Search Publications
Measuring chemical abundances with infrared nebular lines: HII-CHI-MISTRY-IR
Spinoglio, L.; Amorín, R.; Pérez-Montero, E. +2 more
We provide a new method for deriving heavy element abundances taking advantage of the unique suite of fine-structure lines in the mid- to far-infrared (IR) range. Using grids of photo-ionisation models that cover a wide range in O/H and N/O abundances and ionisation parameter, our code HII-CHI-MISTRY-IR (HCM-IR) provides model-based abundances bas…
The AMBRE Project: Origin and evolution of sulfur in the Milky Way
Recio-Blanco, A.; de Laverny, P.; Álvarez, M. A. +4 more
Context. Sulfur is a volatile chemical element that plays an important role in tracing the chemical evolution of the Milky Way and external galaxies. However, its nucleosynthesis origin and abundance variations in the Galaxy are still unclear because the number of available stellar sulfur abundance measurements is currently rather small.
Aims…
Activity of TRAPPIST-1 analog stars observed with TESS
Pál, András; Moór, Attila; Vida, Krisztián +2 more
As more exoplanets are being discovered around ultracool dwarfs, understanding their magnetic activity and the implications for habitability is of prime importance. To find stellar flares and photometric signatures related to starspots, continuous monitoring is necessary, which can be achieved with spaceborne observatories such as the Transiting E…
The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia's astrometric sample
Anders, F.; Antoja, T.; Ramos, P. +5 more
Context. The Gaia astrometric sample allows us to study the outermost Galactic disc, the halo, and their interface. It is precisely at the very edge of the disc where the effects of external perturbations are expected to be the most noticeable.
Aims: Our goal is to detect the kinematic substructure present in the halo and at the edge of the M…
Confirmation of two new Galactic bulge globular clusters: FSR 19 and FSR 25
Minniti, D.; Alonso-García, J.; Gómez, M. +1 more
Context. Globular clusters (GCs) in the Milky Way (MW) bulge are very difficult to study for the following reasons: (i) they suffer from the severe crowding and Galactic extinction, which are characteristic of these inner Galactic regions; (ii) they are more prone to the effects of dynamical processes. Therefore, they are relatively faint and diff…
Mars moon ephemerides after 14 years of Mars Express data
Jaumann, R.; Oberst, J.; Rosenblatt, P. +7 more
The Mars Express (MEX) mission has been successfully operated around Mars since 2004. Among many results, MEX has provided some of the most accurate astrometric data of the two Mars moons, Phobos and Deimos. We present new ephemerides of the Mars moons benefitting from all previously published astrometric data to the most recent MEX SRC data. Obse…
Quantitative inference of the H2 column densities from 3 mm molecular emission: case study towards Orion B
Peretto, Nicolas; Hughes, Annie; Kainulainen, Jouni +21 more
Context. Based on the finding that molecular hydrogen is unobservable in cold molecular clouds, the column density measurements of molecular gas currently rely either on dust emission observation in the far-infrared, which requires space telescopes, or on star counting, which is limited in angular resolution by the stellar density. The (sub)millim…
Comparative high-resolution spectroscopy of M dwarfs: Exploring non-LTE effects
Heiter, U.; Kochukhov, O.; Olander, T.
Context. M dwarfs are key targets for high-resolution spectroscopy and model atmosphere analyses because of the high incidence of these stars in the solar neighbourhood and their importance as exoplanetary hosts. Several methodological challenges make such analyses difficult, leading to significant discrepancies in the published results.
Aims…
Black hole feeding and star formation in NGC 1808
Krips, M.; van der Werf, P.; Combes, F. +11 more
We report on Atacama Large Millimeter Array (ALMA) observations of CO(3−2) emission in the Seyfert2/starburst galaxy NGC 1808, at a spatial resolution of 4 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central 0.5 kpc and to probe the nuclear feeding and feedback phenomena. We discovered a nuclear spiral of radius…
Cyanogen, cyanoacetylene, and acetonitrile in comet 67P and their relation to the cyano radical
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +6 more
The cyano radical (CN) is one of the most frequently remotely observed species in space, and is also often observed in comets. Data for the inner coma of comet 67P/Churyumov-Gerasimenko collected by the high-resolution Double Focusing Mass Spectrometer (DFMS) on board the Rosetta orbiter revealed an unexpected chemical complexity, and, recently, a…