Search Publications
2D chemical evolution models. II. Effects of multiple spiral arm patterns on O, Eu, Fe, and Ba abundance gradients
Recio-Blanco, A.; Palicio, P. A.; Poggio, E. +7 more
Context. According to observations and numerical simulations, the Milky Way could exhibit several spiral-arm modes of various pattern speeds, with the slower patterns located at larger galactocentric distances.
Aims: Our aim is to quantify the effects of the spiral arms on the azimuthal variations in the chemical abundances of oxygen and iron…
Mass-ratio distribution of contact binary stars
Pejcha, Ondřej; Pešta, Milan
The mass ratio q of a contact binary star evolves through mass transfer, magnetic braking, and thermal relaxation oscillations to low values until it crosses a critical threshold qmin. When this occurs, the binary undergoes the tidal Darwin instability, leading to a rapid coalescence of the components and to an observable brightening of…
A major asymmetric ice trap in a planet-forming disk. IV. Nitric oxide gas and a lack of CN tracing sublimating ices and a C/O ratio <1
van der Marel, N.; van Dishoeck, E. F.; Tabone, B. +5 more
Context. Most well-resolved disks observed with the Atacama Large Millimeter/submillimeter Array (ALMA) show signs of dust traps. These dust traps set the chemical composition of the planet-forming material in these disks, as the dust grains with their icy mantles are trapped at specific radii and could deplete the gas and dust at smaller radii of…
Evidence of an age gradient along the line of sight in the nuclear stellar disc of the Milky Way
Schultheis, M.; Rich, R. M.; Najarro, F. +3 more
Context. The nuclear stellar disc (NSD) is a flat dense stellar structure at the heart of the Milky Way. Recent work has shown that analogous structures are common in the nuclei of external spiral galaxies, where there is evidence of an age gradient that indicates that they form inside-out. However, the characterisation of the age of the NSD stell…
Two super-Earths at the edge of the habitable zone of the nearby M dwarf TOI-2095
Amado, P. J.; Caballero, J. A.; Pallé, E. +41 more
The main scientific goal of TESS is to find planets smaller than Neptune around stars that are bright enough to allow for further characterization studies. Given our current instrumentation and detection biases, M dwarfs are prime targets in the search for small planets that are in (or near) the habitable zone of their host star. In this work, we …
Extreme-ultraviolet fine structure and variability associated with coronal rain revealed by Solar Orbiter/EUI HRIEUV and SPICE
Barczynski, K.; Peter, H.; Chitta, L. P. +34 more
Context. Coronal rain is the most dramatic cooling phenomenon of the solar corona. Recent observations in the visible and UV spectrum have shown that coronal rain is a pervasive phenomenon in active regions. Its strong link with coronal heating through the thermal non-equilibrium (TNE) - thermal instability (TI) scenario makes it an essential diag…
Internal gravity waves in massive stars. II. Frequency analysis across stellar mass
Handler, G.; Ratnasingam, R. P.; Rogers, T. M. +4 more
Stars that are over 1.6 solar masses are generally known to possess convective cores and radiative envelopes, which allows for the propagation of outwardly travelling internal gravity waves (IGWs). Here, we study the generation and propagation of IGWs in such stars using two-dimensional, fully non-linear hydrodynamical simulations with realistic s…
Solar energetic electron events measured by MESSENGER and Solar Orbiter. Peak intensity and energy spectrum radial dependences: Statistical analysis
Lario, D.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +10 more
Context. We present a list of 61 solar energetic electron (SEE) events measured by the MESSENGER mission and the radial dependences of some parameters associated with these SEE events. The analysis covers the period from 2010 to 2015, when the heliocentric distance of MESSENGER varied between 0.31 and 0.47 au. We also show the radial dependences f…
Dark dust. II. Properties in the general field of the diffuse ISM
Siebenmorgen, R.
Distance estimates derived from spectroscopy or parallax have been unified by considering extinction by large grains. The addition of such a population of what is called dark dust to models of the diffuse interstellar medium is tested against a contemporary set of observational constraints. By respecting representative solid-phase element abundanc…
Probing the faint-end luminosity function of Lyman-alpha emitters at 3 < z < 7 behind 17 MUSE lensing clusters
Bauer, F. E.; Mahler, G.; Richard, J. +12 more
Context. This paper presents a study of the galaxy Lyman-alpha luminosity function (LF) using a large sample of 17 lensing clusters observed by the Multi Unit Spectroscopic Explorer (MUSE) at the ESO Very Large Telescope (VLT). The magnification resulting from strong gravitational lensing by clusters of galaxies and MUSE spectroscopic capabilities…