Search Publications
Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars
Van Winckel, Hans; Nelemans, Gijs; Pols, Onno +1 more
Many disc-type post-asymptotic giant branch (post-AGB) stars are chemically peculiar, showing underabundances of refractory elements in their photospheres that correlate with condensation temperature. The aim of this paper is to investigate how accretion from a circumbinary disc can cause this phenomenon of depletion and how this impacts the evolu…
Extended stellar systems in the solar neighborhood. III. Like ships in the night: the Coma Berenices neighbor moving group
Meingast, Stefan; Alves, João; Fürnkranz, Verena
We report the discovery of a kinematically cold group of stars, located in the immediate neighborhood of the well-known star cluster Coma Berenices (Mel 111). The new group identified in tangential velocity space as measured by Gaia contains at least 177 coeval members distributed in two subgroups, and appears as a flattened structure parallel to …
The transitional gap transient AT 2018hso: new insights into the luminous red nova phenomenon
Gromadzki, M.; Mason, E.; Cappellaro, E. +20 more
Context. The absolute magnitudes of luminous red novae (LRNe) are intermediate between those of novae and supernovae (SNe), and show a relatively homogeneous spectro-photometric evolution. Although they were thought to derive from core instabilities in single stars, there is growing support for the idea that they are triggered by binary interactio…
Hot, rocky and warm, puffy super-Earths orbiting TOI-402 (HD 15337)
Latham, David W.; Ricker, George R.; Seager, Sara +30 more
Context. The Transiting Exoplanet Survey Satellite (TESS) is revolutionising the search for planets orbiting bright and nearby stars. In sectors 3 and 4, TESS observed TOI-402 (TIC-120896927), a bright V = 9.1 K1 dwarf also known as HD 15337, and found two transiting signals with periods of 4.76 and 17.18 days and radii of 1.90 and 2.21 R⊕
TESS first look at evolved compact pulsators. Asteroseismology of the pulsating helium-atmosphere white dwarf TIC 257459955
Córsico, Alejandro H.; Hermes, J. J.; Bell, Keaton J. +10 more
Context. Pulsation frequencies reveal the interior structures of white dwarf stars, shedding light on the properties of these compact objects that represent the final evolutionary stage of most stars. Two-minute cadence photometry from the Transiting Exoplanet Survey Satellite (TESS) records pulsation signatures from bright white dwarfs over the e…
CO, H2O, H2O+ line and dust emission in a z = 3.63 strongly lensed starburst merger at sub-kiloparsec scales
Smail, I.; Pérez-Fournon, I.; Ivison, R. J. +22 more
Using the Atacama Large Millimeter/submillimeter Array (ALMA), we report high angular-resolution observations of the redshift z = 3.63 galaxy H-ATLAS J083051.0+013224 (G09v1.97), one of the most luminous strongly lensed galaxies discovered by the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS). We present 0.″2-0.″4 resolution images o…
Constraining nuclear star cluster formation using MUSE-AO observations of the early-type galaxy FCC 47
Coccato, Lodovico; Fahrion, Katja; Leaman, Ryan +12 more
Context. Nuclear star clusters (NSCs) are found in at least 70% of all galaxies, but their formation path is still unclear. In the most common scenarios, NSCs form in-situ from the galaxy's central gas reservoir, through the merging of globular clusters (GCs), or through a combination of both.
Aims: As the scenarios pose different expectation…
Catalog of quasars from the Kilo-Degree Survey Data Release 3
Brescia, M.; Napolitano, N. R.; Maddox, N. +5 more
We present a catalog of quasars selected from broad-band photometric ugri data of the Kilo-Degree Survey Data Release 3 (KiDS DR3). The QSOs are identified by the random forest (RF) supervised machine learning model, trained on Sloan Digital Sky Survey (SDSS) DR14 spectroscopic data. We first cleaned the input KiDS data of entries with excessively…
Faint end of the z ∼ 3-7 luminosity function of Lyman-alpha emitters behind lensing clusters observed with MUSE
Laporte, N.; Bauer, F. E.; Bina, D. +21 more
Contact. This paper presents the results obtained with the Multi-Unit Spectroscopic Explorer (MUSE) at the ESO Very Large Telescope on the faint end of the Lyman-alpha luminosity function (LF) based on deep observations of four lensing clusters. The goal of our project is to set strong constraints on the relative contribution of the Lyman-alpha em…
Multiple stellar populations in NGC 1866. New clues from Cepheids and colour-magnitude diagram
Girardi, Léo; Marigo, Paola; Goudfrooij, Paul +5 more
We performed a comprehensive study of the stellar populations in the young Large Magellanic Cloud cluster NGC 1866, combining the analysis of its best-studied Cepheids with that of a very accurate colour-magnitude diagram (CMD) obtained from the most recent Hubble Space Telescope photometry. We used a Bayesian method based on new PARSEC stellar ev…