Search Publications
Revisiting the pulsational characteristics of the exoplanet host star β Pictoris
Reese, D. R.; Handler, G.; Wade, G. A. +21 more
Context. Exoplanet properties crucially depend on the parameters of their host stars: more accurate stellar parameters yield more accurate exoplanet characteristics. When the exoplanet host star shows pulsations, asteroseismology can be used for an improved description of the stellar parameters.
Aims: We aim to revisit the pulsational propert…
Hidden or missing outflows in highly obscured galaxy nuclei?
Veilleux, S.; Greve, T. R.; Gallagher, J. S. +19 more
Context. Understanding the nuclear growth and feedback processes in galaxies requires investigating their often obscured central regions. One way to do this is to use (sub)millimeter line emission from vibrationally excited HCN (HCN-vib), which is thought to trace warm and highly enshrouded galaxy nuclei. It has been suggested that the most intens…
Orbital and spectral analysis of the benchmark brown dwarf HD 4747B
Rouan, D.; Ségransan, D.; D'Orazi, V. +43 more
Context. The study of high-contrast imaged brown dwarfs and exoplanets depends strongly on evolutionary models. To estimate the mass of a directly imaged substellar object, its extracted photometry or spectrum is used and adjusted with model spectra together with the estimated age of the system. These models still need to be properly tested and co…
Comparing simulated 26Al maps to gamma-ray measurements
Krumholz, Mark R.; Diehl, Roland; Greiner, Jochen +4 more
Context. The diffuse gamma-ray emission of 26Al at 1.8 MeV reflects ongoing nucleosynthesis in the Milky Way and traces massive-star feedback in the interstellar medium due to its 1 Myr radioactive lifetime. The morphology and dynamics of the interstellar medium are investigated in astrophysics through 3D hydrodynamic simulations in fin…
The Araucaria project: High-precision orbital parallax and masses of eclipsing binaries from infrared interferometry
Weber, M.; Kervella, P.; Tkachenko, A. +9 more
Context. The precise determinations of stellar mass at ≲1% provide important constraints on stellar evolution models. Accurate parallax measurements can also serve as independent benchmarks for the next Gaia data release.
Aims: We measured the masses and distance of binary systems with a precision level better than 1% using a fully geometrica…
The angular momentum of disc galaxies at z = 1
Fraternali, F.; Di Teodoro, E. M.; Oosterloo, T. +3 more
We investigate the relation between stellar mass (M⋆) and specific stellar angular momentum (j⋆), or "Fall relation", for a sample of 17 isolated, regularly rotating disc galaxies at z ∼ 1. All galaxies have rotation curves determined from Hα emission-line data; HST imaging in optical and infrared filters; and robust determin…
Multi-scale analysis of the Monoceros OB 1 star-forming region. II. Colliding filaments in the Monoceros OB1 molecular cloud
Sanhueza, Patricio; Soam, Archana; Doi, Yasuo +24 more
Context. We started a multi-scale analysis of star formation in G202.3+2.5, an intertwined filamentary sub-region of the Monoceros OB1 molecular complex, in order to provide observational constraints on current theories and models that attempt to explain star formation globally. In the first paper (Paper I), we examined the distributions of dense …
Exploring the R CrA environment with SPHERE. Discovery of a new stellar companion
Lodato, G.; Barbieri, M.; Henning, T. +39 more
Aims: R Coronae Australis (R CrA) is the brightest star of the Coronet nebula of the Corona Australis (CrA) star forming region. This star is very red in color, probably due to dust absorption, and is strongly variable. High-contrast instruments allow for an unprecedented direct exploration of the immediate circumstellar environment of this s…
A stellar census in globular clusters with MUSE: multiple populations chemistry in NGC 2808
Dreizler, S.; Bastian, N.; Latour, M. +8 more
Context. Galactic globular clusters (GCs) are now known to host multiple populations displaying particular abundance variations. The different populations within a GC can be well distinguished following their position in the pseudo two-colors diagrams, also referred to as "chromosome maps". These maps are constructed using optical and near-UV phot…
Simulating MOS science on the ELT: Lyα forest tomography
Kaper, L.; Yang, Y.; Gendron, E. +14 more
Mapping the large-scale structure through cosmic time has numerous applications in studies of cosmology and galaxy evolution. At z ≳ 2, the structure can be traced by the neutral intergalactic medium (IGM) by way of observing the Lyα forest towards densely sampled lines of sight of bright background sources, such as quasars and star-forming galaxi…