Search Publications
Discovery of the luminous X-ray ignition eRASSt J234402.9−352640. I. Tidal disruption event or a rapid increase in accretion in an active galactic nucleus?
Gromadzki, M.; Liu, Z.; Rau, A. +17 more
In November 2020, a new, bright object, eRASSt J234402.9−352640, was discovered in the second all-sky survey of SRG/eROSITA. The object brightened by a factor of at least 150 in 0.2-2.0 keV flux compared to an upper limit found six months previous, reaching an observed peak of 1.76−0.24+0.03 × 10−11 erg cm−2
The GRAVITY young stellar object survey. IX. Spatially resolved kinematics of hot hydrogen gas in the star-disk interaction region of T Tauri stars
Lutz, D.; Sturm, E.; Labadie, L. +58 more
Context. Hot atomic hydrogen emission lines in pre-main sequence stars serve as tracers for physical processes in the innermost regions of circumstellar accretion disks, where the interaction between a star and disk is the dominant influence on the formation of infalls and outflows. In the highly magnetically active T Tauri stars, this interaction…
The IACOB project. IX. Building a modern empirical database of Galactic O9 - B9 supergiants: Sample selection, description, and completeness
Simón-Díaz, S.; Urbaneja, M. A.; de Burgos, A. +1 more
Context. Blue supergiants (BSGs) are key objects for studying the intermediate phases of massive star evolution because they are very useful to constrain evolutionary models. However, the lack of a holistic study of a statistically significant and unbiased sample of these objects has lead to several long-standing questions about their physical pro…
Calibrating mid-infrared emission as a tracer of obscured star formation on H II-region scales in the era of JWST
Leroy, Adam K.; Rosolowsky, Erik; Glover, Simon C. O. +25 more
Measurements of the star formation activity on cloud scales are fundamental to uncovering the physics of the molecular cloud, star formation, and stellar feedback cycle in galaxies. Infrared (IR) emission from small dust grains and polycyclic aromatic hydrocarbons (PAHs) is widely used to trace the obscured component of star formation. However, th…
A 3D view of dwarf galaxies with Gaia and VLT/FLAMES. I. The Sculptor dwarf spheroidal
Salaris, Maurizio; Brown, Anthony G. A.; Helmi, Amina +12 more
We present a new homogeneous survey of VLT/FLAMES LR8 line-of-sight radial velocities (vlos) for 1604 resolved red giant branch stars in the Sculptor dwarf spheroidal galaxy. In addition, we provide reliable Ca II triplet metallicities, [Fe/H], for 1339 of these stars. From this combination of new observations (2257 individual spectra) …
The e-TidalGCs project. Modeling the extra-tidal features generated by Galactic globular clusters
Mastrobuono-Battisti, Alessandra; Khoperskov, Sergey; Di Matteo, Paola +5 more
We present the e-TidalGCs project, aimed at modeling and predicting the extra-tidal features surrounding all Galactic globular clusters for which 6D phase-space information, masses, and sizes are available (currently numbering 159 globular clusters). We focus the analysis and presentation of the results on the distribution of extra-tidal material …
Oxygen and iron in interstellar dust: An X-ray investigation
Waters, L. B. F. M.; Mutschke, H.; Costantini, E. +9 more
Understanding the chemistry of the interstellar medium (ISM) is fundamental for the comprehension of Galactic and stellar evolution. X-rays provide an excellent way to study the dust chemical composition and crystallinity along different sight lines in the Galaxy. In this work, we study the dust grain chemistry in the diffuse regions of the ISM in…
A new resonance-like feature in the outer disc of the Milky Way
Fouesneau, M.; Andrae, R.; Castro-Ginard, A. +18 more
Modern astrometric and spectroscopic surveys have revealed a wealth of structure in the phase space of stars in the Milky Way, with evidence of resonance features and non-equilibrium processes. Using the third Gaia data release, we present evidence of a new resonance-like feature in the outer disc of the Milky Way. The feature is most evident in t…
A super-Earth and a mini-Neptune near the 2:1 MMR straddling the radius valley around the nearby mid-M dwarf TOI-2096
Gabor, P.; Alonso, R.; Queloz, D. +72 more
Context. Several planetary formation models have been proposed to explain the observed abundance and variety of compositions of super-Earths and mini-Neptunes. In this context, multitransiting systems orbiting low-mass stars whose planets are close to the radius valley are benchmark systems, which help to elucidate which formation model dominates.…
Possible origin of the non-detection of metastable He I in the upper atmosphere of the hot Jupiter WASP-80b
Fossati, L.; Bonfanti, A.; Borsa, F. +5 more
Aims: We aim to constrain the origin of the non-detection of the metastable He I triplet at ≈10 830 Å obtained for the hot Jupiter WASP-80b.
Methods: We measure the X-ray flux of WASP-80 from archival observations and use it as input to scaling relations accounting for the coronal [Fe/O] abundance ratio in order to infer the extreme-ultr…