Article
Multidisciplinary Sciences
Sergey Ershkov, Dmytro Leshchenko
Summary: This paper applies recent ansatz to estimate the stability of Laplace resonance among Galilean moons, finding that the resonance should be valid and stable in the future, with possible chaotic perturbations of less than 0.1%. Furthermore, it is discovered that there is a net transfer of angular momentum between Io and Europa, resulting in tidal heating.
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
(2021)
Article
Astronomy & Astrophysics
William A. Hoey, Laurence M. Trafton, Peter C. Ackley, David B. Goldstein, Philip L. Varghese
Summary: The New Horizons flyby captured images of the erupting Pele-class volcanic plume, Tvashtar, showing short-term dynamical activity. Through high-resolution images and 3-D simulations, virtual vent conditions for Tvashtar were determined, including aspect ratio, stagnation temperature, area, and mass flow rate. Various canopy shock and depositional ring configurations were evaluated, with the hypothesis that transient perturbations in the gas canopy shock itself may induce temporary canopy collapse.
Article
Geosciences, Multidisciplinary
F. Zambon, A. Mura, R. M. C. Lopes, J. Rathbun, F. Tosi, R. Sordini, R. Noschese, M. Ciarniello, A. Cicchetti, A. Adriani, L. Agostini, G. Filacchione, D. Grassi, G. Piccioni, C. Plainaki, G. Sindoni, D. Turrini, S. Brooks, C. Hansen-Koharcheck, S. Bolton
Summary: In this study, the most updated catalog of Io hot spots based on Juno/JIRAM data is presented. A total of 242 hot spots were found, including 23 previously undetected ones. Most of the new hot spots were located at high latitudes (>70 degrees). There was a latitudinal variability and a higher concentration of hot spots in the polar regions, especially in the North. The comparison with previous hot spot catalogs showed that JIRAM detected a high percentage of the total number of hot spots and confirmed the activity of some faint hot spots.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Aerospace
Nimmi Narayanan, Shivashankar S. Menon, N. V. Sujatha
Summary: In this article, we present an empirical model of airglow emission derived from deep GALEX observations, which correlates with solar activity and solar angle. Using machine learning models, we find that the total airglow consists of a baseline part and a variable part, which are determined by solar angle, solar flux, and observation time.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Geochemistry & Geophysics
Shannon Brown, Zhimeng Zhang, Scott Bolton, Lea E. Bonnefoy, Anton Ermakov, Jianqing Feng, Paul Hartogh, Steven Levin, Sidharth Misra, Matthew Siegler, David Stevenson
Summary: On June 7, 2021, Juno spacecraft flew close to Ganymede, mapping its ice shell at different frequencies and observing the brightness temperature and reflectivity of different terrains. The microwave observations revealed that brighter regions have lower brightness temperatures, possibly due to multiple reflections of the colder sky background at sub-surface interfaces, while dark regions show microwave reflectivity that can be explained by the presence of a thin silicate or salt contaminant surface layer. The observations also suggest an upper bound on the depth of the ice shell conducting layer.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Astronomy & Astrophysics
Gustavo Madeira, Andre Izidoro, Silvia M. Giuliatti Winter
Summary: The origins of the Galilean satellites, namely Io, Europa, Ganymede, and Callisto, are not fully understood yet. N-body numerical simulations were used to study the formation of these satellites in a gaseous circumplanetary disc around Jupiter, showing that integrated pebble flux plays a significant role in their formation and mass distribution. The Galilean satellites system is proposed to be a primordial resonant chain similar to exoplanet systems, with Callisto possibly being in resonance with Ganymede in the past.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Geochemistry & Geophysics
Ashley Gerard Davies, Audrey Helena Vorburger
Summary: Io's extreme volcanism, driven by tidal heating, has created a young surface with no impact craters dominated by hundreds of active volcanic centers. The eruptions produce voluminous, low-viscosity, high-temperature silicate lavas, and the venting gas contributes to Io's thin atmosphere.
Article
Astronomy & Astrophysics
Ilaria Ermolli, Fabrizio Giorgi, Mariarita Murabito, Marco Stangalini, Vincenzo Guido, Marco Molinaro, Paolo Romano, Salvatore L. Guglielmino, Giorgio Viavattene, Gianna Cauzzi, Serena Criscuoli, Kevin P. Reardon, Alexandra Tritschler
Summary: IBIS-A is a resource for storing data acquired with IBIS. The archive currently contains observations from 2003 to 2019, which can be used to study plasma processes in the solar atmosphere and the solar origin of space weather events.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Giacomo Lari, Melaine Saillenfest, Clara Grassi
Summary: The dynamics of the Galilean satellites are determined by Laplace resonance and strong tidal dissipation, causing variations of their semimajor axes. The compatibility of Callisto's fast migration with the current orbital configuration is investigated. Simulations show that Callisto can cross the 2:1 resonance with Ganymede without being captured, but is mostly captured despite its divergent migration. Eventually, Callisto can escape by crossing a high-order resonance with Ganymede and the system can relax to its current configuration.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Meteorology & Atmospheric Sciences
Gregory R. Carmichael, Oksana Tarasova, Oystein Hov, Leonard Barrie, James H. Butler
Summary: Further investments are needed globally to support high-quality, research-driven observations of atmospheric composition in order to address urgent societal needs related to weather, climate, air quality, and the environment. Challenges include maintaining current observing systems with limited budgets and filling geographical gaps for key constituents. Strengthening the observing systems can be achieved through science-for-services applications, interoperable systems, standardized metadata, and ensuring data accessibility and reuse. It is crucial to transition from one-component observations to multifunctional infrastructure coupled with Earth system models to serve operational and research purposes, leading to faster exploration and application of atmospheric composition information.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Rowan Dayton-Oxland, Hans L. F. Huybrighs, Thomas O. Winterhalder, Arnaud Mahieux, David Goldstein
Summary: Europa's subsurface ocean is a potential habitat for life. New models incorporating collisions between plume particles have shown the development of shocks, limiting the altitude and extent of the plumes. The ability of the JUICE spacecraft to detect plume H2O molecules is reduced with the collisional model compared to the collisionless model. Flybys passing near the shock can provide valuable data on the structure and physics of Europa's plumes.
Article
Geochemistry & Geophysics
Anne Pommier, Alfred McEwen
Summary: Jupiter's moon Io is the most volcanically active world in our Solar System, sustained by tidal heating caused by gravitational interactions with Jupiter and other moons. The volcanic activity and high heat flow on Io provide valuable insights into the processes that shaped terrestrial bodies. Future exploration of Io could lead to key discoveries about the evolution of terrestrial planets and moons within and beyond our Solar System.
Article
Astronomy & Astrophysics
Madison E. Borrelli, Geoffrey C. Collins
Summary: Through studying and comparing the topographic moats at the edges of Charon's Vulcan Planitia in the Oz Terra region, it was found that plate bending models provided the best fits for the topography, with lava flow models also showing good matches in some profiles. The results suggest an elastic thickness of around 1 km for a continuous plate or around 3 km for a broken plate, as well as a Bingham yield strength of around 10 kPa, consistent with previous findings on cryovolcanic material.
Article
Geosciences, Multidisciplinary
Patricia A. Cleary, Gijs de Boer, Joseph P. Hupy, Steven Borenstein, Jonathan Hamilton, Ben Kies, Dale Lawrence, R. Bradley Pierce, Joe Tirado, Aidan Voon, Timothy Wagner
Summary: The mesoscale meteorology of lake breezes along Lake Michigan affects the local observations of high-ozone events. In this study, two UAS platforms were used to capture lake breezes during forecasted high-ozone events. The campaign was conducted in conjunction with the Enhanced Ozone Monitoring plan from the Wisconsin DNR, which included Doppler lidar wind profiler observations at the site.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Astronomy & Astrophysics
Cynthia S. K. Ho, Vincent Van Eylen
Summary: The lack of planets between 1.5 and 2 Earth radii at periods shorter than about 100 days, known as the radius valley, sheds light on the formation and evolution of close-in planets. By reanalyzing the transits of 431 planets using Kepler's 1-min short cadence observations, we reveal a deeper radius valley than previously observed, indicating a more homogeneous core composition during formation. Our findings suggest that the location of the radius valley strongly depends on orbital period and stellar mass, with a weak dependence on stellar age. This study emphasizes the importance of precise transit observations with a short photometric cadence in determining planet radii, and provides an updated list of accurately determined parameters for the studied planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Katherine de Kleer, Imke de Pater, Mate Adamkovics
Article
Astronomy & Astrophysics
Edward Molter, Imke de Pater, Statia Luszcz-Cook, Ricardo Hueso, Joshua Tollefson, Carlos Alvarez, Agustin Sanchez-Lavega, Michael H. Wong, Andrew Hsu, Lawrence A. Sromovsky, Patrick M. Fry, Marc Delcroix, Randy Campbell, Katherine de Kleer, Elinor Gates, Paul David Lynam, S. Mark Ammons, Brandon Park Coy, Gaspard Duchene, Erica J. Gonzales, Lea Hirsch, Eugene A. Magnier, Sam Ragland, R. Michael Rich, Feige Wang
Article
Geosciences, Multidisciplinary
Katherine de Kleer, Francis Nimmo, Edwin Kite
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geochemistry & Geophysics
Saverio Cambioni, Katherine de Kleer, Michael Shepard
Summary: Researchers analyzed data from the Atacama Large Millimeter Array (ALMA) and found that the asteroid Psyche has a heterogeneous surface in terms of dielectric constant and thermal inertia. Interestingly, there is no direct correlation between these two properties on the surface. The heterogeneity in dielectric constant is explained by variations in the relative abundance of metal and silicates. Additionally, the lowlands of a large depression on Psyche have lower thermal inertia compared to the surrounding highlands, potentially due to a thin mantle of fine regolith, fractured bedrock, and/or implanted silicate-rich materials.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Astronomy & Astrophysics
Katherine de Kleer, Zachariah Milby, Carl Schmidt, Maria Camarca, Michael E. Brown
Summary: The tenuous atmospheres of the Galilean satellites are studied through their auroral emissions, with most focus on UV wavelengths. This study presents the first detections of optical aurorae on Ganymede and Callisto, as well as new optical auroral lines on Europa. Measurements of various emission lines provide robust constraints on atmospheric composition. The study finds predominantly O-2 atmospheres on Europa and Ganymede, with weak evidence of H2O on Europa and only an upper limit for H2O on Ganymede. The electron properties at Callisto's orbit are poorly constrained. Overall, a score of 9 is given.
PLANETARY SCIENCE JOURNAL
(2023)
Article
Astronomy & Astrophysics
Carl Schmidt, Mikhail Sharov, Katherine de Kleer, Nick Schneider, Imke de Pater, Phillip H. Phipps, Albert Conrad, Luke Moore, Paul Withers, John Spencer, Jeff Morgenthaler, Ilya Ilyin, Klaus Strassmeier, Christian Veillet, John Hill, Mike Brown
Summary: The response of oxygen and sodium during Io's eclipse phase is explored, revealing that oxygen is unaffected by changing illumination, while sodium rapidly disappears. Ion chemistry can account for this discrepancy, with the molecular ionosphere of oxygen being weaker at egress, whereas the behavior of sodium can be explained by a NaCl+ photochemical pathway.
PLANETARY SCIENCE JOURNAL
(2023)
Article
Multidisciplinary Sciences
Samantha K. K. Trumbo, Michael E. E. Brown, Dominique Bockelee-Morvan, Imke de Pater, Thierry Fouchet, Michael H. H. Wong, Stephanie Cazaux, Leigh N. Fletcher, Katherine de Kleer, Emmanuel Lellouch, Alessandro Mura, Olivier Poch, Eric Quirico, Pablo Rodriguez-Ovalle, Mark R. R. Showalter, Matthew S. S. Tiscareno, Federico Tosi
Summary: Ganymede, the only satellite with an intrinsic magnetic field, experiences interactions with the Jovian magnetosphere, resulting in the accumulation of charged particles in its polar regions. Observations with JWST have revealed the presence of hydrogen peroxide, a product of radiolysis, at high latitudes, indicating the modification of polar caps by precipitation of Jovian charged particles along partially open field lines within Ganymede's magnetosphere. This discovery, along with the contrasting distribution of hydrogen peroxide on Europa, has important implications for understanding water-ice radiolysis in the solar system.
Article
Astronomy & Astrophysics
Erin Redwing, Imke de Pater, Statia Luszcz-Cook, Katherine de Kleer, Arielle Moullet, Patricio M. Rojo
Summary: We conducted the first comprehensive study on NaCl and KCl gases in Io's atmosphere, investigating their characteristics and inferring properties of Io's volcanoes and subsurface magma chambers. The spatial distribution and high temperatures suggest a volcanic origin, with a higher preference for outgassing KCl over NaCl.
PLANETARY SCIENCE JOURNAL
(2022)
Article
Astronomy & Astrophysics
Katherine de Kleer, Michael Skrutskie, Jarron Leisenring, Ashley G. Davies, Al Conrad, Imke de Pater, Aaron Resnick, Vanessa P. Bailey, Denis Defrere, Phil Hinz, Andrew Skemer, Eckhart Spalding, Amali Vaz, Christian Veillet, Charles E. Woodward
Summary: Observations with high spatial resolution at various active volcanic sites on Io have provided insights into lava flow coverage and distinct emitting regions within volcanic centers. The emission from two volcanoes with previous eruptions was resolved into multiple distinct regions, shedding light on the temporal evolution of these eruptions from other observations.
PLANETARY SCIENCE JOURNAL
(2021)
Article
Astronomy & Astrophysics
Michael K. Shepard, Katherine de Kleer, Saverio Cambioni, Patrick A. Taylor, Anne K. Virkki, Edgard G. Rivera-Valentin, Carolina Rodriguez Sanchez-Vahamonde, Luisa Fernanda Zambrano-Marin, Christopher Magri, David Dunham, John Moore, Maria Camarca
Summary: A shape model of asteroid 16 Psyche was developed using observations from various wavelengths. The model provides dimensions, spin axis, and surface composition information suggesting Psyche may be a differentiated world with metal-rich regions. These findings support a possible ferrovolcanism formation mechanism for localized regions.
PLANETARY SCIENCE JOURNAL
(2021)
Article
Astronomy & Astrophysics
Katherine de Kleer, Saverio Cambioni, Michael Shepard
Summary: Asteroid (16) Psyche, known as the largest M-type asteroid, has been theorized to be the core of disrupted planetesimals and parent bodies of iron meteorites. Recent observations suggest that its composition may not be pure metal, but still exhibit anomalous spectral and radar properties. The thermal emission observations indicate a possible surface composition of porous mixture of silicates and metals, with a metal content of at least 20%, and suggest a highly scattering surface due to the absence of polarized emission.
PLANETARY SCIENCE JOURNAL
(2021)
Article
Astronomy & Astrophysics
Imke de Pater, Statia Luszcz-Cook, Patricio Rojo, Erin Redwing, Katherine de Kleer, Arielle Moullet
PLANETARY SCIENCE JOURNAL
(2020)
Article
Astronomy & Astrophysics
Katherine de Kleer, Imke de Pater, Edward M. Molter, Elizabeth Banks, Ashley Gerard Davies, Carlos Alvarez, Randy Campbell, Joel Aycock, John Pelletier, Terry Stickel, Glenn G. Kacprzak, Nikole M. Nielsen, Daniel Stern, Joshua Tollefson
ASTRONOMICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Katherine de Kleer, Michael E. Brown
ASTRONOMICAL JOURNAL
(2018)