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X-ray reprocessing: Through the eclipse spectra of low mass X-ray binaries with XMM-Newton
Paul, Biswajit; Aftab, Nafisa
Eclipsing X-ray binaries make an ideal condition to study reprocessed X-rays, as the X-rays detected during eclipse are purely reprocessed while the much brighter primary X-rays are blocked by the companion star. We carried out a comprehensive study of X-ray reprocessing with four eclipsing Low Mass X-ray Binary (LMXB) systems by comparing X-ray s…
Applying machine learning to a nonlinear spectral mixing model for mapping lunar soils composition using CHANDRAYAAN-1 M3 data
Mall, Urs; Surkov, Yehor; Kaydash, Vadym +4 more
We present a newly developed method which combines the nonlinear spectral mixing model of Shkuratov et al. (1999) with a machine learning algorithm to map the lunar regolith composition using spectral data. The new method performs orders of magnitude faster than the traditionally used numerical optimization approaches, allowing the mapping of rego…
Cosmological insights into the early accretion of r-process-enhanced stars: II. Dynamical identification of lost members of Reticulum II
Berczik, Peter; Mardini, Mohammad; Ishchenko, Maryna +1 more
Aims. We identify the possible dynamical connection between individual r-process-enhanced stars and the ultra-faint dwarf galaxy Reticulum II based on the current phase-space information for these stars and the dynamical mass-loss model of Reticulum II during its orbital motion for 11.5 Gyr of lookback time. The dynamical orbital modelling togethe…
Spectral study of the planetary nebula NGC 2452
Ali, A.; Snaid, S.; Alruhaili, A.
We provide a detailed study for the Galactic planetary nebula (PN) NGC 2452, which has long been suspected to be a member of the Galactic cluster NGC 2453. The present study uses integral field unit (IFU) spectroscopic observations of the PN to explore its physical conditions, chemical abundances, kinematical characteristics, and morphological fea…
CMEs evolve in the interplanetary medium to double their predicted geo-effectiveness
Poedts, Stefaan; Mishra, Wageesh; Soni, Shirsh Lata +4 more
Context. We explore the impact of interactions between coronal mass ejections (CMEs) - known as CME-CME interactions - on Earth using remote-sensing and in situ observations and estimate the amplification of the geo-effectiveness of the individual CMEs by a factor of ∼2 due to CME-CME interactions.
Aims: We present 3D reconstructions of inter…
Characterization of the Early Dynamics of Solar Coronal Bright Fronts
Stepanyuk, Oleg; Kozarev, Kamen; Nedal, Mohamed +2 more
We present a comprehensive characterization of 26 Coronal Mass Ejection (CME)-driven compressive waves known as Coronal Bright Fronts (CBFs) observed in the low solar corona between 2010 and 2017. These CBFs have been found to be associated with Solar Energetic Particle (SEP) events near Earth, indicating their importance in understanding space we…
Simultaneous Chandra and HST observations of the quiescent neutron star low-mass X-ray binaries in 47 Tucanae
van den Berg, M.; Heinke, C. O.; Cohn, H. N. +6 more
We present simultaneous Chandra X-ray Observatory and Hubble Space Telescope observations of three certain (X5, X7, W37) and two likely (X4, W17) quiescent neutron star low-mass X-ray binaries (qLMXBs) in the globular cluster 47 Tuc. We study these systems in the X-ray, optical, and near-ultraviolet (NUV) using the simultaneous data and additional…
Correction to: Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior
Cantat-Gaudin, T.; Moitinho, A.; Paunzen, E. +4 more
On the Instrumental Discrepancies in Lyman-Alpha Observations of Solar Flares
Dammasch, Ingolf E.; Milligan, Ryan O.; Greatorex, Harry J.
Despite the energetic significance of Lyman-alpha (Ly
Mineral detection based on hyperspectral remote sensing imagery on Mars: From detection methods to fine mapping
Zhang, Liangpei; Ke, Tian; Zhong, Yanfei +2 more
Hyperspectral remote sensing is a commonly used technical means for mineral detection on the Martian surface, which has important implications for the study of Martian geological evolution and the study for potential biological signatures. The increasing volume of Martian remote sensing data and complex issues such as the intimate mixture of Marti…