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MG1-688432: A Peculiar Variable System
Corbally, Christopher J.; Kraus, Adam L.; Tucker, Roy A. +3 more
The short-period variable star MG1-688432 has been discovered to exhibit occasional extremely high energy optical outbursts as high as 1038 erg. Outbursts are typically several hours in duration. These events are often highly structured, resembling sequential associated releases of energy. Twenty years of time sequence photometry are pr…
New Spectral Analysis Results Within the Scope of Extended Matter Research in the AR Lacertae Active Binary System
Ekmekçi, F.; Karakuş, O.
Within the scope of extended matter research, we present new spectral analysis results of an active binary system, AR Lac. The low and high resolution spectra of this system, were taken during the period 2013-2016. The evaluation of low dispersion spectra together with the B, V, Rc, Ic and WISE photometric data showed that AR…
Characterizing Magnetic Connectivity of Solar Flare Electron Sources to STEREO Spacecraft Using ADAPT-WSA Modeling
Arge, C. N.; Henney, C. J.; Kahler, S. W. +1 more
Onsets and intensity profiles of six energetic (E > 30 keV) electron events common to STEREO A and B (STA and STB) spacecraft were analyzed by Klassen et al. with the STEREO Solar Electron and Proton Telescopes when the spacecraft were separated by <70° in solar longitude. All six events were characterized by earlier onsets and higher peak i…
An empirical model of energetic electrons in Saturn's magnetosphere based on Cassini data
Zhang, Lei; Wang, Jian-zhao; Huo, Zhuo-xi
Based on one-hour average data observed by the MIMI/LEMMS instrument onboard the Cassini spacecraft from 2004 to 2017, we present an empirical model of energetic electrons (27 keV-1937 keV) in Saturn's magnetosphere. This model distinguishes between two different regions. In the inner magnetosphere (<20RS, RS = 60268 km is…
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…