Search Publications
The CARMENES search for exoplanets around M dwarfs. Benchmarking the impact of activity in high-precision radial velocity measurements
Amado, P. J.; Caballero, J. A.; Czesla, S. +17 more
Context. Current exoplanet surveys using the radial velocity (RV) technique are targeting M dwarfs because any habitable zone terrestrial-mass planets will induce a high RV and orbit on shorter periods than for more massive stars. One of the main caveats is that M dwarfs show a wide range of activity levels from inactive to very active, which can …
Dark matter in galaxy clusters: Parametric strong-lensing approach
Jullo, Eric; Limousin, Marceau; Beauchesne, Benjamin
We present a parametric strong-lensing analysis of three massive galaxy clusters for which Hubble Space Telescope imaging is available, as well as spectroscopy of multiply imaged systems and galaxy cluster members. Our aim is to probe the inner shape of dark matter haloes, in particular the existence of a core. We adopted the following working hyp…
The chemical composition of globular clusters in the Local Group
Larsen, S. S.; Strader, J.; Bergemann, M. +5 more
We present detailed chemical abundance measurements for 45 globular clusters (GCs) associated with galaxies in (and, in one case, beyond) the Local Group. The measurements are based on new high-resolution integrated-light spectra of GCs in the galaxies NGC 185, NGC 205, M 31, M 33, and NGC 2403, combined with reanalysis of previously published obs…
Stellar wind properties of the nearly complete sample of O stars in the low metallicity young star cluster NGC 346 in the SMC galaxy
Hamann, W. -R.; Gallagher, J. S.; Prinja, R. K. +9 more
Context. Massive stars are among the main cosmic engines driving the evolution of star-forming galaxies. Their powerful ionising radiation and stellar winds inject a large amount of energy in the interstellar medium. Furthermore, mass-loss (Ṁ) through radiatively driven winds plays a key role in the evolution of massive stars. Even so, the wind ma…
Low-mass young stars in the Milky Way unveiled by DBSCAN and Gaia EDR3: Mapping the star forming regions within 1.5 kpc
Alcalá, J. M.; Micela, G.; Jeffries, R. D. +6 more
Context. With an unprecedented astrometric and photometric data precision, Gaia EDR3 provides, for the first time, the opportunity to systematically detect and map, in the optical bands, the low-mass populations of the star forming regions (SFRs) in the Milky Way.
Aims: We aim to provide a catalogue of the Gαiα EDR3 data (photometry, proper m…
TOI-1759 b: A transiting sub-Neptune around a low mass star characterized with SPIRou and TESS
Moutou, C.; Carmona, A.; Donati, J. -F. +57 more
We report the detection and characterization of the transiting sub-Neptune TOI-1759 b, using photometric time series from the Transiting Exoplanet Survey Satellite (TESS) and near-infrared spectropolarimetric data from the Spectro-Polarimètre Infra Rouge (SPIRou) on the Canada-France-Hawaii Telescope. TOI-1759 b orbits a moderately active M0V star…
Characterisation of Galactic carbon stars and related stars from Gaia EDR3
de Laverny, P.; Figueras, F.; Romero-Gómez, M. +1 more
The third early Gaia data release (EDR3) has improved the accuracy of the astrometric parameters of numerous long-period variable (LPV) stars. Many of these stars are on the asymptotic giant branch (AGB), showing either a C-rich or O-rich envelope and are characterised by high luminosity, changing surface composition, and intense mass loss. This m…
The SAPP pipeline for the determination of stellar abundances and atmospheric parameters of stars in the core program of the PLATO mission
Kovalev, Mikhail; Casagrande, Luca; Serenelli, Aldo +25 more
We introduce the SAPP (Stellar Abundances and atmospheric Parameters Pipeline), the prototype of the code that will be used to determine parameters of stars observed within the core program of the PLATO space mission. The pipeline is based on the Bayesian inference and provides effective temperature, surface gravity, metallicity, chemical abundanc…
HST/WFC3 transmission spectroscopy of the cold rocky planet TRAPPIST-1h
Gillon, M.; Wakeford, H. R.; Lewis, N. K. +4 more
Aims: TRAPPIST-1 is a nearby ultra-cool dwarf star transited by seven rocky planets. We observed three transits of its outermost planet, TRAPPIST-1h, using the G141 grism of the Wide Field Camera 3 instrument aboard the Hubble Space Telescope to place constraints on its potentially cold atmosphere.
Methods: In order to deal with the effe…
CHEOPS geometric albedo of the hot Jupiter HD 209458 b
Guterman, P.; Alonso, R.; Deleuil, M. +74 more
We report the detection of the secondary eclipse of the hot Jupiter HD 209458 b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4−3.3+3.2 parts per million translates into a geometric albedo of Ag = 0.096 ± 0.016. The previously estimated dayside temperature of about 1500 K implies …