Search Publications
The observed multiplicity properties of B-type stars in the Galactic young open cluster NGC 6231
Evans, C. J.; Sana, H.; Mahy, L. +3 more
Context. It is well known that massive O stars are frequently (if not always) found in binary or higher-order multiple systems, but this fact has been less robustly investigated for the lower mass range of the massive stars, represented by B-type stars. Obtaining the binary fraction and orbital parameter distributions of B-type stars is crucial to…
Identifying quiescent compact objects in massive Galactic single-lined spectroscopic binaries
Shenar, T.; Sana, H.; Hawcroft, C. +13 more
Context. The quest to detect dormant stellar-mass black holes (BHs) in massive binaries (i.e. OB+BH systems) is challenging; only a few candidates have been claimed to date, all of which must still be confirmed.
Aims: To search for these rare objects, we study 32 Galactic O-type stars that were reported as single-lined spectroscopic binaries …
KiDS and Euclid: Cosmological implications of a pseudo angular power spectrum analysis of KiDS-1000 cosmic shear tomography
Cimatti, A.; Douspis, M.; Dupac, X. +111 more
We present a tomographic weak lensing analysis of the Kilo Degree Survey Data Release 4 (KiDS-1000), using a new pseudo angular power spectrum estimator (pseudo-Cℓ) under development for the ESA Euclid mission. Over 21 million galaxies with shape information are divided into five tomographic redshift bins, ranging from 0.1 to 1.2 in pho…
The European Solar Telescope
Heinzel, P.; Strassmeier, K. G.; Schmidt, W. +278 more
The European Solar Telescope (EST) is a project aimed at studying the magnetic connectivity of the solar atmosphere, from the deep photosphere to the upper chromosphere. Its design combines the knowledge and expertise gathered by the European solar physics community during the construction and operation of state-of-the-art solar telescopes operati…
The protoplanetary disk population in the ρ-Ophiuchi region L1688 and the time evolution of Class II YSOs
Lodato, G.; Pascucci, I.; Testi, L. +10 more
Context. Planets form during the first few Myr of the evolution of the star-disk system, possibly before the end of the embedded phase. The properties of very young disks and their subsequent evolution reflect the presence and properties of their planetary content.
Aims: We present a study of the Class II/F disk population in L1688, the dense…
MeerKAT view of the diffuse radio sources in Abell 3667 and their interactions with the thermal plasma
Finoguenov, A.; Brüggen, M.; de Gasperin, F. +11 more
Context. During their lifetimes, galaxy clusters grow through the accretion of matter from the filaments of the large-scale structure and from mergers with other clusters. These mergers release a large amount of energy into the intracluster medium (ICM) through merger shocks and turbulence. These phenomena are associated with the formation of radi…
Hα and He I absorption in HAT-P-32 b observed with CARMENES. Detection of Roche lobe overflow and mass loss
Schmitt, J. H. M. M.; López-Puertas, M.; Nagel, E. +22 more
We analyze two high-resolution spectral transit time series of the hot Jupiter HAT-P-32 b obtained with the CARMENES spectrograph. Our new XMM-Newton X-ray observations of the system show that the fast-rotating F-type host star exhibits a high X-ray luminosity of 2.3 × 1029 erg s−1 (5-100 Å), corresponding to a flux of 6.9 × …
New limits from microlensing on Galactic black holes in the mass range 10 M⊙ < M < 1000 M⊙
Perdereau, O.; Aubourg, E.; Goldman, B. +17 more
We searched for long-duration microlensing events originating from intermediate-mass black holes (BH) in the halo of the Milky Way, using archival data from the EROS-2 and MACHO photometric surveys towards the Large Magellanic Cloud (LMC). We combined data from these two surveys to create a common database of light curves for 14.1 million objects …
Asteroid taxonomy from cluster analysis of spectrometry and albedo
Carry, B.; Mahlke, M.; Mattei, P. -A.
Context. The classification of the minor bodies of the Solar System based on observables has been continuously developed and iterated over the past 40 yr. While prior iterations followed either the availability of large observational campaigns or new instrumental capabilities opening new observational dimensions, we see the opportunity to improve …
A major asymmetric ice trap in a planet-forming disk. III. First detection of dimethyl ether
Booth, Alice S.; van Dishoeck, Ewine F.; Nazari, Pooneh +3 more
The complex organic molecules (COMs) detected in star-forming regions are the precursors of the prebiotic molecules that can lead to the emergence of life. By studying COMs in more evolved protoplanetary disks we can gain a better understanding of how they are incorporated into planets. This paper presents ALMA band 7 observations of the dust and …