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Astronomy & Astrophysics
Ezgi Yoldas, Hasan Ali Dal, Orkun Ozdarcan
Summary: Based on the analysis of Kepler data and photometric observations, new findings about KIC 5217733 and KIC 11671429, two highly eccentric detached eclipsing binaries, are presented. The radii and masses of the primary and secondary components, as well as the dominant modes of pulsations, were estimated for both targets.
Article
Astronomy & Astrophysics
I. J. Lima, A. C. Mattiuci, G. J. M. Luna, A. S. Oliveira, C. V. Rodrigues, N. Palivanas, N. E. Nunez
Summary: We analyzed publicly available X-ray and optical observations of TYC 7275-1968-1, a contact binary, red nova progenitor candidate. Our analysis of the long optical time series enabled us to improve its orbital period, and we detected an X-ray and UV source associated with TYC 7275-1968-1. The presence of X-rays and modulated UV emission suggests chromospheric activity in both components of the binary.
Article
Astronomy & Astrophysics
Birol Gurol
Summary: In this study, we analyzed the BD UMi system using TESS observations and found that one of the components exhibits gamma Doradus type pulsation. We detected g-mode pulsations related to the pulsation and obtained the physical and geometrical parameters of the components through the analysis of the light curve. The amplitude and frequency of the pulsation were found to be variable. This is the first detailed analysis of the BD UMi system.
Article
Astronomy & Astrophysics
Shanti Priya Devarapalli, Rukmini Jagirdar, Ravi Raja Pothuneni, Dereje Wakgari Amente, Vineet Thomas, Margarita Safonova, Noah Brosch
Summary: This study presents a photometric analysis of five binary stars in the galactic globular cluster M4, using the Wilson-Devinney method and M-R diagram to analyze their properties and evolutionary state. Additionally, a three-dimensional Vector-Point Diagram was built to evaluate the cluster membership of these variable stars.
Article
Astronomy & Astrophysics
Mohammed Abu Saleem, Ali Taani
Summary: This paper investigates the properties and behavior of chaotic anti-de Sitter (AdS) black hole space, as well as its correlation with chaotic deformation retract. The Lagrangian equations are used to determine the geodesics of the chaotic AdS space, and various types of chaotic quantum retractions in this space are identified. Exploring these ideas has increased our understanding of the complex dynamics of the universe and the potential for developing a theory of quantum gravity that combines the principles of general relativity and quantum mechanics.
Article
Astronomy & Astrophysics
Neslihan Alan
Summary: The fundamental parameters of the component stars in the V1175 Cas binary system were determined through simultaneous analysis of TESS light curve and CCD observations, resulting in the determination of masses, radii, distance, and age of the system.
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
Amos Mathias, Jefta M. Sunzu, Jason M. Mkenyeleye
Summary: In this study, a core-envelope stellar model with anisotropic fluid distribution satisfying the Karmarkar condition is generated. The validity of the model is confirmed through physical and stability tests, and the radii and masses of astrophysical objects consistent with observations are obtained.
Article
Astronomy & Astrophysics
Yanxiao Liu, Yuanyuan Niu, Daoyi He, Guangyou Fang
Summary: This study analyzes the movement of magnetic flux in photospheric magnetic bright points (PBPs) and finds that the flux can move rapidly with horizontal velocity even faster than the observed footpoints. It also discovers differences in instantaneous velocities calculated by vertical flux and by intensity for the same flux tubes.
Article
Astronomy & Astrophysics
Francis A. Cucinotta, Sungmin Pak
Summary: In this paper, the NASA Space Cancer Risk (NSCR version 2022) model is used to predict the risks of cancer and circulatory diseases caused by the largest observed solar particle events (SPEs) in the space age. The contribution of galactic cosmic rays (GCRs) to the risks is also considered. The results show that with proper shielding, the risks can be mitigated, and the annual GCR risks are predicted to surpass the risks from large SPEs.
LIFE SCIENCES IN SPACE RESEARCH
(2024)
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
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
Berhe Tewelde Teklehaimanot, Yikdem Mengesha Gebrehiwot
Summary: This study investigates the relative proper motions of eight A-F type runaway candidate stars in the 30 Dor region of the Large Magellanic Cloud using Gaia DR3 data. The results show that five stars are runaway stars in the tangential plane of the 30 Dor region, and the remaining three stars may be unresolved binaries.
Article
Astronomy & Astrophysics
Igor Andreoni, Michael W. Coughlin, Alexander W. Criswell, Mattia Bulla, Andrew Toivonen, Leo P. Singer, Antonella Palmese, E. Burns, Suvi Gezari, Mansi M. Kasliwal, R. Weizmann Kiendrebeogo, Ashish Mahabal, Takashi J. Moriya, Armin Rest, Dan Scolnic, Robert A. Simcoe, Jamie Soon, Robert Stein, Tony Travouillon
Summary: Binary neutron star mergers and neutron star-black hole mergers can be detected through gravitational waves and electromagnetic radiation. Discovering kilonovae will provide valuable insights into element nucleosynthesis and nuclear matter. The unique features of the Nancy Grace Roman Space Telescope allow for the detection of gravitational wave counterparts missed by optical telescopes.
ASTROPARTICLE PHYSICS
(2024)
Article
Astronomy & Astrophysics
L. R. Colaco, R. F. L. Holanda, Rafael C. Nunes, J. E. Gonzalez
Summary: Motivated by future gravitational wave observations, this study performs forecast analysis to constrain a possible time variation of the fine structure constant a. By considering mock data from standard sirens and current observations of strong gravitational lensing systems, it is found that future standard sirens observations can also play a significant role in the search for variations of a.
ASTROPARTICLE PHYSICS
(2024)
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
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
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
Yi Liu, Jing Jin, Hongyang Zhao
Summary: As radio telescope technology advances, the identification of pulsars becomes more important. This research proposes a method that combines a Vector Quantized Variational Autoencoder with a Gated PixelCNN to balance the number of pulsar and non-pulsar samples. A Residual Neural Network model is then established to classify and identify pulsar candidates based on two feature diagnostic plots. The proposed model shows high recall, accuracy, and F1-scores, demonstrating its effectiveness.
Article
Astronomy & Astrophysics
Cornelia Arcaro, Michele Doro, Julian Sitarek, Dominik Baack
Summary: In this report, the performance of replacing PMTs with SiPMs in a 3rd generation IACT array (using MAGIC as an example) is investigated using generalized simulations. It is found that the use of SiPMs can improve sensitivity by a factor of three at the current trigger threshold energy, and the stronger sensitivity of SiPMs in the red part of the spectrum does not affect the performance of IACTs, which is a source of background.
ASTROPARTICLE PHYSICS
(2024)
