Search Publications
A highly non-Keplerian protoplanetary disc. Spiral structure in the gas disc of CQ Tau
Lodato, G.; Testi, L.; Facchini, S. +9 more
Context. In recent years high-angular-resolution observations have revealed that circumstellar discs appear in a variety of shapes with diverse substructures being ubiquitous. This has given rise to the question of whether these substructures are triggered by planet-disc interactions. Besides direct imaging, one of the most promising methods to di…
Determination of the escape velocity of the Milky Way using a halo sample selected based on proper motion
Helmi, Amina; Koppelman, Helmer H.
Context. The Gaia mission has provided the largest catalogue ever of sources with tangential velocity information. However, it is difficult to use this catalogue for dynamical studies because most of the stars lack line-of-sight velocity measurements. Recently, we presented a selection of ∼107 halo stars with accurate distances that wer…
Extreme ultra-soft X-ray variability in an eROSITA observation of the narrow-line Seyfert 1 galaxy 1H 0707-495
Buchner, J.; Nandra, K.; Merloni, A. +9 more
The ultra-soft narrow-line Seyfert 1 galaxy 1H 0707-495 is a well-known and highly variable active galactic nucleus (AGN), with a complex, steep X-ray spectrum, and has been studied extensively with XMM-Newton. 1H 0707-495 was observed with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) aboard the Spectrum-Roentgen-Gamma (S…
BEAST begins: sample characteristics and survey performance of the B-star Exoplanet Abundance Study
Henning, Thomas; Reffert, Sabine; Langlois, Maud +20 more
While the occurrence rate of wide giant planets appears to increase with stellar mass at least up through the A-type regime, B-type stars have not been systematically studied in large-scale surveys so far. It therefore remains unclear up to what stellar mass this occurrence trend continues. The B-star Exoplanet Abundance Study (BEAST) is a direct …
Modelling a multi-spacecraft coronal mass ejection encounter with EUHFORIA
Palmerio, E.; Temmer, M.; Poedts, S. +6 more
Context. Coronal mass ejections (CMEs) are a manifestation of the Sun's eruptive nature. They can have a great impact on Earth, but also on human activity in space and on the ground. Therefore, modelling their evolution as they propagate through interplanetary space is essential.
Aims: EUropean Heliospheric FORecasting Information Asset (EUHF…
Connecting X-ray nuclear winds with galaxy-scale ionised outflows in two z ∼ 1.5 lensed quasars
Marconi, A.; Vignali, C.; Comastri, A. +15 more
Aims: Outflows driven by active galactic nuclei (AGN) are expected to have a significant impact on host galaxy evolution, but the matter of how they are accelerated and propagated on galaxy-wide scales is still under debate. This work addresses these questions by studying the link between X-ray, nuclear ultra-fast outflows (UFOs), and extende…
Abundances of neutron-capture elements in thin- and thick-disc stars in the solar neighbourhood
Tautvaišienė, G.; Drazdauskas, A.; Mikolaitis, Š. +4 more
Aims: The aim of this work is to determine abundances of neutron-capture elements for thin- and thick-disc F, G, and K stars in several selected sky fields near the north ecliptic pole and to compare the results with the Galactic chemical evolution models, to explore elemental gradients according to stellar ages, mean galactocentric distances…
A large sub-Neptune transiting the thick-disk M4 V TOI-2406
Gabor, P.; Queloz, D.; Henning, T. +71 more
Context. Large sub-Neptunes are uncommon around the coolest stars in the Galaxy and are rarer still around those that are metal-poor. However, owing to the large planet-to-star radius ratio, these planets are highly suitable for atmospheric study via transmission spectroscopy in the infrared, such as with JWST.
Aims: Here we report the discov…
A high pitch angle structure in the Sagittarius Arm
Castro-Ginard, A.; Benjamin, R. A.; Krone-Martins, A. +6 more
Context. In spiral galaxies, star formation tends to trace features of the spiral pattern, including arms, spurs, feathers, and branches. However, in our own Milky Way, it has been challenging to connect individual star-forming regions to their larger Galactic environment owing to our perspective from within the disk. One feature in nearly all mod…
The role of AGN and obscuration in the position of the host galaxy relative to the main sequence
Shirley, R.; Ciesla, L.; Buat, V. +5 more
We use X-ray active galactic nuclei (AGN) observed by the Chandra X-ray Observatory within the 9.3 deg2 Boötes field of the NDWFS to study whether there is a correlation between X-ray luminosity (LX) and star formation rate (SFR) of the host galaxy, at 0.5 < z < 2.0, with respect to the position of the galaxy to the mai…