Search Publications
Relations among eruptive prominence properties, flare evolution and CME kinematics in large solar energetic particle events
Koleva, K.; Duchlev, P.; Dechev, M.
We report a detailed study of the relationship between solar filament eruption, flare productivity and CME kinematics relevant to Solar Energetic Particle (SEP) events. We analyze kinematics and morphological behaviors of 32 filament eruptions appearing during the Solar Cycle 24, between Aug 14, 2010 and April 18, 2016. For our analysis a high res…
Charge Exchange Ion Losses in Saturn's Magnetosphere
Clark, G.; Kollmann, P.; Sontag, A.
While various source and loss processes have been proposed for ions in Saturn's magnetosphere, it is not yet well understood what role they play in different regions. In this study, we use a physical model of charge exchange to predict how proton and water group ion intensity profiles evolve over time and compare the results to MIMI/CHEMS measurem…
Herbig Ae/Be Stars toward the Dark Cloud LDN 1667
Pereira, C. B.; Marcolino, W. L. F.; Miranda, L. F.
We report the discovery of a new emission-line object, named SPH 4-South = (GAIA EDR3 5616553300192230272), toward the dark cloud LDN 1667. This object came to our attention after inspecting public images that show a faint diffuse nebula a few arcseconds south of SPH 4, an emission-line object previously classified as a T Tauri star. We present hi…
New giant planet beyond the snow line for an extended MOA exoplanet microlens sample
Skowron, Jan; Fukui, Akihiko; Sumi, Takahiro +28 more
Characterizing a planet detected by microlensing is hard if the planetary signal is weak or the lens-source relative trajectory is far from caustics. However, statistical analyses of planet demography must include those planets to accurately determine occurrence rates. As part of a systematic modelling effort in the context of a >10-yr retrospe…
Possibility of concentration of nonvolatile species near the surface of comet 67P/Churyumov-Gerasimenko
Nomura, H.; Majumdar, L.; Suzuki, T. +4 more
Context. Cometary materials are thought to be the reservoir of the primitive materials of the Solar System. The recent detection of glycine and CH3NH2 by the ROSINA mass spectrometer in the coma of 67P/Churyumov-Gerasimenko suggests that amino acids and their precursors may have formed in an early evolutionary phase of the So…
Trace species in planetary atmospheres: Some results of TGO ExoMars
Korablev, O. I.
The presence of life alters the composition of a planet's atmosphere. This thesis, formulated back in the 1960s, is now gaining importance. The discovery or even suspicion of chemically non-equilibrium compounds in the atmosphere of another planets can infl uence space policies. The report reviews the discovery of phosphine on Venus and its possib…
New results for FBS late-type stars using Gaia EDR3 data
Lebzelter, T.; Gigoyan, K. K.; Kostandyan, G. R. +3 more
We study in this paper bright late-type giants found in the First Byurakan Survey (FBS) data base. Phase dependent light-curves from large sky area variability data bases such as Catalina Sky Survey (CSS) and All-Sky Automated Survey for Supernovae (ASAS-SN), and the early installment of the third Gaia data release (Gaia EDR3) photometric and astr…
Long-term Evolution of the Short-term X-Ray Variability of the Jetted TDE Swift J1644+57
Jin, Chichuan
The short-term X-ray variability of tidal disruption events (TDEs) and its similarities with that of active galactic nuclei are poorly understood. In this work, we show the diversity of TDEs' short-term X-ray variability, and take Swift J1644+57 as an example to study the evolution of various properties related to the short-term X-ray variability,…
GLACE survey: Galaxy activity in ZwCl0024+1652 cluster from strong optical emission lines
Sánchez-Portal, Miguel; Pintos-Castro, Irene; Beyoro-Amado, Zeleke +9 more
Although ZwCl0024+1652 galaxy cluster at z ∼ 0.4 has been thoroughly analysed, it lacks a comprehensive study of star formation and nuclear activity of its members. With GaLAxy Cluster Evolution (GLACE) survey, a total of 174 H α emission-line galaxies (ELGs) were detected, most of them having [N II]. We reduced and analysed a set of [O III] and H…
Deciphering the 3D Orion Nebula-IV: The HH 269 Flow Emerges from the Orion-S Embedded Molecular Cloud
Abel, N. P.; O'Dell, C. R.; Ferland, G. J.
We have extended the membership and determined the 3D structure of the large (0.19 pc) HH 269 sequence of shocks in the Orion Nebula. All of the components lie along a track that is highly tilted to the plane of the sky and emerge from within the Orion-S embedded molecular cloud. Their source is probably either the highly obscured mm 9 source asso…