Search Publications
Rest-frame UV spectroscopy of extreme [O III] emitters at 1.3 < z < 3.7: toward a high-redshift UV reference sample for JWST
Charlot, Stéphane; Chevallard, Jacopo; Tang, Mengtao +3 more
Deep spectroscopy of galaxies in the reionization era has revealed intense C III] and C IV line emission (equivalent width, EW >15-20 Å). In order to interpret the nebular emission emerging at z > 6, we have begun targeting rest-frame ultraviolet (UV) emission lines in galaxies with large specific star formation rates (sSFRs) at 1.3 < z &…
The PYRAT BAY framework for exoplanet atmospheric modelling: a population study of Hubble/WFC3 transmission spectra
Cubillos, Patricio E.; Blecic, Jasmina
We present the open-source PYTHON Radiative-transfer in a Bayesian framework (PYRAT BAY) framework for exoplanet atmospheric modelling, spectral synthesis, and Bayesian retrieval. The modular design of the code allows the users to generate atmospheric 1D parametric models of the temperature, abundances (in thermochemical equilibrium or constant-wi…
Constraints on the presence of platinum and gold in the spectra of the kilonova AT2017gfo
Smartt, S. J.; Sim, S. A.; Gillanders, J. H. +2 more
Binary neutron star mergers are thought to be one of the dominant sites of production for rapid neutron capture elements, including platinum and gold. Since the discovery of the binary neutron star merger GW170817, and its associated kilonova AT2017gfo, numerous works have attempted to determine the composition of its outflowing material, but they…
How robustly can we constrain the low-mass end of the z ∼ 6-7 stellar mass function? The limits of lensing models and stellar population assumptions in the Hubble Frontier Fields
Charlot, Stéphane; Chevallard, Jacopo; Lehnert, Matthew D. +2 more
We present new measurements of the very low mass end of the galaxy stellar mass function (GSMF) at z ~ 6-7 computed from a rest-frame ultraviolet selected sample of dropout galaxies. These galaxies lie behind the six Hubble Frontier Field clusters and are all gravitationally magnified. Using deep Spitzer/IRAC and Hubble Space Telescope imaging, we…
The first ALMA survey of protoplanetary discs at 3 mm: demographics of grain growth in the Lupus region
Guidi, G.; Testi, L.; Tazzari, M. +9 more
We present the first ALMA survey of protoplanetary discs at 3 mm, targeting 36 young stellar objects in the Lupus star-forming region with deep observations (sensitivity 20-50 $\mu$Jy beam-1) at ~0.35 arcsec resolution (~50 au). Building on previous ALMA surveys at 0.89 and 1.3 mm that observed the complete sample of Class II discs in L…
The Cosmic Ultraviolet Baryon Survey (CUBS) - III. Physical properties and elemental abundances of Lyman-limit systems at z < 1
Faucher-Giguère, Claude-André; Johnson, Sean D.; Petitjean, Patrick +18 more
We present a systematic investigation of physical conditions and elemental abundances in four optically thick Lyman-limit systems (LLSs) at z = 0.36-0.6 discovered within the Cosmic Ultraviolet Baryon Survey (CUBS). Because intervening LLSs at z < 1 suppress far-UV (ultraviolet) light from background QSOs, an unbiased search of these absorbers …
Prospects for Galactic and stellar astrophysics with asteroseismology of giant stars in the TESS continuous viewing zones and beyond
Chaplin, William J.; Girardi, Léo; van Saders, Jennifer L. +30 more
The NASA Transiting Exoplanet Survey Satellite (NASA-TESS) mission presents a treasure trove for understanding the stars it observes and the Milky Way, in which they reside. We present a first look at the prospects for Galactic and stellar astrophysics by performing initial asteroseismic analyses of bright (G < 11) red giant stars in the TESS s…
Deblending galaxies with variational autoencoders: A joint multiband, multi-instrument approach
LSST Dark Energy Science Collaboration; Aubourg, Eric; Doux, Cyrille +2 more
Blending of galaxies has a major contribution in the systematic error budget of weak-lensing studies, affecting photometric and shape measurements, particularly for ground-based, deep, photometric galaxy surveys, such as the Rubin Observatory Legacy Survey of Space and Time (LSST). Existing deblenders mostly rely on analytic modelling of galaxy pr…
The S2 stream: the shreds of a primitive dwarf galaxy
Myeong, G. C.; Belokurov, Vasily; Matteucci, Francesca +12 more
The S2 stream is a kinematically cold stream that is plunging downwards through the Galactic disc. It may be part of a hotter and more diffuse structure called the Helmi stream. We present a multi-instrument chemical analysis of the stars in the metal-poor S2 stream using both high- and low-resolution spectroscopy, complemented with a re-analysis …
The VMC survey - XLIII. The spatially resolved star formation history across the Large Magellanic Cloud
Sun, Ning-Chen; Girardi, Léo; de Grijs, Richard +19 more
We derive the spatially resolved star formation history (SFH) for a 96 deg2 area across the main body of the Large Magellanic Cloud (LMC), using the near-infrared photometry from the VISTA survey of the Magellanic Clouds (VMC). The data and analyses are characterized by a great degree of homogeneity and a low sensitivity to the interste…