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A modeling approach for water and sediment transport in Jezero crater on Mars based on new geomorphological evidence
Postberg, Frank; Jaumann, Ralf; Gross, Christoph +3 more
In our study we examined water-related processes and events in the Jezero crater on Mars using flow discharge and sediment transport models of: 1) the western inlet valley carving, 2) the northern inlet valley carving, 3) crater flooding by only northern inlet and 4) by both northern and western inlets, 5) erosion of the western rim by the western…
Analysis of Solar Eruptions Deflecting in the Low Corona: Influence of the Magnetic Environment
Vourlidas, Angelos; Mac Cormack, Cecilia; Sahade, Abril
Coronal mass ejections (CMEs) can exhibit nonradial evolution. The background magnetic field is considered the main driver for the trajectory deviation relative to the source region. The influence of the magnetic environment has been largely attributed to the gradient of the magnetic pressure. In this work, we propose a new approach for investigat…
Fast-rotating A- and F-type Stars with Hα Emissions in NGC 3532: Candidate UV-dim Stars?
Li, Gang; Li, Chengyuan; He, Chenyu
Extended main-sequence stars that are dim in the ultraviolet passbands of the Hubble Space Telescope (UV-dim stars) are found in several young and intermediate-age star clusters in the Magellanic Clouds (MCs). The obscuring of the dust in the disks of stars expelled as a result of fast rotation has been suggested to be responsible for the appearan…
Investigating pulsating variables and eclipsing binaries in NGC 2126 using ground- and space-based photometry, astrometry, spectroscopy, and modelling
Panwar, Neelam; Joshi, Santosh; Joshi, Yogesh C. +12 more
Pulsating variables are prevalent in the classical
Venus' O 5577 Å Oxygen Green Line: A Global Diffuse Proton-Induced Aurora
Tellmann, Silvia; Pätzold, Martin; Peter, Kerstin +5 more
The Venusian O(1S–1D) 5577 Å "oxygen green line" has been an enigmatic feature of the Venusian atmosphere since its first attempted observation by the Venera spacecraft. Its first detection in 1999 and subsequent detections point to a unique auroral phenomena. However, the lack of (1D–3P) 6300 Å "oxygen …
Magnetosonic waves in the Martian ionosphere driven by upstream proton cyclotron waves: Two-point observations by MAVEN and Mars Express
Halekas, J. S.; Fowler, C. M.; Collinson, G. +5 more
Recent observations from the Mars Atmosphere and Volatile EvolutioN (MAVEN) and Mars Express (MEX) spacecraft have suggested that pressure pulses originating from upstream proton cyclotron waves (PCWs) can "ring" the Martian magnetopause at the same frequency and drive magnetosonic waves in the upper ionosphere of Mars, thereby transporting energy…
Orbital and Atmospheric Modeling of H II 1348B: An Eccentric Young Substellar Companion in the Pleiades
Wagner, Kevin; Stone, Jordan; Ertel, Steve +4 more
Brown dwarfs with known physical properties (e.g., age and mass) are essential for constraining models of the formation and evolution of substellar objects. We present new high-contrast imaging observations of the circumbinary brown dwarf H II 1348B—one of the few known substellar companions in the Pleiades cluster. We observed the system in the i…
Spectral properties of the neutron star low-mass X-ray binaries 4U 1636–53, XTE J1739–285, and MAXI J1816–195
García, Federico; Zhang, Guobao; Lyu, Ming +2 more
We investigated simultaneous NICER plus NuSTAR observations of the three neutron star low-mass X-ray binaries 4U 1636–53, XTE J1739–285, and MAXI J1816–195 using the latest reflection models. The seed photons in our models that are fed into the corona originated from either the neutron star (NS) or the accretion disk. We found that for the sources…
The aluminium-26 distribution in a cosmological simulation of a Milky Way-type Galaxy
Yagüe López, A.; Lugaro, M.; Wehmeyer, B. +1 more
Context. The 1.8 MeV γ-rays corresponding to the decay of the radioactive isotope 26Al (with a half-life of 0.72 Myr ) have been observed by the SPI detector on the INTEGRAL spacecraft and extensively used as a tracer of star formation and current nucleosynthetic activity in the Milky Way Galaxy. Further information is encoded in the ob…
Quantifying lava surface heterogeneity on Mars using THEMIS brightness temperature data
Ramsey, M. S.; McKeeby, B. E.; Peterson, T.
The analysis and characterization of any planetary surface relies heavily on orbital data. The Martian surface is dominated by extrusive volcanism with most of the younger rocks being either too rough or at altitudes that are commonly inaccessible to landers or rovers. Therefore, the accurate interpretation of orbital data is critical to understan…