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Confrontation between modelled solar integrated observables and direct observations. I. Radial velocities and convective blueshift
Meunier, N.; Lagrange, A. -M.; Dumusque, X. +1 more
Context. Stellar variability strongly impacts the search for low-mass exoplanets with radial velocity techniques. Two types of planet-free time series can be used to quantify this impact: models and direct solar observations after a subtraction of the Solar System planetary contribution. Making a comparison among these approaches is necessary to i…
A Detailed Study of Jupiter's Great Red Spot over a 90-day Oscillation Cycle
Wong, Michael H.; Irwin, Patrick G. J.; Simon, Amy A. +1 more
Jupiter's Great Red Spot (GRS) is known to exhibit oscillations in its westward drift with a 90-day period. The GRS was observed with the Hubble Space Telescope on eight dates over a single oscillation cycle in 2023 December to 2024 March to search for correlations in its physical characteristics over that time. Measured longitudinal positions are…
A Model for Flux Rope Formation and Disconnection in Pseudostreamer Coronal Mass Ejections
Lynch, B. J.; Antiochos, S. K.; Kumar, P. +3 more
Coronal mass ejections (CMEs) from pseudostreamers represent a significant fraction of large-scale eruptions from the Sun. In some cases, these CMEs take a narrow jet-like form reminiscent of coronal jets; in others, they have a much broader fan-shaped morphology like CMEs from helmet streamers. We present results from a magnetohydrodynamic simula…
Flaring Activity for Low-mass Stars in the β Pictoris Moving Group
Schlieder, Joshua E.; Komacek, Thaddeus D.; Ealy, Jordan N. +1 more
Stellar flares from K and M dwarfs release panchromatic radiation characterized by a significantly higher brightness temperature (∼9–20 kK) than the star. The increased frequency of magnetic activity on young low-mass stars results in the energy released during flaring events becoming a notable contributor to the radiation environment. This study …
Galaxy formation catalyzed by gravastars and the JWST, revisited
Adler, Stephen L.
We have proposed that galaxy formation is catalyzed by the collision of infalling and outstreaming particles from leaky, horizonless astrophysical black holes, most likely gravastars, and based on this gave a model for the disk galaxy scale length. In this paper we modify our original scale length formula by including an activation probability
SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
Irtuganov, E. N.; Kolbin, A. I.; Karpova, A. V. +19 more
We have carried out multiwavelength spectroscopic and photometric studies of the object SRGe J194401.8+284452 (2RXS J194401.4+284456, XMMSL2 J194402.0+284451, 2SXPS J194401.7+284450), the brightest X-ray source in the position uncertainty ellipse of the unidentified gamma-ray source 4FGL J1943.9+2841, with the goal of determining its nature and th…
Highly collisional regions determined by interplanetary magnetic field structures
Lai, H. R.; Russell, C. T.; Jia, Y. D. +3 more
Submicron debris released in interplanetary collisions gets charged in the solar wind and generates disturbances to the magnetic field environment. The unique magnetic field disturbances, named interplanetary field enhancements (IFEs) are recorded by many spacecraft. In this study, we have developed a novel model to trace the IFEs to their origins…
Population of giant planets around B stars from the first part of the BEAST survey
Helled, R.; Henning, Th.; Mayer, L. +23 more
Context. Exoplanets form from circumstellar protoplanetary disks whose fundamental properties (notably their extent, composition, mass, temperature, and lifetime) depend on the host star properties, such as their mass and luminosity. B stars are among the most massive stars and their protoplanetary disks test extreme conditions for exoplanet forma…
Tilt-to-length coupling in LISA Pathfinder: Long-term stability
Mendes, L.; Russano, G.; Sanjuan, J. +75 more
The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular time spans. In this work, we investigate the long-term stability of the coupling coefficients of this noise. We show that they drifted slowly (by
Chandra Survey in the AKARI deep field at the North Ecliptic Pole: Optical and near-infrared identifications of X-ray sources
Malkan, M. A.; Ohyama, Y.; Takagi, T. +17 more
Aims. We present a catalog of optical and infrared (NIR) identifications (ID) of X-ray sources in the AKARI North Ecliptic Pole (NEP) deep field detected with Chandra, covering ~0.34 deg2 and with 0.5–2 keV flux limits ranging between ~2–20 × 10‑16 erg s‑1 cm‑2. Methods. The optical/NIR counterparts of t…