Search Publications
Observational evidence for buffeting-induced kink waves in solar magnetic elements
Berrilli, F.; Consolini, G.; Stangalini, M. +2 more
The role of diffuse photospheric magnetic elements in the energy budget of the upper layers of the Sun's atmosphere has been the recent subject of many studies. This was made possible by the availability of high temporal and spatial resolution observations of the solar photosphere, allowing large numbers of magnetic elements to be tracked to study…
Modelling total solar irradiance since 1878 from simulated magnetograms
Solanki, S. K.; Krivova, N. A.; Jiang, J. +1 more
Aims: We present a new model of total solar irradiance (TSI) based on magnetograms simulated with a surface flux transport model (SFTM) and the Spectral And Total Irradiance REconstructions (SATIRE) model. Our model provides daily maps of the distribution of the photospheric field and the TSI starting from 1878.
Methods: The modelling is…
B fields in OB stars (BOB): The discovery of a magnetic field in a multiple system in the Trifid nebula, one of the youngest star forming regions
Ilyin, I.; Carroll, T. A.; González, J. F. +11 more
Aims: Recent magnetic field surveys in O- and B-type stars revealed that about 10% of the core-hydrogen-burning massive stars host large-scale magnetic fields. The physical origin of these fields is highly debated. To identify and model the physical processes responsible for the generation of magnetic fields in massive stars, it is important …
Investigating the mass of the intermediate mass black hole candidate HLX-1 with the slimbh model
Godet, Olivier; Barret, Didier; Webb, Natalie +2 more
In this paper we present a comprehensive study of the mass of the intermediate mass black hole candidate HLX-1 in the galaxy ESO 243-49. We analyse the continuum X-ray spectra collected by Swift, XMM-Newton, and Chandra with the slim disc model, slimbh, and estimate the black hole mass for the full range of inclination (inc = 0°-85°) and spin (a
Herschel Planetary Nebula Survey (HerPlaNS). First detection of OH+ in planetary nebulae
Sahai, R.; Izumiura, H.; Kastner, J. H. +15 more
Aims: We report the first detections of OH+ emission in planetary nebulae (PNe).
Methods: As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the Herschel Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51µm an…
Signatures of the non-Maxwellian κ-distributions in optically thin line spectra. I. Theory and synthetic Fe IX-XIII spectra
Mason, H. E.; Del Zanna, G.; Dzifčáková, E. +1 more
Aims: We investigate the possibility of diagnosing the degree of departure from the Maxwellian distribution using single-ion spectra originating in astrophysical plasmas in collisional ionization equilibrium.
Methods: New atomic data for excitation of Fe ix - Fe xiii are integrated under the assumption of a κ-distribution of electron ene…
X-ray spectral variability of LINERs selected from the Palomar sample
González-Martín, O.; Márquez, I.; Masegosa, J. +1 more
Context. Variability is a general property of active galactic nuclei (AGN). The way in which these changes occur at X-rays is not yet clearly understood. In the particular case of low-ionization nuclear emission line region (LINER) nuclei, variations on the timescales from months to years have been found for some objects, but the main driver of th…
Large-scale environments of binary AGB stars probed by Herschel. II. Two companions interacting with the wind of π1 Gruis
Cruzalèbes, P.; Jorissen, A.; Pourbaix, D. +12 more
Context. The Mass loss of Evolved StarS (MESS) sample observed with PACS on board the Herschel Space Observatory revealed that several asymptotic giant branch (AGB) stars are surrounded by an asymmetric circumstellar envelope (CSE) whose morphology is most likely caused by the interaction with a stellar companion. The evolution of AGB stars in bin…
Searching for faint companions with VLTI/PIONIER. II. 92 main sequence stars from the Exozodi survey
Absil, O.; Augereau, J. -C.; Ertel, S. +6 more
Context. The Exozodi survey aims to determine the occurrence rate of bright exozodiacal discs around nearby main sequence stars using infrared interferometry. Although the Exozodi survey targets have been carefully selected to avoid the presence of binary stars, the results of this survey can still be biased by the presence of unidentified stellar…
GROND coverage of the main peak of gamma-ray burst 130925A
van Eerten, H.; Greiner, J.; Hurley, K. +23 more
Aims: Prompt or early optical emission in gamma-ray bursts (GRBs) is notoriously difficult to measure, and observations of the dozen cases show a large variety of properties. Yet, such early emission promises to help us achieve a better understanding of the GRB emission process(es).
Methods: We performed dedicated observations of the ult…