related to the formation of co-orbital minor bodies. Clustering phenomena were also observed in Earth co-orbital candidates, potentially linked to disruption events.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Timothee Vaillant, Alexandre C. M. Correia
Summary: In this paper, we study the effects of secular resonances on the orbit of a satellite, particularly eviction resonances, which can significantly modify the eccentricity and inclination of the satellite. We estimate the impact of resonance crossing on the satellite's orbit, including capture probabilities, based on several parameters. Additionally, we use frequency map analysis to study resonant dynamics and find that some secular resonances may overlap, leading to chaotic motion for the satellite's inclination.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Giorgi Kokaia, Melvyn B. Davies, Alexander J. Mustill
Summary: The article discusses the formation of stars in dense clusters and the transfer of planets between stars during close encounters. It examines how these captured planets affect Kuiper belt-like planetesimal belts in their new systems, showing that they can destabilize the belt and impact habitable planets. The study finds that when a Jupiter-mass planet is captured, it can destabilize giant planets in the system, deplete the belt, or create a flux of impactors detrimental to the development of life.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ludwig Scheibe, Nadine Nettelmann, Ronald Redmer
Summary: Thermal evolution models of Uranus and Neptune suggest that their luminosities are inconsistent with the classical assumption of an adiabatic interior, with the influence of a thermally conductive boundary layer being a significant factor. Even a thin conductive layer of a few kilometers can greatly affect planetary cooling, resulting in either brighter or fainter appearances compared to the adiabatic case. The models also indicate that Uranus may have been in equilibrium with solar flux for a longer period of time.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Petr Fatka, Nicholas A. Moskovitz, Petr Pravec, Marco Micheli, Maxime Devogele, Annika Gustafsson, Jay Kueny, Brian Skiff, Peter Kusnirak, Eric Christensen, Judit Ries, Melissa Brucker, Robert McMillan, Jeffrey Larsen, Ron Mastaler, Terry Bressi
Summary: A newly discovered pair of near-Earth objects (NEOs) were found to be genetically related asteroids that recently separated but still reside on similar orbits. Spectral analysis and orbit calculations suggested a common origin and a young age for this asteroid pair.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Geochemistry & Geophysics
J. S. Knibbe, A. Rivoldini, S. M. Luginbuhl, O. Namur, B. Charlier, M. Mezouar, D. Sifre, J. Berndt, Y. Kono, D. R. Neuville, W. van Westrenen, T. Van Hoolst
Summary: Experimental measurements of density and P-wave velocity of liquid Fe-Si-C alloys at pressures up to 5.8 GPa are used to construct an interior structure model for Mercury, suggesting the presence of S and/or C in the core.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Meteorology & Atmospheric Sciences
Orkun Temel, Cem Berk Senel, Sara Porchetta, Domingo Munoz-Esparza, Michael A. Mischna, Tim Van Hoolst, Jeroen van Beeck, Ozgur Karatekin
Summary: This study focuses on investigating turbulence statistics and turbulent spectrum in the Martian planetary boundary layer using Large-Eddy Simulation (LES) computations. It proposes a generic formulation for mixing length scale variation in the Martian convective boundary layer based on computed turbulence kinetic energy and its dissipation rate. The proposed scheme improves the prediction of convective boundary layer height and near surface meteorology conditions at the InSight landing site compared to the currently used scheme in the MarsWRF model.
ATMOSPHERIC RESEARCH
(2021)
Article
Astronomy & Astrophysics
Daniel S. Kahan, William M. Folkner, Dustin R. Buccino, Veronique Dehant, Sebastien Le Maistre, Attilio Rivoldini, Tim Van Hoolst, Marie Yseboodt, J. C. Marty
Summary: The InSight mission has improved understanding of Mars' interior through the RISE experiment, which measures the Doppler shift of radio transmissions to determine Mars' rotation. By analyzing data from multiple missions spanning 43 years, an estimate of Mars precession rate was obtained, consistent with previous estimates.
PLANETARY AND SPACE SCIENCE
(2021)
Review
Astronomy & Astrophysics
Antonio Genova, Hauke Hussmann, Tim Van Hoolst, Daniel Heyner, Luciano Iess, Francesco Santoli, Nicolas Thomas, Paolo Cappuccio, Ivan di Stefano, Patrick Kolhey, Benoit Langlais, Johannes Z. D. Mieth, Joana S. Oliveira, Alexander Stark, Gregor Steinbrugge, Nicola Tosi, Johannes Wicht, Johannes Benkhoff
Summary: The BepiColombo mission aims to study Mercury's internal structure and evolution using instruments such as BELA, MORE, and MPO-MAG. The MPO spacecraft will provide precise measurements of Mercury's topography, gravity, and magnetic field, improving our understanding of the planet. Additionally, the dual-spacecraft configuration of the mission will help separate the internal and external contributions to Mercury's magnetic field.
SPACE SCIENCE REVIEWS
(2021)
Review
Astronomy & Astrophysics
L. Iess, S. W. Asmar, P. Cappuccio, G. Cascioli, F. De Marchi, I di Stefano, A. Genova, N. Ashby, J. P. Barriot, P. Bender, C. Benedetto, J. S. Border, F. Budnik, S. Ciarcia, T. Damour, V Dehant, G. Di Achille, A. Di Ruscio, A. Fienga, R. Formaro, S. Klioner, A. Konopliv, A. Lemaitre, F. Longo, M. Mercolino, G. Mitri, V Notaro, A. Olivieri, M. Paik, A. Palli, G. Schettino, D. Serra, L. Simone, G. Tommei, P. Tortora, T. Van Hoolst, D. Vokrouhlicky, M. Watkins, X. Wu, M. Zannoni
Summary: The MORE experiment will provide accurate estimation of Mercury's gravity field and rotational state, improved tests of general relativity, and use of stable multi-frequency radio link for measurements. Additionally, the experiment includes testing of pseudo-noise ranging system for more precise measurements.
SPACE SCIENCE REVIEWS
(2021)
Article
Astronomy & Astrophysics
Luis Gomez Casajus, Marco Zannoni, Dario Modenini, Paolo Tortora, Francis Nimmo, Tim Van Hoolst, Dustin Buccino, Kamal Oudrhiri
Summary: The Galileo radio tracking data was reanalyzed using new knowledge of Jupiter from the Juno mission and modern orbit determination techniques from the Cassini data analysis. Doppler data from six Europa encounters provided an updated gravity field of the moon, resulting in a statistically different value of C-22. The new value suggests a thinner ice-water shell and less dense interior for Europa.
Article
Astronomy & Astrophysics
J. Van Beeck, D. M. Bowman, M. G. Pedersen, T. Van Reeth, T. Van Hoolst, C. Aerts
Summary: We re-analyzed the light curves of 38 known Kepler SPB stars to detect direct non-linear resonant mode coupling among the largest-amplitude gravity modes. Results show that the majority of these stars reveal direct non-linear resonances based on the largest-amplitude modes, making them prime targets for non-linear asteroseismic modeling.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Gael Choblet, Gabriel Tobie, Arnaud Buch, Ondrej Cadek, Laura M. Barge, Marie Behounkova, Eloi Camprubi, Caroline Freissinet, Matt Hedman, Geraint Jones, Valery Lainey, Alice Le Gall, Alice Lucchetti, Shannon MacKenzie, Giuseppe Mitri, Marc Neveu, Francis Nimmo, Karen Olsson-Francis, Mark Panning, Frank Postberg, Joachim Saur, Juergen Schmidt, Yasuhito Sekine, Takazo Shibuya, Christophe Sotin, Ondrej Soucek, Cyril Szopa, Tomohiro Usui, Steven Vance, Tim Van Hoolst
Summary: Enceladus has the potential to support life, with direct sampling revealing the possibility of habitability. Future missions involving advanced instruments and sample return are needed to further investigate the potential emergence of life on this intriguing moon.
EXPERIMENTAL ASTRONOMY
(2022)
Correction
Geochemistry & Geophysics
Doris Breuer, Tilman Spohn, Tim Van Hoolst, Wim van Westrenen, Sabine Stanley, Nicolas Rambaux
SURVEYS IN GEOPHYSICS
(2022)
Article
Geochemistry & Geophysics
Doris Breuer, Tilman Spohn, Tim Van Hoolst, Wim van Westrenen, Sabine Stanley, Nicolas Rambaux
Summary: The Earth-like planets and moons in our solar system have diverse internal compositions, with iron-rich cores and silicate mantles. The heat mechanisms and geological evolution of these planets and moons differ significantly, such as the present-day magnetic fields on Mercury and Ganymede, compared to the ceased core dynamos on the Moon and Mars.
SURVEYS IN GEOPHYSICS
(2022)
Article
Astronomy & Astrophysics
R. -M. Baland, A. Hees, M. Yseboodt, A. Bourgoin, S. Le Maistre
Summary: Researchers provide new and more accurate estimations of relativistic corrections for the orientation and rotation of Mars, which are crucial for inferring the planet's internal properties.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Geochemistry & Geophysics
M. Puica, V Dehant, M. Folgueira, T. Van Hoolst, J. Rekier
Summary: The Earth's rotation is affected by gravitational torques from the Sun and the Moon, as well as angular momentum exchange with the atmosphere and hydrosphere. This study focuses on the influence of topography at the core-mantle boundary on variations in the length-of-day (LOD). Using an analytical approach, the researchers identify resonance frequencies and degrees of topographic coefficients that amplify tidal effects on LOD variations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Sebastien Le Maistre, Attilio Rivoldini, Alfonso Caldiero, Marie Yseboodt, Rose-Marie Baland, Mikael Beuthe, Tim Van Hoolst, Veronique Dehant, William M. Folkner, Dustin Buccino, Daniel Kahan, Jean-Charles Marty, Daniele Antonangeli, James Badro, Melanie Drilleau, Alex Konopliv, Marie-Julie Peters, Ana-Catalina Plesa, Henri Samuel, Nicola Tosi, Mark Wieczorek, Philippe Lognonne, Mark Panning, Suzanne Smrekar, W. Bruce Banerdt
Summary: Knowledge of the interior structure and atmosphere of Mars is essential for understanding the planet's formation and evolution. The NASA InSight mission provided seismic and lander radio science data, which allowed us to determine the core, mantle, and atmosphere properties of Mars. Our analysis found a liquid core with specific dimensions and density, and no evidence of a solid inner core. We also discovered internal mass anomalies within the mantle and observed a slow acceleration in the Martian rotation rate.
Article
Astronomy & Astrophysics
O. Mousis, A. Bouquet, Y. Langevin, N. Andre, H. Boithias, G. Durry, F. Faye, P. Hartogh, J. Helbert, L. Iess, S. Kempf, A. Masters, F. Postberg, J. -B. Renard, P. Vernazza, A. Vorburger, P. Wurz, D. H. Atkinson, S. Barabash, M. Berthomier, J. Brucato, M. Cable, J. Carter, S. Cazaux, A. Coustenis, G. Danger, V. Dehant, T. Fornaro, P. Garnier, T. Gautier, O. Groussin, L. Z. Hadid, J. -C. Ize, I. Kolmasova, J. -P. Lebreton, S. Le Maistre, E. Lellouch, J. I. Lunine, K. E. Mandt, Z. Martins, D. Mimoun, Q. Nenon, G. M. Munoz Caro, P. Rannou, H. Rauer, P. Schmitt-Kopplin, A. Schneeberger, M. Simons, K. Stephan, T. Van Hoolst, J. Vaverka, M. Wieser, L. Woerner
Summary: Enceladus, a moon of Saturn, has an internal water ocean and expels ocean material into space. The Moonraker mission aims to investigate the composition of the plume formed by the ocean jets to understand the moon's habitability and origin. This proposed mission will use advanced instruments to pave the way for future landed missions.
PLANETARY SCIENCE JOURNAL
(2022)