Search Publications
Metal enrichment and evolution in four z > 6.5 quasar sightlines observed with JWST/NIRSpec
Maiolino, R.; Jakobsen, P.; Perna, M. +7 more
We present JWST/NIRSpec R ≃ 2700 spectra of four high-redshift quasars: VDES J0020-3653 (z = 6.860), DELS J0411-0907 (z = 6.825), UHS J0439+1634 (z = 6.519), and ULAS J1342+0928 (z = 7.535). The exquisite data quality, signal-to-noise ratio of 50-200, and large 0.86 µm ≤ λ ≤ 5.5 µm spectral coverage allowed us to identify between 13 an…
TOI-1130: A photodynamical analysis of a hot Jupiter in resonance with an inner low-mass planet
Mustill, A. J.; Dai, F.; Gandolfi, D. +59 more
The TOI-1130 is a known planetary system around a K-dwarf consisting of a gas giant planet, TOI-1130 c on an 8.4-day orbit that is accompanied by an inner Neptune-sized planet, TOI-1130 b, with an orbital period of 4.1 days. We collected precise radial velocity (RV) measurements of TOI-1130 with the HARPS and PFS spectrographs as part of our ongoi…
CHEX-MATE: Constraining the origin of the scatter in galaxy cluster radial X-ray surface brightness profiles
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +25 more
We investigate the statistical properties and the origin of the scatter within the spatially resolved surface brightness profiles of the CHEX-MATE sample, formed by 118 galaxy clusters selected via the SZ effect. These objects have been drawn from the Planck SZ catalogue and cover a wide range of masses, M500 = [2 − 15]×1014 …
Cluster Ages to Reconstruct the Milky Way Assembly (CARMA). I. The final word on the origin of NGC 6388 and NGC 6441
Salaris, Maurizio; Ruiz-Lara, Tomás; Stokholm, Amalie +11 more
We present CARMA, the Cluster Ages to Reconstruct the Milky Way Assembly project, the aim of which is to determine precise and accurate age measurements for the entire system of known Galactic globular clusters (GCs) and to use them to trace the most significant merger events experienced by the Milky Way. The strength of CARMA relies on the use of…
Dissecting the RELICS cluster SPT-CLJ0615-5746 through intracluster light: Confirmation of the multiple merging state of the cluster formation
Vílchez, J. M.; Lopes, P. A. A.; Dupke, R. A. +1 more
The intracluster light (ICL) fraction, measured at certain specific wavelengths, has been shown to provide a good marker for determining the dynamical stage of galaxy clusters, that is, merging versus relaxed, for low to intermediate redshifts. We apply it for the first time to a high-redshift system, SPT-CLJ0615-5746 at z = 0.97, using its Reioni…
The IACOB project. VIII. Searching for empirical signatures of binarity in fast-rotating O-type stars
Herrero, A.; Simón-Díaz, S.; Nazé, Y. +6 more
Context. The empirical distribution of projected rotational velocities (v sin i) in massive O-type stars is characterised by a dominant slow velocity component and a tail of fast rotators. It has been proposed that binary interaction plays a dominant role in the formation of this tail.
Aims: We perform a complete and homogeneous search for em…
A hidden population of white dwarfs with atmospheric carbon traces in the Gaia bifurcation
Rebassa-Mansergas, Alberto; Hollands, Mark; Althaus, Leandro G. +4 more
Context. The high-quality photometric and astrometric capabilities of the ESA Gaia space mission have revealed a bifurcation of the white dwarf sequence on the color magnitude diagram with two branches: A and B. While the A branch consists mostly of white dwarfs with hydrogen(H)-rich atmospheres, the B branch is not completely understood. Although…
TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS★
Alonso, R.; Bouchy, F.; Deleuil, M. +92 more
Context. A large sample of long-period giant planets has been discovered thanks to long-term radial velocity surveys, but only a few dozen of these planets have a precise radius measurement. Transiting gas giants are crucial targets for the study of atmospheric composition across a wide range of equilibrium temperatures and, more importantly, for …
X-SHYNE: X-shooter spectra of young exoplanet analogs. I. A medium-resolution 0.65-2.5 µm one-shot spectrum of VHS 1256−1257 b
Bayo, A.; Tremblin, P.; Lagrange, A. -M. +13 more
We present simultaneous 0.65-2.5 µm medium resolution (3300 ≤ Rλ ≤ 8100) VLT/X-shooter spectra of the relatively young (150-300 Myr) low-mass (19 ± 5MJup) L-T transition object VHS 1256−1257 b, a known spectroscopic analog of HR8799d. The companion is a prime target for the JWST Early Release Science (ERS) and one of th…
Oxygen, sulfur, and iron radial abundance gradients of classical Cepheids across the Galactic thin disk★★★
Kovtyukh, V.; Lemasle, B.; Fabrizio, M. +25 more
Context. Classical Cepheids (CCs) are solid distance indicators and tracers of young stellar populations. Dating back to the beginning of the 20th century, they have been safely adopted to trace the rotation, kinematics, and chemical enrichment history of the Galactic thin disk.
Aims: The main aim of this investigation is to provide iron, oxy…