Search Publications
A catalogue of Galactic GEMS: Globular cluster Extra-tidal Mock Stars
Speagle, Joshua S.; Lane, James M. M.; Webb, Jeremy J. +2 more
This work presents the Globular cluster Extra-tidal Mock Star (GEMS) catalogue of extra-tidal stars and binaries created via three-body dynamical encounters in globular cluster cores. Using the particle-spray code Corespray, we sample $N=50\, 000$ extra-tidal stars and escaped recoil binaries for 159 Galactic globular clusters. Sky positions, kine…
Discovery and follow-up of ASASSN-23bd (AT 2023clx): the lowest redshift and luminosity optically selected tidal disruption event
Kochanek, C. S.; Galbany, L.; Brown, P. J. +23 more
We report the All-Sky Automated Survey for SuperNovae discovery of the tidal disruption event (TDE) ASASSN-23bd (AT 2023clx) in NGC 3799, a LINER galaxy with no evidence of strong active galactic nucleus (AGN) activity over the past decade. With a redshift of z = 0.01107 and a peak ultraviolet (UV)/optical luminosity of (5.4 ± 0.4) × 1042
Not-so-fast Kepler-1513: a perturbing planetary interloper in the exomoon corridor
Dalba, Paul A.; McLeod, Kim K.; Nesvorný, David +9 more
Transit timing variations (TTVs) can be induced by a range of physical phenomena, including planet-planet interactions, planet-moon interactions, and stellar activity. Recent work has shown that roughly half of moons would induce fast TTVs with a short period in the range of 2-4 orbits of its host planet around the star. An investigation of the Ke…
The GALAH survey: tracing the Milky Way's formation and evolution through RR Lyrae stars
Lewis, Geraint F.; Casey, Andrew R.; Matsunaga, Noriyuki +39 more
Stellar mergers and accretion events have been crucial in shaping the evolution of the Milky Way (MW). These events have been dynamically identified and chemically characterized using red giants and main-sequence stars. RR Lyrae (RRL) variables can play a crucial role in tracing the early formation of the MW since they are ubiquitous, old (t ≥ 10 …
Exploring the origin of the distance bimodality of stars in the periphery of the Small Magellanic Cloud with APOGEE and Gaia
Monachesi, Antonela; Choi, Yumi; Majewski, Steven R. +12 more
The Magellanic Cloud system represents a unique laboratory for study of both interacting dwarf galaxies and the ongoing process of the formation of the Milky Way and its halo. We focus on one aspect of this complex, three-body interaction - the dynamical perturbation of the Small Magellanic Cloud (SMC) by the Large Magellanic Cloud (LMC), and spec…
Galaxy kinematics and mass estimates at z 1 from ionized gas and stars
Übler, Hannah; D'Eugenio, Francesco; Straatman, Caroline M. S. +14 more
We compare ionized gas and stellar kinematics of 16 star-forming galaxies (log (M⋆/M⊙) = 9.7-11.2, SFR =6 - 86 M⊙ yr-1) at z ~ 1 using near-infrared integral field spectroscopy (IFS) of Hα emission from the KMOS3D (the K-band Multi-Object Spectrograph 3D) survey and optical slit spectroscopy o…
White dwarf pollution: one star or two?
Toonen, Silvia; Hollands, Mark; Farihi, Jay +1 more
The accretion of tidally disrupted planetary bodies is the current consensus model for the presence of photospheric metals commonly detected in white dwarfs. While most dynamical studies have considered a single star and associated planetary instabilities, several investigations have instead considered the influence of widely bound stellar compani…
On the bright end of the UV luminosity functions of galaxies at z 0.6-1.2
Page, M. J.; Breeveld, A. A.; Ferreras, I. +1 more
We derive the ultraviolet (UV) luminosity function (LF) of star-forming galaxies in the redshift range z = 0.6-1.2, in the rest-frame far-UV (1500 Å) wavelength. For this work, we are in particular interested in the bright end of the UV LF in this redshift range. Data from the XMM-Newton Optical Monitor (XMM-OM), near-UV (2410-3565 Å) observations…
Cosmic dipoles of active galactic nuclei at optical and radio wavelengths display much larger amplitudes than the cosmic microwave background dipole
Singal, Ashok K.
Sky distributions of large samples of distant active galactic nuclei (AGNs) have shown dipoles significantly larger than the cosmic microwave background (CMB) dipole. However, a recent Bayesian analysis of the Quaia sample, comprising 1.3 million quasars, has yielded a dipole that seems to be in tandem with the CMB dipole, in contravention of most…
A hidden population of massive white dwarfs: two spotted K + WD binaries
Lu, Jessica R.; Fulton, Benjamin J.; Kochanek, Christopher S. +10 more
The identification and characterization of massive (≳ 0.8 M⊙) white dwarfs is challenging in part due to their low luminosity. Here, we present two candidate single-lined spectroscopic binaries, Gaia DR3 4014708864481651840 and 5811237403155163520, with K-dwarf primaries and optically dark companions. Both have orbital periods of P ~ 0.…