Article
Astronomy & Astrophysics
Alyssa Rose Rhoden, Matthew E. Walker
Summary: Researchers study Mimas using Cassini measurements to determine the possible existence of an ocean and ice shell thickness, as well as discuss observational data to evaluate whether Mimas is a present-day ocean world.
Article
Astronomy & Astrophysics
Imre Kisvardai, Bernadett D. Pal, Akos Kereszturi
Summary: This article investigates the interior structure of Enceladus, an icy moon of Saturn, and reveals the presence of hydrothermal activity and tidal heating. Disagreements exist in the literature regarding the porosity calculation methods. The researchers use experimental equations, derived for Earth, to calculate the porosity of Enceladus, finding a minimum porosity of 5% and a total pore volume of 1.51 × 10(7) km(3). The comparison with Earth and Mars shows that Enceladus has a significantly larger pore surface area per unit area.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Mark Elowitz, Bhalamurugan Sivaraman, Amanda Hendrix, Jen-Iu Lo, Sheng-Lung Chou, Bing-Ming Cheng, B. N. Raja Sekhar, Nigel J. Mason
Summary: By analyzing far-ultraviolet reflectance spectra on the leading and trailing hemispheres of Rhea, a moon of Saturn, researchers found that hydrazine monohydrate and chlorine-containing molecules provide a good fit to the unidentified absorption feature near 184 nm. Considering the radiation-dominated chemistry on icy satellite surfaces, hydrazine monohydrate is proposed as the most plausible candidate for explaining the absorption feature. The presence of hydrazine on the surface is believed to not be from spacecraft fuel, as Cassini's thrusters were not used during flybys of icy satellites.
Article
Geochemistry & Geophysics
P. Driscoll, C. Davies
Summary: The persistence of the geomagnetic field conflicts with the highly thermally conductive core, making core convection and dynamo action difficult. Parameters such as mantle viscosity ratio, core thermal conductivity, and core radiogenic heat rate were explored to understand core evolution. Previous models failed to reproduce the present-day inner core size and dynamo, but a potentially new solution involving a hot initial core and lower melting temperature deserves further investigation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Astronomy & Astrophysics
D. A. Patthoff, R. T. Pappalardo, M. Golombek, H. Chilton, E. Crow-Willard, P. C. Thomas
Summary: Several large ridges on Saturn's icy moon Enceladus suggest that they may have been formed through processes similar to those on terrestrial planets. The ridges are possibly thrust blocks and show signs of recent high heat flow.
Article
Astronomy & Astrophysics
Menghao Fu, Hao Gu, Jun Cui, Zhiyong Xiao, Fei He, Yong Wei, Zhipeng Ren
Summary: This study focuses on modeling the water-rich plume erupting from 'tiger stripes' near Enceladus south polar region, using CO2 distribution extracted from Cassini measurements. The analysis reveals a complex spatio-temporal variability in plume structure, with varying source rate and Mach number among different sources and flybys. The identification of a correlation between Mach number and thermal brightness provides insights into the nature of geyser emission along the 'tiger stripes'.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
K. Dapre, J. C. E. Irving
Summary: This study investigates the effects of ice shell and ocean thickness, as well as core structure and composition, on the waveforms recorded by a single seismometer for three 1D models of Enceladus. The results suggest that core-transmitted and -reflected phases can be observed even at low epicentral distances, providing constraints on ocean depth and core structure.
Article
Astronomy & Astrophysics
Mathias Bostrom, Victoria Esteso, Johannes Fiedler, Iver Brevik, Stefan Yoshi Buhmann, Clas Persson, Sol Carretero-Palacios, Drew F. Parsons, Robert W. Corkery
Summary: Gas hydrates can be stabilized outside their thermodynamic stability window by forming ice layers, allowing CO2 clathrate particles to have positive buoyancy in ocean worlds. This self-preservation mechanism could prevent the sinking of gas hydrate particles and enhance the habitability of ocean worlds in our Solar System and beyond.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Alice A. Le Gall, Lea E. Bonnefoy, Robin Sultana, Cedric Leyrat, Michael. A. Janssen, Stephen Wall, Emmanuel Lellouch
Summary: Through the distant observations of the Cassini spacecraft's RADAR, the purity and maturity of Saturn's icy moons' regoliths were investigated. The study found that Enceladus has the cleanest regolith, while the regoliths of other moons become less pure as they move outward from Enceladus. The variations in microwave signatures are primarily attributed to the different levels of contamination in the regolith.
Article
Astronomy & Astrophysics
Wencheng D. Shao, Francis Nimmo
Summary: The heating effect of forced librations in Enceladus's ice shell is insufficient to match the inferred conductive heat loss, suggesting the presence of additional heating mechanisms. Enceladus may not be in a thermal steady state, but the strong dependence of conductive loss on shell thickness stabilizes its thermal state.
Article
Astronomy & Astrophysics
L. F. A. Teodoro, J. A. Kegerreis, P. R. Estrada, M. Cuk, V. R. Eke, J. N. Cuzzi, R. J. Massey, T. D. Sandnes
Summary: We simulate the collision of precursor icy moons to explain the origin of Saturn's young rings. This collision can produce a wide distribution of material and potentially form or rejuvenate rings. It can also disrupt and distribute debris for potential ring formation or the re-formation of moons.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Matija Cuk, Maryame El Moutamid
Summary: Saturn's system with moons and rings has been a subject of study regarding the age and dynamics. While young ages have been proposed for some of the moons, the recent discovery of fast orbital evolution suggests a frequency-dependent tidal response of Saturn. Resonance locking to inertial waves cannot explain the system's dynamics, but a high background tidal response coupled with discrete resonant modes seems to be a plausible explanation. Only Titan is in a long-term resonance lock with a tidal mode of Saturn, while Rhea is experiencing a transient period of fast tidal evolution. The present resonance of Enceladus with Dione can be reproduced if it went through a temporary period of fast tidal evolution.
PLANETARY SCIENCE JOURNAL
(2023)
Article
Environmental Sciences
Bruno Sigolo Coury, Erico Masiero, Eduardo Kruger
Summary: Urban heat island (UHI) studies have primarily focused on the temperature difference between urban and rural areas. However, the impact of choosing an appropriate rural reference location, considering the agricultural use of rural areas, has been understudied. This study investigates the interference of sugarcane harvesting periods on UHI magnitudes in Piracicaba, Brazil, emphasizing the importance of selecting a baseline rural station considering temporal variability.
Article
Chemistry, Physical
Siyu Jin, Weiguo Sun, Bole Chen, Xiaoyu Kuang, Haiyan Lu, Cheng Lu
Summary: This study conducted an extensive ground-state structure search for CeBn and CeBn- clusters, revealing that both neutral and anionic series possess half-sandwich geometry, with the neutral series showing a tendency to form borophene-like geometry and the anionic series containing more pentagonal and hexagonal holes.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Astronomy & Astrophysics
Shoucun Hu, Derek C. Richardson, Yun Zhang, Jianghui Ji
Summary: This study employs a soft-sphere discrete element method with cohesion to model the dynamical process of cohesive rubble piles under continuous spin-up. The simulations show that the interparticle cohesive force strengthens the bodies, especially for smaller ones, and is proportional to the best-fitting bulk cohesion. Furthermore, the relationship between T-c and material parameters reveals interesting trends related to density, friction angle, and size.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Geology
Katarzyna Misiura, Leszek Czechowski
GEOLOGICAL QUARTERLY
(2015)
Article
Geochemistry & Geophysics
Leszek Czechowski, Anna Losiak
Article
Geology
Piotr Witek, Leszek Czechowski, Katarzyna Misiura
GEOLOGICAL QUARTERLY
(2016)
Article
Geology
Katarzyna Misiura, Leszek Czechowski, Piotr Witek, Anastasiia Bendiukova
GEOLOGICAL QUARTERLY
(2016)
Article
Geochemistry & Geophysics
Leszek Czechowski, Anna Losiak
Article
Astronomy & Astrophysics
Konrad J. Kossacki, Jacek Leliwa-Kopystynski, Piotr Witek, Aleksander Jasiak, Adrian Dubiel
Article
Geology
Leszek Czechowski
GEOLOGICAL QUARTERLY
(2018)
Article
Astronomy & Astrophysics
Konrad J. Kossacki, Leszek Czechowski
Article
Astronomy & Astrophysics
Leszek Czechowski
PLANETARY AND SPACE SCIENCE
(2018)
Article
Geosciences, Multidisciplinary
Jacek Puziewicz, Leszek Czechowski, Marek Grad, Jacek Majorowicz, Anna Pietranik, Jan Safanda
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2019)
Article
Astronomy & Astrophysics
Konrad J. Kossacki, Katarzyna Misiura, Leszek Czechowski
Article
Astronomy & Astrophysics
Konrad J. Kossacki, Leszek Czechowski, Grzegorz Skora
Article
Astronomy & Astrophysics
Konrad J. Kossacki, L. Czechowski
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Konrad J. Kossacki, Grzegorz Skora, Leszek Czechowski
Article
Geochemistry & Geophysics
Leszek Czechowski
PURE AND APPLIED GEOPHYSICS
(2019)
