Search Publications
Repeated and Long-Lasting Fault Activation on Amazonian Mars as Demonstrated by Tectonically Induced Landslides
Fawdon, P.; Balme, M. R.; Rothery, D. A. +1 more
We identify and analyze a large shortening structure (surface expression of a thrust fault) in western Arabia Terra, Mars, exhibiting recent, repeated, and long-lasting tectonic activity. Where the fault system deforms Marsabit crater rim, four landslides with differing degradation states extend onto the crater floor. We propose these were trigger…
JCMT 850 µm Continuum Observations of Density Structures in the G35 Molecular Complex
Tsai, Chao-Wei; Sanhueza, Patricio; Tej, Anandmayee +32 more
Filaments are believed to play a key role in high-mass star formation. We present a systematic study of the filaments and their hosting clumps in the G35 molecular complex using James Clerk Maxwell Telescope SCUBA-2 850 µm continuum data. We identified five clouds in the complex and 91 filaments within them, some of which form 10 hub–filamen…
Mapping "Brain Terrain" Regions on Mars Using Deep Learning
Zhao, Daniel; Noe, Eldar; Morgan, Alexander M. +2 more
One of the main objectives of the Mars Exploration Program is to search for evidence of past or current life on the planet. To achieve this, Mars exploration has been focusing on regions that may have liquid or frozen water. A set of critical areas may have seen cycles of ice thawing in the relatively recent past in response to periodic changes in…
Martian paleolake outlet canyons - Evidence for controls on valley network formation
Sefton-Nash, Elliot; Miguel, Yamila; Diamant, Sharon J. M. +1 more
Martian valley networks (VNs) have been viewed as one of the most compelling pieces of evidence for ancient fluvial activity during the Late Noachian and Early Hesperian periods (3.7-3.5 Ga), likely as a result of precipitation (snowfall/rainfall). During this period, paleolakes also formed, predominantly due to water accumulation within impact cr…
Investigation of X-band and Ka-band amplitude scintillation based on measurement data collected during ESA's BepiColombo superior solar conjunction campaign
Chen, Shun-Ping; Lanucara, Marco; Villalvilla, Jose
Solar phase scintillation and solar amplitude scintillation are fundamentally important in deep space mission operations for designing a communication system capable of transmitting signals when the signal path is close to the Sun. The ESA's BepiColombo measurement data were analyzed in a previous paper in terms of the power spectral density of th…
Characterizing High-Energy Solar Proton Events with Energies Below and Above 100 MeV
Vainio, Rami; Valtonen, Eino; Al-Sawad, Amjad +1 more
We analyzed 58 high-energy proton events that occurred during the years 1996 – 2022. In 32 out of the 58 (55%) events, the proton energies extended up to
FAST Observations of Four Comets to Search for the Molecular Line Emissions between 1.0 and 1.5 GHz Frequencies
Tsai, Chao-Wei; Duan, Yan; Li, Di +11 more
We used the Five-hundred-meter Aperture Spherical radio Telescope (FAST) to search for the molecular emissions in the L-band between 1.0 and 1.5 GHz toward four comets, C/2020 F3 (NEOWISE), C/2020 R4 (ATLAS), C/2021 A1 (Leonard), and 67P/Churyumov-Gerasimenko during or after their perihelion passages. Thousands of molecular transition lines fall i…
X-ray reprocessing: Through the eclipse spectra of low mass X-ray binaries with XMM-Newton
Paul, Biswajit; Aftab, Nafisa
Eclipsing X-ray binaries make an ideal condition to study reprocessed X-rays, as the X-rays detected during eclipse are purely reprocessed while the much brighter primary X-rays are blocked by the companion star. We carried out a comprehensive study of X-ray reprocessing with four eclipsing Low Mass X-ray Binary (LMXB) systems by comparing X-ray s…
Applying machine learning to a nonlinear spectral mixing model for mapping lunar soils composition using CHANDRAYAAN-1 M3 data
Mall, Urs; Surkov, Yehor; Kaydash, Vadym +4 more
We present a newly developed method which combines the nonlinear spectral mixing model of Shkuratov et al. (1999) with a machine learning algorithm to map the lunar regolith composition using spectral data. The new method performs orders of magnitude faster than the traditionally used numerical optimization approaches, allowing the mapping of rego…
Cosmological insights into the early accretion of r-process-enhanced stars: II. Dynamical identification of lost members of Reticulum II
Berczik, Peter; Mardini, Mohammad; Ishchenko, Maryna +1 more
Aims. We identify the possible dynamical connection between individual r-process-enhanced stars and the ultra-faint dwarf galaxy Reticulum II based on the current phase-space information for these stars and the dynamical mass-loss model of Reticulum II during its orbital motion for 11.5 Gyr of lookback time. The dynamical orbital modelling togethe…