Search Publications
Shallower radius valley around low-mass hosts: evidence for icy planets, collisions, or high-energy radiation scatter
Owen, James E.; Van Eylen, Vincent; Schlichting, Hilke E. +2 more
The radius valley, i.e. a dearth of planets with radii between 1.5 and 2 Earth radii, provides insights into planetary formation and evolution. Using homogenously revised planetary parameters from Kepler 1-min short cadence light curves, we remodel transits of 72 small planets mostly orbiting low-mass stars, improving the precision and accuracy of…
The great escape: understanding the connection between Ly α emission and LyC escape in simulated JWST analogues
Garel, Thibault; Saxena, Aayush; Blaizot, Jeremy +6 more
Constraining the escape fraction of Lyman Continuum (LyC) photons from high-redshift galaxies is crucial to understanding reionization. Recent observations have demonstrated that various characteristics of the Ly$\, \alpha$ emission line correlate with the inferred LyC escape fraction ($f_{\rm esc}^{\rm LyC}$) of low-redshift galaxies. Using a dat…
Seven white dwarfs with circumstellar gas discs I: white dwarf parameters and accreted planetary abundances
Melis, C.; Zuckerman, B.; Hodgkin, S. +9 more
Observations of planetary material polluting the atmospheres of white dwarfs are an important probe of the bulk composition of exoplanetary material. Medium- and high-resolution optical and ultraviolet spectroscopy of seven white dwarfs with known circumstellar dust and gas emission are presented. Detections or meaningful upper limits for photosph…
Chemodynamical models of our Galaxy
Vasiliev, Eugene; Binney, James
A chemodynamical model of our Galaxy is fitted to data from DR17 of the APOGEE survey supplemented with data from the StarHorse catalogue and Gaia DR3. Dynamically, the model is defined by action-based distribution functions for dark matter and six stellar components plus a gas disc. The gravitational potential jointly generated by the model's com…
A unified model for the clustering of quasars and galaxies at z ≈ 6
Hennawi, Joseph F.; Naidu, Rohan P.; Kashino, Daichi +12 more
Recent observations from the EIGER JWST program have measured for the first time the quasar-galaxy cross-correlation function at
The debris of the 'last major merger' is dynamically young
Horta, Danny; Sanderson, Robyn; Donlon, Thomas +4 more
The Milky Way's (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the 'last major merger.' Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor collided with the MW proto-disc 8-11 Gyr ago, and the Virgo Radial Merger (VRM), where the proge…
Local primordial non-Gaussianity from the large-scale clustering of photometric DESI luminous red galaxies
Miquel, Ramon; Sanchez, Eusebio; Font-Ribera, Andreu +46 more
We use angular clustering of luminous red galaxies from the Dark Energy Spectroscopic Instrument (DESI) imaging surveys to constrain the local primordial non-Gaussianity parameter fNL. Our sample comprises over 12 million targets, covering 14 000 deg2 of the sky, with redshifts in the range 0.2 < z < 1.35. We identify G…
Peeling back the layers of extinction of dusty galaxies in the era of JWST: modelling joint NIRSpec + MIRI spectra at rest-frame 1.5-28 µm
Rigopoulou, D.; Pereira-Santaella, M.; Alonso-Herrero, A. +3 more
We present an analysis of the combined NIRSpec and MIRI spectra of dusty galaxies between 1.5 and 28 $\mu$m rest-frame by implementing a differential extinction model, where the strength of extinction varies across the spectrum as different layers of the obscuring dust are probed. Our model is able to recover a 2D distribution of dust temperature …
Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing
Massey, Richard; Robertson, Andrew; Cole, Shaun +8 more
In a strong gravitational lensing system, the distorted light from a source is analysed to infer the properties of the lens. However, light emitted by the lens itself can contaminate the image of the source, introducing systematic errors in the analysis. We present a simple and efficient lens light model based on the well-tested multi-Gaussian exp…
A new step forward in realistic cluster lens mass modelling: analysis of Hubble Frontier Field Cluster Abell S1063 from joint lensing, X-ray, and galaxy kinematics data
Koekemoer, Anton M.; Mahler, Guillaume; Richard, Johan +14 more
We present a new method to simultaneously and self-consistently model the mass distribution of galaxy clusters that combines constraints from strong lensing features, X-ray emission, and galaxy kinematics measurements. We are able to successfully decompose clusters into their collisionless and collisional mass components thanks to the X-ray surfac…