Search Publications
ALMA and MUSE observations reveal a quiescent multi-phase circumgalactic medium around the z ≃ 3.6 radio galaxy 4C 19.71
Lehnert, Matthew D.; De Breuck, Carlos; Vernet, Joël +2 more
We present MUSE at VLT imaging spectroscopy of rest-frame ultraviolet emission lines and ALMA observations of the [C I] 3P1-3P0 emission line, probing both the ionized and diffuse molecular medium around the radio galaxy 4C 19.71 at z ≃ 3.6. This radio galaxy has extended Lyα emission over a region ∼100 …
The first interferometric survey of massive YSOs in the K-band. Hot dust, ionised gas, and binarity at au scales
Mendigutía, I.; Stecklum, B.; de Wit, W. -J. +8 more
Context. Circumstellar discs are essential for the formation of high mass stars, while multiplicity, and in particular binarity, appears to be an inevitable outcome, as the vast majority of massive stars (>8 M⊙) are found in binaries (up to 100%). Our understanding of the innermost regions of accretion discs around massive stars and …
Timing argument take on the Milky Way and Andromeda past encounter
Benisty, David
The two-body problem of the M 31 and Milky Way (MW) galaxies with a cosmological constant background is studied, with an emphasis on the possibility that they experienced a past encounter (PE). Past encounters are possible only for a nonzero transverse velocity, and their viability is subject to observations of the imprints of such near collisions…
A SOPHIE RV search for giant planets around young nearby stars (YNS). A combination with the HARPS YNS survey
Meunier, N.; Messina, S.; Lagrange, A. -M. +9 more
Context. The search of close (a ≲ 5 au) giant planet (GP) companions with radial velocity (RV) around young stars and the estimate of their occurrence rates is important to constrain the migration timescales. Furthermore, this search will allow the giant planet occurrence rates to be computed at all separations via the combination with direct imag…
ATOMIUM: halide molecules around the S-type AGB star W Aquilae
Waters, L. B. F. M.; Menten, K. M.; Sahai, R. +36 more
Context. S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate but have not been studied in as much detail as their carbon- and oxygen-rich counterparts. W Aql is a nearby S-type star, with wel…
Modeling the nonaxisymmetric structure in the HD 163296 disk with planet-disk interaction
Dullemond, C. P.; Kley, W.; Weber, P. +2 more
Context. High-resolution ALMA observations such as the DSHARP campaign have revealed a variety of rich substructures in numerous protoplanetary disks. These structures consist of rings, gaps, and asymmetric features. It has been debated whether planets can be accounted for among these substructures in the dust continuum. Characterizing the origin …
Cosmology with the submillimetre galaxies magnification bias. Tomographic analysis
Bonavera, L.; González-Nuevo, J.; Migliaccio, M. +5 more
Context. High-z submillimetre galaxies can be used as a background sample for gravitational lensing studies thanks to their magnification bias. In particular, the magnification bias can be exploited in order to constrain the free parameters of a halo occupation distribution (HOD) model and some of the main cosmological parameters. A pseudo-tomogra…
EC 22536−5304: a lead-rich and metal-poor long-period binary
Heber, U.; Irrgang, A.; Dorsch, M. +2 more
Helium-burning hot subdwarf stars of spectral types O and B (sdO/B) are thought to be produced through various types of binary interactions. The helium-rich hot subdwarf star EC 22536−5304 was recently found to be extremely enriched in lead. Here, we show that EC 22536−5304 is a binary star with a metal-poor subdwarf F-type (sdF) companion. We per…
Evidence for chromium hydride in the atmosphere of hot Jupiter WASP-31b
Chubb, Katy L.; Braam, Marrick; van der Tak, Floris F. S. +1 more
Context. The characterisation of exoplanet atmospheres has shown a wide diversity of compositions. Hot Jupiters have the appropriate temperatures to host metallic compounds, which should be detectable through transmission spectroscopy.
Aims: We aim to detect exotic species in the transmission spectra of hot Jupiters, specifically WASP-31b, by…
PENELLOPE. II. CVSO 104: A pre-main sequence close binary with an optical companion in Ori OB1
Ábrahám, P.; Kóspál, Á.; Siwak, M. +14 more
We present the results of our study of the close pre-main sequence spectroscopic binary CVSO 104 in Ori OB1, based on data obtained within the PENELLOPE legacy program. We derive, for the first time, the orbital elements of the system and the stellar parameters of the two components. The system is composed of two early M-type stars and has an orbi…