Search Publications
Annular substructures in the transition disks around LkCa 15 and J1610
Ansdell, M.; Facchini, S.; Pinilla, P. +8 more
We present high-resolution millimeter continuum ALMA observations of the disks around the T Tauri stars LkCa 15 and 2MASS J16100501-2132318 (hereafter, J1610). These transition disks host dust-depleted inner regions, which have possibly been carved by massive planets, and they are of prime interest to the study of the imprints of planet-disk inter…
HADES RV programme with HARPS-N at TNG. XII. The abundance signature of M dwarf stars with planets
Baratella, M.; Rebolo, R.; Ribas, I. +27 more
Context. Most of our current knowledge on planet formation is still based on the analysis of main sequence, solar-type stars. Conversely, detailed chemical studies of large samples of M dwarfs hosting planets are still missing.
Aims: Correlations exist between the presence of different types of planets around FGK stars and metallicity, indivi…
Hints on the origins of particle traps in protoplanetary disks given by the Mdust - M⋆ relation
Pascucci, Ilaria; Pinilla, Paola; Marino, Sebastian
Context. Demographic surveys of protoplanetary disks, carried out mainly with the Atacama Large Millimeter/submillimete Array, have provided access to a large range of disk dust masses (Mdust) around stars with different stellar types and in different star-forming regions. These surveys found a power-law relation between Mdust
The messy merger of a large satellite and a Milky Way-like galaxy
Helmi, Amina; Koppelman, Helmer H.; Bos, Roy O. Y.
Aims: About 10 billion years ago the Milky Way merged with a massive satellite, Gaia-Enceladus. To gain insight into the properties of its debris we analyse in detail a suite of simulations that includes an experiment that produces a good match to the kinematics of nearby halo stars inferred from Gaia data.
Methods: We compare the kinema…
Globular clusters in the Sagittarius stream. Revising members and candidates with Gaia DR2
Bellazzini, M.; Famaey, B.; Malhan, K. +3 more
We reconsider the case for the association of Galactic globular clusters to the tidal stream of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) using Gaia DR2 data. We used RR Lyrae variables to trace the stream in 6D and we selected clusters matching the observed stream in position and velocity. In addition to the clusters residing in the main…
First detection of stacked X-ray emission from cosmic web filaments
Aghanim, N.; Douspis, M.; Malavasi, N. +2 more
We report the first statistical detection of X-ray emission from cosmic web filaments in ROSAT data. We selected 15 165 filaments at 0.2 < z < 0.6 ranging from 30 Mpc to 100 Mpc in length, identified in the Sloan Digital Sky Survey survey. We stacked the X-ray count-rate maps from ROSAT around the filaments, excluding resolved galaxy groups …
New white dwarf envelope models and diffusion. Application to DQ white dwarfs
Kepler, S. O.; Koester, D.; Irwin, A. W.
Context. Recent studies of the atmospheres of carbon-rich (DQ) white dwarfs have demonstrated the existence of two different populations that are distinguished by the temperature range, but more importantly, by the extremely high masses of the hotter group. The classical DQ below 10 000 K are well understood as the result of dredge-up of carbon by…
TRAPPIST-1: Global results of the Spitzer Exploration Science Program Red Worlds
Queloz, D.; Agol, E.; Delrez, L. +18 more
Context. With more than 1000 h of observation from Feb. 2016 to Oct. 2019, the Spitzer Exploration Program Red Worlds (ID: 13067, 13175 and 14223) exclusively targeted TRAPPIST-1, a nearby (12 pc) ultracool dwarf star, finding that it is orbited by seven transiting Earth-sized planets. At least three of these planets orbit within the classical hab…
WASP-127b: a misaligned planet with a partly cloudy atmosphere and tenuous sodium signature seen by ESPRESSO
Bouchy, F.; Rebolo, R.; Zapatero Osorio, M. R. +46 more
Context. The study of exoplanet atmospheres is essential for understanding the formation, evolution, and composition of exoplanets. The transmission spectroscopy technique is playing a significant role in this domain. In particular, the combination of state-of-the-art spectrographs at low- and high-spectral resolution is key to our understanding o…
Seismic evidence for near solid-body rotation in two Kepler subgiants and implications for angular momentum transport
Eggenberger, P.; Spada, F.; Deheuvels, S. +3 more
Context. Asteroseismic measurements of the internal rotation of subgiants and red giants all show the need for invoking a more efficient transport of angular momentum than theoretically predicted. Constraints on the core rotation rate are available starting from the base of the red giant branch (RGB) and we are still lacking information on the int…