Search Publications
Tilted discs in six poorly studied cataclysmic variables
Stefanov, Stefan Y.; Stefanov, Atanas K.
In this work, we search for negative superhumps (nSHs) in poorly studied cataclysmic variables using Transiting Exoplanet Survey Satellite data. We find three eclipsing binaries with nSH signatures: HBHA 4204-09, Gaia DR3 5931071148325476992, and SDSS J090113.51+144704.6. The last one exhibits IW And-like behaviour in archival Zwicky Transient Fac…
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…
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…
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…
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…
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…
The evolution of HCO+ in molecular clouds using a novel chemical post-processing algorithm
Bigiel, F.; Barnes, A. T.; Walch, S. +4 more
Modelling the chemistry of molecular clouds is critical to accurately simulating their evolution. To reduce computational cost, 3D simulations generally restrict their chemistry to species with strong heating and cooling effects. Time-dependent information about the evolution of other species is therefore often neglected. We address this gap by po…
A dense mini-Neptune orbiting the bright young star HD 18599
Kane, Stephen R.; Wittenmyer, Robert A.; Horner, Jonathan +24 more
Very little is known about the young planet population because the detection of small planets orbiting young stars is obscured by the effects of stellar activity and fast rotation, which mask planets within radial velocity and transit data sets. The few planets that have been discovered in young clusters generally orbit stars too faint for any det…