Article
Astronomy & Astrophysics
Nicholas Z. Rui, Jim Fuller
Summary: Strong magnetic fields in stellar cores can suppress dipole modes observed in red giants. The interaction between g-mode spectrum and Alfven waves produces discontinuous features in fluid displacements. Magnetogravity modes become evanescent in regions with strong magnetic fields, while ingoing gravity waves are refracted into outgoing slow magnetic waves. These findings suggest the possible escape of a small fraction of wave power as pure Alfven waves or magnetogravity waves confined to a narrow equatorial band.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
S. K. Lander, P. Haensel, B. Haskell, J. L. Zdunik, M. Fortin
Summary: The study explores the thermal and magnetic field structure of a late-stage proto-neutron star, establishing a simplified equation of state for hot neutron stars and solving the stellar equilibrium equations numerically. The ellipticity increases with temperature for a fixed magnetic field strength, and the Keplerian velocity is considerably lower for hotter stars. Magnetic fields stronger than around 10^14 G have qualitatively similar equilibrium states in both hot and cold neutron stars, with the poloidal field component dominating over the toroidal one.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Vishnu Varma, Bernhard Mueller
Summary: In the first 3D MHD simulation of convective oxygen and neon shell burning in a non-rotating star, magnetic fields in supernova progenitors were studied. The magnetic field approaches saturation levels in the oxygen shell, but does not reach kinetic equipartition.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Shyeh Tjing Loi
Summary: The complex interplay of rotation and magnetism in evolved stars requires proper modeling of both factors to draw robust conclusions about the existence of a core magnetic field in any given object.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Clara Dehman, Daniele Vigano, Stefano Ascenzi, Jose A. Pons, Nanda Rea
Summary: We perform 3D fully coupled magneto-thermal simulations of neutron stars with complex initial magnetic field topology. The surface dipolar component does not increase over time, contradicting the observed properties of young pulsars and magnetars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yu-Qing Lou, Jing-Ze Ma
Summary: Gravitational dynamic collapses of supermassive stars can result in the formation of black holes in various mass ranges. The presence of magnetic fields affects the stability of these collapses, with higher magnetic energy increasing the upper mass limit for instability. Magnetized stars also show a shifted evolutionary track and the potential for powerful electromagnetic wave bursts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Vasundhara Shaw, Arjen van Vliet, Andrew M. Taylor
Summary: By analyzing polarized synchrotron emission maps and comparing them with observational data, researchers have constrained the parameters of the Galactic halo bubble magnetic field model. It is found that the magnetic field in the Galactic halo bubble region can significantly impact the deflection of UHECRs propagating from potential local source locations to Earth.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Review
Chemistry, Multidisciplinary
Songzhu Luo, Kamal Elouarzaki, Zhichuan J. Xu
Summary: Developing new strategies in magnetoelectrochemistry is crucial to control and understand electrochemical reactions. It combines concepts from multiple disciplines and explores the effects of magnetic fields on fundamental electrochemical principles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Astronomy & Astrophysics
Deniz Soyuer, Ravit Helled
Summary: The low luminosity of Uranus remains a puzzling phenomenon, with implications for its thermal and compositional gradients. Recent studies have shown that planetary volatiles become ionically conducting under specific conditions, leading to rapidly growing electrical conductivity that couples zonal flows to the background magnetic field. These perturbations are expected to diffuse and produce poloidal fields, providing insights into Uranus' interior structure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
James H. Roberts, Angela M. Stickle
Summary: The origin of the unique south polar terrain on Enceladus is not well understood. While gravity measurements suggest the ice shell is thinner at the south pole, tides alone are insufficient to explain the observed thermal anomaly, indicating the need for a non-tidal physical mechanism.
Article
Astronomy & Astrophysics
Samantha A. Moruzzi, Walter S. Kiefer, Jeffrey C. Andrews-Hanna
Summary: Radar images from the Magellan mission reveal compressional ridge belts on Venus, including Vedma Dorsa, formed by blind thrust faulting and shallow folding. Our models suggest fault parameters of D-1-2 km, z-10-25 km, and 0-25-30 degrees. The depth of the upper fault tip and the change in dip at depth indicate an intermediate structure between lobate scraps and fold and thrust belts. The estimated heat flux during the formation of Vedma Dorsa is 16-39 mW/m2.
Review
Physics, Multidisciplinary
Tanmay Vachaspati
Summary: Magnetic fields play a significant role in the evolution and formation of the universe, potentially generated with significant energy density in the early universe. The generation of magnetic helicity is related to the breaking of symmetry in fundamental particle interactions and requires new CP violating interactions for production.
REPORTS ON PROGRESS IN PHYSICS
(2021)
Article
Astronomy & Astrophysics
Marshall J. Styczinski, Steven D. Vance, Erika M. Harnett, Corey J. Cochrane
Summary: Magnetic investigations of icy moons have provided evidence for subsurface liquid water oceans, with tidal deformation causing changes in induced dipole moments. Applying this to models of Europa, Miranda, Callisto, and Triton revealed significant differences in induced magnetic fields under asymmetric conditions.
Article
Astronomy & Astrophysics
Robert Grimm, Julie Castillo-Rogez, Carol Raymond, Andrew R. Poppe
Summary: Using solar wind as a source, electromagnetic sounding can assess the depths to a deep global brine or mud layer and shallow briny intrusions on Ceres simultaneously.
Article
Astronomy & Astrophysics
Marshall J. Styczinski, Erika M. Harnett
Summary: This study investigates the complex induced magnetic field from a near-spherical conductor, expanding the outer boundary in spherical harmonics. The results demonstrate that each perturbation harmonic induces discrete magnetic moments that are independent and can be simply superimposed. This allows for magnetic studies considering non-spherical oceans of satellites for the first time.
Article
Astronomy & Astrophysics
Jorge I. Zuluaga, Mario Sucerquia
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
Jorge I. Zuluaga, Sebastian Bustamante
PLANETARY AND SPACE SCIENCE
(2018)
Article
Geosciences, Multidisciplinary
Gloria A. Moncayo, Jorge I. Zuluaga, Gaspar Monsalve
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2019)
Article
Astronomy & Astrophysics
Bayron Portilla-Revelo, Jorge I. Zuluaga
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Geochemistry & Geophysics
Gloria A. Moncayo, Gaspar Monsalve, Jorge Zuluaga
Article
Astronomy & Astrophysics
Mario Sucerquia, Jaime A. Alvarado-Montes, Jorge Zuluaga, Nicolas Cuello, Cristian Giuppone
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
J. Zuluaga, M. Tangmatitham, P. Cuartas-Restrepo, J. Ospina, F. Pichardo, S. A. Lopez, K. Pena, J. M. Gaviria-Posada
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Mario Sucerquia, Vanesa Ramirez, Jaime A. Alvarado-Montes, Jorge Zuluaga
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Jaime A. Alvarado-Montes, Mario Sucerquia, Carolina Garcia-Carmona, Jorge Zuluaga, Lee Spitler, Christian Schwab
Summary: The study investigates the fate of ultra-short-period planets and the time-varying spin-orbit angular momentum exchange in star-planet systems. It discusses the implications for observing orbital decay in USP planets and highlights the sensitivity of assumptions about the dissipative properties of the system.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Biology
Laura I. Tenelanda-Osorio, Juan L. Parra, Pablo Cuartas-Restrepo, Jorge I. Zuluaga
Summary: Enceladus is a potential target for astrobiological missions due to its salty ocean and possible hydrothermal vents that may support the survival of methanogens. Research suggests that the environmental conditions on Enceladus are similar to those on Earth where methanogens thrive.
Article
Astronomy & Astrophysics
J. I. Zuluaga, M. Sucerquia, J. A. Alvarado-Montes
Summary: Researchers have developed a model named Pryngles to simulate the light curve of exoplanetary rings, which can describe the optical properties of complex systems and have been compared against existing tools and analytical models for validation.
ASTRONOMY AND COMPUTING
(2022)
Article
Astronomy & Astrophysics
Agustin Vallejo, Jorge Zuluaga, German Chaparro
Summary: On April 13, 2029, asteroid Apophis will pass by Earth, providing a unique opportunity for studying the asteroid at a close distance. This paper analyzes the conditions for observing the asteroid with bistatic radar technique, compiling a list of global observatories that could participate in radar observation campaigns. It is found that a global collaboration of observatories can produce high-resolution radar images and potentially allow for amateur detection of signals from large observatories.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Jorge I. Zuluaga, Pablo A. Cuartas-Restrepo, Jonathan Ospina, Mario Sucerquia
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Jorge Zuluaga, Oscar Sanchez-Hernandez, Mario Sucerquia, Ignacio Ferrin
ASTRONOMICAL JOURNAL
(2018)
Article
Astronomy & Astrophysics
Mario Sucerquia, Jaime A. Alvarado-Montes, Jorge Zuluaga, Matias Montesinos, Amelia Bayo
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Maria Angeles Lopez-Cayuela, Maria-Paz Zorzano, Juan Luis Guerrero-Rascado, Carmen Cordoba-Jabonero
Summary: The atmospheric dust cycle on Mars plays a dominant role in the planetary radiative balance, atmospheric photochemistry escape, and redistribution of materials on the surface. A methodology is presented to accurately describe the annual dust redistribution cycle on Mars using orbital global and seasonal measurements of atmospheric dust opacity. The analysis shows that approximately 4 trillion kilograms of dust is transported globally in the atmosphere during a typical Mars year.
Article
Astronomy & Astrophysics
Audrey Vorburger, Shahab Fatemi, Shane R. Carberry Mogan, Andre Galli, Lucas Liuzzo, Andrew R. Poppe, Lorenz Roth, Peter Wurz
Summary: The study presents new model results for the composition of Ganymede's atmosphere, finding that sublimation remains the major source process for H2O, while radiolysis induced by auroral electrons dominates the source fluxes for O2 and H2.
Article
Astronomy & Astrophysics
Qi He, Zhi Cao, Yuqi Qian, Hejiu Hui, Ioannis Baziotis, Long Xiao, Zaicong Wang, Biji Luo, Yiheng Li, Zongjun Ying, Yang Li
Summary: The Chang'e-5 mission collected lunar soil containing magnesian troctolitic granulites, which provide valuable information on the composition of the lunar crust. Through analysis and modeling, it is suggested that these granulites may have originated from the Pythagoras crater and were transported to the landing site.
Article
Astronomy & Astrophysics
Jordan M. Bretzfelder, Kathryn M. Stack, Abigail A. Fraeman, Mackenzie Day, William E. Dietrich, Alexander B. Bryk
Summary: This study investigates the development of bedrock ridges on Mars and their implications for wind history, deposition, and erosion in Gale crater.
Article
Astronomy & Astrophysics
Lot Ram, Diptiranjan Rout, Rahul Rathi, Paul Withers, Sumanta Sarkhel
Summary: This study investigates the impacts of interplanetary coronal mass ejections (ICMEs) on the Martian ionosphere, specifically the behavior of the ionospheric peak density and height during ICME passages. The study used observations from the Radio Occultation Science Experiment (ROSE) aboard the MAVEN spacecraft and selected 8 ICMEs from existing catalogs. The results show that ICMEs lead to an elevation of the ionospheric peak height and a decrease in peak density, and propose that vertical pressure gradient and electron temperature enhancement are plausible causes for ionospheric variability.
Article
Astronomy & Astrophysics
Benoit Jabaud, Riccardo Artoni, Gabriel Tobie, Erwan Le Menn, Patrick Richard
Summary: The Cassini spacecraft discovered active jets of water vapour and ice grains at the South Pole of Enceladus, resulting in the deposit of freshly erupted materials on the moon's icy surface. Similar processes may be happening on Europa as well. Determining the mechanical properties of fresh icy powder-like materials is essential for future landing and sampling missions. The flowability and surface energy of ice powders decrease with increasing temperatures, which may have implications for stable landing and the flow of ice materials on Enceladus and Europa.
Article
Astronomy & Astrophysics
Lydie Bonal, Eric Quirico, Gilles Montagnac, Mutsumi Komatsu, Yoko Kebukawa, Hikaru Yabuta, Kana Amano, Jens Barosch, Laure Bejach, George D. Cody, Emmanuel Dartois, Alexandre Dazzi, Bradley De Gregorio, Ariane Deniset-Besseau, Jean Duprat, Cecile Engrand, Minako Hashiguchi, Kanami Kamide, David Kilcoyne, Zita Martins, Jeremie Mathurin, Smail Mostefaoui, Larry Nittler, Takuji Ohigashi, Taiga Okumura, Laurent Remusat, Scott Sandford, Miho Shigenaka, Rhonda Stroud, Hiroki Suga, Yoshio Takahashi, Yasuo Takeichi, Yusuke Tamenori, Maximilien Verdier-Paoletti, Shohei Yamashita, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Ryuji Okazaki, Hisayoshi Yurimoto, Shogo Tachibana, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Kanako Sakamoto, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makota Yoshikawa
Summary: This paper focuses on characterizing the thermal history of asteroid Ryugu by studying the structure of polyaromatic carbonaceous matter in the returned samples. The study finds that there is no structural difference in the polyaromatic component between the two sampling sites on Ryugu, indicating that the thermal metamorphism related to radioactive decay was not significant. However, some structural variability is observed within the particle set.
Article
Astronomy & Astrophysics
M. Luginin, A. Fedorova, D. Belyaev, F. Montmessin, O. Korablev, J. -l. Bertaux
Summary: Spectroscopic solar occultation measurements by the SPICAV/SOIR instrument onboard the Venus Express orbiter provided new data on the upper haze aerosol properties, its distribution, and variations. A joint analysis of data from two spectrometers revealed a bimodal distribution in about 50% of observations previously believed to be unimodal, and characterized the size distribution 10 km higher in the atmosphere compared to previous analysis.
Article
Astronomy & Astrophysics
A. Mahieux, S. Viscardy, K. L. Jessup, F. P. Mills, L. Trompet, S. Robert, S. Aoki, A. Piccialli, A. C. Vandaele
Summary: We report on the mean upper limit number densities and volume concentrations of H2CO, O-3, NH3, HCN, N2O, NO2, NO, and HO2 at the Venus terminator above the cloud layer. Attempts to detect these species using a statistical algorithm and the method presented by Trompet et al. (2021) were unsuccessful, and upper limits of detection are provided.
Article
Astronomy & Astrophysics
P. M. Streeter, S. R. Lewis, M. R. Patel, J. A. Holmes, K. Rajendran
Summary: The northern polar vortex on Mars shows a high degree of interannual repeatability in its structure and evolution, except during large dust storms. The seasonal timing of these storms seems to be the key factor determining their impacts on the polar vortex.
Article
Astronomy & Astrophysics
Michael T. Mellon, Hanna G. Sizemore, Jennifer L. Heldmann, Christopher P. McKay, Carol R. Stoker
Summary: The search for life is a major focus of Mars exploration, with temperature and water activity being key factors for habitability. The most recent habitable conditions occurred about 510 kyrs ago and lasted for about 10s of kyrs each occurrence. All latitudes offer potential for life exploration, but middle-latitude sites have access to 100-kyr-old ice that experienced past habitable conditions, while high-latitude sites offer access to ancient ice over 1 Myrs old.
Article
Astronomy & Astrophysics
Anthony Ozerov, Jeffrey C. Smith, Jessie L. Dotson, Randolph S. Longenbaugh, Robert L. Morris
Summary: The Geostationary Lightning Mapper (GLM) instruments, with their large combined field of view, are useful for studying the population of atmospheric phenomena like bolides. However, there are biases when using GLM for non-lightning purposes, which need to be studied and accounted for before precise measurements of bolide flux can be obtained. A Bayesian Poisson regression model was developed to estimate instrumental biases and the latitudinal variation of bolide flux concurrently. The estimated bias corresponds to the known sensitivity of the GLM instruments, and the latitudinal flux variation estimates are consistent with a strong bias towards high-velocity bolides, as compared to existing theoretical models.
Article
Astronomy & Astrophysics
P. Beck, P. Y. Meslin, A. Fau, O. Forni, O. Gasnault, J. Lasue, A. Cousin, S. Schroeder, S. Maurice, W. Rapin, R. C. Wiens, A. M. Ollila, E. Dehouck, N. Mangold, B. Garcia, S. Schwartz, W. Goetz, N. Lanza
Summary: Analysis of data obtained by ChemCam on Mars reveals that the carbon signal is mainly related to ionization of the atmosphere, with variability potentially linked to the physical state of the atmosphere. Up to sol 3355, no carbonate was detected in the ChemCam dataset, suggesting that it is not a major constituent (>50%) in the analyzed targets and that carbon in soils is not enriched beyond the limit of detection. The dominant salts found in Gale are sulfate and chlorides, while the absence of carbonates, seen in Jezero, may be due to differences in protolith.
Article
Astronomy & Astrophysics
Eloy Pena-Asensio, Jaakko Visuri, Josep M. Trigo-Rodriguez, Hector Socas-Navarro, Maria Gritsevich, Markku Siljama, Albert Rimola
Summary: The observation of interstellar objects 1I/'Oumuamua and 2I/Borisov suggests the existence of a larger population of smaller projectiles that impact our planet with unbound orbits. A statistical evaluation of uncertainties in the CNEOS database and study of its hyperbolic fireballs reveals an anisotropic geocentric radiant distribution and low orbital inclinations, challenging the assumption of a randomly incoming interstellar population. These findings suggest that apparent interstellar meteors may, in fact, be the result of accelerated meteoroid impacts caused by close encounters with massive objects within or passing through our solar system.
Article
Astronomy & Astrophysics
Cecilia W. S. Leung, Leslie K. Tamppari, David M. Kass, German Martinez, Erik Fischer, Michael D. Smith
Summary: Using a combination of orbital and surface observations, this study investigates the vertical distribution of water vapor in the lower atmospheres of Mars. The findings suggest that the assumption of uniformly mixed water vapor in the boundary layer is not always consistent with observational constraints. The results provide important insights into the seasonal transport of water and the role of regolith-atmospheric exchange.