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Kinematic-chemical Analysis and Time Tagging for the Diagonal Ridge Structure of the Galactic Outer Disk with LAMOST Red-giant Branch Stars
Yang, Peng; Wang, Hai-Feng; Tepper-García, Thor +2 more
We investigate the kinematic-chemical distribution of red-giant branch stars from the LAMOST survey crossed matched with Gaia DR2 proper motions, and present time tagging for the well-known ridge structures (diagonal distributions for V R in the R, V ϕ plane) in the range of Galactocentric distance R = 8 to 15 kpc. We det…
Study of the excess Fe XXV line emission in the central degrees of the Galactic centre using XMM-Newton data
Campana, S.; Haberl, F.; Ponti, G. +14 more
The diffuse Fe XXV (6.7 keV) line emission observed in the Galactic ridge is widely accepted to be produced by a superposition of a large number of unresolved X-ray point sources. In the very central degrees of our Galaxy, however, the existence of an extremely hot (~7 keV) diffuse plasma is still under debate. In this work we measure the Fe XXV l…
V994 Herculis: a unique triply eclipsing sextuple star system
Munari, U.; Pál, A.; Vanderburg, A. +23 more
We report the discovery with the Transiting Exoplanet Survey Satellite (TESS) of a third set of eclipses from V994 Herculis (V994 Her, TIC 424508303), previously only known as a doubly eclipsing system. The key implication of this discovery and our analyses is that V994 Her is the second fully characterized (2+2) + 2 sextuple system, in which all …
A search for planetary transits on a set of 1.4 million multisector DIAmante light curves
Montalto, M.
I report the results of a new search for transiting planets on a set of 1.4 million light curves extracted from TESS Full Frame Images (FFIs) using the DIAmante pipeline. The data come from the first 2 yr of observations of TESS (Sectors 1-26) and the study is focused on a sample of FGKM dwarf and subgiant stars optimized for the search of transit…
Are "Changing-look" Active Galactic Nuclei Special in the Coevolution of Supermassive Black Holes and Their Hosts? I.
Filippenko, A. V.; Wang, J.; Gao, C. +5 more
The nature of the so-called "changing-look" (CL) active galactic nucleus (AGN), which is characterized by spectral-type transitions within ~10 yr, remains an open question. As the first in our series of studies, we attempt here to understand the CL phenomenon from the view of the coevolution of AGNs and their host galaxies (i.e., if CL-AGNs are at…
The kinematics, metallicities, and orbits of six recently discovered Galactic star clusters with Magellan/M2FS spectroscopy
Caldwell, Nelson; Belokurov, Vasily; Zucker, Daniel B. +9 more
We present Magellan/M2FS spectroscopy of four recently discovered Milky Way star clusters (Gran 3/Patchick 125, Gran 4, Garro 01, and LP 866) and two newly discovered open clusters (Gaia 9 and Gaia 10) at low Galactic latitudes. We measure line-of-sight velocities and stellar parameters ([Fe/H], log g, Teff, and [Mg/Fe]) from high-resol…
The molecular environment of the solar-type protostar IRAS 16293-2422
Wyrowski, Friedrich; Menten, Karl M.; Kahle, K. Angelique +1 more
Context. Studying the physical and chemical processes leading to the formation of low-mass stars is crucial for understanding the origin of our Sun and the Solar System. In particular, analyzing the emission and absorption lines from molecules to derive their spatial distribution in the envelopes of young stellar objects is a fundamental tool to o…
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…