Search Publications
Global-MHD Simulations Using MagPIE: Impact of Flux Transfer Events on the Ionosphere
Strugarek, Antoine; Vaidya, Bhargav; Paul, Arghyadeep
This study presents a recently developed two-way coupled magnetosphere-ionosphere model named "MagPIE" that enables the investigation of the impact of flux transfer events (FTEs) on the ionosphere. Our findings highlight the prominent role of cusp-FTE reconnection in influencing the ionosphere. The typical morphology of an FTE signal, represented …
Chromatic Afterglow of GRB 200829A
Minaev, P. Yu.; Pozanenko, A. S.; Volnova, A. A. +16 more
We present the results of our analysis of multiwavelength observations for the long gamma-ray burst GRB 200829A. The burst redshift $z≈ 1.29± 0.04$ has been determined photometrically at the afterglow phase. In gamma rays the event is one of the brightest (in isotropic equivalent), $E_{\textrm{iso}}\gtrsim 10^{54}$ erg. The multicolor light curve …
Earth-based Stellar Occultation Predictions for Jupiter, Saturn, Uranus, Neptune, Titan, and Triton: 2023–2050
French, Richard G.; Souami, Damya
In support of studies of decadal-timescale evolution of outer solar system atmospheres and ring systems, we present detailed Earth-based stellar occultation predictions for Jupiter, Saturn, Uranus, Neptune, Titan, and Triton for 2023–2050, based on the Gaia Data Release 3 star catalog and near-IR K-band photometry from the Two Micron All Sky Surve…
Local bow shock environment during magnetosheath jet formation: results from a hybrid-Vlasov simulation
Pfau-Kempf, Yann; Ganse, Urs; Battarbee, Markus +11 more
Magnetosheath jets are plasma structures that are characterised by enhanced dynamic pressure and/or plasma velocity. In this study, we investigate the formation of magnetosheath jets in four two-dimensional simulation runs of the global magnetospheric hybrid-Vlasov model Vlasiator. We focus on jets whose origins were not clearly determined in a pr…
The broadening of the main sequence in the open cluster M38
Salaris, M.; Bedin, L. R.; Cassisi, S. +1 more
Our recent multiband photometric study of the colour width of the lower main sequence of the open cluster M37 has revealed the presence of a sizeable initial chemical composition spread in the cluster. If initial chemical composition spreads are common amongst open clusters, this would have major implications for cluster formation models and the f…
Magnetic topologies of two weak-line T Tauri stars TAP 4 and TAP 40
Donati, J. -F.; Collier Cameron, A.; Hussain, G. A. J. +3 more
We present a Zeeman-Doppler imaging study of two weak-line T Tauri stars TAP 4 and TAP 40, based on the high-resolution spectropolarimetric observations with ESPaDOnS at the Canada-France-Hawaii Telescope in November 2013, in the framework of the Magnetic Topologies of Young Stars and Survival of close-in giant Exoplanets large programme. We apply…
Spectral study of the Galactic ridge X-ray emission with Suzaku: Comparison of the spectral shape with point sources
Nobukawa, Masayoshi; Uchiyama, Hideki; Nobukawa, Kumiko K. +2 more
The Galactic ridge X-ray emission (GRXE) is unresolved X-ray emission located on the Galactic plane, and whether the GRXE comes from truly diffuse plasma or unresolved point sources is still debatable. We present results of spectral analysis of the GRXE with Suzaku. In order to examine the point source origin, we fitted the GRXE spectra in the 1.2…
Testing quasi-linear modified Newtonian dynamics theory with Galactic globular clusters in a weak external field
Calura, F.; Baumgardt, H.; Sollima, A. +2 more
We developed self-consistent dynamical models of stellar systems in the framework of quasi-linear modified Newtonian dynamics (QUMOND). The models are constructed from the anisotropic distribution function of Gunn and Griffin, combined with the modified Poisson equation defining this gravitation theory and take into account the external field effe…
ALMA Millimeter/Submillimeter Sources among Spitzer SMUVS Galaxies at z > 2 in the COSMOS Field
Caputi, Karina I.; Suzuki, Tomoko L.; van Mierlo, Sophie E.
Submillimeter observations reveal the star formation activity obscured by dust in the young Universe. It still remains unclear how galaxies detected at submillimeter wavelengths are related to ultraviolet/optical-selected galaxies in terms of their observed quantities, physical properties, and evolutionary stages. Deep near- and mid-infrared obser…
A multiyear photopolarimetric study of the semi-regular variable V CVn and identification of analog sources
Ignace, R.; Simpson, J.; Shrestha, M. +4 more
The semi-regular variable star V Canum Venaticorum (V CVn) is well known for its unusual linear polarization position angle (PA). Decades of observing V CVn reveal a nearly constant PA spanning hundreds of pulsation cycles. This phenomenon has persisted through variability that has varied by two magnitudes in optical brightness and through variabi…