Search Publications
Constraining axion-like particles using the white dwarf initial-final mass relation
Dolan, Matthew J.; Hiskens, Frederick J.; Volkas, Raymond R.
Axion-like particles (ALPs), a class of pseudoscalars common to many extensions of the Standard Model, have the capacity to drain energy from the interiors of stars. Consequently, stellar evolution can be used to derive many constraints on ALPs. We study the influence that keV-MeV scale ALPs which interact exclusively with photons can exert on the…
The non-monotonic, strong metallicity dependence of the wide-binary fraction
Ting, Yuan-Sen; Wyse, Rosemary F. G.; Zakamska, Nadia L. +2 more
The metallicity dependence of the wide-binary fraction (WBF) IN stellar populations plays a critical role in resolving the open question of wide-binary formation. In this paper, we investigate the metallicity ([Fe/H]) and age dependence of the WBF (binary separations between 103 and 104 au) for field F and G dwarfs within 500…
TOI-3362b: A Proto Hot Jupiter Undergoing High-eccentricity Tidal Migration
Triaud, Amaury H. M. J.; Latham, David W.; Quinn, Samuel N. +39 more
High-eccentricity tidal migration is a possible way for giant planets to be placed in short-period orbits. If this happens often, one would expect to catch proto hot Jupiters on highly elliptical orbits undergoing high-eccentricity tidal migration. As of yet, few such systems have been discovered. Here, we introduce TOI-3362b (TIC-464300749b), an …
Seasonal reappearance of HCl in the atmosphere of Mars during the Mars year 35 dusty season
Forget, F.; Montmessin, F.; Irwin, P. G. J. +15 more
Hydrogen chloride was discovered in the atmosphere of Mars for the first time during the global dust storm in Mars year (MY) 34 (July 2018) using the Atmospheric Chemistry Suite mid-infrared channel (ACS MIR) on the ExoMars Trace Gas Orbiter. The simultaneity of variations in dust and HCl, and a correlation between water vapour and HCl, led to the…
Finding Quasars behind the Galactic Plane. I. Candidate Selections with Transfer Learning
Feng, Xiaotong; Brown, Anthony G. A.; Yang, Qian +4 more
Quasars behind the Galactic plane (GPQs) are important astrometric references and useful probes of Milky Way gas. However, the search for GPQs is difficult due to large extinctions and high source densities in the Galactic plane. Existing selection methods for quasars developed using high Galactic latitude (high-b) data cannot be applied to the Ga…
High-resolution observations of molecular emission lines toward the CI Tau proto-planetary disc: planet-carved gaps or shadowing?
Ilee, John D.; Facchini, Stefano; Tazzari, Marco +4 more
Recent observations have revealed that most proto-planetary discs show a pattern of bright rings and dark gaps. However, most of the high-resolution observations have focused only on the continuum emission. In this paper, we present high-resolution ALMA band 7 (0.89 mm) observations of the disc around the star CI Tau in the 12CO & <…
The Geometry of Cold, Metal-enriched Gas around Galaxies at z ∼ 1.2
van Dokkum, Pieter; York, Donald G.; Chisholm, John +10 more
We present the first results from a Hubble Space Telescope Wide Field Camera 3/Infrared program, which obtained direct imaging and grism observations of galaxies near quasar sightlines with a high frequency of uncorrelated foreground Mg II absorption. These highly efficient observations targeted 54 Mg II absorbers along the line of sight to nine q…
Evidence for Radial Expansion at the Core of the Orion Complex with Gaia EDR3
Meingast, Stefan; Alves, João; Zucker, Catherine +6 more
We present a phase-space study of two stellar groups located at the core of the Orion Complex: Briceño-1 and Orion Belt Population-near (OBP-near). We identify the groups with the unsupervised clustering algorithm, Shared Nearest Neighbor (SNN), which previously identified 12 new stellar substructures in the Orion Complex. For each of the two grou…
The Swift bulge survey: motivation, strategy, and first X-ray results
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +12 more
Very faint X-ray transients (VFXTs) are X-ray transients with peak X-ray luminosities (LX) of L$_X \lesssim 10^{36}$ erg s-1, which are not well understood. We carried out a survey of 16 deg2 of the Galactic Bulge with the Swift Observatory, using short (60 s) exposures, and returning every 2 weeks for 19 epochs in…
Molecular mapping of the PDS70 system. No molecular absorption signatures from the forming planet PDS70 b
Quanz, S. P.; Snellen, I. A. G.; Stolker, T. +7 more
Context. Determining the chemical properties of the atmosphere of young forming gas giants might shed light on the location their formation occurred and the mechanisms involved.
Aims: Our aim was to detect molecules in the atmosphere of the young forming companion PDS70 b by searching for atmospheric absorption features typical of substellar …