Search Publications
JWST photometry and astrometry of 47 Tucanæ: Discontinuity in the stellar sequence at the star–brown dwarf transition
Anderson, J.; Bedin, L. R.; Nardiello, D. +10 more
Using JWST Near Infrared Camera (NIRCam) images of the globular cluster 47 Tucanæ (or NGC 104), taken at two epochs just 7 months apart, we derived proper-motion membership down to mF322W2 ∼ 27. We identified an intriguing feature at the very low-mass end of the main sequence, around ∼0.08 Mṡ, at magnitudes mF322W2…
Overdensity of Lyman-break galaxy candidates around hot-dust-obscured galaxies
Tsai, Chao-Wei; Jun, Hyunsung D.; Eisenhardt, Peter R. M. +15 more
Hot dust-obscured galaxies (hot DOGs) are a family of hyper-luminous, heavily obscured quasars. A number of studies based on the identification of companions at optical to far-infrared (FIR) wavelengths have shown that these objects reside in significantly overdense regions of the Universe. Here we present further characterisation of their environ…
The jet paths of radio active galactic nuclei and their cluster weather
Finoguenov, A.; Heywood, I.; Hardcastle, M. J. +21 more
We studied bent radio sources within X-ray galaxy groups in the COSMOS and XMM-LSS fields. The radio data were obtained from the MeerKAT International GHz Tiered Extragalactic Explorations data release 1 (MIGHTEE-DR1) at 1.2–1.3 GHz, with angular resolutions of 8.9″ and 5″, and median noise levels of rmsmed ∼ = 3.5 and 5.5 µJy/bea…
A new look at disk winds and external photoevaporation in the σ-Orionis cluster
Bayo, A.; Alcalá, J. M.; Hernández, J. +12 more
Context. Disk winds play a crucial role in the evolution of protoplanetary disks. Typical conditions for star and planet formation are in regions with intermediate or strong UV radiation fields produced by massive stars. In these environments, internally or externally driven winds can occur. The σ-Orionis cluster is the ideal site to study disk wi…
Variations in Venusian magnetic topology during an interplanetary coronal mass ejection passage: A multifluid magnetohydrodynamics study
Cao, Jinbin; Mazelle, Christian; Ge, Yasong +7 more
The global effects on Venusian magnetic topology and ion escape during the significant solar-wind disturbances caused by the interplanetary coronal mass ejection (ICME) remain an open area of research. This study examined a particularly intense ICME interaction with Venus on November 5, 2011, using a global multifluid magnetohydrodynamics (MHD) mo…
CHEOPS observations confirm nodal precession in the WASP-33 system
Alonso, R.; Deleuil, M.; Erikson, A. +86 more
Aims. We aim to observe the transits and occultations of WASP-33 b, which orbits a rapidly rotating δ Scuti pulsator, with the goal of measuring the orbital obliquity via the gravity-darkening effect, and constraining the geometric albedo via the occultation depth. Methods. We observed four transits and four occultations with CHEOPS, and employ a …
Multiple stellar populations at less evolved stages: IV. Evidence of helium enrichments in four Magellanic globular clusters
Wang, Li; Li, Chengyuan; Ji, Xin +1 more
Most globular clusters in the local group show multiple stellar populations, a pattern defined by variations of several light elements, with some also displaying dispersions in heavy elements. Since helium is the most immediate product of hydrogen burning, almost all models suggest that second-generation stars should show different levels of heliu…
Deep high-resolution L band spectroscopy in the β Pictoris planetary system
Viswanath, Gayathri; Mollière, Paul; Janson, Markus +4 more
The β Pictoris system, with its two directly imaged planets β Pic b and β Pic c and its well characterised debris disk, is a prime target for detailed characterisation of young planetary systems. Here, we present high-resolution and high-contrast LM band spectroscopy with CRIRES+ of the system, primarily for the purpose of atmospheric characterisa…
Characterising WASP-43b's interior structure: Unveiling tidal decay and apsidal motion
Rauer, H.; Gandolfi, D.; Csizmadia, Sz. +8 more
Context. Recent developments in exoplanetary research highlight the importance of Love numbers in understanding the internal dynamics, formation, migration history, and potential habitability of exoplanets. Love numbers represent crucial parameters that gauge how exoplanets respond to external forces such as tidal interactions and rotational effec…
Investigating explosive events in a 3D quiet-Sun model: Transition region and coronal response
Chen, Yajie; Peter, Hardi; Przybylski, Damien
Context. Transition region explosive events are characterized by the non-Gaussian profiles of the emission lines that form at transition region temperatures, and they are believed to be manifestations of small-scale reconnection events in the transition region. Aims. Traditionally, the enhanced emission at the line wings is interpreted as bi-direc…