Search Publications
juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems
Espinoza, Néstor; Kossakowski, Diana; Brahm, Rafael
Here we present juliet, a versatile tool for the analysis of transits, radial velocities, or both. juliet is built over many available tools for the modelling of transits, radial velocities, and stochastic processes (here modelled as Gaussian Processes; GPs) in order to deliver a tool/wrapper which can be used for the analysis of transit photometr…
Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2
Vasiliev, Eugene
We use Gaia Data Release 2 to determine the mean proper motions for 150 Milky Way globular clusters (almost the entire known population), with a typical uncertainty of 0.05 mas yr-1 limited mainly by systematic errors. Combining them with distance and line-of-sight velocity measurements from the literature, we analyse the distribution o…
The ASAS-SN catalogue of variable stars - II. Uniform classification of 412 000 known variables
Kochanek, C. S.; Stanek, K. Z.; Dong, Subo +12 more
The variable stars in the VSX catalogue are derived from a multitude of inhomogeneous data sources and classification tools. This inhomogeneity complicates our understanding of variable star types, statistics, and properties, and it directly affects attempts to build training sets for current (and next) generation all-sky, time-domain surveys. We …
Footprints of the Sagittarius dwarf galaxy in the Gaia data set
Laporte, Chervin F. P.; Gómez, Facundo A.; Minchev, Ivan +1 more
We analyse an N-body simulation of the interaction of the Milky Way (MW) with a Sagittarius-like dSph (Sgr), looking for signatures which may be attributed to its orbital history in the phase space volume around the Sun in light of Gaia DR2 discoveries. The repeated impacts of Sgr excite coupled vertical and radial oscillations in the disc which q…
Probing Galactic haloes with fast radio bursts
Prochaska, J. Xavier; Zheng, Yong
The precise localization (<1 arcsec) of multiple fast radio bursts (FRBs) to z > 0.1 galaxies has confirmed that the dispersion measures (DMs) of these enigmatic sources afford a new opportunity to probe the diffuse ionized gas around and in between galaxies. In this manuscript, we examine the signatures of gas in dark matter haloes (aka hal…
Inferences on the timeline of reionization at z ∼ 8 from the KMOS Lens-Amplified Spectroscopic Survey
Fontana, Adriano; Pentericci, Laura; Schmidt, Kasper B. +12 more
Detections and non-detections of Lyman alpha (Lyα) emission from z > 6 galaxies (<1 Gyr after the big bang) can be used to measure the timeline of cosmic reionization. Of key interest to measuring reionization's mid-stages, but also increasing observational challenge, are observations at z > 7, where Lyα redshifts to near infra-red wavele…
A year in the life of GW 170817: the rise and fall of a structured jet from a binary neutron star merger
Troja, E.; Piro, L.; van Eerten, H. +6 more
We present the results of our year-long afterglow monitoring of GW 170817, the first binary neutron star merger detected by Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) and Advanced Virgo. New observations with the Australian Telescope Compact Array and the Chandra X-ray Telescope were used to constrain its late-time behavio…
The GALAH survey and Gaia DR2: dissecting the stellar disc's phase space by age, action, chemistry, and location
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +24 more
We use the second data releases of the European Space AgencyGaia astrometric survey and the high-resolution Galactic Archaeology with HERMES (GALAH) spectroscopic survey to analyse the structure of our Galaxy's disc components. With GALAH, we separate the α-rich and α-poor discs (with respect to Fe), which are superposed in both position and veloc…
Deep learning of multi-element abundances from high-resolution spectroscopic data
Bovy, Jo; Leung, Henry W.
Deep learning with artificial neural networks is increasingly gaining attention because of its potential for data-driven astronomy. However, this methodology usually does not provide uncertainties and does not deal with incompleteness and noise in the training data. In this work, we design a neural network for high-resolution spectroscopic analysi…
Dynamical heating across the Milky Way disc using APOGEE and Gaia
Bovy, Jo; Chaplin, William J.; Cunha, Katia +14 more
The kinematics of the Milky Way disc as a function of age are well measured at the solar radius, but have not been studied over a wider range of Galactocentric radii. Here, we measure the kinematics of mono-age, mono-[Fe/H] populations in the low and high [α/Fe] discs between 4 ≲ R ≲ 13 kpc and |z| ≲ 2 kpc using 65 719 stars in common between APOG…