Search Publications
Bridging the gap between Monte Carlo simulations and measurements of the LISA Pathfinder test-mass charging for LISA
Cesarini, A.; Grimani, C.; Fabi, M. +2 more
Context. Cubic gold-platinum free-falling test masses (TMs) constitute the mirrors of future LISA and LISA-like interferometers for low-frequency gravitational wave detection in space. High-energy particles of Galactic and solar origin charge the TMs and thus induce spurious electrostatic and magnetic forces that limit the sensitivity of these int…
Constraints on the structure and seasonal variations of Triton's atmosphere from the 5 October 2017 stellar occultation and previous observations
Forget, F.; Strobel, D. F.; Hueso, R. +234 more
Context. A stellar occultation by Neptune's main satellite, Triton, was observed on 5 October 2017 from Europe, North Africa, and the USA. We derived 90 light curves from this event, 42 of which yielded a central flash detection.
Aims: We aimed at constraining Triton's atmospheric structure and the seasonal variations of its atmospheric press…
Deep study of A399-401: Application of a wide-field facet calibration
Brunetti, G.; Shimwell, T. W.; Tasse, C. +6 more
Context. Diffuse synchrotron emission pervades numerous galaxy clusters, indicating the existence of cosmic rays and magnetic fields throughout the intra-cluster medium. The general consensus is that this emission is generated by shocks and turbulence that are activated during cluster merger events and cause a (re-)acceleration of particles to hig…
A first glimpse at the line-of-sight structure of the Milky Way's nuclear stellar disc
Nogueras-Lara, F.
Context. The nuclear stellar disc (NSD) is a dense stellar structure at the centre of our Galaxy. Given its proximity, it constitutes a unique laboratory to understand other galactic nuclei. Nevertheless, the high crowding and extinction hamper its study, and even its morphology and kinematics are not yet totally clear.
Aims: In this work we …
The evolution of temperature and density structures of OB cluster-forming molecular clumps
Liu, H. B.; Menten, K. M.; Csengeri, T. +4 more
Context. OB star clusters originate from parsec-scale massive molecular clumps, while individual stars may form in ≲0.1 pc scale dense cores. The thermal properties of the clump gas are key factors governing the fragmentation process, and are closely affected by gas dynamics and feedback of forming stars.
Aims: We aim to understand the evolut…
MADYS: the Manifold Age Determination for Young Stars. I. Isochronal age estimates and model comparison
Bonavita, M.; Squicciarini, V.
Context. The unrivalled astrometric and photometric capabilities of the Gaia mission have given new impetus to the study of young stars: both from an environmental perspective, as members of comoving star-forming regions, and from an individual perspective, as targets amenable to planet-hunting direct-imaging observations.
Aims: In view of th…
Clustered star formation at early evolutionary stages. Physical and chemical analysis of the young star-forming regions ISOSS J22478+6357 and ISOSS J23053+5953
Galván-Madrid, R.; Henning, Th.; Beuther, H. +20 more
Context. The process of high-mass star formation during the earliest evolutionary stages and the change over time of the physical and chemical properties of individual fragmented cores are still not fully understood.
Aims: We aim to characterize the physical and chemical properties of fragmented cores during the earliest evolutionary stages i…
Multi-instrument STIX microflare study
Krucker, Säm; Veronig, Astrid M.; Podladchikova, Tatiana +7 more
Context. During its commissioning phase in 2020, the Spectrometer/Telescope for Imaging X-rays (STIX) on board the Solar Orbiter spacecraft observed 69 microflares. The two most significant events from this set (of GOES class B2 and B6) were observed on-disk from the spacecraft as well as from Earth and analysed in terms of the spatial, temporal, …
KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +18 more
Aims: The light curve of the microlensing event KMT-2021-BLG-1898 exhibits a short-term central anomaly with double-bump features that cannot be explained by the usual binary-lens or binary-source interpretations. With the aim of interpreting the anomaly, we analyze the lensing light curve under various sophisticated models.
Methods: We …
Discovery of a highly magnetic He-sdO star from a double-degenerate binary merger
Geier, S.; Heber, U.; Justham, S. +4 more
Helium-rich hot subdwarf stars of spectral type O (He-sdO) are considered prime candidates for stellar merger remnants. Such events should lead to the generation of strong magnetic fields. However, no magnetic He-sdO has yet been unambiguously discovered despite the high magnetic rate (20%) among white dwarf stars, the progeny of hot subdwarfs. He…