Search Publications
The CARMENES search for exoplanets around M dwarfs. Rotational variation in activity indicators of Ross 318, YZ CMi, TYC 3529-1437-1, and EV Lac
Amado, P. J.; Bauer, F. F.; Caballero, J. A. +22 more
Context. The Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Échelle Spectrographs (CARMENES) instrument is searching for periodic radial-velocity (RV) variations of M dwarfs, which are induced by orbiting planets. However, there are other potential sources of such variations, including rotational modu…
The VLT-FLAMES Tarantula Survey. Observational evidence for two distinct populations of massive runaway stars in 30 Doradus
van Loon, J. Th.; Crowther, P. A.; Lennon, D. J. +17 more
Context. The origin of massive runaway stars is an important unsolved problem in astrophysics. Two main scenarios have been proposed, namely: dynamical ejection or release from a binary at the first core collapse. However, their relative contribution remains heavily debated.
Aims: Taking advantage of two large spectroscopic campaigns towards …
Transit timing variations of AU Microscopii b and c
Alonso, R.; Deleuil, M.; Erikson, A. +76 more
Here we report large-amplitude transit timing variations (TTVs) for AU Microcopii b and c as detected in combined TESS (2018, 2020) and CHEOPS (2020, 2021) transit observations. AU Mic is a young planetary system with a debris disk and two transiting warm Neptunes. A TTV on the order of several minutes was previously reported for AU Mic b, which w…
Surface magnetism of rapidly rotating red giants: Single versus close binary stars
Yu, Jie; Gaulme, Patrick; Gehan, Charlotte
According to dynamo theory, stars with convective envelopes efficiently generate surface magnetic fields, which manifest as magnetic activity in the form of starspots, faculae, and/or flares, when their rotation period is shorter than their convective turnover time. Most red giants, having undergone significant spin down while expanding, have slow…
The Radcliffe wave as the gas spine of the Orion arm
Benjamin, R. A.; Gallagher, J. S., III; Drimmel, R. +7 more
The Radcliffe wave is a ∼3 kpc long coherent gas structure containing most of the star-forming complexes near the Sun. In this Letter we aim to find a Galactic context for the Radcliffe wave by looking into a possible relationship between the gas structure and the Orion (local) arm. We use catalogs of massive stars and young open clusters based on…
And then they were two: Detection of non-thermal radio emission from the bow shocks of two runaway stars
Menten, K. M.; Brose, R.; Gvaramadze, V. V. +7 more
Context. In recent years, winds from massive stars have been considered promising sites for investigating relativistic particle acceleration. In particular, the resulting bow-shaped shocks from the interaction of the supersonic winds of runaway stars with interstellar matter have been intensively observed at many different wavelengths, from radio …
The disk of FU Orionis viewed with MATISSE/VLTI. First interferometric observations in L and M bands
Waters, L. B. F. M.; Zhu, Z.; Liu, H. B. +30 more
Aims: We studied the accretion disk of the archetypal eruptive young star FU Orionis with the use of mid-infrared interferometry, which enabled us to resolve the innermost regions of the disk down to a spatial resolution of 3 milliarcseconds (mas) in the L band, that is, within 1 au of the protostar.
Methods: We used the interferometric …
Stellar dating using chemical clocks and Bayesian inference
Chaplin, W. J.; Moya, A.; Sarro, L. M. +3 more
Context. Dating stars is a major challenge with a deep impact on many astrophysical fields. One of the most promising techniques for this is using chemical abundances. Recent space- and ground-based facilities have improved the quantity of stars with accurate observations. This has opened the door for using Bayesian inference tools to maximise the…
Escape from the Bermuda cluster: Orphanization by multiple stellar ejections
Weiler, M.; Maíz Apellániz, J.; Barbá, R. H. +1 more
Context. Dynamical interactions in young stellar clusters can eject massive stars early in their lives and significantly alter their mass functions. If all of the most massive stars are lost, we are left with an orphan cluster.
Aims: We study the Bermuda cluster (Villafranca O-014 NW), the most significant young stellar group in the North Ame…
A bottom-up search for Lyman-continuum leakage in the Hubble Ultra Deep Field
Hayes, M.; Melinder, J.; Rivera-Thorsen, T. E.
Context. When studying the production and escape of Lyman continuum (LyC) from galaxies, it is standard to rely on an array of indirect observational tracers in the preselection of candidate leakers.
Aims: In this work, we investigate how much ionizing radiation might be missed due to these selection criteria by completely removing them and p…