296 citations · 4.9k across the 120 of their papers we have counts for
46 papers · 1 filter
Globular Cluster UVIT legacy Survey (GlobUleS) III. Omega Centauri in Far-Ultraviolet
Deepthi S. Prabhu, Annapurni Subramaniam, Snehalata Sahu +21
We present the first comprehensive study of the most massive globular cluster Omega Centauri in the far-ultraviolet (FUV) extending from the center to ~ 28% of the tidal radius usi…
Searching for young runaways across the sky
Marina Kounkel, Aidan McBride, Keivan G. Stassun +1
We present a catalog of 3354 candidate young stars within 500 pc that appear to have been ejected from their parent associations with relative speeds of >5 km/s. These candidates h…
Searching for the extra-tidal stars of globular clusters using high-dimensional analysis and a core particle spray code
Steffani M. Grondin, Jeremy J. Webb, Nathan W. C. Leigh +2
Three-body interactions can eject stars from the core of a globular cluster, causing them to enter the Galactic halo as extra-tidal stars. While finding extra-tidal stars is impera…
Stellar Triples as a Source for Ba Stars
Yan Gao, Silvia Toonen, Nathan Leigh
Barium stars have been studied extensively over the past few decades, yet our current understanding of how these intriguing objects formed leaves much to be desired. Many trends ob…
SpaceHub: A high-performance gravity integration toolkit for few-body problems in astrophysics
Yi-Han Wang, Nathan Leigh, Bin Liu +1
We present the open source few-body gravity integration toolkit {\tt SpaceHub}. {\tt SpaceHub} offers a variety of algorithmic methods, including the unique algorithms AR-Radau, AR…
Mergers of Equal-Mass Binaries with Compact Object Companions from Mass Transfer in Triple Star Systems
N. W. C. Leigh, S. Toonen, S. F. Portegies Zwart +1
In this paper, we consider triple systems composed of main-sequence (MS) stars, and their internal evolution due to stellar and binary evolution. Our focus is on triples that produ…
Detection of White Dwarf Companions to Blue Straggler Stars from UVIT Observations of M67
Sindhu N, Annapurni Subramaniam, Aaron M Geller +6
We investigate the old open cluster M67 using ultraviolet photometric data of Ultra-Violet Imaging Telescope in multi-filter far-UV bands. M67, well known for the presence of sever…
Kinematic study of the association Cyg OB3 with Gaia DR2
Anjali Rao, Poshak Gandhi, Christian Knigge +3
We study the stellar kinematic properties and spatial distribution of the association Cyg OB3 using precise astrometric data from Gaia DR2. All known O- and B-type stars in Cyg OB3…
UVIT Open Cluster Study. I. Detection of a White Dwarf Companion to a Blue Straggler in M67: Evidence of Formation through Mass Transfer
N Sindhu, Annapurni Subramaniam, Vikrant V Jadhav +7
The old open cluster M67, populated with blue straggler stars (BSSs), is a well known test bed to study the BSS formation pathways. Here, we report the first direct detection of a…
Constraining Mass Transfer Histories of Blue Straggler Stars with COS Spectroscopy of White Dwarf Companions
Natalie M. Gosnell, Emily M. Leiner, Robert D. Mathieu +4
Recent studies show that the majority of blue straggler stars (BSSs) in old open clusters are formed through mass transfer from an evolved star onto a main-sequence companion, resu…
Detection of a White Dwarf companion to a Blue Straggler Star in the outskirts of globular cluster NGC 5466 with the Ultraviolet Imaging Telescope (UVIT)
Snehalata Sahu, Annapurni Subramaniam, Mirko Simunovic +8
We report the discovery of a hot white dwarf (WD) companion to a blue straggler star (BSS) in the globular cluster (GC) NGC 5466, based on observations from the Ultra-Violet Imagin…
In Search of the Thermal Eccentricity Distribution
Aaron M. Geller, Nathan W. C. Leigh, Mirek Giersz +2
About a century ago, Jeans (1919) discovered that if binary stars reach a state approximating energy equipartition, for example through many dynamical encounters that exchange ener…
A Triple Origin for Twin Blue Stragglers in Close Binaries
Simon Portegies Zwart, Nathan W. C. Leigh
We propose a formation mechanism for twin blue stragglers (BSs) in compact binaries that involves mass transfer from an evolved outer tertiary companion on to the inner binary via…
Constraints on blue straggler formation mechanisms in Galactic globular clusters from proper motion velocity distributions
N. W. C. Leigh, T. Panurach, M. Simunovic +10
For a sample of 38 Galactic globular clusters (GCs), we confront the observed distributions of blue straggler (BS) proper motions and masses (derived from isochrone fitting) from t…
Small-N collisional dynamics IV: Order in the realm of not-so-small-N
Nathan W. C. Leigh, Aaron M. Geller, Michael M. Shara +4
In this paper, the fourth in the series, we continue our study of combinatorics in chaotic Newtonian dynamics. We focus once again on the chaotic four-body problem in Newtonian gra…
When do star clusters become multiple star systems? II. Toward a half-life formalism with four bodies
Timur Ibragimov, Nathan W. C. Leigh, Taeho Ryu +2
We present a half-life formalism for describing the disruption of gravitationally-bound few-body systems, with a focus on binary-binary scattering. For negative total encounter ene…
Illustrating chaos: A schematic discretization of the general three-body problem in Newtonian gravity
Nathan W. C. Leigh, Shalma Wegsman
We present a formalism for constructing schematic diagrams to depict chaotic three-body interactions in Newtonian gravity. This is done by decomposing each interaction in to a seri…
Small-N collisional dynamics III: The battle for the realm of not-so-small-N
Nathan W. C. Leigh, Aaron M. Geller, Michael M. Shara +3
In this paper, the third in the series, we continue our study of combinatorics in chaotic Newtonian dynamics. We study the chaotic four-body problem in Newtonian gravity assuming f…
On the Origin of Sub-subgiant Stars. I. Demographics
Aaron M. Geller, Emily M. Leiner, Andrea Bellini +8
Sub-subgiants are stars observed to be redder than normal main-sequence stars and fainter than normal subgiant (and giant) stars in an optical color-magnitude diagram. The red stra…
On the Origin of Sub-subgiant Stars. III. Formation Frequencies
Aaron M. Geller, Emily M. Leiner, Sourav Chatterjee +3
Sub-subgiants are a new class of stars that are optically redder than normal main-sequence stars and fainter than normal subgiant stars. Sub-subgiants, and the possibly related red…
Numerical study of the chaotic N=4 problem in a background potential
Taeho Ryu, Nathan W. C. Leigh, Rosalba Perna
We perform a large suite of numerical scattering experiments between two identical binaries consisting of identical point particles in a (continuous) background potential. Fo…
The chaotic four-body problem in Newtonian gravity I: Identical point-particles
Nathan W. C. Leigh, Nicholas C. Stone, Aaron M. Geller +4
In this paper, we study the chaotic four-body problem in Newtonian gravity. Assuming point particles and total encounter energies 0, the problem has three possible outcomes.…
When does a star cluster become a multiple star system? I. Lifetimes of equal-mass small-N systems
Nathan W. C. Leigh, Michael M. Shara, Aaron M. Geller
What is the difference between a long-lived unstable (or quasi-stable) multiple star system and a bona fide star cluster? In this paper, we present a possible framework to address…
Interrupted Binary Mass Transfer in Star Clusters
Nathan W. C. Leigh, Aaron M. Geller, Silvia Toonen
Binary mass transfer is at the forefront of some of the most exciting puzzles of modern astrophysics, including Type Ia supernovae, gamma-ray bursts, and the formation of most obse…