Search Publications
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.…
Kepler-411: a four-planet system with an active host star
Schmitt, J. H. M. M.; Wang, X.; Ioannidis, P. +3 more
We present a detailed characterization of the Kepler-411 system (KOI 1781). This system was previously known to host two transiting planets: one with a period of 3 days (R = 2.4 R⊕; Kepler-411b) and one with a period of 7.8 days (R = 4.4 R⊕; Kepler-411c), as well as a transiting planetary candidate with a 58-day period (R = 3…
Multiplicity of Galactic Cepheids and RR Lyrae stars from Gaia DR2. II. Resolved common proper motion pairs
Mérand, Antoine; Evans, Nancy Remage; Gieren, Wolfgang +6 more
Context. The multiplicity of classical Cepheids (CCs) and RR Lyrae stars (RRLs) is still imperfectly known, particularly for RRLs.
Aims: In order to complement the close-in short orbital period systems presented in Paper I, our aim is to detect the wide, spatially resolved companions of the targets of our reference samples of Galactic CCs and…
The role of molecular filaments in the origin of the prestellar core mass function and stellar initial mass function
André, Ph.; Arzoumanian, D.; Könyves, V. +2 more
Context. The origin of the stellar initial mass function (IMF) is one of the most debated issues in astrophysics.
Aims: Here we explore the possible link between the quasi-universal filamentary structure of star-forming molecular clouds and the origin of the IMF.
Methods: Based on our recent comprehensive study of filament properties fro…
Gaia GraL: Gaia DR2 Gravitational Lens Systems. III. A systematic blind search for new lensed systems
Djorgovski, S. G.; Stern, D.; Surdej, J. +13 more
Aims: In this work, we aim to provide a reliable list of gravitational lens candidates based on a search performed over the entire Gaia Data Release 2 (Gaia DR2). We also aim to show that the astrometric and photometric information coming from the Gaia satellite yield sufficient insights for supervised learning methods to automatically identi…
The supernova remnant population of the Small Magellanic Cloud
Maitra, Chandreyee; Ballet, Jean; Sasaki, Manami +6 more
Aims: We present a comprehensive study on the supernova remnant (SNR) population of the Small Magellanic Cloud (SMC). We measured multiwavelength properties of the SMC SNRs and compare them to those of the Large Magellanic Cloud (LMC) population.
Methods: This study combines the large dataset of XMM-Newton observations of the SMC, archiv…
The GAPS Programme with HARPS-N at TNG. XIX. Atmospheric Rossiter-McLaughlin effect and improved parameters of KELT-9b
Scandariato, G.; Pagano, I.; Fossati, L. +40 more
Aims: In the framework of the GAPS project, we observed the planet-hosting star KELT-9 (A-type star, v sin i 110 km s-1) with the HARPS-N spectrograph at the Telescopio Nazionale Galileo. In this work we analyse the spectra and the extracted radial velocities to constrain the physical parameters of the system and to detect the plan…