Search Publications
The "Maggie" filament: Physical properties of a giant atomic cloud
Schneider, N.; Klessen, R. S.; Beuther, H. +19 more
Context. The atomic phase of the interstellar medium plays a key role in the formation process of molecular clouds. Due to the line-of-sight confusion in the Galactic plane that is associated with its ubiquity, atomic hydrogen emission has been challenging to study.
Aims: We investigate the physical properties of the "Maggie" filament, a larg…
eROSITA calibration and performance verification phase: High-mass X-ray binaries in the Magellanic Clouds
Haberl, F.; Udalski, A.; Freyberg, M. J. +8 more
Context. During its performance verification phase, the soft X-ray instrument eROSITA on board the Spektrum-Roentgen-Gamma (SRG) spacecraft observed large regions in the Magellanic Clouds in which almost 40 known high-mass X-ray binaries (HMXBs, including candidates) are located.
Aims: We looked for new HMXBs in the eROSITA data, searched for…
The origin of early-type runaway stars from open clusters
Heber, U.; Irrgang, A.; Bhat, A.
Runaway stars are ejected from their place of birth in the Galactic disk, with some young B-type runaways found several tens of kiloparsecs from the plane traveling at speeds beyond the escape velocity, which calls for violent ejection processes. Young open clusters are a likely place of origin, and ejection may be either through N-body interactio…
Magnetic cloud prediction model for forecasting space weather relevant properties of Earth-directed coronal mass ejections
Nandy, Dibyendu; Pal, Sanchita; Kilpua, Emilia K. J.
Context. Coronal mass ejections (CMEs) are major eruptive events on the Sun that result in the ejection of large-scale magnetic clouds (MCs) in interplanetary space, consisting of plasma with enhanced magnetic fields whose direction changes coherently when measured in situ. The severity of CME-induced geomagnetic perturbations and space weather im…
CHEOPS finds KELT-1b darker than expected in visible light. Discrepancy between the CHEOPS and TESS eclipse depths
Guterman, P.; Alonso, R.; Deleuil, M. +78 more
Recent studies based on photometry from the Transiting Exoplanet Survey Satellite (TESS) have suggested that the dayside of KELT-1b, a strongly irradiated brown dwarf, is significantly brighter in visible light than what would be expected based on Spitzer observations in the infrared. We observed eight eclipses of KELT-1b with CHaracterising ExOPl…
Stellar feedback in M83 as observed with MUSE. I. Overview, an unprecedented view of the stellar and gas kinematics and evidence of outflowing gas
Della Bruna, Lorenza; Robert, Carmelle; Rousseau-Nepton, Laurie +14 more
Context. Young massive stars inject energy and momentum into the surrounding gas, creating a multi-phase interstellar medium (ISM) and regulating further star formation. The main challenge of studying stellar feedback proves to be the variety of scales spanned by this phenomenon, ranging from the immediate surrounding of the stars (H II regions, 1…
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…