Search Publications
Unveiling the structural content of NGC 6357 via kinematics and NIR variability
Bayo, A.; Zoccali, M.; Rojas-Arriagada, A. +3 more
NGC 6357, a star-forming complex at $\sim 1.7$ kpc from the Sun, contains giant molecular clouds and three prominent star clusters alongside H II regions, very massive stars and thousands of young stellar objects in different evolutionary stages. We present a combined infrared kinematic and time domain study of the line of sight towards this regio…
A comparative study of dust grain polarization efficiencies in the interstellar and intracluster mediums towards anticentre galaxy
Jose, Jessy; Eswaraiah, Chakali; Gopinathan, Maheswar +2 more
Dust polarization observations at optical wavelengths help understand the dust grain properties and trace the plane-of-the-sky component of the magnetic field. In this study, we make use of published optical polarization data acquired with AIMPOL along with distances (d) and extinction (AV) data. We study the variation of polarization e…
Recovering the gravitational potential in a rotating frame: Deep Potential applied to a simulated barred galaxy
Green, Gregory M.; Ghosh, Soumavo; Kalda, Taavet
Stellar kinematics provides a window into the gravitational field, and therefore into the distribution of all mass, including dark matter. Deep Potential is a method for determining the gravitational potential from a snapshot of stellar positions in phase space, using mathematical tools borrowed from deep learning to model the distribution functio…
Correction to: TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue
Trifonov, Trifon; Henning, Thomas; Ramsay, Gavin +63 more
Discovering transiting exoplanets with relatively long orbital periods ($>$10 days) is crucial to facilitate the study of cool exoplanet atmospheres ($T_{\rm eq} < 700 K$) and to understand exoplanet formation and inward migration further out than typical transiting exoplanets. In order to discover these longer period transiting exoplanets, …
What causes the ultraviolet extinction bump at the cosmic dawn?
Li, Aigen; Yang, X. J.; Li, Qi
The enigmatic ultraviolet (UV) extinction bump at 2175
The only inflated brown dwarf in an eclipsing white dwarf-brown dwarf binary: WD1032+011B
Mayorga, L. C.; Lothringer, Joshua D.; Parmentier, Vivien +9 more
Due to their short orbital periods and relatively high-flux ratios, irradiated brown dwarfs in binaries with white dwarfs offer better opportunities to study irradiated atmospheres than hot Jupiters, which have lower planet-to-star flux ratios. WD1032+011 is an eclipsing, tidally locked white dwarf-brown dwarf binary with a 9950 K white dwarf orbi…
The SAMI galaxy survey: on the importance of applying multiple selection criteria for finding Milky Way analogues
Bland-Hawthorn, Joss; van de Sande, Jesse; Sweet, Sarah M. +10 more
Milky Way analogues (MWAs) provide an alternative insight into the various pathways that lead to the formation of disc galaxies with similar properties to the Milky Way (MW). In this study, we explore different selection techniques for identifying MWAs in the Sydney-AAO (Australian Astronomical Observatory) Multi-object Integral field spectrograph…
Exploring the properties of the obscured hyperluminous quasar COS-87259 at z = 6.853
Farrah, Duncan; Efstathiou, Andreas; Varnava, Charalambia
In this paper we explore the properties of the
Hierarchical Bayesian inference of globular cluster properties
Speagle, Joshua S.; Webb, Jeremy J.; Eadie, Gwendolyn M. +1 more
We present a hierarchical Bayesian inference approach to estimating the structural properties and the phase-space centre of a globular cluster (GC) given the spatial and kinematic information of its stars based on lowered isothermal cluster models. As a first step towards more realistic modelling of GCs, we built a differentiable, accurate emulato…
GHOST commissioning science results - III. Characterizing an iron-poor damped Lyman α system
Simpson, Chris; Hayes, Christian R.; Sestito, Federico +20 more
The Gemini High-resolution Optical SpecTrograph (GHOST) is a new Echelle spectrograph available on the Gemini-South telescope as of Semester 2024A. We present the first high-resolution spectrum of the quasar J1449-1227 (redshift zem = 3.27) using data taken during the commissioning of GHOST. The observed quasar hosts an intervening iron…