Search Publications
Properties of globular clusters formed in dark matter mini-halos
Vitral, Eduardo; Boldrini, Pierre
We seek to differentiate dynamical and morphological attributes between globular clusters (GCs) that were formed inside their own dark matter (DM) mini-halo from those who were not. We employed high-resolution full N-body simulations on a Graphics Processing Unit (GPU) of the GCs with and without a DM mini-halo, orbiting a Fornax-like dwarf galaxy…
Analysis of the arm-like structure in the outer disk of PDS 70. Spiral density wave or vortex?
Absil, O.; Christiaens, V.; Juillard, S.
Context. Observing dynamical interactions between planets and disks is key to understanding their formation and evolution. Two protoplanets have recently been discovered within the PDS 70 protoplanetary disk, along with an arm-like structure toward the northwest of the star.
Aims: Our aim is to constrain the morphology and origin of this arm-…
Constraining the multi-scale dark-matter distribution in CASSOWARY 31 with strong gravitational lensing and stellar dynamics
Grillo, C.; Wang, H.; Christensen, L. +6 more
We study the inner structure of the group-scale lens CASSOWARY 31 (CSWA 31) by adopting both strong lensing and dynamical modeling. CSWA 31 is a peculiar lens system. The brightest group galaxy (BGG) is an ultra-massive elliptical galaxy at z = 0.683 with a weighted mean velocity dispersion of σ = 432 ± 31 km s−1. It is surrounded by gr…
The Great Flare of 2021 November 19 on AD Leonis. Simultaneous XMM-Newton and TESS observations
Stelzer, B.; Caramazza, M.; Raetz, S. +2 more
We present a detailed analysis of a superflare on the active M dwarf star AD Leonis. The event presents a rare case of a stellar flare that was simultaneously observed in X-rays (with XMM-Newton) and in the optical (with the Transiting Exoplanet Survey Satellite, TESS). The radiated energy in the 0.2 − 12 keV X-ray band (1.26 ± 0.01 × 1033
Water content trends in K2-138 and other low-mass multi-planetary systems
Deleuil, M.; Morel, T.; Mousis, O. +5 more
Context. Both rocky super-Earths and volatile-rich sub-Neptunes have been found simultaneously in multi-planetary systems, suggesting that these systems are appropriate to study different composition and formation pathways within the same environment.
Aims: We perform a homogeneous interior structure analysis of five multi-planetary systems t…
Three new high-mass X-ray binaries in the Large Magellanic Cloud
Haberl, F.; Udalski, A.; Vasilopoulos, G. +4 more
Context. The Magellanic Clouds host a large population of high-mass X-ray binary (HMXB) systems, and although the Large Magellanic Cloud (LMC) is an order of magnitude more massive than the Small Magellanic Cloud, there are significantly fewer known HMXBs in the former.
Aims: We conducted a search for new HMXBs in XMM-Newton observations that…
Warp and flare of the Galactic disc revealed with supergiants by Gaia EDR3
López-Corredoira, M.; Chrobáková, Ž.; Nagy, R.
Context. The outer Galactic disc contains some features such as the warp and flare, whose origin is still debated. The Gaia data provide an excellent opportunity to probe the Galactic disc at large distances and study these features.
Aims: We derive the density distributions of the average (old) whole population and the supergiants (represent…
Improving CME evolution and arrival predictions with AMR and grid stretching in Icarus
Poedts, S.; Verbeke, C.; Wijsen, N. +1 more
Context. Coronal mass ejections (CMEs) are one of the main drivers of disturbances in interplanetary space. Strong CMEs, when directed towards the Earth, cause geomagnetic storms upon interacting with the Earth's magnetic field, and can cause significant damage to our planet and affect everyday life. As such, efficient space weather prediction too…
The KOBE experiment: K-dwarfs Orbited By habitable Exoplanets. Project goals, target selection, and stellar characterization
Deleuil, M.; Aceituno, J.; Azzaro, M. +33 more
The detection of habitable worlds is one of humanity's greatest endeavors. Thus far, astrobiological studies have shown that one of the most critical components for allowing life to develop is liquid water. Its chemical properties and its capacity to dissolve and, hence, transport other substances makes this constituent a key piece in this regard.…
[C II] 158 µm line emission from Orion A. II. Photodissociation region physics
Wolfire, M. G.; Teyssier, D.; Goicoechea, J. R. +10 more
Context. The [C II] 158 µm fine-structure line is the dominant cooling line of moderate-density photodissociation regions (PDRs) illuminated by moderately bright far-ultraviolet (FUV) radiation fields. This makes this line a prime diagnostic for extended regions illuminated by massive stars.
Aims: We aim to understand the origin of [C I…