Search Publications
ALMA ACA study of the H2S/OCS ratio in low-mass protostars
Tabone, Benoît; Drozdovskaya, Maria N.; Tychoniec, Łukasz +1 more
Context. The identification of the main sulfur reservoir on its way from the diffuse interstellar medium to the cold dense star-forming cores and, ultimately, to protostars is a long-standing problem. Despite sulfur's astrochemical relevance, the abundance of S-bearing molecules in dense cores and regions around protostars is still insufficiently …
Investigating Gaia EDR3 parallax systematics using asteroseismology of cool giant stars observed by Kepler, K2, and TESS. II. Deciphering Gaia parallax systematics using red clump stars
Khan, S.; Anderson, R. I.; Miglio, A. +2 more
We analyse Gaia EDR3 parallax systematics as a function of magnitude and sky location using a recently published catalogue of 12 500 asteroseismic red-giant star distances. We selected ∼3500 red clump (RC) stars of similar chemical composition as the optimal subsample for this purpose because (1) their similar luminosity allows for straightforward…
The new detection of blue straggler stars in 50 open clusters using Gaia DR3
Chen, Li; Zhong, Jing; Qin, Songmei +1 more
Context. The particularly abundant presence of blue straggler stars (BSS) in Galactic open clusters offers favorable conditions for detailed studies on the statistical properties and the origin of the blue straggler population. With the help of Gaia DR3, the number of identified open clusters continuously increases, and the determination of star c…
A search for the afterglows, kilonovae, and host galaxies of two short GRBs: GRB 211106A and GRB 211227A
Covino, S.; D'Avanzo, P.; Campana, S. +30 more
Context. GRB 211106A and GRB 211227A are two recent gamma-ray bursts (GRBs) whose initial X-ray position enabled us to possibly associate them with bright, low-redshift galaxies (z < 0.7). The prompt emission properties suggest that GRB 211106A is a genuine short-duration GRB and GRB 211227A is a short GRB with extended emission. Therefore, the…
Dynamical masses of two young transiting sub-Neptunes orbiting HD 63433
Pallé, E.; Béjar, V. J. S.; Montes, D. +7 more
Context. Although the number of exoplanets reported in the literature exceeds 5000 so far, only a few dozen of them are young planets (≤900 Myr). However, a complete characterization of these young planets is key to understanding the current properties of the entire population. Hence, it is necessary to constrain the planetary formation processes …
The ALPINE-ALMA [CII] survey: Double stellar population and active galactic nucleus activity in a galaxy at z ∼ 5.5
Pozzi, F.; Schaerer, D.; Marques-Chaves, R. +16 more
Context. GDS J033218.92-275302.7 (here GS-14) is a z ∼ 5.5 galaxy with unusual UV spectral features that have been interpreted as signatures of either a double stellar population or of an active galactic nucleus (AGN). GS-14 was detected in [C II] 158 µm as part of the ALPINE survey and was found to be the galaxy with the lowest molecular ga…
WEAVE-StePS: A stellar population survey using WEAVE at WHT
Bolzonella, M.; Gullieuszik, M.; Moretti, A. +45 more
Context. The upcoming new generation of optical spectrographs on four-meter-class telescopes will provide valuable opportunities for forthcoming galaxy surveys through their huge multiplexing capabilities, excellent spectral resolution, and unprecedented wavelength coverage.
Aims: WEAVE is a new wide-field spectroscopic facility mounted on th…
3D tomography of the giant Lyα nebulae of z ≈ 3-5 radio-loud AGN
Noirot, Gaël; Lehnert, Matthew D.; De Breuck, Carlos +12 more
Lyα emission nebulae are ubiquitous around high-redshift galaxies and are tracers of the gaseous environment on scales out to ≳100 pkpc (proper kiloparsec). High-redshift radio galaxies (HzRGs, type-2 radio-loud quasars) host large-scale nebulae observed in the ionised gas differ from those seen in other types of high-redshift quasars. In this wor…
Probing the physics in the core boundary layers of the double-lined B-type binary KIC 4930889 from its gravito-inertial modes
Aerts, C.; Tkachenko, A.; Van Reeth, T. +1 more
Context. Stellar evolution models of B-type stars are still uncertain in terms of internal mixing properties, notably in the area between the convective core and the radiative envelope. This impacts age determination of such stars in addition to the computation of chemical yields produced at the end of their life.
Aims: We investigated the th…
The β Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
Boccaletti, Anthony; Pantin, Eric; Baruteau, Clément +26 more
Context. β Pictoris is a young nearby system hosting a well-resolved edge-on debris disk, along with at least two exoplanets. It offers key opportunities for carrying out detailed studies of the evolution of young planetary systems and their shaping soon after the end of the planetary formation phase.
Aims: We analyzed high-contrast coronagra…