Search Publications
Star-forming content of the giant molecular filaments in the Milky Way
Henning, Th.; Zhang, M.; Fang, M. +2 more
Context. Through observations numerous giant molecular filaments (GMFs) have been discovered in the Milky Way. Their role in the Galactic star formation and Galaxy-scale evolution of dense gas is unknown.
Aims: We investigate systematically the star-forming content of all currently known GMFs. This allows us to estimate the star formation rat…
Euclid preparation. IV. Impact of undetected galaxies on weak-lensing shear measurements
Lilje, P. B.; Scott, D.; Schrabback, T. +22 more
In modern weak-lensing surveys, the common approach to correct for residual systematic biases in the shear is to calibrate shape measurement algorithms using simulations. These simulations must fully capture the complexity of the observations to avoid introducing any additional bias. In this paper we study the importance of faint galaxies below th…
Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES
Bouchy, F.; Doyon, R.; Bonfils, X. +13 more
In an earlier campaign to characterize the mass of the transiting temperate super-Earth K2-18b with HARPS, a second, non-transiting planet was posited to exist in the system at 9 days. Further radial velocity follow-up with the CARMENES spectrograph visible channel revealed a much weaker signal at 9 days, which also appeared to vary chromatically …
Rotation rate of the solar core as a key constraint to magnetic angular momentum transport in stellar interiors
Buldgen, G.; Eggenberger, P.; Salmon, S. J. A. J.
Context. The internal rotation of the Sun constitutes a fundamental constraint when modelling angular momentum transport in stellar interiors. In addition to the more external regions of the solar radiative zone probed by pressure modes, measurements of rotational splittings of gravity modes would offer an invaluable constraint on the rotation of …
An alternative interpretation of the exomoon candidate signal in the combined Kepler and Hubble data of Kepler-1625
Heller, René; Rodenbeck, Kai; Bruno, Giovanni
Context. Kepler and Hubble photometry of a total of four transits by the Jupiter-sized exoplanet Kepler-1625 b have recently been interpreted to show evidence of a Neptune-sized exomoon. The key arguments were an apparent drop in stellar brightness after the planet's October 2017 transit seen with Hubble and its 77.8 min early arrival compared to …
VISION - Vienna survey in Orion. III. Young stellar objects in Orion A
Meingast, Stefan; Alves, João; Bouy, Hervé +14 more
We have extended and refined the existing young stellar object (YSO) catalogs for the Orion A molecular cloud, the closest massive star-forming region to Earth. This updated catalog is driven by the large spatial coverage (18.3 deg2, ∼950 pc2), seeing limited resolution (∼0.7″), and sensitivity (Ks < 19 mag) of …
Detection and characterisation of 54 massive companions with the SOPHIE spectrograph. Seven new brown dwarfs and constraints on the brown dwarf desert
Bouchy, F.; Deleuil, M.; Moutou, C. +35 more
Context. Brown dwarfs (BD) are substellar objects intermediate between planets and stars with masses of ~13-80 MJ. While isolated BDs are most likely produced by gravitational collapse in molecular clouds down to masses of a few MJ, a non-negligible fraction of low-mass companions might be formed through the planet-formation …
Gaia DR 2 and VLT/FLAMES search for new satellites of the LMC
Carrera, R.; Fritz, T. K.; Battaglia, G. +1 more
A wealth of tiny galactic systems populates the surroundings of the Milky Way. However, some of these objects might have originated as former satellites of the Magellanic Clouds, in particular of the Large Magellanic Cloud (LMC). Examples of the importance of understanding how many systems are genuine satellites of the Milky Way or the LMC are the…
New criteria for the selection of galaxy close pairs from cosmological simulations: evolution of the major and minor merger fraction in MUSE deep fields
Inami, H.; Steinmetz, M.; Richard, J. +8 more
It remains a challenge to assess the merger fraction of galaxies at different cosmic epochs in order to probe the evolution of their mass assembly. Using the ILLUSTRIS cosmological simulation project, we investigate the relation between the separation of galaxies in a pair, both in velocity and projected spatial separation space, and the probabili…
Catalog for the ESPRESSO blind radial velocity exoplanet survey
Rebolo, R.; Zapatero Osorio, M. R.; Poretti, E. +19 more
Aims: One of the main scientific drivers for ESPRESSO, Échelle SPectrograph, is the detection and characterization of Earth-class exoplanets. With this goal in mind, the ESPRESSO guaranteed time observations (GTO) Catalog identifies the best target stars for a blind search for the radial velocity (RV) signals caused by Earth-class exoplanets.…