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Jitter Radiation as an Alternative Mechanism for the Nonthermal X-Ray Emission of Cassiopeia A
Greco, Emanuele; Vink, Jacco; Ferrigno, Carlo +1 more
Synchrotron radiation from relativistic electrons is usually invoked as responsible for the nonthermal emission observed in supernova remnants. Diffusive shock acceleration is the most popular mechanism to explain the process of particles acceleration and within its framework a crucial role is played by the turbulent magnetic field. However, the s…
Exploring the Origin of Solar Energetic Electrons. I. Constraining the Properties of the Acceleration Region Plasma Environment
Jeffrey, Natasha L. S.; Pallister, Ross
Solar flare electron acceleration is an efficient process, but its properties (mechanism, location) are not well constrained. Via hard X-ray (HXR) emission, we routinely observe energetic electrons at the Sun, and sometimes we detect energetic electrons in interplanetary space. We examine if the plasma properties of an acceleration region (size, t…
Unveiling the chemical fingerprint of phosphorus-rich stars. I. In the infrared region of APOGEE-2
Masseron, Thomas; Hayes, Christian R.; Pignatari, Marco +4 more
Context The origin of phosphorus, one of the essential elements for life on Earth, is currently unknown. Prevalent models of Galactic chemical evolution (GCE) systematically underestimate the amount of P compared to observations, especially at low metallicities. The recently discovered P-rich ([P/Fe] ≳ 1.2 dex) and metal-poor ([Fe/H] ≃ −1.0 dex) g…
Revisiting multiwavelength data on the supersoft X-ray source CAL 83
D'Amico, F.; Jablonski, F.; Stecchini, P. E. +1 more
In this study, we revisit public data on the supersoft X-ray source CAL 83 in the Large Magellanic Cloud. A significant part of our analysis is focused on XMM-Newton X-ray observations, in which updated data reduction procedures and quality assessment were applied. We report on the capability of publicly available hot atmosphere models in describi…
The magnetically controlled ionopause boundary observed by LPW onboard MAVEN within magnetic pile-up region of Mars
Haider, S. A.; Prasad, K. Durga; Shah, Siddhi Y.
We have analysed plasma and magnetic field data obtained from 627 orbits of Mars Atmosphere and Volatile Evolution (MAVEN) that occurred during October 2014, April 2015, September 2017 and May 2018, when the spacecraft was crossing the magnetic pile-up boundary of Mars. Two broad peaks and a drop are observed in this magnetic field region. The mag…
The Environments around W Serpentis Systems: Independent Limits on System Masses and Extended Envelopes
Davidge, T. J.
Information extracted from the Gaia Data Release 3 is used to examine the stellar contents within projected separations of 10 pc from eight close binary systems that are either classical W Serpentis systems or related objects. The goal is to search for remnant star clusters or moving groups with proper motions that are similar to those of the bina…
A method of photometric data extraction for asteroids from time-domain surveys
Muinonen, Karri; Penttilä, Antti; Xiang, Yue +9 more
The lightcurves of asteroids are essential for determining their physical characteristics, including shape, spin, size, and surface composition. However, most asteroids are missing some of these basic physical parameters due to lack of photometric data. Although a few telescopes or surveys are specially designed for photometric lightcurve observat…
NGC 6302: The Tempestuous Life of a Butterfly
Frank, Adam; Balick, Bruce; Kastner, Joel H. +4 more
NGC 6302 (The Butterfly Nebula) is an extremely energetic and rapidly expanding bipolar planetary nebula (PN). If the central source is a single star, then its apparent location in an H-R diagram places it among the most massive, hottest, and presumably rapidly evolving of all central stars of PNe. Our proper motion study of NGC 6302, based on Hub…
Unraveling the Origins and Development of the Galactic Disk through Metal-Poor Stars
Mardini, Mohammad K.; Abushattal, Ahmad A.; Rah, Maria +2 more
The Milky Way is a spiral galaxy comprising three main components: the Bulge, the Disk, and the Halo. Of particular interest is the Galactic disk, which holds a significant portion of the baryonic matter angular momentum and harbors at least two primary stellar populations: the thin and thick disks. Understanding the formation and evolution of the…
Colliding winds in WR21 and WR31 - I. The X-ray view
Nazé, Yaël; Gosset, Eric; Rauw, Gregor +2 more
WR21 and WR31 are two WR + O binaries with short periods, quite similar to the case of V444 Cyg. The XMM-Newton observatory has monitored these two objects and clearly revealed phase-locked variations as expected from colliding winds. The changes are maximum in the soft band (0.5-2.0 keV, variations by a factor 3-4) where they are intrinsically li…