Search Publications
USco1621 B and USco1556 B: Two wide companions at the deuterium-burning mass limit in Upper Scorpius
Manjavacas, Elena; Rebolo, Rafael; Béjar, Víctor J. S. +6 more
Aims: Our objective is to identify analogues of gas giant planets, but located as companions at wide separations of very young stars. The main purpose is to characterise the binarity frequency and the properties of these substellar objects, and to elucidate their early evolutionary stages.
Methods: To identify these objects, we cross cor…
Kernel-phase analysis: Aperture modeling prescriptions that minimize calibration errors
Martinache, Frantz; Kammerer, Jens; N'Diaye, Mamadou +5 more
Context. Kernel phase is a data analysis method based on a generalization of the notion of closure phase, which was invented in the context of interferometry, but it applies to well corrected diffraction dominated images produced by an arbitrary aperture. The linear model upon which it relies theoretically leads to the formation of observable quan…
Structural analysis of massive galaxies using HST deep imaging at z < 0.5
Lorenzoni, Silvio; Buitrago, Fernando; Matute, Israel +11 more
Context. The most massive galaxies (Mstellar ≥ 1011 M⊙) in the local Universe are characterized by a bulge-dominated morphology and old stellar populations, in addition to being confined to a tight mass-size relation. Identifying their main components can provide insights into their formation mechanisms and subsequ…
Sunspot penumbral filaments intruding into a light bridge and the resultant reconnection jets
Zhang, J.; Hou, Y. J.; Li, T. +5 more
Context. Penumbral filaments and light bridges are prominent structures inside sunspots and are important for understanding the nature of sunspot magnetic fields and magneto-convection underneath.
Aims: We investigate an interesting event where several penumbral filaments intrude into a sunspot light bridge. In doing so we aim to gain further…
The ALMA Frontier Fields Survey. V. ALMA Stacking of Lyman-Break Galaxies in Abell 2744, Abell 370, Abell S1063, MACSJ0416.1-2403 and MACSJ1149.5+2223
Kneissl, R.; Demarco, R.; Treister, E. +15 more
Context. The Hubble Frontier Fields offer an exceptionally deep window into the high-redshift universe, covering a substantially larger area than the Hubble Ultra-Deep field at low magnification and probing 1-2 mag deeper in exceptional high-magnification regions. This unique parameter space, coupled with the exceptional multi-wavelength ancillary…
The strange case of the peculiar spiral galaxy NGC 5474. New pieces of a galactic puzzle
Cignoni, M.; Tosi, M.; Bellazzini, M. +5 more
We present the first analysis of the stellar content of the structures and substructures identified in the peculiar star-forming galaxy NGC 5474, based on Hubble Space Telescope resolved photometry from the LEGUS survey. NGC 5474 is a satellite of the giant spiral M 101, and it is known to have a prominent bulge that is significantly off-set from …
Interstellar anatomy of the TeV gamma-ray peak in the IC443 supernova remnant
Marcowith, A.; Gerin, M.; Güsten, R. +11 more
Context. Supernova remnants (SNRs) represent a major feedback source from stars in the interstellar medium of galaxies. During the latest stage of supernova explosions, shock waves produced by the initial blast modify the chemistry of gas and dust, inject kinetic energy into the surroundings, and may alter star formation characteristics. Simultane…
Non-local thermodynamic equilibrium transmission spectrum modelling of HD 209458b
Salz, M.; France, K.; Fossati, L. +3 more
Context. Exoplanetary upper atmospheres are low density environments where radiative processes can compete with collisional ones and introduce non-local thermodynamic equilibrium (NLTE) effects into transmission spectra.
Aims: We develop a NLTE radiative transfer framework capable of modelling exoplanetary transmission spectra over a wide ran…
Electron acceleration and radio emission following the early interaction of two coronal mass ejections
Palmerio, E.; Magdalenić, J.; Kilpua, E. K. J. +6 more
Context. Coronal mass ejections (CMEs) are large eruptions of magnetised plasma from the Sun that are often accompanied by solar radio bursts produced by accelerated electrons.
Aims: A powerful source for accelerating electron beams are CME-driven shocks, however, there are other mechanisms capable of accelerating electrons during a CME erupt…
The path to Z And-type outbursts: The case of V426 Sagittae (HBHA 1704-05)
Masetti, N.; Munari, U.; Buil, C. +16 more
Context. The star V426 Sge (HBHA 1704-05), originally classified as an emission-line object and a semi-regular variable, brightened at the beginning of August 2018, showing signatures of a symbiotic star outburst.
Aims: We aim to confirm the nature of V426 Sge as a classical symbiotic star, determine the photometric ephemeris of the light min…