Search Publications
Effect of binary evolution on the inferred initial and final core masses of hydrogen-rich, Type II supernova progenitors
Smith, N.; Renzo, M.; Zapartas, E. +3 more
The majority of massive stars, which are the progenitors of core-collapse supernovae (SNe), are found in close binary systems. In a previous work, we modeled the fraction of hydrogen-rich, Type II SN progenitors whose evolution is affected by mass exchange with their companion, finding this to be between ≈1/3 and 1/2 for most assumptions. Here we …
CARMENES detection of the Ca II infrared triplet and possible evidence of He I in the atmosphere of WASP-76b
Sánchez-López, A.; Snellen, I. A. G.; López-Puertas, M. +25 more
Ultra-hot Jupiters are highly irradiated gas giants with equilibrium temperatures typically higher than 2000 K. Atmospheric studies of these planets have shown that their transmission spectra are rich in metal lines, with some of these metals being ionised due to the extreme temperatures. Here, we use two transit observations of WASP-76b obtained …
Forever young white dwarfs: When stellar ageing stops
Córsico, Alejandro H.; Rebassa-Mansergas, Alberto; Althaus, Leandro G. +5 more
White dwarf stars are the most common end point of stellar evolution. The ultramassive white dwarfs are of special interest as they are related to type Ia supernovae explosions, merger events, and fast radio bursts. Ultramassive white dwarfs are expected to harbour oxygen-neon (ONe) cores as a result of single standard stellar evolution. However, …
The multiwavelength properties of red QSOs: Evidence for dusty winds as the origin of QSO reddening
Alexander, D. M.; Bowler, R. A. A.; Stalevski, M. +11 more
Fundamental differences in the radio properties of red quasars (QSOs), as compared to blue QSOs, have been recently discovered, positioning them as a potential key population in the evolution of galaxies and black holes across cosmic time. To elucidate the nature of these objects, we exploited a rich compilation of broad-band photometry and spectr…
Low-mass low-metallicity AGB stars as an efficient i-process site explaining CEMP-rs stars
Jorissen, A.; Escorza, A.; Masseron, T. +5 more
Context. Among carbon-enhanced metal-poor (CEMP) stars, some are found to be enriched in slow-neutron capture (s-process) elements (and are then tagged CEMP-s), some have overabundances in rapid-neutron capture (r-process) elements (tagged CEMP-r), and some are characterized by both s- and r-process enrichments (tagged CEMP-rs). The current distin…
A major asymmetric ice trap in a planet-forming disk. I. Formaldehyde and methanol
Booth, Alice S.; van Dishoeck, Ewine F.; Leemker, Margot +2 more
Context. The chemistry of planet-forming disks sets the exoplanet atmosphere composition and the prebiotic molecular content. Dust traps are of particular importance as pebble growth and transport are crucial for setting the chemistry where giant planets form.
Aims: The asymmetric Oph IRS 48 dust trap located at 60 au radius provides a unique…
Tempestuous life beyond R500: X-ray view on the Coma cluster with SRG/eROSITA. I. X-ray morphology, recent merger, and radio halo connection
Sunyaev, R.; Churazov, E.; Bykov, A. M. +2 more
This is the first paper in a series of studies of the Coma cluster using the SRG/eROSITA X-ray data obtained in the course of the calibration and performance verification observations. The data cover a ~3° × 3° area around the cluster with a typical exposure time of more than 20 ks. The stability of the instrumental background and operation of the…
A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B
Ménard, F.; Schmidt, T. O. B.; Ginski, C. +22 more
Context. Young giant planets and brown dwarf companions emit near-infrared radiation that can be linearly polarized up to several percent. This polarization can reveal the presence of an (unresolved) circumsubstellar accretion disk, rotation-induced oblateness of the atmosphere, or an inhomogeneous distribution of atmospheric dust clouds.
Aim…
Gaia Early Data Release 3. Updated radial velocities from Gaia DR2
Smith, M.; Gosset, E.; Allende Prieto, C. +40 more
Context. Gaia's Early Third Data Release (EDR3) does not contain new radial velocities because these will be published in Gaia's full third data release (DR3), expected in the first half of 2022. To maximise the usefulness of EDR3, Gaia's second data release (DR2) sources (with radial velocities) are matched to EDR3 sources to allow their DR2 radi…
An all-sky sample of intermediate- to high-mass OBA-type eclipsing binaries observed by TESS
Garcia, S.; De Ridder, J.; Aerts, C. +4 more
Context. Intermediate- to high-mass stars are the least numerous types of stars, and they are less well understood than their more numerous low-mass counterparts in terms of their internal physical processes. Modelling the photometric variability of a large sample of main-sequence intermediate- to high-mass stars in eclipsing binary systems will h…