Search Publications
A statistical and multiwavelength photometric analysis of a young embedded open star cluster: IC 1590
Medhi, Biman J.; Sheikh, A. H.
We present a statistical and multiwavelength photometric studies of young open cluster IC 1590. We identified 91 cluster members using Gaia DR3 astrometry data using ensemble-based unsupervised machine learning techniques. From Gaia EDR3 data, we estimate the best-fitting parameters for IC 1590 using the Automated Stellar Cluster Analysis package …
The frequency and sizes of inner bars and nuclear rings in barred galaxies and their dependence on galaxy properties
Erwin, Peter
Using a volume- and mass-limited (D < 30 Mpc, $\log \, (M_{\star }/M_{\odot })\ge 9.75$) sample of 155 barred S0-Sd galaxies, I determine the fraction with secondary structures within their bars. Some 20 ± 3 per cent have a separate inner bar, making them double-barred; an identical fraction have nuclear rings, with $11^{+3}_{-2}$ per cent host…
The Hyper Suprime-Cam extended point spread functions and applications
Robotham, Aaron S. G.; Bellstedt, Sabine; Davies, Luke J. M. +2 more
We present extended point spread function (PSF) models for the Hyper Suprime-Cam Subaru Strategic Program Public Data Release 3 (HSC-SSP PDR3) in all g, r, i, Z, and Y-bands. Due to its 8.2 m primary mirror and long exposure periods, HSC combines deep images with wide-field coverage. Both properties make HSC one of the most suitable observing faci…
Inferring system parameters from the bursts of the accretion-powered pulsar IGR J17498-2921
Galloway, D. K.; Goodwin, A. J.; Hilder, T. +2 more
Thermonuclear (type-I) bursts exhibit properties that depend both on the local surface conditions of the neutron stars on which they ignite, as well as the physical parameters of the host binary system. However, constraining the system parameters requires a comprehensive method to compare the observed bursts to simulations. We have further develop…
Hints of a disrupted binary dwarf galaxy in the Sagittarius stream
Belokurov, Vasily; Monty, Stephanie; Davies, Elliot Y. +1 more
In this work, we look for evidence of a non-unity mass ratio binary dwarf galaxy merger in the Sagittarius stream. Simulations of such a merger show that, upon merging with a host, particles from the less massive galaxy will often mostly be found in the extended stream and less so in the central remnant. Motivated by these simulations, we use the …
Confronting compositional confusion through the characterization of the sub-Neptune orbiting HD 77946
Van Eylen, V.; Vanderburg, A.; Sozzetti, A. +29 more
We report on the detailed characterization of the HD 77946 planetary system. HD 77946 is an F5 (M* = 1.17 M⊙, R* = 1.31 R⊙) star, which hosts a transiting planet recently discovered by NASA's Transiting Exoplanet Survey Satellite (TESS), classified as TOI-1778 b. Using TESS photometry, high-resolution sp…
Discovery of a split stellar stream in the periphery of the Small Magellanic Cloud
Nidever, David L.
I report the discovery of a stellar stream (Sutlej) using Gaia DR3 (third data release) proper motions and XP metallicities located
The intrinsic X-ray luminosity distribution of an optically selected SDSS quasar population
Aird, James; Ruiz, Angel; Georgakakis, Antonis +1 more
In active galactic nuclei, the relationship between UV and X-ray luminosity is well studied (often characterised by αox) but often with heterogeneous samples. We have parametrized the intrinsic distribution of X-ray luminosity, LX, for the optically selected sample of SDSS quasars in the Stripe 82 and XXL fields across redshi…
Single-lined eclipsing binaries with δ Scuti components: GQ Dra, RR Lep, and TYC 683-640-1
Handler, G.; De Cat, P.; Kahraman Aliçavuş, F. +2 more
Eclipsing binaries with (a) pulsating component(s) are remarkable objects to investigate the evolution and structure of stellar systems. Detailed studies of such systems are also important to reveal their pulsation properties. The largest sample of pulsating eclipsing binaries is the one containing δ Scuti variables. In this study, we present a co…
cecilia: a machine learning-based pipeline for measuring metal abundances of helium-rich polluted white dwarfs
Vanderburg, Andrew; Badenas-Agusti, Mariona; Blouin, Simon +4 more
Over the past several decades, conventional spectral analysis techniques of polluted white dwarfs have become powerful tools to learn about the geology and chemistry of extrasolar bodies. Despite their proven capabilities and extensive legacy of scientific discoveries, these techniques are, however, still limited by their manual, time-intensive, a…