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Xenon Isotopes Identify Large-scale Nucleosynthetic Heterogeneities across the Solar System
Avice, G.; Moreira, M.; Gilmour, J. D.
Nucleosynthetic isotopic anomalies in meteorites and planetary objects contribute to our understanding of the formation of the solar system. Isotope systematics of chondrites demonstrate the existence of a physical separation between isotopic reservoirs in the solar system. The isotopic composition of atmospheric xenon (Xe) indicates that its prog…
Statistical Properties of Habitable Zones in Stellar Binary Systems
Sozzetti, Alessandro; Vladilo, Giovanni; Silva, Laura +1 more
Observations of exoplanets and protoplanetary disks show that binary stellar systems can host planets in stable orbits. Given the high binary fraction among stars, the contribution of binary systems to Galactic habitability should be quantified. Therefore, we have designed a suite of Monte Carlo experiments aimed at generating large (up to 10…
Energized Oxygen in the Magnetotail: Current Sheet Bifurcation From Speiser Motion
George, Don E.; Jahn, Jörg-Micha
Oxygen can be a major constituent of magnetospheric plasma, yet the role of oxygen in the magnetosphere is not sufficiently understood. Observations of bifurcated current sheets (BCS) attributed to O+ have been made, yet their origin is not well understood. We examine the case of a thinning current sheet prior to the onset of magnetic r…
Simulation of the Interplanetary Bz Using a Data-driven Heliospheric Solar Wind Model
Feng, Xueshang; Zuo, Pingbing; Wei, Fengsi +1 more
Aimed to be ready for the transition from research to operation, we have developed a solar wind model by coupling a data-driven empirical coronal model with a magnetohydrodynamics heliospheric model. We performed a data-driven simulation of the solar wind for a two-year period during the declining and minimum phases of solar cycle 23. Comparisons …
Global parameters of the totally-eclipsing W UMa stars NSVS 6673994, NSVS 4316778, PP Lac and NSVS 1926064
Popov, Velimir A.; Petrov, Nikola I.; Kjurkchieva, Diana P.
Photometric observations of four totally-eclipsing W UMa binaries, NSVS 6673994, NSVS 4316778, PP Lac and NSVS 1926064, are presented. Their global parameters were determined from the light curve solutions and GAIA distances. The main results are as follows: (i) NSVS 6673994, NSVS 4316778 and PP Lac are of W subtype while NSVS 1926064 is of A subt…
X-Ray Emission and Disk Irradiation of HL Tau and HD 100546
Skinner, Stephen L.; Güdel, Manuel
We present new X-ray observations of the optically obscured protostar HL Tau and the intermediate-mass Herbig Be star HD 100546. Both objects are surrounded by spectacular disks showing complex morphology, including rings and gaps that may have been sculpted by protoplanets. HL Tau was detected as a variable hard X-ray source by Chandra, typical o…
Driving solar coronal MHD simulations on high-performance computers
Bourdin, Philippe-A.
The quality of today's research is often tightly limited to the available computing power and scalability of codes to many processors. For example, tackling the problem of heating the solar corona requires a most realistic description of the plasma dynamics and the magnetic field. Numerically solving such a magneto-hydrodynamical (MHD) description…
Illuminating a tadpole's metamorphosis III: quantifying past and present environmental impact
Reiter, Megan; Garay, Guido; McLeod, Anna F. +3 more
We combine Multi-Unit Spectroscopic Explorer and Atacama Large Millimeter/sub-millimeter Array observations with theoretical models to evaluate how a tadpole-shaped globule located in the Carina Nebula has been influenced by its environment. This globule is now relatively small (radius ~2500 au), hosts a protostellar jet+outflow (HH 900), and, wit…
The Solar Origin of Particle Events Measured by Parker Solar Probe
Vourlidas, Angelos; Poirier, Nicolas; Kouloumvakos, Athanasios +4 more
During the second solar encounter phase of Parker Solar Probe (PSP), two small solar energetic particle (SEP) events were observed by the Integrated Science Investigation of the Sun, on 2019 April 2 and 4. At the time, PSP was approaching its second perihelion at a distance of ∼24.8 million kilometers from the solar center, it was in near-radial a…
CS Depletion in Prestellar Cores
Soam, Archana; Kim, Shinyoung; Kim, Gwanjeong +6 more
The CS molecule is known to be adsorbed onto dust in cold and dense conditions, causing it to be significantly depleted in the central region of cores. This study is aimed to investigate the depletion of the CS molecule using the optically thin {C}34{S} molecular line observations. We mapped five prestellar cores, L1544, L1552, L1689B, …