Search Publications
Stellar population of the superbubble N 206 in the LMC. I. Analysis of the Of-type stars
Hamann, W. -R.; Gallagher, J. S.; Oskinova, L. M. +5 more
Context. Massive stars severely influence their environment by their strong ionizing radiation and by the momentum and kinetic energy input provided by their stellar winds and supernovae. Quantitative analyses of massive stars are required to understand how their feedback creates and shapes large scale structures of the interstellar medium. The gi…
Mass determination of the 1:3:5 near-resonant planets transiting GJ 9827 (K2-135)
Alonso, R.; Deeg, H.; Erikson, A. +40 more
Context. Multiplanet systems are excellent laboratories to test planet formation models as all planets are formed under the same initial conditions. In this context, systems transiting bright stars can play a key role, since planetary masses, radii, and bulk densities can be measured.
Aims: GJ 9827 (K2-135) has recently been found to host a t…
The ALMA Frontier Fields Survey. IV. Lensing-corrected 1.1 mm number counts in Abell 2744, MACS J0416.1-2403 and MACS J1149.5+2223
Kneissl, R.; Demarco, R.; Laporte, N. +15 more
Context. Characterizing the number counts of faint (i.e., sub-mJy and especially sub-100 µJy), dusty star-forming galaxies is currently a challenge even for deep, high-resolution observations in the FIR-to-mm regime. They are predicted to account for approximately half of the total extragalactic background light at those wavelengths. Searchi…
Light variations due to the line-driven wind instability and wind blanketing in O stars
Krtička, J.; Feldmeier, A.
A small fraction of the radiative flux emitted by hot stars is absorbed by their winds and redistributed towards longer wavelengths. This effect, which leads also to the heating of the stellar photosphere, is termed wind blanketing. For stars with variable winds, the effect of wind blanketing may lead to the photometric variability. We have studie…
Dust spectrum and polarisation at 850 µm in the massive IRDC G035.39-00.33
Sanhueza, Patricio; Kwon, Woojin; Soam, Archana +18 more
Context. The sub-millimetre polarisation of dust emission from star-forming clouds carries information on grain properties and on the effects that magnetic fields have on cloud evolution.
Aims: Using observations of a dense filamentary cloud G035.39-00.33, we aim to characterise the dust emission properties and the variations of the polarisat…
First observations of magnetic holes deep within the coma of a comet
Behar, E.; Möstl, C.; Eriksson, A. +6 more
The Rosetta spacecraft of the European Space Agency made ground-breaking observations of comet 67P/Churyumov-Gerasimenko and of its cometary environment. We search for magnetic holes in that environment, i.e., significant depressions in the magnetic field strength, measured by the Rosetta fluxgate Magnetometer (MAG) in April and May 2015. In that …
Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
Nuñez, N. E.; Nelson, T.; Mukai, K. +6 more
A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in the symbiotic recurrent nova T CrB. Our analysis of XMM-Newton, Swift Burst Alert Telescope (BAT)/X-Ray Telescope (XRT)/UltraViol…
Chandra and ALMA observations of the nuclear activity in two strongly lensed star-forming galaxies
Danese, L.; Massardi, M.; Enia, A. F. M. +7 more
Aim. According to coevolutionary scenarios, nuclear activity and star formation play relevant roles in the early stages of galaxy formation. We aim at identifying them in high-redshift galaxies by exploiting high-resolution and high-sensitivity X-ray and millimeter-wavelength data to confirm the presence or absence of star formation and nuclear ac…
Updated astrometry and masses of the LUH 16 brown dwarf binary
Sahlmann, J.; Lazorenko, P. F.
The nearest known binary brown dwarf WISE J104915.57-531906.1AB (LUH 16) is a well-studied benchmark for our understanding of substellar objects. Previously published astrometry of LUH 16 obtained with FORS2 on the Very Large Telescope was affected by errors that limited its use in combination with other datasets, thereby hampering the determinati…
Global hot-star wind models for stars from Magellanic Clouds
Krtička, J.; Kubát, J.
We provide mass-loss rate predictions for O stars from Large and Small Magellanic Clouds. We calculate global (unified, hydrodynamic) model atmospheres of main sequence, giant, and supergiant stars for chemical composition corresponding to Magellanic Clouds. The models solve radiative transfer equation in comoving frame, kinetic equilibrium equati…