Search Publications
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 …
The ALMA-ALPAKA survey. I. High-resolution CO and [CI] kinematics of star-forming galaxies at z = 0.5-3.5
Magdis, G. E.; Zanella, A.; Brammer, G. +13 more
Context. Spatially resolved studies of the kinematics of galaxies provide crucial insights into their assembly and evolution, enabling one to infer the properties of the dark matter halos, derive the impact of feedback on the interstellar medium (ISM), as well as measure and characterize the outflow motions. To date, most of the kinematic studies …
The hidden side of cosmic star formation at z > 3. Bridging optically dark and Lyman-break galaxies with GOODS-ALMA
Magnelli, B.; Daddi, E.; Elbaz, D. +37 more
Our current understanding of the cosmic star formation history at z > 3 is primarily based on UV-selected galaxies (Lyman-break galaxies, i.e., LBGs). Recent studies of H-dropouts (HST-dark galaxies) have revealed that we may be missing a large proportion of star formation that is taking place in massive galaxies at z > 3. In this work, we e…
Photometric binaries, mass functions, and structural parameters of 78 Galactic open clusters
Milone, Antonino P.; Vesperini, Enrico; Lagioia, Edoardo P. +8 more
Context. Binary stars play a crucial role in our understanding of the formation and evolution of star clusters and their stellar populations.
Aims: We use Gaia Data Release 3 to homogeneously analyze 78 Galactic open clusters and the unresolved binary systems they host, each composed of two main sequence (MS) stars.
Methods: We first inv…
A JWST inventory of protoplanetary disk ices. The edge-on protoplanetary disk HH 48 NE, seen with the Ice Age ERS program
van Dishoeck, E. F.; Pontoppidan, K. M.; Rocha, W. R. M. +24 more
Ices are the main carriers of volatiles in protoplanetary disks and are crucial to our understanding of the protoplanetary disk chemistry that ultimately sets the organic composition of planets. The Director's Discretionary-Early Release Science (DD-ERS) program Ice Age on the James Webb Space Telescope (JWST) follows the ice evolution through all…
Non-LTE radiative transfer with Turbospectrum
Bergemann, Maria; Hoppe, Richard; Plez, Bertrand +4 more
Physically realistic models of stellar spectra are needed in a variety of astronomical studies, from the analysis of fundamental stellar parameters, to studies of exoplanets and stellar populations in galaxies. Here we present a new version of the widely used radiative transfer code Turbospectrum, which we update so that it is able to perform spec…