8 papers
The true masses of radial-velocity exoplanets constrained by stability
Xander Byrne, Amy Bonsor
Exoplanets discovered with the radial velocity method suffer from a mass-inclination degeneracy: only the minimum mass is measured. An exoplanet with an Ea…
To be lensed or not to be lensed: on the nature of the alleged high-z lensed quasars J0109-5424 and P170+20
Aurora Mata-Sanchez, Emanuele P. Farina, Anniek J. Gloudemans +17
We present a detailed multi-wavelength analysis of two gravitationally lensed z>6 quasar candidates: J0109-5424 and P170+20. Using JWST/NIRSpec near-infrared data from the Aether s…
The Barnard's Star Planetary System: Stability, Composition, and Evolution of Four Sub-Earth Exoplanets
Xander Byrne, Claire Marie Guimond, Amy Bonsor +3
Barnard's Star is the nearest single star to the Sun (1.8 pc), and hosts four recently-discovered planets. The star also has well-characterized stellar abundances of important rock…
Transformational astrophysics and exoplanet science with Habitable Worlds Observatory's High Resolution Imager
Vincent Van Eylen, Richard Massey, Saeeda Awan +167
Habitable Worlds Observatory (HWO) will be NASA's flagship space telescope of the 2040s, designed to search for life on other planets and to transform broad areas of astrophysics.…
Finding rare classes in large datasets: the case of polluted white dwarfs from Gaia XP spectra
Xander Byrne, Amy Bonsor, Laura K. Rogers +1
The Gaia mission's third data release recorded low-resolution spectra for about 100 000 white dwarf candidates. A small subset of these spectra show evidence of characteristic broa…
Semi-supervised Spectral Classification of DESI White Dwarfs by Dimensionality Reduction
Xander Byrne, Amy Bonsor, Laura K. Rogers +1
As a new generation of large-sky spectroscopic surveys comes online, the enormous data volume poses unprecedented challenges in classifying spectra. Modern unsupervised techniques…
Quasar Island -- Three new quasars, including a lensed candidate, identified with contrastive learning
Xander Byrne, Romain A. Meyer, Emanuele Paolo Farina +5
Of the hundreds of quasars discovered to date, only one is known to be gravitationally lensed, despite the high lensing optical depth expected at . High-reds…
Atmospheres as a Window to Rocky Exoplanet Surfaces
Xander Byrne, Oliver Shorttle, Sean Jordan +1
As the characterization of exoplanet atmospheres proceeds, providing insights into atmospheric chemistry and composition, a key question is how much deeper into the planet we might…