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JWST Reveals Excess Cool Water near the Snow Line in Compact Disks, Consistent with Pebble Drift
Zhang, Ke; Pascucci, Ilaria; Banzatti, Andrea +19 more
Previous analyses of mid-infrared water spectra from young protoplanetary disks observed with the Spitzer-IRS found an anticorrelation between water luminosity and the millimeter dust disk radius observed with ALMA. This trend was suggested to be evidence for a fundamental process of inner disk water enrichment proposed decades ago to explain some…
Vanadium oxide and a sharp onset of cold-trapping on a giant exoplanet
Kesseli, Aurora Y.; Kasper, David; Bean, Jacob L. +15 more
The abundance of refractory elements in giant planets can provide key insights into their formation histories1. Owing to the low temperatures of the Solar System giants, refractory elements condense below the cloud deck, limiting sensing capabilities to only highly volatile elements2. Recently, ultra-hot giant exoplanets have…
Dilution of chemical enrichment in galaxies 600 Myr after the Big Bang
Heintz, Kasper E.; Brammer, Gabriel B.; Oesch, Pascal A. +10 more
The evolution of galaxies throughout the last 12 Gyr of cosmic time has followed a single, universal relation that connects star-formation rates (SFRs), stellar masses (M⋆) and chemical abundances. Deviation from this fundamental scaling relation would imply a drastic change in the processes that regulate galaxy evolution. Observations …
GA-NIFS: Black hole and host galaxy properties of two z ≃ 6.8 quasars from the NIRSpec IFU
Pérez-González, Pablo G.; Carniani, Stefano; Übler, Hannah +20 more
Aims: Integral field spectroscopy (IFS) with JWST NIRSpec will significantly improve our understanding of the first quasars, by providing spatially resolved, infrared spectroscopic capabilities that cover key rest-frame optical emission lines that have been previously unobservable.
Methods: Here we present our results from the first two …
A catalogue of high-mass X-ray binaries in the Galaxy: from the INTEGRAL to the Gaia era
García, Federico; Chaty, Sylvain; Fortin, Francis +1 more
Context. High-mass X-ray binaries (HMXBs) are a particular class of high-energy sources that require multi-wavelength observational efforts to be properly characterised. New identifications and the refinement of previous measurements are regularly published in the literature by independent teams of researchers and might, when they are collected in…
Crowded No More: The Accuracy of the Hubble Constant Tested with High-resolution Observations of Cepheids by JWST
Casertano, Stefano; Dolphin, Andrew; Riess, Adam G. +7 more
High-resolution James Webb Space Telescope (JWST) observations can test confusion-limited Hubble Space Telescope (HST) observations for a photometric bias that could affect extragalactic Cepheids and the determination of the Hubble constant. We present JWST NIRCAM observations in two epochs and three filters of >320 Cepheids in NGC 4258 (which …
Deep ALMA redshift search of a z ∼ 12 GLASS-JWST galaxy candidate
Santini, Paola; Casey, Caitlin M.; Castellano, Marco +20 more
The JWST has discovered a surprising abundance of bright galaxy candidates in the very early universe (≤500 Myr after the Big Bang), calling into question current galaxy formation models. Spectroscopy is needed to confirm the primeval nature of these candidates, as well as to understand how the first galaxies form stars and grow. Here we present d…
Gravitationally lensed quasars in Gaia - IV. 150 new lenses, quasar pairs, and projected quasars
Treu, T.; Courbin, F.; Anguita, T. +10 more
We report the spectroscopic follow-up of 175 lensed quasar candidates selected using Gaia Data Release 2 observations following Paper III of this series. Systems include 86 confirmed lensed quasars and a further 17 likely lensed quasars based on imaging and/or similar spectra. We also confirm 11 projected quasar pairs and 11 physical quasar pairs,…
Nitrogen enrichment and clustered star formation at the dawn of the Galaxy
Belokurov, Vasily; Kravtsov, Andrey
Anomalously high nitrogen-to-oxygen abundance ratios [N/O] are observed in globular clusters (GCs), among the field stars of the Milky Way (MW), and even in the gas in a z ≈ 11 galaxy. Using data from the APOGEE Data Release 17 and the Gaia Data Release 3, we present several independent lines of evidence that most of the MW's high-[N/O] stars were…
Evidence for the volatile-rich composition of a 1.5-Earth-radius planet
Fortney, Jonathan J.; Knutson, Heather A.; Angus, Ruth +18 more
The population of planets smaller than approximately 1.7 Earth radii (R⊕) is widely interpreted as consisting of rocky worlds, generally referred to as super-Earths. This picture is largely corroborated by radial velocity mass measurements for close-in super-Earths but lacks constraints at lower insolations. Here we present the results …