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Multi-spacecraft Observations of the 2022 March 25 CME and EUV Wave: An Analysis of Their Propagation and Interrelation
Telloni, Daniele; Liberatore, Alessandro; Vourlidas, Angelos +5 more
This paper reports on a well-defined EUV wave associated with a coronal mass ejection (CME) observed on 2022 March 25. The CME was observed by Solar Orbiter (SolO) during its first close perihelion (0.32 au) and by several other spacecraft from different viewpoints. The EUV wave was visible by the Extreme Ultraviolet Imager on board the Solar Terr…
Revealing the intrinsic X-ray reverberation lags in IRAS 13224-3809 through the Granger causality test
Chainakun, P.; Young, A. J.; Nakhonthong, N. +1 more
The Granger causality is an econometric test for determining whether one time series is useful for forecasting another one with a certain Granger lag. Here, the light curves in the 0.3-1 keV (reflection dominated, soft) and 1.2-5 keV (continuum dominated, hard) bands of active galactic nuclei are produced, and the Granger lags are estimated and co…
Capturing the lowest luminosity state of the supergiant fast X-ray transient XTE J1739−302
Ponti, G.; Sidoli, L.; Esposito, P. +1 more
Here, we report the results of our analysis of recent Chandra, XMM-Newton, and NuSTAR observations of the supergiant fast X-ray transient XTE J1739−302. The source was caught in a low X-ray luminosity state, from a few 1031-1034 erg s−1 (0.5-10 keV). A very low X-ray luminosity was captured during an XMM-Newton obs…
Modeling the Mg I from the NUV to MIR. II. Testing stellar models
Peralta, J. I.; Vieytes, M. C.; Mendez, A. M. P. +1 more
Context. Reliable atomic data are mandatory ingredients to obtain a realistic semiempirical model of any stellar atmosphere. Due to their importance, we further improved our recently published Mg I atomic model.
Aims: We tested the new atomic model using atmospheric models of stars of different spectral types: the Sun (dG2), HD 22049 (dK2, Ep…
A Low-mass, Pre-main-sequence Eclipsing Binary in the 40 Myr Columba Association-Fundamental Stellar Parameters and Modeling the Effect of Star Spots
Vanderburg, Andrew; Law, Nicholas M.; Ziegler, Carl +12 more
Young eclipsing binaries (EBs) are powerful probes of early stellar evolution. Current models are unable to simultaneously reproduce the measured and derived properties that are accessible for EB systems (e.g., mass, radius, temperature, and luminosity). In this study we add a benchmark EB to the pre-main-sequence population with our characterizat…
Time-dependent boundary conditions for data-driven coronal global and spherical wedge-shaped models
Feng, Xueshang; Jiang, Chaowei; Xiang, Changqing +1 more
The development of an efficient and accurate method for boundary condition treatments is of fundamental importance to data-driven magnetohydrodynamic (MHD) modelling of the global solar corona and solar active region. Particularly, in a 3D spherical wedge-shaped volume, suitable to the numerical study of solar active region, the transverse terms c…
Thermal Tides on Mars Before and During the 2018 Global Dust Event as Observed by TIRVIM-ACS Onboard ExoMars Trace Gas Orbiter
Grigoriev, A.; Forget, F.; Montmessin, F. +8 more
Migrating tides dominate the tropical climate on Mars and are known to reach high amplitudes during global dust events (GDE). In this study, we characterize the amplitude, phase and vertical wavelength of the diurnal and semidiurnal migrating tides in Mars' lower atmosphere (up to 50 km) by exploiting temperature vertical profiles retrieved from T…
Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point
Schmieder, Brigitte; Ding, Mingde; Zhu, Jiahao +1 more
Coronal jets are eruptions identified by a collimated, sometimes twisted spire. They are small-scale energetic events compared with flares. Using multiwavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly and a magnetogram from Hinode/Spectro-Polarimeter (Hinode/SP), we study the formation and evolution of a jet …
High-energy gamma-ray emission powered by a young protostar: the case of S255 NIRS 3
Su, Yang; de Oña Wilhelmi, Emma; López-Coto, Rubén
Evidence of efficient acceleration of cosmic rays in massive young stellar objects has been recently reported. Among these massive protostars, S255 NIRS 3, for which extreme flaring events associated with radio jets have been detected, is one of the best objects to test this hypothesis. We search for gamma-ray emission associated with this object …
Long-term optical variability of the Be/X-ray binary GRO J2058+42
Blinov, D.; Reig, P.; Tzouvanou, A. +1 more
Context. GRO J2058+42 is a transient hard X-ray pulsar that occasionally goes into outburst. The optical counterpart is a poorly studied OB-type companion.
Aims: We investigate the long-term optical variability of the Be/X-ray binary GRO J2058+42 and the possible connection with periods of enhanced X-ray activity.
Methods: We performed a…