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Different Planetary Eccentricity-period (PEP) Distributions of Small and Giant Planets
Faigler, Simchon; Mazeh, Tsevi; Bashi, Dolev
We used the database of 1040 short-period (1 ≤ P < 200 days) exoplanets radial-velocity orbits to study the planetary eccentricity-period (PEP) distribution. We first divided the sample into low- and high-mass exoplanet subsamples based on the distribution of the (minimum) planetary masses, which displays a clear two-Gaussian distribution, sepa…
Mass determination of two Jupiter-sized planets orbiting slightly evolved stars: TOI-2420 b and TOI-2485 b
Trifonov, Trifon; Henning, Thomas; Hellier, Coel +68 more
Context. Hot and warm Jupiters might have undergone the same formation and evolution path, but the two populations exhibit different distributions of orbital parameters. This challenges our understanding of their actual origin. Aims. We report the results of our warm Jupiters survey, which was carried out with the CHIRON spectrograph within the KE…
A comparison of compact, presumably young with extended, evolved radio active galactic nuclei
Meusinger, Helmut; Mhaskey, Mukul
Context. The triggering and evolution of active galactic nuclei (AGNs) and the interaction of the AGN with its host galaxy is an important topic in extragalactic astrophysics. Radio sources with peaked spectra (peaked spectrum sources, PSS) and compact symmetric objects (CSO) are powerful, compact, and presumably young AGNs and therefore particula…
Dynamics and structure of network magnetic fields: supergranular vortex expansion-contraction
Chian, Abraham C. -L.; Rempel, Erico L.; Gošić, Milan +1 more
We report on the formation of a large magnetic coherent structure in a vortex expansion-contraction interval, resulting from the merger of two plasmoids driven by a supergranular vortex observed by Hinode in the quiet-Sun. Strong vortical flows at the interior of vortex boundary are detected by the localized regions of high values of the instantan…
Acceleration of an interplanetary shock through the magnetosheath: a global hybrid simulation
Modolo, R.; Fontaine, D.; Savoini, P. +1 more
According to most observations and simulations, interplanetary shocks slow down when they propagate through the magnetosheath. In this article, we present results from a self-consistent global hybrid PIC simulation of an interplanetary shock which, by contrast, accelerates as it propagates through the magnetosheath. In this simulation, the solar w…
Morphological and Structural Characterization of Shortening Landforms on Mars
Klimczak, Christian; McCullough, Leta R.; Crane, Kelsey T. +1 more
The lithosphere of Mars accommodates horizontal shortening through folding and faulting, producing landforms described as wrinkle ridges or lobate scarps. Despite this nomenclature, we lack a deep understanding of the drivers of morphological differences observed between landform types. This study aims to develop a quantitative model for shortenin…
On the Contribution of Latitude-Dependent ULF Waves to the Radial Transport of Off-Equatorial Relativistic Electrons in the Radiation Belts
Angelopoulos, Vassilis; Li, Xinlin; Ergun, Robert E. +15 more
Ultra-low frequency (ULF) waves radially diffuse hundreds-keV to few-MeV electrons in the magnetosphere, as the range of drift frequencies of such electrons overlaps with the wave frequencies, leading to resonant interactions. Theoretically this process is described by analytic expressions of the resonant interactions between electrons and ULF wav…
Beyond the rings: Polar ring galaxy NGC 4262 and its globular cluster system
Mathew, Blesson; Kartha, Sreeja S.; Akhil, Krishna R.
In the context of the hierarchical model of galaxy evolution, polar ring galaxies (PRGs) are considered the intermediate phase between ongoing mergers and quiescent galaxies. This study explores the globular cluster system (GCS) and its properties in the nearest PRG, NGC4262, serving as a pilot investigation to study GCS in nearby PRGs. We utilize…
Detailed mapping of the Galactic disc structure in the solar neighbourhood through LAMOST K dwarfs
Qiu, Dan; Tian, Hao; Liu, Chao +4 more
The Galactic disc is one of the main components of the Milky Way, which contributes most of the luminosity. Its structure is essential for understanding the formation and evolution of the Milky Way. Using 174 443 K-type dwarf stars observed by both Large Sky Area Multi-Object Fiber Spectroscopic Telescope and Gaia Data Release 3, we study the disc…
The factors that influence protostellar multiplicity: I. Gas temperature, density, and mass in Perseus with Nobeyama
Johnstone, D.; Hacar, A.; Sakai, N. +9 more
Context. Protostellar multiplicity is common at all stages and mass ranges. However, the factors that determine the multiplicity of protostellar systems have not been systematically characterized through their molecular gas. Aims. We characterize the physical properties of the Perseus molecular cloud at ≥5000 AU scales by mapping the diagnostic mo…