Search Publications
TESS search for substellar companions through pulsation timing of δ Scuti stars. I. Discovery of companions around Chang 134 and V393 Car
Piotto, G.; Nascimbeni, V.; Vaulato, V.
Early-type main-sequence pulsating stars such as δ Scuti variables are one of the least explored class of targets in the search for exoplanets. Pulsation timing (PT) is an alternative technique to the most effective search methods. It exploits the light-travel-time effect (LTTE) to infer the presence of additional massive bodies around a pulsating…
Identification of new M 31 star cluster candidates from PAndAS images using convolutional neural networks
Liu, Wei; Chen, Bingqiu; Ma, Jun +7 more
Context. Identification of new star cluster candidates in M 31 is fundamental for the study of the M 31 stellar cluster system. The machine-learning method convolutional neural network (CNN) is an efficient algorithm for searching for new M 31 star cluster candidates from tens of millions of images from wide-field photometric surveys.
Aims: W…
eROSITA study of the globular cluster 47 Tucanae
Sasaki, Manami; Bulbul, Esra; Becker, Werner +7 more
Aims: We present the results of the analysis of five observations of the globular clutser 47 Tucanae (47 Tuc) with the extended Roentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spektrum-Roentgen-Gamma (Spektr-RG, SRG). We study the X-ray population in the field of one of the most massive globular clusters in our Milky Wa…
A potential new phase of massive star formation. A luminous outflow cavity centred on an infrared quiet core
Schneider, N.; Bontemps, S.; Peretto, N. +4 more
Context. Due to the sparsity and rapid evolution of high-mass stars, a detailed picture of the evolutionary sequence of massive protostellar objects still remains to be drawn. Some of the early phases of their formation are so short that only a select number of objects throughout the Milky Way currently find themselves spending time in those phase…
Probing the megaparsec-scale environment of hyperluminous infrared galaxies at 2 < z < 4
Wang, L.; Farrah, D.; Clements, D. +3 more
Context. Protoclusters are progenitors of galaxy clusters and they serve as an important key in studies of how halo mass and stellar mass assemble in the early universe. Finding the signposts of such overdense regions, such as bright dusty star-forming galaxies (DSFG), is a popular method for identifying protocluster candidates.
Aims: Hyperlu…
GRB 190919B: Rapid optical rise explained as a flaring activity
Karpov, Sergey; Hu, Y. -D.; Castro-Tirado, Alberto J. +17 more
Following the detection of a long GRB 190919B by INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory), we obtained an optical photometric sequence of its optical counterpart. The light curve of the optical emission exhibits an unusually steep rise ∼100 s after the initial trigger. This behaviour is not expected from a `canonical' GRB optical…
Probing the innermost region of the AU Microscopii debris disc
Milli, J.; Boccaletti, A.; Girard, J. H. +5 more
Context. AU Mic is a young and nearby M-dwarf star harbouring a circumstellar debris disc and one recently discovered planet on an eight-day orbit. Large-scale structures within the disc were also discovered and are moving outwards at high velocity.
Aims: We aim to study this system with the highest spatial resolution in order to probe the in…
Probing the shape of the Milky Way dark matter halo with hypervelocity stars: A new method
Gallo, Arianna; Ostorero, Luisa; Chakrabarty, Sankha Subhra +2 more
We propose a new method for determining the shape of the gravitational potential of the dark matter (DM) halo of the Milky Way (MW) with the galactocentric tangential velocities of a sample of hypervelocity stars (HVSs). We compute the trajectories of different samples of HVSs in a MW where the baryon distribution is axisymmetric and the DM potent…
Catalogue of stars measured in the Geneva seven-colour photometric system
Paunzen, E.
Context. The Geneva seven-colour photometric system is successfully applied to the study of various astrophysical objects. It measures the slope of the Paschen continuum, the Balmer discontinuity, and blocking absorption due to hydrogen or metallic lines. One of its greatest strengths is its intrinsic homogeneity.
Aims: A new catalogue of the…
Dust emissivity in resolved spiral galaxies
Clark, Christopher J. R.; De Looze, Ilse; Baes, Maarten +12 more
Context. The far-infrared (FIR) and sub-millimeter (submm) emissivity, ϵν, of the Milky Way (MW) cirrus is an important benchmark for dust grain models. Dust masses in other galaxies are generally derived from the FIR/submm using the emission properties of these MW-calibrated models.
Aims: We seek to derive the FIR/submm ϵν