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Investigation of the Physical Origin of Overionized Recombining Plasma in the Supernova Remnant IC 443 with XMM-Newton
Seta, Masumichi; Uchida, Hiroyuki; Tsuru, Takeshi Go +4 more
The physical origin of the overionized recombining plasmas (RPs) in supernova remnants (SNRs) has been attracting attention because its understanding provides new insight into SNR evolution. However, the process of the overionization, although it has been discussed in some RP-SNRs, is not yet fully understood. Here, we report on spatially resolved…
Properties of Type III and Type IIIb Bursts in the Frequency Band of 8 - 80 MHz During PSP Perihelion at the Beginning of April 2019
Konovalenko, A. A.; Melnik, V. N.; Dorovskyy, V. V. +4 more
Properties of type III and type IIIb bursts in the frequency band of 8 - 80 MHz observed by the radio telescopes Ukrainian Radio Interferometer of NASU-2 (URAN-2) (Poltava) and Giant Ukrainian Radio Telescope (GURT) (Kharkiv) during the Parker Solar Probe (PSP) perihelion in April 2019 are discussed. These correspond to those that were observed by…
TOI-1749: an M dwarf with a Trio of Planets including a Near-resonant Pair
Tamura, M.; Pallé, E.; Béjar, V. J. S. +66 more
We report the discovery of one super-Earth- (TOI-1749b) and two sub-Neptune-sized planets (TOI-1749c and TOI-1749d) transiting an early M dwarf at a distance of 100 pc, which were first identified as planetary candidates using data from the TESS photometric survey. We have followed up this system from the ground by means of multiband transit photo…
Magnetic Connections across the Chromosphere-Corona Transition Region
Judge, Philip
The plasma contributing to emission from the Sun between the cool chromosphere (≤104 K) and hot corona (≥106 K) has been subjected to many different interpretations. Here we look at the magnetic structure of this transition region (TR) plasma, based upon the implications of CLASP2 data of an active region recently published b…
The spatial structure and dynamical state of the open cluster NGC 2112
Gao, Xinhua; Xu, ShouKun; Xue, Lei
This paper investigates the spatial structure and dynamical state of the old open cluster NGC 2112 based on likely cluster members from Gaia Early Data Release 3. Using the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm, we find 1193 likely cluster members down to G ~ 21 mag within a radius of 1.°5 from the cluster …
Using Shell models to investigate clumping in the wind of the O7Iaf + supergiant AzV83
Hillier, D. John; Flores, Brian L.
Hot massive stars exhibit strong stellar winds that enrich the surrounding interstellar medium and affect the stars' evolution. However, the winds are inhomogeneous (clumped) and are difficult to model in radiative transfer codes. To produce more realistic spectra, many codes use a volume-filling factor (VFF) approach to incorporate the effects of…
The Nature of the Eccentric Double-lined Eclipsing Binary System KIC 2306740 with Kepler Space Photometry
Southworth, J.; Koçak, D.; Yakut, K. +4 more
We present a detailed study of KIC 2306740, an eccentric double-lined eclipsing binary system. Kepler satellite data were combined with spectroscopic data obtained with the 4.2 m William Herschel Telescope (WHT). This allowed us to determine precise orbital and physical parameters of this relatively long period (P = 10.3°) and slightly eccentric (…
Density structures in the martian lower thermosphere as inferred by Trace Gas Orbiter accelerometer measurements
Bruinsma, S.; Siddle, A. G.; Mueller-Wodarg, I. C. F. +1 more
ESA's Trace Gas Orbiter (TGO) undertook an aerobraking campaign to lower itself into the required science orbit. We present an overview of densities derived from TGO accelerometer data during aerobraking. With the addition of density data from NASA's MAVEN/NGIMS instrument, we infer that at TGO altitudes (105 km), the atmosphere is driven by dynam…
AstroSat soft X-ray observations of the symbiotic recurrent nova V3890 Sgr during its 2019 outburst
Singh, K. P.; Orio, M.; Ness, Jan-Uwe +3 more
Two long AstroSat Soft X-ray Telescope observations were taken of the third recorded outburst of the symbiotic recurrent nova V3890 Sgr. The first observing run, 8.1-9.9 d after the outburst, initially showed a stable intensity level with a hard X-ray spectrum that we attribute to shocks between the nova ejecta and the pre-existing stellar compani…
Tidally Excited Modes and δ Scuti Pulsations in the Eclipsing Triple Star IM Persei
Hong, Kyeongsoo; Lee, Jae Woo; Kim, Hye-Young
IM Per is a triple star system whose eclipsing pair masses and radii are accurate to within 1%. The Transiting Exoplanet Survey Satellite (TESS) light curve of the program target exhibits partial eclipses and multiple oscillations with millimagnitude-level amplitudes. It is found that the oscillations affect eclipse timing measurements. Binary mod…