Search Publications
Additional fluorine abundance determinations in evolved stars
de Laverny, P.; Cunha, K.; Abia, C. +2 more
We present new fluorine abundance measurements for a sample of carbon-rich asymptotic giant branch (AGB) stars and two other metal-poor evolved stars of Ba/CH types. The abundances are derived from IR, K-band, high-resolution spectra obtained using GEMINI-S/Phoenix and TNG/Giano-b. Our sample includes an extragalactic AGB carbon star belonging to …
The B-Star Exoplanet Abundance Study: a co-moving 16-25 MJup companion to the young binary system HIP 79098
Reffert, Sabine; Langlois, Maud; Delorme, Philippe +13 more
Wide low-mass substellar companions are known to be very rare among low-mass stars, but appear to become increasingly common with increasing stellar mass. However, B-type stars, which are the most massive stars within 150 pc of the Sun, have not yet been examined to the same extent as AFGKM-type stars in that regard. In order to address this issue…
Dust emission profiles of DustPedia galaxies
Bianchi, S.; Fritz, J.; Madden, S. C. +19 more
Most radiative transfer models assume that dust in spiral galaxies is distributed exponentially. In this paper our goal is to verify this assumption by analysing the two-dimensional large-scale distribution of dust in galaxies from the DustPedia sample. For this purpose, we have made use of Herschel imaging in five bands, from 100 to 500 µm,…
Evolving optical polarisation of the black hole X-ray binary MAXI J1820+070
Piirola, Vilppu; Tsygankov, Sergey S.; Poutanen, Juri +8 more
Aims: The optical emission of black hole transients increases by several magnitudes during the X-ray outbursts. Whether the extra light arises from the X-ray heated outer disc, from the inner hot accretion flow, or from the jet is currently debated. Optical polarisation measurements are able to distinguish the relative contributions of these …
A joint XMM-NuSTAR observation of the galaxy cluster Abell 523: Constraints on inverse Compton emission
Brunetti, G.; Rossetti, M.; Wik, D. R. +17 more
Aims: We present the results of a joint XMM-Newton and NuSTAR observation (200 ks) of the galaxy cluster Abell 523 at z = 0.104. The peculiar morphology of the cluster radio halo and its outlier position in the radio power P(1.4 GHz) - X-ray luminosity plane make it an ideal candidate for the study of radio and X-ray correlations and for the …
CHANG-ES. XIX. Galaxy NGC 4013: a diffusion-dominated radio halo with plane-parallel disk and vertical halo magnetic fields
Weżgowiec, M.; Dettmar, R. -J.; Beck, R. +9 more
Context. The radio continuum halos of edge-on spiral galaxies have diverse morphologies, with different magnetic field properties and cosmic ray (CR) transport processes into the halo.
Aims: Using the Continuum HAloes in Nearby Galaxies - an EVLA Survey (CHANG-ES) radio continuum data from the Karl G. Jansky Very Large Array (VLA) in two freq…
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…