Search Publications
Constraining stellar evolution theory with asteroseismology of γ Doradus stars using deep learning. Stellar masses, ages, and core-boundary mixing
Aerts, C.; Van Reeth, T.; Mombarg, J. S. G.
Context. The efficiency of the transport of angular momentum and chemical elements inside intermediate-mass stars lacks proper calibration, thereby introducing uncertainties on a star's evolutionary pathway. Improvements require better estimation of stellar masses, evolutionary stages, and internal mixing properties.
Aims: Our aim was to deve…
1D atmospheric study of the temperate sub-Neptune K2-18b
Bézard, B.; Charnay, B.; Blain, D.
Context. The atmospheric composition of exoplanets with masses between 2 and 10 M⊕ is poorly understood. In that regard, the sub-Neptune K2-18b, which is subject to Earth-like stellar irradiation, offers a valuable opportunity for the characterisation of such atmospheres. Previous analyses of its transmission spectrum from the Kepler, H…
The all-sky PLATO input catalogue
Heras, A. M.; Deleuil, M.; Rauer, H. +29 more
Context. The ESA PLAnetary Transits and Oscillations of stars (PLATO) mission will search for terrestrial planets in the habitable zone of solar-type stars. Because of telemetry limitations, PLATO targets need to be pre-selected.
Aims: In this paper, we present an all sky catalogue that will be fundamental to selecting the best PLATO fields a…
pyUPMASK: an improved unsupervised clustering algorithm
Moitinho, A.; Perren, G. I.; Pera, M. S. +2 more
Aims: We present pyUPMASK, an unsupervised clustering method for stellar clusters that builds upon the original UPMASK package. The general approach of this method makes it plausible to be applied to analyses that deal with binary classes of any kind as long as the fundamental hypotheses are met. The code is written entirely in Python and is …
Local spiral structure based on the Gaia EDR3 parallaxes
Hao, C. J.; Xu, Y.; Hou, L. G. +4 more
Context. The astrometric satellite Gaia is expected to significantly increase our knowledge as to the properties of the Milky Way. The Gaia Early Data Release 3 (EDR3) provides the most precise parallaxes for many OB stars, which can be used to delineate the Galactic spiral structure.
Aims: We investigate the local spiral structure with the l…
Evolution of the local spiral structure of the Milky Way revealed by open clusters
Hao, C. J.; Xu, Y.; Hou, L. G. +6 more
The structure and evolution of the spiral arms of our Milky Way are basic but long-standing questions in astronomy. In particular, the lifetime of spiral arms is still a puzzle and has not been well constrained from observations. In this work, we aim to inspect these issues using a large catalogue of open clusters. We compiled a catalogue of 3794 …
The luminous red nova AT 2018bwo in NGC 45 and its binary yellow supergiant progenitor
Gehrz, Robert D.; Bond, Howard E.; Burdge, Kevin B. +12 more
Luminous red novae (LRNe) are astrophysical transients associated with the partial ejection of a binary system's common envelope shortly before its merger. Here we present the results of our photometric and spectroscopic follow-up campaign of AT 2018bwo (DLT 18x), a LRN discovered in NGC 45, and investigate its progenitor system using binary stell…
3D dynamics of the Orion cloud complex. Discovery of coherent radial gas motions at the 100-pc scale
Meingast, Stefan; Alves, João; Großschedl, Josefa E. +1 more
We present the first study of the three-dimensional (3D) dynamics of the gas in the entire southern Orion cloud complex. We used the parallaxes and proper motions of young stellar objects (YSOs) from Gaia DR2 as a proxy for gas distance and proper motion, and the gas radial velocities from archival CO data, to compute the space motions of the diff…
Size and structures of disks around very low mass stars in the Taurus star-forming region
Pascucci, I.; Testi, L.; Scholz, A. +7 more
Context. The discovery of giant planets orbiting very low mass stars (VLMS) and the recent observed substructures in disks around VLMS is challenging planet formation models. Specifically, radial drift of dust particles is a catastrophic barrier in these disks, which prevents the formation of planetesimals and therefore planets.
Aims: We aim …
Low-redshift compact star-forming galaxies as analogues of high-redshift star-forming galaxies
Schaerer, D.; Thuan, T. X.; Izotov, Y. I. +3 more
We compare the relations among various integrated characteristics of ∼25 000 low-redshift (z ≲ 1.0) compact star-forming galaxies (CSFGs) from Data Release 16 (DR16) of the Sloan Digital Sky Survey and of high-redshift (z ≳ 1.5) star-forming galaxies (SFGs) with respect to oxygen abundances, stellar masses M⋆, far-UV absolute magnitudes…