Search Publications
Validation scheme for solar coronal models: Constraints from multi-perspective observations in EUV and white light
Temmer, M.; Asvestari, E.; Pomoell, J. +2 more
Context. In this paper, we present a validation scheme to investigate the quality of coronal magnetic field models, which is based on comparisons with observational data from multiple sources.
Aims: Many of these coronal models may use a range of initial parameters that produce a large number of physically reasonable field configurations. How…
X-ray variability of HD 189733 across eight years of XMM-Newton observations
Micela, G.; Sciortino, S.; Pillitteri, I. +2 more
The characterization of exoplanets, their formation, evolution, and chemical changes is tightly linked to our knowledge of their host stars. In particular, stellar X-rays and UV emission have a strong impact on the dynamical and chemical evolution of planetary atmospheres. We analyzed 25 XMM-Newton observations encompassing about eight years and t…
The role of highly vibrationally excited H2 initiating the nitrogen chemistry. Quantum study and 3σ detection of NH emission in the Orion Bar PDR
Goicoechea, Javier R.; Roncero, Octavio
The formation of hydrides by gas-phase reactions between H2 and a heavy element atom is a very selective process. Reactions with ground-state neutral carbon, oxygen, nitrogen, and sulfur atoms are very endoergic and have high energy barriers because the H2 molecule has to be fragmented before a hydride bond is formed. In cold…
Measuring chemical abundances in AGN from infrared nebular lines: HII-CHI-MISTRY-IR for AGN
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +1 more
Context. Future and ongoing infrared and radio observatories such as JWST, METIS, and ALMA will increase the amount of rest-frame IR spectroscopic data for galaxies by several orders of magnitude. While studies of the chemical composition of the interstellar medium (ISM) based on optical observations have been widely spread over decades for star-f…
Physical properties of the trans-Neptunian object (38628) Huya from a multi-chord stellar occultation
Ofek, E.; Marques Oliveira, J.; Sicardy, B. +85 more
Context. As part of our international program aimed at obtaining accurate physical properties of trans-Neptunian objects (TNOs), we predicted a stellar occultation by the TNO (38628) Huya of the star Gaia DR2 4352760586390566400 (mG = 11.5 mag) on March 18, 2019. After an extensive observational campaign geared at obtaining the astromet…
CAPOS: The bulge Cluster APOgee Survey. III. Spectroscopic tomography of Tonantzintla 2
Cohen, Roger E.; Beers, Timothy C.; Minniti, Dante +10 more
We performed the first detailed spectral analysis of red giant members of the relatively high-metallicity globular cluster (GC) Tononzintla 2 (Ton 2) using high-resolution near-infrared spectra collected with the Apache Point Observatory Galactic Evolution Experiment II survey (APOGEE-2), obtained as part of the bulge Cluster APOgee Survey. We inv…
A multiwavelength study of the W33 Main ultracompact HII region
Menten, K. M.; Khan, S.; Wyrowski, F. +7 more
Aims: The dynamics of ionized gas around the W33 Main ultracompact HII region is studied using observations of hydrogen radio recombination lines and a detailed multiwavelength characterization of the massive star-forming region W33 Main is performed.
Methods: We used the Giant Meterwave Radio Telescope (GMRT) to observe the H167α recomb…
Tracking the 3D evolution of a halo coronal mass ejection using the revised cone model
Zhang, Q. M.
Aims: This paper aims to track the three-dimensional (3D) evolution of a full halo coronal mass ejection (CME) on 2011 June 21.
Methods: The CME results from a nonradial eruption of a filament-carrying flux rope in NOAA active region 11236. The eruption was observed in extreme-ultraviolet (EUV) wavelengths by the extreme-ultraviolet imag…
Kepler-93: A testbed for detailed seismic modelling and orbital evolution of super-Earths around solar-like stars
Bétrisey, J.; Buldgen, G.; Khan, S. +4 more
Context. The advent of space-based photometry missions such as CoRoT, Kepler and TESS has sparkled the rapid development of asteroseismology and its synergies with exoplanetology. In the near future, the advent of PLATO will further strengthen such multi-disciplinary studies. In that respect, testing asteroseismic modelling strategies and their im…
The interstellar medium of high-redshift galaxies: Gathering clues from C III] and [C II] lines
Maiolino, R.; Pentericci, L.; Ferrara, A. +5 more
Context. A tight relation between [C II] 158 µm line luminosity and the star formation rate (SFR) has been observed for local galaxies. At high redshift (z > 5), galaxies instead deviate downwards from the local Σ[C II] − ΣSFR relation. This deviation might be caused by different interstellar medium (ISM) properties …