Search Publications
Resonance sweeping by a decelerating Galactic bar
Schönrich, Ralph; Chiba, Rimpei; Friske, Jennifer K. S.
We provide the first quantitative evidence for the deceleration of the Galactic bar from local stellar kinematics in agreement with dynamical friction by a typical dark matter halo. The kinematic response of the stellar disc to a decelerating bar is studied using secular perturbation theory and test particle simulations. We show that the velocity …
Chemo-kinematics of the Gaia RR Lyrae: the halo and the disc
Belokurov, Vasily; Iorio, Giuliano
We present the results of a multicomponent kinematic model of a large sample of RR Lyrae detected by Gaia. By imposing a fourfold symmetry and employing Gaia proper motions, we are able to infer the behaviour of the velocity ellipsoid between ≈3 and ≈30 kpc from the centre of the Galaxy. We detect the presence of two distinct components: a dominan…
Indications of stellar coronal mass ejections through coronal dimmings
Veronig, Astrid M.; Dissauer, Karin; Hudson, Hugh S. +3 more
Coronal mass ejections (CMEs) are huge expulsions of magnetized matter from the Sun and stars, traversing space with speeds of millions of kilometres per hour. Solar CMEs can cause severe space weather disturbances and consumer power outages on Earth, whereas stellar CMEs may even pose a hazard to the habitability of exoplanets. Although CMEs ejec…
A Quarter Century of Wind Spacecraft Discoveries
Verscharen, Daniel; Hurley, Kevin; Wicks, Robert T. +11 more
The Wind spacecraft, launched on November 1, 1994, is a critical element in NASA's Heliophysics System Observatory (HSO) - a fleet of spacecraft created to understand the dynamics of the Sun-Earth system. The combination of its longevity (>25 years in service), its diverse complement of instrumentation, and high resolution and accurate measurem…
Characterizing the dust content of disk substructures in TW Hydrae
Huang, J.; Ribas, Á.; Carrasco-González, C. +4 more
Context. A key piece of information to understand the origin and role of protoplanetary disk substructures is their dust content. In particular, disk substructures associated with gas pressure bumps can work as dust traps, accumulating grains and reaching the necessary conditions to trigger the streaming instability.
Aims: In order to shed so…
Gaia Early Data Release 3. The Galactic anticentre
Prusti, T.; Mazeh, T.; Zucker, S. +417 more
Aims: We aim to demonstrate the scientific potential of the Gaia Early Data Release 3 (EDR3) for the study of different aspects of the Milky Way structure and evolution and we provide, at the same time, a description of several practical aspects of the data and examples of their usage.
Methods: We used astrometric positions, proper motio…
The CARMENES search for exoplanets around M dwarfs. Stellar atmospheric parameters of target stars with SteParSyn
Nagel, E.; Amado, P. J.; Caballero, J. A. +24 more
We determined effective temperatures, surface gravities, and metallicities for a sample of 343 M dwarfs observed with CARMENES, the double-channel, high-resolution spectrograph installed at the 3.5 m telescope at Calar Alto Observatory. We employed SteParSyn, a Bayesian spectral synthesis implementation particularly designed to infer the stellar a…
A non-energetic mechanism for glycine formation in the interstellar medium
van Dishoeck, E. F.; Kofman, V.; Ioppolo, S. +8 more
The detection of the amino acid glycine and its amine precursor methylamine on the comet 67P/Churyumov-Gerasimenko by the Rosetta mission provides strong evidence for a cosmic origin of amino acids on Earth. How and when such molecules form along the process of star formation remains debated. Here we report the laboratory detection of glycine form…
A gravitationally lensed supernova with an observable two-decade time delay
Richard, Johan; Whitaker, Katherine E.; Brammer, Gabriel B. +5 more
When the light from a distant object passes very near to a foreground galaxy or cluster, gravitational lensing can cause it to appear as multiple images on the sky1. If the source is variable, it can be used to constrain the cosmic expansion rate2 and dark energy models3. Achieving these cosmological goals requires…
The VANDELS ESO public spectroscopic survey. Final data release of 2087 spectra and spectroscopic measurements
Maccagni, D.; Cimatti, A.; Elbaz, D. +94 more
VANDELS is an ESO Public Spectroscopic Survey designed to build a sample of high-signal-to-noise ratio, medium-resolution spectra of galaxies at redshifts between 1 and 6.5. Here we present the final Public Data Release of the VANDELS Survey, comprising 2087 redshift measurements. We provide a detailed description of sample selection, observations…