Search Publications
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…
Hubble Asteroid Hunter. I. Identifying asteroid trails in Hubble Space Telescope images
Popescu, Marcel; de Marchi, Guido; Merín, Bruno +11 more
Context. Large and publicly available astronomical archives open up new possibilities to search for and study Solar System objects. However, advanced techniques are required to deal with the large amounts of data. These unbiased surveys can be used to constrain the size distribution of minor bodies, which represents a piece of the puzzle for the f…
Unveiling the nature of 12 new low-luminosity Galactic globular cluster candidates
Minniti, D.; Ripepi, V.; Saito, R. K. +10 more
Context. The Galactic globular cluster system is incompletely known, especially in the low-latitude regions of the Galactic bulge and disk. We report the physical characterisation of 12 star clusters in the Milky Way, most of which are explored here for the first time.
Aims: Our primary aim is determining their main physical parameters, such …
The Influence Of Individual Stars On The long-Term Dynamics Of Comets C/2014 UN271 And C/2017 K2
Dybczyński, Piotr A.; Królikowska, Małgorzata
Context. In June 2021, the discovery of an unusual comet C/2014 UN271 (Bernardinelli-Bernstein) was announced. Its cometary activity beyond the orbit of Uranus has also refreshed interest in similar objects, including C/2017 K2 (PANSTARRS). Another peculiarity of these objects is the long interval of positional data, taken at large heli…
Physics of ULIRGs with MUSE and ALMA: The PUMA project. III. Incidence and properties of ionised gas disks in ULIRGs, associated velocity dispersion, and its dependence on starburstiness
Maiolino, R.; Colina, L.; Perna, M. +11 more
Context. A classical scenario suggests that ultra-luminous infrared galaxies (ULIRGs) transform colliding spiral galaxies into a spheroid-dominated early-type galaxy. Recent high-resolution simulations have instead shown that, under some circumstances, rotation disks can be preserved during the merging process or rapidly regrown after coalescence.…