Search Publications
The VLT/SPHERE view of the ATOMIUM cool evolved star sample. I. Overview: Sample characterization through polarization analysis
Waters, L. B. F. M.; Menten, K. M.; Sahai, R. +32 more
Context. Low- and intermediate-mass asymptotic giant stars and massive red supergiant stars are important contributors to the chemical enrichment of the Universe. They are among the most efficient dust factories of the Galaxy, harboring chemically rich circumstellar environments. Yet, the processes that lead to dust formation or the large-scale sh…
Chemistry of multiple stellar populations in the mono-metallic, in situ, bulge globular cluster NGC 6388
Bragaglia, Angela; Carretta, Eugenio
We present the homogeneous abundance analysis for a combined sample of 185 giants in the bulge globular cluster (GC) NGC 6388. Our results are used to describe the multiple stellar populations and differences or analogies with bulge field stars. Proton-capture elements indicate that a single class of first-generation polluters is sufficient to rep…
A low-metallicity massive contact binary undergoing slow Case A mass transfer: A detailed spectroscopic and orbital analysis of SSN 7 in NGC 346 in the SMC
Pauli, D.; Rickard, M. J.
Context. Most massive stars are believed to be born in close binary systems where they can exchange mass, which impacts the evolution of both binary components. Their evolution is of great interest in the search for the progenitors of gravitational waves. However, there are unknowns in the physics of mass transfer as observational examples are rar…
A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS4 measured from stellar occultations
Barnes, J. W.; Burwitz, V.; Hueso, R. +201 more
Context. The physical characterization of trans-Neptunian objects is essential for improving our understanding of the formation and evolution of our Solar System. Stellar occultation is a ground-based technique that can be successfully used to determine some of the TNOs' fundamental physical properties with high precision, such as size and shape. …
Star formation in IC1396: Kinematics and subcluster structure revealed by Gaia
Fang, Min; García-Álvarez, David; Kim, Jinyoung Serena +3 more
Aims: We investigate the star formation history of the IC1396 region by studying its kinematics and completing the population census.
Methods: We used multiwavelength data, combining optical spectroscopy to identify and classify new members and near-infrared photometry to trace shocks, jets, and outflows as well as the interactions betwe…
TITANS metal-poor reference stars. II. Red giants and CEMP stars
Valentini, M.; Chiappini, C.; Jorissen, A. +6 more
Context. Representative samples of F-, G-, K-type stars located outside of the solar neighbourhood have started to become available in spectroscopic surveys. The fraction of metal-poor ([Fe/H] ≲ −0.8 dex) giants becomes increasingly relevant towards greater distances. In metal-poor stars, effective temperatures (Teff) based on local the…
Evidence for non-thermal X-ray emission from the double Wolf-Rayet colliding-wind binary Apep
Altamirano, D.; del Palacio, S.; García, F. +5 more
Context. Massive colliding-wind binaries (CWBs) can be non-thermal sources. The emission produced in their wind-collision region (WCR) encodes information of both the shock properties and the relativistic electrons accelerated in them. The recently discovered system Apep, a unique massive system hosting two Wolf-Rayet stars, is the most powerful s…
Small-scale loops heated to transition region temperatures and their chromospheric signatures in the simulated solar atmosphere
Leenaarts, J.; Danilovic, S.; Rempel, M. +2 more
Context. Recent observations have revealed loop-like structures at very small scales visible in observables that sample the transition region (TR) and even coronal temperatures. These structures are referred to as either `unresolved fine structures', `dynamic cool loops', `miniature hot loops' or `campfires' depending on the observables in which t…
TOI-1416: A system with a super-Earth planet with a 1.07 d period
Fridlund, M.; Pallé, E.; Guenther, E. W. +49 more
TOI-1416 (BD+42 2504, HIP 70705) is a V =10 late G- or early K-type dwarf star. TESS detected transits in its Sectors 16, 23, and 50 with a depth of about 455 ppm and a period of 1.07 days. Radial velocities (RVs) confirm the presence of the transiting planet TOI-1416 b, which has a mass of 3.48 ± 0.47 M⊕ and a radius of 1.62 ± 0.08 R
The young mini-Neptune HD 207496b that is either a naked core or on the verge of becoming one
Deleuil, M.; Winn, J. N.; Adibekyan, V. +39 more
Aims: We report the discovery and characterisation of the transiting mini-Neptune HD 207496 b (TOI-1099) as part of a large programme that aims to characterise naked core planets.
Methods: We obtained HARPS spectroscopic observations, one ground-based transit, and high-resolution imaging which we combined with the TESS photometry to conf…