Search Publications
Tidal star-planet interaction and its observed impact on stellar activity in planet-hosting wide binary systems
Poppenhaeger, K.; Ilic, N.; Hosseini, S. Marzieh
Tidal interaction between an exoplanet and its host star is a possible pathway to transfer angular momentum between the planetary orbit and the stellar spin. In cases where the planetary orbital period is shorter than the stellar rotation period, this may lead to angular momentum being transferred into the star's rotation, possibly counteracting t…
Investigating Galactic binary cluster candidates with Gaia EDR3
Corradi, W. J. B.; Santos, J. F. C.; Maia, F. F. S. +1 more
A number of stellar open cluster (OC) pairs in the Milky Way occupy similar positions in the phase space (coordinates, parallax, and proper motions) and therefore may constitute physically interacting systems. The characterization of such objects based on observational data is a fundamental step towards a proper understanding of their physical sta…
Activity cycles in RS CVn-type stars
Martínez, C. I.; Buccino, A. P.; Mauas, P. J. D.
We compile a list of 120 RS CVn-type stars from the bibliography in Southern hemisphere, to search for rotation periods and activity cycles, covering a large range of luminosities and effective temperatures for late stars. For each system of the list, we use photometric data from the All Sky Automated Survey (ASAS), and complement it with our own …
Stellar multiplicity affects the correlation between protoplanetary disc masses and accretion rates: binaries explain high accretors in Upper Sco
Manara, Carlo F.; Zagaria, Francesco; Rosotti, Giovanni P. +1 more
In recent years, a correlation between mass accretion rates onto new-born stars and their protoplanetary disc masses was detected in nearby young star-forming regions. Although such a correlation can be interpreted as due to viscous-diffusion processes in the disc, highly accreting sources with low disc masses in more evolved regions remain puzzli…
The Magellanic Edges Survey - III. Kinematics of the disturbed LMC outskirts
Da Costa, G. S.; Belokurov, V.; Koposov, S. E. +3 more
We explore the structural and kinematic properties of the outskirts of the Large Magellanic Cloud (LMC) using data from the Magellanic Edges Survey (MagES) and Gaia EDR3. Even at large galactocentric radii (8° < R < 11°), we find the north-eastern LMC disc is relatively unperturbed: its kinematics are consistent with a disc of inclination ~3…
Velocity dispersions of clusters in the Dark Energy Survey Y3 redMaPPer catalogue
Smith, M.; Lidman, C.; Davis, T. M. +97 more
We measure the velocity dispersions of clusters of galaxies selected by the red-sequence Matched-filter Probabilistic Percolation (redMaPPer) algorithm in the first three years of data from the Dark Energy Survey (DES), allowing us to probe cluster selection and richness estimation, λ, in light of cluster dynamics. Our sample consists of 126 clust…
Binary parameters from astrometric and spectroscopic errors - candidate hierarchical triples and massive dark companions in Gaia DR3
Belokurov, Vasily; Evans, N. Wyn; Andrew, Shion +2 more
We show how astrometric and spectroscopic errors introduced by an unresolved binary system can be combined to give estimates of the binary period and mass ratio. This can be performed analytically if we assume we see one or more full orbits over our observational baseline, or numerically for all other cases. We apply this method to Gaia DR3 data, …
A search for stellar structures around nine outer halo globular clusters in the Milky Way
Mackey, Dougal; Da Costa, Gary S.; Zhang, Shumeng
We use deep imaging from the Dark Energy Camera to explore the peripheral regions of nine globular clusters in the outer halo of the Milky Way. Apart from Whiting 1 and NGC 7492, which are projected against the Sagittarius stream, we see no evidence for adjacent stellar populations to indicate any of these clusters is associated with coherent tida…
Scaling relations for globular cluster systems in early-type galaxies - II. Is there an environmental dependence?
Bassino, Lilia P.; Caso, Juan P.; Ennis, Ana I. +1 more
The current properties of globular cluster systems (GCSs) are the result of the evolution experienced by their host galaxies, which shape the richness of the GCS as well as its spatial distribution, among other features. We carry out an analysis of the projected radial distribution of globular clusters for a sample of almost 30 early-type galaxies…
White dwarfs identified in LAMOST Data Release 5
Liu, Jifeng; Bai, Yu; Zhang, Huawei +5 more
In this paper, we report white dwarfs (WD) identified in the 5th Data Release of the Large Area Multi-Object fibre Spectroscopic Telescope (LAMOST), including spectral types of DA, DB, DC, DZ, and so on. There are 2625 DA spectra of 2281 DA stars, 182 DB spectra of 166 DB stars, 62 DC spectra of 58 DC stars, 36 DZ spectra of 33 DZ stars…