Search Publications
Characterizing the properties of nearby molecular filaments observed with Herschel
André, Ph.; Arzoumanian, D.; Könyves, V. +8 more
Context. Molecular filaments have received special attention recently thanks to new observational results on their properties. In particular, our early analysis of filament properties from Herschel imaging data in three nearby molecular clouds revealed a narrow distribution of median inner widths centered at a characteristic value of about 0.1 pc.…
The CARMENES search for exoplanets around M dwarfs. Different roads to radii and masses of the target stars
Schmitt, J. H. M. M.; del Burgo, C.; Amado, P. J. +28 more
Aims: We determine the radii and masses of 293 nearby, bright M dwarfs of the CARMENES survey. This is the first time that such a large and homogeneous high-resolution (R > 80 000) spectroscopic survey has been used to derive these fundamental stellar parameters.
Methods: We derived the radii using Stefan-Boltzmann's law. We obtained …
A stellar census in globular clusters with MUSE: Binaries in NGC 3201
Brinchmann, Jarle; Weilbacher, Peter M.; Kamann, Sebastian +8 more
We utilise multi-epoch MUSE spectroscopy to study binary stars in the core of the Galactic globular cluster NGC 3201. Our sample consists of 3553 stars with 54 883 spectra in total comprising 3200 main-sequence stars up to 4 magnitudes below the turn-off. Each star in our sample has between 3 and 63 (with a median of 14) reliable radial velocity m…
Non-thermal pressure support in X-COP galaxy clusters
Pointecouteau, E.; Rossetti, M.; Rasia, E. +13 more
Galaxy clusters are the endpoints of structure formation and are continuously growing through the merging and accretion of smaller structures. Numerical simulations predict that a fraction of their energy content is not yet thermalized, mainly in the form of kinetic motions (turbulence, bulk motions). Measuring the level of non-thermal pressure su…
Gaia Data Release 2. Variable stars in the colour-absolute magnitude diagram
Prusti, T.; Mazeh, T.; Zucker, S. +453 more
Context. The ESA Gaia mission provides a unique time-domain survey for more than 1.6 billion sources with G ≲ 21 mag.
Aims: We showcase stellar variability in the Galactic colour-absolute magnitude diagram (CaMD). We focus on pulsating, eruptive, and cataclysmic variables, as well as on stars that exhibit variability that is due to rotation a…
Highly structured disk around the planet host PDS 70 revealed by high-angular resolution observations with ALMA
Liu, Y.; Henning, T.; van Boekel, R. +19 more
Context. Imaged in the gap of a transition disk and found at a separation of about 195 mas ( 22 au) from its host star at a position angle of about 155°, PDS 70 b is the most robustly detected young planet to date. This system is therefore a unique laboratory for characterizing the properties of young planetary systems at the stage of their format…
The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star
Schmitt, J. H. M. M.; Rebolo, R.; del Burgo, C. +180 more
Context. Teegarden's Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0 V), the star shows relatively little activity and is a prime target for near-infrared radial velocity surveys such as CARMENES.
Aims: As part of the CARMENES search for exoplanets around M dwarfs, we…
Hydrostatic mass profiles in X-COP galaxy clusters
Pointecouteau, E.; Rossetti, M.; Gastaldello, F. +7 more
Aims: We present the reconstruction of hydrostatic mass profiles in 13 X-ray luminous galaxy clusters that have been mapped in their X-ray and Sunyaev-Zeldovich (SZ) signals out to R200 for the XMM-Newton Cluster Outskirts Project (X-COP).
Methods: Using profiles of the gas temperature, density, and pressure that have been spa…
STiC: A multiatom non-LTE PRD inversion code for full-Stokes solar observations
Leenaarts, J.; Danilovic, S.; de la Cruz Rodríguez, J. +1 more
The inference of the underlying state of the plasma in the solar chromosphere remains extremely challenging because of the nonlocal character of the observed radiation and plasma conditions in this layer. Inversion methods allow us to derive a model atmosphere that can reproduce the observed spectra by undertaking several physical assumptions. The…
Tension with the flat ΛCDM model from a high-redshift Hubble diagram of supernovae, quasars, and gamma-ray bursts
Paolillo, M.; Nardini, E.; Amati, L. +4 more
In the current framework, the standard parametrization of our Universe is the so-called Lambda cold dark matter (ΛCDM) model. Recently, a ∼4σ tension with the ΛCDM model was shown to exist via a model-independent parametrization of a Hubble diagram of type Ia supernovae (SNe Ia) from the JLA survey and quasars. Model-independent approaches and ind…