Search Publications
Propeller states in locally supercritical ULXs
Walton, D. J.; Middleton, M.; Gúrpide, A.
An expected signature of the presence of neutron stars in the population of ultraluminous X-ray sources (ULXs) are large scale changes in X-ray luminosity, as systems reach spin equilibrium and a propeller state ensues. We explore the predicted luminosity changes when the disc is locally supercritical, finding that a significant parameter space in…
Early Results from GLASS-JWST. XX. Unveiling a Population of "Red Excess" Galaxies in Abell2744 and in the Coeval Field
Santini, Paola; Calabrò, Antonello; Castellano, Marco +26 more
We combine JWST/NIRCam imaging and MUSE data to characterize the properties of galaxies in different environmental conditions in the cluster Abell2744 (z = 0.3064) and in its immediate surroundings. We investigate how galaxy colors, morphology, and star-forming fractions depend on wavelength and on different parameterizations of environment. Our m…
Tentative detection of titanium oxide in the atmosphere of WASP-69 b with a 4m ground-based telescope
Zhao, Gang; Wang, Wei; Zhao, Fei +6 more
Transiting planets provide unique opportunities for the atmospheric characterization of exoplanets as they can reveal composition and the temperature structures at the day-night terminator regions in planetary atmospheres, and help understand the atmospheric process and formation environments of exoplanets. Here, we present the optical transmissio…
TOI-4010: A System of Three Large Short-period Planets with a Massive Long-period Companion
Vanderburg, Andrew; López-Morales, Mercedes; Bieryla, Allyson +53 more
We report the confirmation of three exoplanets transiting TOI-4010 (TIC-352682207), a metal-rich K dwarf observed by the Transiting Exoplanet Survey Satellite in Sectors 24, 25, 52, and 58. We confirm these planets with the High Accuracy Radial velocity Planet Searcher for the Northern Hemisphere radial velocity observations and measure their mass…
Hydrodynamic Atmospheric Escape in HD 189733 b: Signatures of Carbon and Hydrogen Measured with the Hubble Space Telescope
Mikal-Evans, Thomas; Sing, David K.; López-Morales, Mercedes +10 more
One of the most well-studied exoplanets to date, HD 189733 b, stands out as an archetypal hot Jupiter with many observations and theoretical models aimed at characterizing its atmosphere, interior, host star, and environment. We report here on the results of an extensive campaign to observe atmospheric escape signatures in HD 189733 b using the Hu…
Robust clustering of the local Milky Way stellar kinematic substructures with Gaia eDR3
Frebel, Anna; Necib, Lina; Ou, Xiaowei
Understanding local stellar kinematic substructures in the solar neighbourhood helps build a complete picture of the formation of the Milky Way, as well as an empirical phase space distribution of dark matter that would inform detection experiments. We apply the clustering algorithm HDBSCAN on the Gaia early third data release to identify a list o…
A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium
Ritchey, Adam M.; Federman, S. R.; Brown, J. M. +1 more
We present a comprehensive examination of interstellar P and Cl abundances based on an analysis of archival spectra acquired with the Space Telescope Imaging Spectrograph of the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer. Column densities of P II, Cl I, and Cl II are determined for a combined sample of 107 sight lines pr…
Asteroids seen by JWST-MIRI: Radiometric size, distance, and orbit constraints
Müller, T. G.; Micheli, M.; Bartczak, P. +3 more
Infrared measurements of asteroids are crucial for the determination of physical and thermal properties of individual objects, and for understanding the small-body populations in the solar system as a whole. However, standard radiometric methods can only be applied if the orbit of an object is known, hence its position at the time of the observati…
Refining the properties of the TOI-178 system with CHEOPS and TESS
Alonso, R.; Deleuil, M.; Erikson, A. +84 more
Context. The TOI-178 system consists of a nearby late K-dwarf transited by six planets in the super-Earth to mini-Neptune regime, with radii ranging from ~1.1 to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All planets but the innermost one form a chain of Laplace resonances. Mass estimates derived from a preliminary radial vel…
Planetary nebulae and supernova remnants in NGC 4214 from the SIGNALS survey
Vicens-Mouret, Sébastien; Drissen, Laurent; Robert, Carmelle +3 more
Using datacubes from the imaging Fourier transform spectrometer SITELLE at the Canada-France-Hawaii Telescope as part of the star formation, ionized gas, and nebular abundances legacy survey, we identify 15 new planetary nebulae (PNe) as well as five new supernova remnants (SNRs) in the outer parts of the nearby dwarf starburst galaxy NGC 4214. Th…