Search Publications
Hubble Space Telescope survey of Magellanic Cloud star clusters. Photometry and astrometry of 113 clusters and early results
Di Criscienzo, M.; Wang, C.; Milone, A. P. +29 more
In the past few years, we have undertaken an extensive investigation of star clusters and their stellar populations in the Large and Small Magellanic Clouds (LMC and SMC) based on archival images collected with the Hubble Space Telescope. We present photometry and astrometry of stars in 101 fields observed with the Wide Field Channel of the Advanc…
Direct imaging discovery of a super-Jovian around the young Sun-like star AF Leporis
De Rosa, Robert J.; Nielsen, Eric L.; Hirsch, Lea A. +5 more
Context. Expanding the sample of directly imaged companions to nearby, young stars that are amenable to detailed astrometric and spectroscopic studies is critical for the continued development and validation of theories of their evolution and atmospheric processes.
Aims: The recent release of the Gaia astrometric catalog allows us to efficien…
The LOFAR Two-Metre Sky Survey. VI. Optical identifications for the second data release
Prandoni, I.; Shimwell, T. W.; Vaccari, M. +49 more
The second data release of the LOFAR Two-Metre Sky Survey (LoTSS) covers 27% of the northern sky, with a total area of ~5700 deg1. The high angular resolution of LOFAR with Dutch baselines (6 arcsec) allows us to carry out optical identifications of a large fraction of the detected radio sources without further radio followup; however, …
Gas phase Elemental abundances in Molecular cloudS (GEMS). VII. Sulfur elemental abundance
Bachiller, R.; Gerin, M.; Goicoechea, J. R. +18 more
Context. Gas phase Elemental abundances in molecular CloudS (GEMS) is an IRAM 30-m Large Program aimed at determining the elemental abundances of carbon (C), oxygen (O), nitrogen (N), and sulfur (S) in a selected set of prototypical star-forming filaments. In particular, the elemental abundance of S remains uncertain by several orders of magnitude…
An extremely metal-poor star complex in the reionization era: Approaching Population III stars with JWST
Dickinson, M.; Zanella, A.; Bradač, M. +32 more
We present JWST/Near Infrared Spectrograph (NIRSpec) integral field spectroscopy (IFS) of a lensed Population III candidate stellar complex (dubbed Lensed And Pristine 1, LAP1), with a lensing-corrected stellar mass of ≲104 M⊙ and an absolute luminosity of MUV > −11.2 (mUV > 35.6), confirmed at red…
MINDS. Abundant water and varying C/O across the disk of Sz 98 as seen by JWST/MIRI
Henning, Thomas; Östlin, Göran; Güdel, Manuel +41 more
Context. The Mid-InfraRed Instrument (MIRI) Medium Resolution Spectrometer (MRS) on board the James Webb Space Telescope (JWST) allows us to probe the inner regions of protoplanetary disks, where the elevated temperatures result in an active chemistry and where the gas composition may dictate the composition of planets forming in this region. The …
Gaia Data Release 3. Pulsations in main sequence OBAF-type stars
Prusti, T.; Mazeh, T.; Zucker, S. +445 more
Context. The third Gaia data release provides photometric time series covering 34 months for about 10 million stars. For many of those stars, a characterisation in Fourier space and their variability classification are also provided. This paper focuses on intermediate- to high-mass (IHM) main sequence pulsators (M ≥ 1.3 M⊙) of spectral …
Direct discovery of the inner exoplanet in the HD 206893 system. Evidence for deuterium burning in a planetary-mass companion
Lutz, D.; Genzel, R.; Sturm, E. +108 more
Aims: HD 206893 is a nearby debris disk star that hosts a previously identified brown dwarf companion with an orbital separation of ∼10 au. Long-term precise radial velocity (RV) monitoring, as well as anomalies in the system proper motion, has suggested the presence of an additional, inner companion in the system.
Methods: Using informa…
Tormund's return: Hints of quasi-periodic eruption features from a recent optical tidal disruption event
Miniutti, G.; Clerc, N.; Webb, N. A. +8 more
Context. Quasi-periodic eruptions (QPEs) are repeating thermal X-ray bursts associated with accreting massive black holes, the precise underlying physical mechanisms of which are still unclear.
Aims: We present a new candidate QPE source, AT 2019vcb (nicknamed Tormund by the Zwicky Transient Facility Collaboration), which was found during an …
Gaia Data Release 3. Properties of the line-broadening parameter derived with the Radial Velocity Spectrometer (RVS)
Smith, M.; Gosset, E.; Caffau, E. +38 more
Context. The third release of the Gaia catalogue contains radial velocities for 33 812 183 stars with effective temperatures ranging from 3100 K to 14 500 K. The measurements are based on the comparison of the spectra observed with the Radial Velocity Spectrometer (RVS; wavelength coverage: 846-870 nm, median resolving power: 11 500) to synthetic …