Search Publications
Non-LTE abundance analysis of A-B stars with low rotational velocities - II. Do A-B stars with normal abundances exist?
Sitnova, T. M.; Korotin, S. A.; Romanovskaya, A. M. +2 more
We present chemical composition and fundamental parameters (the effective temperature, surface gravity, and radius) for four sharp-lined A-type stars γ Gem (HD 41705), o Peg (HD 214994), θ Vir (HD 114330), and ν Cap (HD 193432). Our analysis is based on a self-consistent model fitting of high-resolution spectra and spectrophotometric observations …
Three-dimensional dust stirring by a giant planet embedded in a protoplanetary disc
Birnstiel, Til; Szulágyi, Judit; Binkert, Fabian
The motion of solid particles embedded in gaseous protoplanetary discs is influenced by turbulent fluctuations. Consequently, the dynamics of moderately to weakly coupled solids can be distinctly different from the dynamics of the gas. Additionally, gravitational perturbations from an embedded planet can further impact the dynamics of solids. In t…
Stellar spectral-type (mass) dependence of the dearth of close-in planets around fast-rotating stars. Architecture of Kepler confirmed single-exoplanet systems compared to star-planet evolution models
García, R. A.; Mathis, S.; Mathur, S. +8 more
In 2013 a dearth of close-in planets around fast-rotating host stars was found using statistical tests on Kepler data. The addition of more Kepler and Transiting Exoplanet Survey Satellite (TESS) systems in 2022 filled this region of the diagram of stellar rotation period (Prot) versus the planet orbital period (Porb). We rev…
The Isotropic Center of NGC 5419-A Core in Formation?
Bender, Ralf; Thomas, Jens; Naab, Thorsten +5 more
With its cored surface brightness profile, the elliptical galaxy NGC 5419 appears as a typical high-mass early-type galaxy (ETG). However, the galaxy hosts two distinct nuclei in its center. We use high-signal MUSE (Multi-unit Spectroscopic Explorer (Based on observations collected at the European Organisation for Astronomical Research in the Sout…
Discovery and Timing of Millisecond Pulsars in the Globular Cluster M5 with FAST and Arecibo
Fu, Xiaoting; Tsai, Chao-Wei; Cadelano, Mario +29 more
We report on a comprehensive multiwavelength study of the pulsars in the globular cluster (GC) M5, including the discovery of M5G, a new compact noneclipsing "black widow" pulsar. Thanks to the analysis of 34 yr of radio data taken with the Five-hundred-meter Aperture Spherical radio Telescope and Arecibo telescopes, we obtained new phase-connecte…
The incidence of AGN in galaxies with different stellar population ages
Salvato, M.; Buchner, J.; Merloni, A. +4 more
It has been argued that recycled gas from stellar mass loss in galaxies might serve as an important fuelling source for black holes (BHs) in their centres. Utilizing spectroscopic samples of galaxies from the Sloan Digital Sky Survey (SDSS) at z = 0-0.35 and the Large Early Galaxy Astrophysics Census (LEGA-C) survey at z = 0.6-1 that have X-ray co…
Vertical wind structure in an X-ray binary revealed by a precessing accretion disk
Fabian, A. C.; Reynolds, C. S.; Pinto, C. +11 more
The accretion of matter onto black holes and neutron stars often leads to the launching of outflows that can greatly affect the environments surrounding the compact object. An important means of studying these winds is through X-ray absorption line spectroscopy, which allows us to probe their properties along a single sightline, but usually provid…
A quantitative description of comet 67P's dust and gas production remains enigmatic
Blum, J.; Gundlach, B.; Attree, N. +2 more
The mechanism of dust emission from a cometary nucleus is still an open question and thermophysical models have problems reproducing outgassing and dust productions rates simultaneously. In this study, we investigate the capabilities of a rather simple thermophysical model to match observations from Rosetta instruments at comet 67P/Churyumov-Geras…
Time Dependence of 50-250 MeV Galactic Cosmic-Ray Protons between Solar Cycles 24 and 25, Measured by the High-energy Particle Detector on board the CSES-01 Satellite
Vitale, V.; Ubertini, P.; Potgieter, M. S. +54 more
Time-dependent energy spectra of galactic cosmic rays (GCRs) carry crucial information regarding their origin and propagation throughout the interstellar environment. When observed at the Earth, after traversing the interplanetary medium, such spectra are heavily affected by the solar wind and the embedded solar magnetic field permeating the inner…
EDEN Survey: Small Transiting Planet Detection Limits and Constraints on the Occurrence Rates of Planets around Late-M Dwarfs within 15 pc
Henning, Thomas; Apai, Dániel; Lin, Chia-Lung +30 more
Earth-sized exoplanets that transit nearby, late-spectral-type red dwarfs will be prime targets for atmospheric characterization in the coming decade. Such systems, however, are difficult to find via widefield transit surveys like Kepler or TESS. Consequently, the presence of such transiting planets is unexplored and the occurrence rates of short-…