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SWEET-Cat: A view on the planetary mass-radius relation
Adibekyan, V.; Hoyer, S.; Sousa, S. G. +9 more
Aims. SWEET-Cat (Stars With ExoplanETs Catalog) was originally introduced in 2013, and since then, the number of confirmed exoplanets has increased significantly. A crucial step for a comprehensive understanding of these new worlds is the precise and homogeneous characterization of their host stars. Methods. We used a large number of high-resoluti…
Icarus Revisited: An Ancient, Metal-poor Accreted Stellar Stream in the Disk of the Milky Way
Vitali, Sara; Cignoni, Michele; Lattanzi, Mario G. +2 more
The search for accreted satellites in the Galactic disk is a challenging task, to which Gaia plays a crucial role in synergy with ground-based spectroscopic surveys. In 2021, P. Re Fiorentin et al. discovered five substructures with disk kinematics including Icarus. To gain more insight into the origin of Icarus as a remnant of a dwarf galaxy rath…
The restless population of bright X-ray sources of NGC 3621
Salvaterra, R.; Tiengo, A.; Marelli, M. +9 more
We report on the multi-year evolution of the population of X-ray sources in the nuclear region of NGC 3621 based on Chandra, XMM-Newton, and Swift observations. Among these, two sources, X1 and X5, after their first detection in 2008, seem to have faded below the detectability threshold, a most interesting fact as X1 is associated with the active …
COSMOS brightest group galaxies: III. Evolution of stellar ages
Finoguenov, A.; Ilbert, O.; Magdis, G. E. +15 more
The unique characteristics of the brightest group galaxies (BGGs) serve as a link in the evolutionary continuum between galaxies such as the Milky Way and the more massive brightest cluster galaxies found in dense clusters. This research investigates the evolution of the stellar properties of BGGs over cosmic time (z = 0.08 ‑ 1.30), extending the …
Multipoint observations of compressional Pc5-6 pulsations in the dawn side magnetosphere: A case study
Sibeck, D. G.; Korotova, G. I.
We present a case study of compressional Pc5-6 pulsations observed by THEMIS-D and -E in the dawn sector of the magnetosphere following 1100 UT on January 22, 2010. The pulsations were observed during a moderate substorm triggered by the IMF discontinuity and an accompanying change in the solar wind dynamic pressure at 1045 UT. The event can be co…
Testing the flux tube expansion factor - solar wind speed relation with Solar Orbiter data
Maksimovic, M.; Louarn, P.; Démoulin, P. +5 more
Context. The properties of the solar wind measured in situ in the heliosphere are largely controlled by energy deposition in the solar corona, which is in turn closely related to the properties of the coronal magnetic field. Previous studies have shown that long-duration and large-scale magnetic structures show an inverse relation between the sola…
Radial Metallicity Gradients for the Chemically Selected Galactic Thin Disc Main-Sequence Stars
Seabroke, G. M.; Bilir, S.; Ak, T. +3 more
We present the radial metallicity gradients within the Galactic thin disc population through main-sequence stars selected on the chemical plane using GALAH DR3 accompanied with Gaia DR3 astrometric data. The [Fe/H], [α/Fe] and [Mg/H] radial gradients are estimated for guiding radius as -0.074±0.006, +0.004±0.002, -0.074±0.006 dex kpc -1…
Discovery of Two Different Full Disk Evolutionary Patterns of M-type T Tauri Stars with LAMOST DR8
Zhao, Yongheng; Duan, Fuqing; Li, Guang-Wei +2 more
The full disk, full of gas and dust, determines the upper limit of planet masses, and its lifetime is critical for planet formation, especially for giant planets. In this work, we studied the evolutionary timescales of the full disks of T Tauri stars (TTSs) and their relations to accretion. Combined with Gaia EDR3, Two Micron All Sky Survey, and W…
PeVatron candidate SNR G106.3+2.7 in a low-density cavity: a multiwavelength test
Liu, Ruo-Yu; Chen, Yang; Ge, Chong +1 more
In this paper, we constrain the density of the interstellar medium (ISM) around the hadronic PeVatron candidate, supernova remnant (SNR) G106.3+2.7, based on X-ray and γ-ray observations. The purpose of this investigation is to understand the influence of the gaseous environment on this SNR as a proton PeVatron candidate. By modelling the self-reg…
Telescope control software and proto-model siderostat for the SDSS-V Local Volume Mapper
Kollmeier, Juna A.; Drory, Niv; Froning, Cynthia S. +19 more
The fifth Sloan Digital Sky Survey Local Volume Mapper (LVM) is a wide-field integral field unit survey that uses an array of four 160 mm fixed telescopes with siderostats to minimize the number of moving parts. An individual telescope observes the science or calibration field independently and is synchronized with the science exposure. We develop…