Search Publications
3D chemical structure of diffuse turbulent ISM. I. Statistics of the HI-to-H2 transition
Godard, B.; Pérault, M.; Hennebelle, P. +4 more
Context. The amount of data collected by spectrometers from radio to ultraviolet (UV) wavelengths opens a new era where the statistical and chemical information contained in the observations can be used concomitantly to investigate the thermodynamical state and the evolution of the interstellar medium (ISM).
Aims: In this paper, we study the …
HST/STIS transmission spectrum of the ultra-hot Jupiter WASP-76 b confirms the presence of sodium in its atmosphere
Mallonn, M.; Kjeldsen, H.; von Essen, C. +4 more
We present an atmospheric transmission spectrum of the ultra-hot Jupiter WASP-76 b by analyzing archival data obtained with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). The dataset spans three transits, two with a wavelength coverage between 2900 and 5700 Å, and the third one between 5250 and 10 300 Å.…
Formation channels of slowly rotating early-type galaxies
Krajnović, Davor; Emsellem, Eric; Cappellari, Michele +11 more
We study the evidence for a diversity of formation processes in early-type galaxies by presenting the first complete volume-limited sample of slow rotators with both integral-field kinematics from the ATLAS3D Project and high spatial resolution photometry from the Hubble Space Telescope. Analysing the nuclear surface brightness profiles…
Probing the magnetospheric accretion region of the young pre-transitional disk system DoAr 44 using VLTI/GRAVITY
Dougados, C.; Bouvier, J.; Brandner, W. +6 more
Context. Young stellar objects are thought to accrete material from their circumstellar disks through their strong stellar magnetospheres.
Aims: We aim to directly probe the magnetospheric accretion region on a scale of a few 0.01 au in a young stellar system using long-baseline optical interferometry.
Methods: We observed the pre-transi…
Temperature profiles of young disk-like structures. The case of IRAS 16293A
van Dishoeck, Ewine F.; Jørgensen, Jes K.; van 't Hoff, Merel L. R. +1 more
Context. Temperature is a crucial parameter in circumstellar disk evolution and planet formation because it governs the resistance of the gas to gravitational instability and sets the chemical composition of the planet-forming material.
Aims: We set out to determine the gas temperature of the young disk-like structure around the Class 0 proto…
Aluminium-enriched metal-poor stars buried in the inner Galaxy
Beers, Timothy C.; Minniti, Dante; Geisler, Doug +5 more
Stars with higher levels of aluminium and nitrogen enrichment are often key pieces in the chemical makeup of multiple populations in almost all globular clusters (GCs). There is also compelling observational evidence that some Galactic components could be partially built from dissipated GCs. The identification of such stars among metal-poor field …
A plethora of new, magnetic chemically peculiar stars from LAMOST DR4
Paunzen, E.; Bernhard, K.; Hümmerich, S.
Context. Magnetic chemically peculiar (mCP) stars are important to astrophysics because their complex atmospheres lend themselves perfectly to the investigation of the interplay between such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotation. The most up-to-date catalogue of these objects was published a decade ago. Since…
The stellar and wind parameters of six prototypical HMXBs and their evolutionary status
Hamann, W. -R.; Oskinova, L. M.; Sander, A. A. C. +7 more
Context. High-mass X-ray binaries (HMXBs) are exceptional astrophysical laboratories that offer a rare glimpse into the physical processes that govern accretion on compact objects, massive-star winds, and stellar evolution. In a subset of the HMXBs, the compact objects accrete matter solely from winds of massive donor stars. These so-called wind-f…
ALMA resolves the remarkable molecular jet and rotating wind in the extremely radio-quiet galaxy NGC 1377
Gallagher, J. S.; van der Werf, P.; Combes, F. +14 more
Submillimetre and millimetre line and continuum observations are important in probing the morphology, column density, and dynamics of the molecular gas and dust around obscured active galactic nuclei (AGNs) and their mechanical feedback. With very high-resolution (0.″02 × 0.″03 (2 × 3 pc)) ALMA 345 GHz observations of CO 3-2, HCO+ 4-3, …
Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating Be star HD49330
Neiner, C.; Lee, U.; Mathis, S. +3 more
Context. HD 49330 is an early Be star that underwent an outburst during its five-month observation with the CoRoT satellite. An analysis of its light curve revealed several independent p and g pulsation modes, in addition to showing that the amplitude of the modes is directly correlated with the outburst.
Aims: We modelled the results obtaine…