Search Publications
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…
TOI-1268b: The youngest hot Saturn-mass transiting exoplanet
Fridlund, M.; Pallé, E.; Guenther, E. W. +41 more
We report the discovery of TOI-1268b, a transiting Saturn-mass planet from the TESS space mission. With an age of less than 1 Gyr, derived from various age indicators, TOI-1268b is the youngest Saturn-mass planet known to date; it contributes to the small sample of well-characterised young planets. It has an orbital period of P = 8.1577080 ± 0.000…
Microlensing and the type Ia supernova iPTF16geu
Diego, J. M.; Goobar, A.; Mörtsell, E. +5 more
The observed magnifications and light curves of the quadruply imaged iPTF16geu supernova (SN) offers a unique opportunity to study a lens system with a variety of independent constraints. The four observed positions can be used to constrain the macrolens model. The magnifications and light curves at the four SN positions are more useful to constra…
In-depth direct imaging and spectroscopic characterization of the young Solar System analog HD 95086
Rouan, D.; Ménard, F.; Henning, T. +48 more
Context. HD 95086 is a young nearby Solar System analog hosting a giant exoplanet orbiting at 57 au from the star between an inner and outer debris belt. The existence of additional planets has been suggested as the mechanism that maintains the broad cavity between the two belts.
Aims: We present a dedicated monitoring of HD 95086 with the VL…
Structure and evolution of ultra-massive white dwarfs in general relativity
Córsico, Alejandro H.; Rebassa-Mansergas, Alberto; Althaus, Leandro G. +4 more
Context. Ultra-massive white dwarfs (M⋆ ≳ 1.05 M⊙) are of utmost importance in view of the role they play in type Ia supernovae explosions, merger events, the existence of high-magnetic -field white dwarfs, and the physical processes in the super asymptotic giant branch phase.
Aims: We aim to present the first set of con…
No correlation of the Lyman continuum escape fraction with spectral hardness
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +25 more
The properties that govern the production and escape of hydrogen-ionizing photons (Lyman continuum, LyC; with energies > 13.6 eV) in star-forming galaxies are still poorly understood, but they are key to identifying and characterizing the sources that reionized the Universe. Here we empirically explore the relation between the hardness of ioniz…
Inspection of 19 globular cluster candidates in the Galactic bulge with the VVV survey
Minniti, D.; Ripepi, V.; Fernández-Trincado, J. G. +4 more
Context. The census of the globular clusters (GCs) in the Milky Way is still a work in progress. The advent of new deep surveys has made it possible to discover many new star clusters both in the Galactic disk and bulge, but many of these new candidates have not yet been studied in detail, leaving a veil on their true physical nature.
Aims: W…