Search Publications
Direct characterization of young giant exoplanets at high spectral resolution by coupling SPHERE and CRIRES+
Reiners, A.; Lopez, M.; Costille, A. +19 more
Studies of atmospheres of directly imaged extrasolar planets with high-resolution spectrographs have shown that their characterization is predominantly limited by noise on the stellar halo at the location of the studied exoplanet. An instrumental combination of high-contrast imaging and high spectral resolution that suppresses this noise and resol…
Taking snapshots of the jet-ISM interplay: The case of PKS 0023-26
Morganti, Raffaella; Oosterloo, Tom; Tadhunter, Clive +2 more
We present high angular resolution (0.13-0.4 arcsec) ALMA CO(2-1) and 1.7 mm continuum observations of the far-infrared-bright galaxy PKS 0023−26 (z = 0.32), which hosts a young radio source as well as a luminous optical active galactic nucleus (AGN). Although young, the powerful radio source has already grown to a size of a few kiloparsec, making…
Jellyfish galaxy candidates in MACS J0717.5+3745 and 39 other clusters of the DAFT/FADA and CLASH surveys
Durret, F.; Jauzac, M.; Lobo, C. +1 more
Context. Galaxies in clusters undergo several phenomena, such as RPS and tidal interactions, that can trigger or quench their star formation and, in some cases, lead to galaxies acquiring unusual shapes and long tails - some become jellyfish.
Aims: We searched for jellyfish galaxy candidates in a sample of 40 clusters from the DAFT/FADA and C…
The GRAVITY young stellar object survey. VII. The inner dusty disks of T Tauri stars
Lutz, D.; Genzel, R.; Sturm, E. +55 more
Context. T Tauri stars are surrounded by dust and gas disks. As material reservoirs from which matter is accreted onto the central star and planets are built, these protoplanetary disks play a central role in star and planet formation.
Aims: We aim at spatially resolving at sub-astronomical unit (sub-au) scales the innermost regions of the pr…
Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets
Lecavelier des Etangs, A.; Vidal-Madjar, A.; Kiefer, F. +3 more
Mass is one of the most important parameters for determining the true nature of an astronomical object. Yet, many published exoplanets lack a measurement of their true mass, in particular those detected as a result of radial-velocity (RV) variations of their host star. For those examples, only the minimum mass, or m sin i, is known, owing to the i…
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…