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Finding the Normal Direction of Interplanetary Directional Discontinuities—A New Scheme
Wu, D. J.; Yang, L.; Yang, Y. -H. +2 more
Directional discontinuities (DDs) are common structures in the interplanetary space. Correctly determining the normal of a DD is important to understand the changes of phase fronts of magnetic fields adjacent to a discontinuity as well as helpful for the applications in many regimes of space physics research. In this work, we propose a new scheme …
Radial Velocities of Low-mass Candidate TWA Members
Mace, Gregory; Sokal, Kimberly; Kidder, Benjamin +2 more
Nearby young moving groups provide unique samples of similar age stars for testing the evolution of physical properties. Incomplete and/or incorrect group membership classifications reduce the usefulness of the group, which we assume to be coeval. With near-infrared spectra of two candidate members of the TW Hya Association, 2MASS J12354615-411553…
Simultaneous Kepler/K2 and XMM‑Newton observations of superflares in the Pleiades
Antoniou, V.; Micela, G.; Stauffer, J. +9 more
Together with coronal mass ejection, flares are the most energetic stellar magnetic events, ignited by a sudden release of magnetic energy, which triggers a cascade of interconnected phenomena, each resulting in emission in different bands. For this reason, flares are intrinsic multiwavelength phenomena. In particular, optical and soft X‑ray emiss…
Probing the Hill Sphere of (486958) 2014 MU69. II. Hubble Space Telescope Fine Guidance Sensors Observations during the 2018 August 4 Stellar Occultation
Stern, S. Alan; Spencer, John R.; Buie, Marc W. +6 more
We observed the 2018 August 4 stellar occultation by the Kuiper Belt object (486958) 2014 MU69, the first close flyby target of the extended New Horizons mission. Rather than capture a solid-body occultation by the KBO itself, our program aimed to constrain the opacity of rings, moons, or other debris in the nearby environment. We used …
Detection of Crystalline and Fine-grained Calcic Plagioclases on Vesta
Aoki, S.; Oliva, F.; D'Aversa, E. +8 more
Plagioclase feldspars are among the most prevalent minerals in the solar system, and are present in many chondritic and achondritic meteorite families. Nevertheless, spectral features of plagioclases have never been unambiguously and directly observed in remote observations of asteroids. We report here the detection of an absorption band at 12.2 &…
Designing large pixelated CdTe detection planes for hard X-ray transients detection
Bouchet, Laurent; Mate, Sujay; Bajat, Armelle +10 more
In this paper, we discuss the need for very large detection planes for the detection of hard X-ray transients in the multi-messenger era, started with the quasi-simultaneous detection of GRB 170817A by Fermi/GBM and INTEGRAL/SPI and the gravitational waves event GW 170817, detected by the LVC collaboration. After pointing that current and future i…
A Bayesian model for inferring properties of the local white dwarf population in astrometric and photometric surveys
Peiris, Hiranya V.; Widmark, Axel; Mortlock, Daniel J.
The Gaia mission is providing precise astrometry for an unprecedented number of white dwarfs (WDs), encoding information on stellar evolution, Type Ia supernovae progenitor scenarios, and the star formation and dynamical history of the Milky Way. With such a large data set, it is possible to infer properties of the WD population using only astrome…
Numerical Simulation of the Long-Term Thermal Evolution of the Nuclei of Short-Period Comets Using the Nucleus of Comet 67P/Churyumov–Gerasimenko as an Example
Dorofeeva, V. A.; Marov, M. Ya.; Rusol, A. V.
Using numerical models, we have studied what depth of the outer layer the comet nuclei are degassed to when they are in orbits whose perihelion is close to the Sun for tens of years. The problem is topical, because it helps to understand how much the experimentally obtained results on the composition of comet comas depend on how long the comet is …
Features of the Residual Velocity Ellipsoid of Hot Subdwarfs from the Gaia DR2 Catalog
Bobylev, V. V.; Bajkova, A. T.
The evolution of the parameters of the residual velocity ellipsoid of hot subdwarfs (HSDs) with their position relative to the Galactic plane is traced, using the HSDs selected by Geier et al. from the Gaia DR2 catalog. Parameters of the Galactic rotation are determined for two ∣ z∣ zones. These are used to estimate the gradient of the circular ro…
Star clusters in the dwarf irregular galaxy Leo A
Vansevičius, V.; Stonkutė, R.; Čeponis, M. +2 more
Context. Leo A is an isolated gas-rich dwarf irregular galaxy of low stellar mass and metallicity residing at the outskirts of the Local Group. Ages of the stellar populations in Leo A range from ∼10 Myr to ∼10 Gyr. So far, only one star cluster has been discovered in this galaxy.
Aims: Our aim is to search for star cluster candidates in the …