Search Publications
Distances to Galactic X-ray binaries with Gaia DR2
Barmby, P.; Bahramian, A.; Arnason, R. M. +2 more
Precise and accurate measurements of distances to Galactic X-ray binaries (XRBs) reduce uncertainties in the determination of XRB physical parameters. We have cross-matched the XRB catalogues of Liu, van Paradijs & van den Heuvel to the results of Gaia Data Release 2. We identify 86 XRBs with a Gaia candidate counterpart, of which 32 are low-m…
L-GALAXIES 2020: The evolution of radial metallicity profiles and global metallicities in disc galaxies
White, Simon D. M.; Yates, Robert M.; Henriques, Bruno M. B. +5 more
We present a modified version of the L-GALAXIES2020 semi-analytic model of galaxy evolution, which includes significantly increased direct metal enrichment of the circumgalactic medium (CGM) by supernovae (SNe). These more metal-rich outflows do not require increased mass-loading factors, in contrast to some other galaxy evolution models. This mod…
An inventory of atomic species in the atmosphere of WASP-121b using UVES high-resolution spectroscopy
Nikolov, Nikolay; de Mooij, Ernst J. W.; Gibson, Neale P. +8 more
Ultrahot Jupiters (UHJs) present excellent targets for atmospheric characterization. Their hot dayside temperatures (T ≳ 2200 K) strongly suppress the formation of condensates, leading to clear and highly inflated atmospheres extremely conducive to transmission spectroscopy. Recent studies using optical high-resolution spectra have discovered a pl…
ZZ Piscis Austrinus (ZZ PsA): a bright red nova progenitor and the instability mass ratio of contact binary stars
Filipović, Miroslav D.; Tothill, N. F. H.; Wadhwa, Surjit S. +4 more
ZZ Piscis Austrinus (ZZ PsA) is a neglected bright southern contact binary system with maximum V magnitude of 9.26. We present the first multiband photometric analysis and find the system to be in deep contact (>95 per cent) with an extremely low mass ratio of 0.078. The primary has a mass of 1.213 M⊙ in keeping with its reported spe…
The PAU Survey: an improved photo-z sample in the COSMOS field
Alarcon, Alex; Carretero, Jorge; Castander, Francisco J. +21 more
We present - and make publicly available - accurate and precise photometric redshifts in the ACS footprint from the COSMOS field for objects with iAB ≤ 23. The redshifts are computed using a combination of narrow-band photometry from PAUS, a survey with 40 narrow bands spaced at $100\,\mathring{\rm A}$ intervals covering the range from …
A precise asteroseismic age and metallicity for HD 139614: a pre-main-sequence star with a protoplanetary disc in Upper Centaurus-Lupus
Bedding, Timothy R.; White, Timothy R.; Murphy, Simon J. +2 more
HD 139614 is known to be a ∼14-Myr-old, possibly pre-main-sequence star in the Sco-Cen OB association in the Upper Centaurus-Lupus subgroup, with a slightly warped circumstellar disc containing ring structures hinting at one or more planets. The star's chemical abundance pattern is metal-deficient except for volatile elements, which places it in t…
Mock light-cones and theory friendly catalogues for the CANDELS survey
Ferguson, Henry C.; Somerville, Rachel S.; Yung, L. Y. Aaron +9 more
We present mock catalogues created to support the interpretation of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). We extract haloes along past light-cones from the Bolshoi Planck dissipationless N-body simulations and populate these haloes with galaxies using two different independently developed semi-analytic models of g…
The number of globular clusters around the iconic UDG DF44 is as expected for dwarf galaxies
Beasley, Michael A.; Trujillo, Ignacio; Peletier, Reynier F. +2 more
There is a growing consensus that the vast majority of ultradiffuse galaxies (UDGs) are dwarf galaxies. However, there remain a few UDGs that seem to be special in terms of their globular cluster (GC) systems. In particular, according to some authors, certain UDGs exhibit large GC populations when compared to expectations from their stellar (or to…
A constraint on light primordial black holes from the interstellar medium temperature
Kim, Hyungjin
Primordial black holes are a viable dark matter candidate. They decay via Hawking evaporation. Energetic particles from the Hawking radiation interact with interstellar gas, depositing their energy as heat and ionization. For a sufficiently high Hawking temperature, fast electrons produced by black holes deposit a substantial fraction of energy as…
Structure and morphology of the MATLAS dwarf galaxies and their central nuclei
Müller, Oliver; Duc, Pierre-Alain; Lim, Sungsoon +10 more
We present a photometric study of the dwarf galaxy population in the low to moderate density environments of the MATLAS (Mass Assembly of early-Type gaLAxies with their fine Structures) deep imaging survey. The sample consists of 2210 dwarfs, including 508 nucleated. We define a nucleus as a compact source that is close to the galaxy photocentre (…