Search Publications
The evolution of coronal mass ejections in the inner heliosphere: Implementing the spheromak model with EUHFORIA
Poedts, S.; Verbeke, C.; Pomoell, J.
Aims: We introduce a new model for coronal mass ejections (CMEs) that has been implemented in the magnetohydrodynamics (MHD) inner heliosphere model EUHFORIA. Utilising a linear force-free spheromak (LFFS) solution, the model provides an intrinsic magnetic field structure for the CME. As a result, the new model has the potential to predict th…
Drifting of the line-tied footpoints of CME flux-ropes
Aulanier, Guillaume; Dudík, Jaroslav
Context. Bridging the gap between heliospheric and solar observations of eruptions requires the mapping of interplanetary coronal mass ejection (CME) footpoints down to the Sun's surface. But this not straightforward. Improving the understanding of the spatio-temporal evolutions of eruptive flares requires a comprehensive standard model. But the c…
VLT/SPHERE exploration of the young multiplanetary system PDS70
Rouan, D.; Pinte, C.; Henning, T. +51 more
Context. PDS 70 is a young (5.4 Myr), nearby ( 113 pc) star hosting a known transition disk with a large gap. Recent observations with SPHERE and NACO in the near-infrared (NIR) allowed us to detect a planetary mass companion, PDS 70 b, within the disk cavity. Moreover, observations in Hα with MagAO and MUSE revealed emission associated…
The dwarf galaxy satellite system of Centaurus A
Müller, Oliver; Jerjen, Helmut; Lelli, Federico +4 more
Dwarf galaxy satellite systems are essential probes to test models of structure formation, making it necessary to establish a census of dwarf galaxies outside of our own Local Group. We present deep FORS2 VI band images from the ESO Very Large Telescope (VLT) for 15 dwarf galaxy candidates in the Centaurus group of galaxies. We confirm nine dwarfs…
Using Herschel and Planck observations to delineate the role of magnetic fields in molecular cloud structure
Soler, Juan D.
We present a study of the relative orientation between the magnetic field projected onto the plane of sky (B⊥) on scales down to 0.4 pc, inferred from the polarized thermal emission of Galactic dust observed by Planck at 353 GHz, and the distribution of gas column density (NH) structures on scales down to 0.026 pc, derived fr…
The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy. II. Simultaneous multiwavelength range modeling of activity insensitive lines
Schmitt, J. H. M. M.; Nagel, E.; Amado, P. J. +25 more
We present precise photospheric parameters of 282 M dwarfs determined from fitting the most recent version of PHOENIX models to high-resolution CARMENES spectra in the visible (0.52-0.96 µm) and NIR wavelength range (0.96-1.71 µm). With its aim to search for habitable planets around M dwarfs, several planets of different masses have be…
The ultra-diffuse galaxy NGC 1052-DF2 with MUSE. II. The population of DF2: stars, clusters, and planetary nebulae
Emsellem, Eric; Müller, Oliver; Peng, Eric W. +13 more
NGC 1052-DF2, an ultra-diffuse galaxy (UDG), has been the subject of intense debate. Its alleged absence of dark matter, and the brightness and number excess of its globular clusters (GCs) at an initially assumed distance of 20 Mpc suggest a new formation channel for UDGs. We present the first systematic spectroscopic analysis of the stellar body …
Open clusters in APOGEE and GALAH. Combining Gaia and ground-based spectroscopic surveys
Jordi, C.; Casamiquela, L.; Cantat-Gaudin, T. +7 more
Context. Open clusters are ideal laboratories to investigate a variety of astrophysical topics, from the properties of the Galactic disc to stellar-evolution models. Knowing their metallicity and possibly detailed chemical abundances is therefore important. However, the number of systems with chemical abundances determined from high-resolution spe…
Exoplanet atmospheres with GIANO. II. Detection of molecular absorption in the dayside spectrum of HD 102195b
Sozzetti, A.; Giacobbe, P.; Bonomo, A. S. +4 more
Context. The study of exoplanetary atmospheres is key to understanding the differences between their physical, chemical, and dynamical processes. Until now, the bulk of atmospheric characterization analyses have been conducted on transiting planets. On a number of sufficiently bright targets, high-resolution spectroscopy (HRS) has also been succes…
A 5D view of the α Per, Pleiades, and Praesepe clusters
Smart, R. L.; Lodieu, N.; Pérez-Garrido, A. +1 more
Aims: Our scientific goal is to provide revised membership lists of the α Per, Pleiades, and Praesepe clusters exploiting the second data release of Gaia and produce five-dimensional maps (α, δ, π, µα cos δ, µδ) of these clusters.
Methods: We implemented the kinematic method combined with the statistical…