Publications (41)
Testing the Relationship Between Bursty Star Formation and Size Fluctuations of Local Dwarf Galaxies
Najmeh Emami, Brian Siana, Kareem El-Badry +7
Stellar feedback in dwarf galaxies plays a critical role in regulating star formation via galaxy-scale winds. Recent hydrodynamical zoom simulations of dwarf galaxies predict that…
Classification of Astrophysics Journal Articles with Machine Learning to Identify Data for NED
Tracy X. Chen, Rick Ebert, Joseph M. Mazzarella +7
The NASA/IPAC Extragalactic Database (NED) is a comprehensive online service that combines fundamental multi-wavelength information for known objects beyond the Milky Way and provi…
LEGUS and Halpha-LEGUS Observations of Star Clusters in NGC 4449: Improved Ages and the Fraction of Light in Clusters as a Function of Age
Bradley C. Whitmore, Rupali Chandar, Janice Lee +16
We present a new catalog and results for the cluster system of the starburst galaxy NGC 4449 based on multi-band imaging observations taken as part of the LEGUS and Halpha-LEGUS su…
The structure of the Boij-Söderberg posets
David Cook
Boij and Söderberg made a pair of conjectures, which were subsequently proven by Eisenbud and Schreyer and then extended by Boij and Söderberg, about the structure of Betti diagr…
SPIRITS: Uncovering Unusual Infrared Transients With Spitzer
Mansi M. Kasliwal, John Bally, Frank Masci +44
We present an ongoing, systematic search for extragalactic infrared transients, dubbed SPIRITS --- SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IR…
Multicriteria Optimization Techniques for Understanding the Case Mix Landscape of a Hospital
Robert L Burdett, Paul Corry, Prasad Yarlagadda +2
Various medical and surgical units operate in a typical hospital and to treat their patients these units compete for infrastructure like operating rooms (OR) and ward beds. How tha…
On decomposing Betti tables and -sequences
David Cook
The Boij-Söderberg characterization decomposes a Betti table into a unique positive integral linear combination of pure diagrams. Given a module with a pure resolution, we describ…
Evaluation of Popular XAI Applied to Clinical Prediction Models: Can They be Trusted?
Aida Brankovic, David Cook, Jessica Rahman +2
The absence of transparency and explainability hinders the clinical adoption of Machine learning (ML) algorithms. Although various methods of explainable artificial intelligence (X…
Developing A Personal Decision Support Tool for Hospital Capacity Assessment and Querying
Robert L Burdett, Paul Corry, David Cook +1
This article showcases a personal decision support tool (PDST) called HOPLITE, for performing insightful and actionable quantitative assessments of hospital capacity, to support ho…
Nauty in Macaulay2
David Cook
We introduce a new Macaulay2 package, Nauty, which gives access to powerful methods on graphs provided by the software nauty by Brendan McKay. The primary motivation for accessing…
Nested colourings of graphs
David Cook
A proper vertex colouring of a graph is \emph{nested} if the vertices of each of its colour classes can be ordered by inclusion of their open neighbourhoods. Through a relation to…
Long-rising Type II Supernovae in the Zwicky Transient Facility Census of the Local Universe
Tawny Sit, Mansi M. Kasliwal, Anastasios Tzanidakis +25
SN 1987A was an unusual hydrogen-rich core-collapse supernova originating from a blue supergiant star. Similar blue supergiant explosions remain a small family of events, and are b…
Lefschetz properties of balanced 3-polytopes
David Cook, Martina Juhnke-Kubitzke, Satoshi Murai +1
In this paper, we study Lefschetz properties of Artinian reductions of Stanley-Reisner rings of balanced simplicial -polytopes. A -dimensional simplicial complex is said…
Enumerations of lozenge tilings, lattice paths, and perfect matchings and the weak Lefschetz property
David Cook, Uwe Nagel
MacMahon enumerated the plane partitions in an box. These are in bijection to lozenge tilings of a hexagon, to certain perfect matchings, and to families of n…
Enumerations deciding the weak Lefschetz property
David Cook, Uwe Nagel
We introduce a natural correspondence between artinian monomial almost complete intersections in three variables and punctured hexagonal regions. We use this correspondence to inve…
A Comparison of Star-Forming Clumps and Tidal Tails in Local Mergers and High Redshift Galaxies
Debra Meloy Elmegreen, Bruce G. Elmegreen, Bradley C. Whitmore +8
The Clusters, Clumps, Dust, and Gas in Extreme Star-Forming Galaxies (CCDG) survey with the Hubble Space Telescope includes multi-wavelength imaging of 13 galaxies less than 100 Mp…
An algebraic approach to finite projective planes
David Cook, Juan Migliore, Uwe Nagel +1
A finite projective plane, or more generally a finite linear space, has an associated incidence complex that gives rise to two natural algebras: the Stanley-Reisner ring a…
Synthetic photometry of OB star clusters with stochastically sampled IMFs: analysis of models and HST observations
Rogelio Orozco-Duarte, Aida Wofford, Alba Vidal-GarcÃa +13
We present a pilot library of synthetic NUV, U, B, V, and I photometry of star clusters with stochastically sampled IMFs and ionized gas for initial masses, , , and…
Line arrangements and configurations of points with an unusual geometric property
David Cook, Brian Harbourne, Juan Migliore +1
The SHGH conjecture proposes a solution to the question of how many conditions a general union of fat points imposes on the complete linear system of curves in of fix…
The Lefschetz properties of monomial complete intersections in positive characteristic
David Cook
Stanley proved that, in characteristic zero, all artinian monomial complete intersections have the strong Lefschetz property. We provide a positive characteristic complement to Sta…
Best Practices for Data Publication in the Astronomical Literature
Tracy X. Chen, Marion Schmitz, Joseph M. Mazzarella +42
We present an overview of best practices for publishing data in astronomy and astrophysics journals. These recommendations are intended as a reference for authors to help prepare a…
Signed lozenge tilings
David Cook, Uwe Nagel
It is well-known that plane partitions, lozenge tilings of a hexagon, perfect matchings on a honeycomb graph, and families of non-intersecting lattice paths in a hexagon are all in…
Analytical Techniques to Support Hospital Case Mix Planning
Robert L Burdett, Paul corry, David Cook +1
This article introduces analytical techniques and a decision support tool to support capacity assessment and case mix planning (CMP) approaches previously created for hospitals. Fi…
Some algebras with the weak Lefschetz property
David Cook, Uwe Nagel
Using a connection to lozenge tilings of triangular regions, we establish an easily checkable criterion that guarantees the weak Lefschetz property of a quotient by a monomial idea…
The uniform face ideals of a simplicial complex
David Cook
We define the uniform face ideal of a simplicial complex with respect to an ordered proper vertex colouring of the complex. This ideal is a monomial ideal which is generally not sq…
The M81 Group Dwarf Irregular Galaxy DDO 165. II. Connecting Recent Star Formation with ISM Structures and Kinematics
John M. Cannon, Hans P. Most, Evan D. Skillman +8
We compare the stellar populations and complex neutral gas dynamics of the M81 group dIrr galaxy DDO 165 using data from the HST and the VLA. Paper I identified two kinematically d…
The Efficacy of Utility Functions for Multicriteria Hospital Case-Mix Planning
Robert L Burdett, Paul Corry, Prasad Yarlagadda +2
A new approach to perform hospital case-mix planning (CMP) is introduced in this article. Our multi-criteria approach utilises utility functions (UF) to articulate the preferences…
Syzygy bundles and the weak Lefschetz property of almost complete intersections
David Cook, Uwe Nagel
Deciding the presence of the weak Lefschetz property often is a challenging problem. In this work an in-depth study is carried out in the case of Artinian monomial ideals with four…
The weak Lefschetz property, monomial ideals, and lozenges
David Cook, Uwe Nagel
We study the weak Lefschetz property and the Hilbert function of level Artinian monomial almost complete intersections in three variables. Several such families are shown to have t…
The strong Lefschetz property in codimension two
David Cook
Every artinian quotient of has the strong Lefschetz property if is a field of characteristic zero or is an infinite field whose characteristic is greater than the regu…
SimplicialDecomposability: a package for Macaulay 2
David Cook
We introduce a new Macaulay 2 package, SimplicialDecomposability, which works in conjunction with the extant package SimplicialComplexes in order to compute a shelling order, if on…
A Tale of 3 Dwarfs: No Extreme Cluster Formation in Extreme Star-Forming Galaxies
Rupali Chandar, Miranda Caputo, Angus Mok +8
Nearly all current simulations predict that outcomes of the star formation process, such as the fraction of stars that form in bound clusters (Gamma), depend on the intensity of st…
The M81 Group Dwarf Irregular Galaxy DDO 165. I. High Velocity Neutral Gas in a Post-Starburst System
John M. Cannon, Hans P. Most, Evan D. Skillman +8
We present new multi-configuration VLA HI spectral line observations of the M81 group dIrr post-starburst galaxy DDO 165. The HI morphology is complex, with multiple column density…
The weak Lefschetz property for monomial ideals of small type
David Cook, Uwe Nagel
In this work a combinatorial approach towards the weak Lefschetz property is developed that relates this property to enumerations of signed perfect matchings as well as to enumerat…
Elucidating Discrepancy in Explanations of Predictive Models Developed using EMR
Aida Brankovic, Wenjie Huang, David Cook +2
The lack of transparency and explainability hinders the clinical adoption of Machine learning (ML) algorithms. While explainable artificial intelligence (XAI) methods have been pro…
The Nature of Low-Density Star Formation
David Thilker, Janice Lee, Peter Capak +12
How do stars manage to form within low-density, HI-dominated gas? Such environments provide a laboratory for studying star formation with physical conditions distinct from starburs…
Cohen-Macaulay graphs and face vectors of flag complexes
David Cook, Uwe Nagel
We introduce a construction on a flag complex that, by means of modifying the associated graph, generates a new flag complex whose -factor is the face vector of the original com…
Hyperplane sections and the subtlety of the Lefschetz properties
David Cook, Uwe Nagel
The weak and strong Lefschetz properties are two basic properties that Artinian algebras may have. Both Lefschetz properties may vary under small perturbations or changes of the ch…
Electromagnetic Follow-up of the Sub-Solar Mass Gravitational Wave Candidate S251112cm: Kilonova Constraints and a Coincident IIb Supernova
Xander J. Hall, Tomas Ahumada, Julius Gassert +25
On November 12th, 2025 the LIGO--Virgo--KAGRA (LVK) collaboration reported gravitational waves (GWs) from a compact object merger candidate (S251112cm) with at least one sub-solar…
Partially ordered sets in Macaulay2
David Cook, Sonja Mapes, Gwyneth Whieldon
We introduce the package Posets for Macaulay2. This package provides a data structure and the necessary methods for working with partially ordered sets, also called posets. In part…
Volumetric rates of Luminous Red Novae and Intermediate Luminosity Red Transients with the Zwicky Transient Facility
Viraj R. Karambelkar, Mansi M. Kasliwal, Nadejda Blagorodnova +27
Luminous red novae (LRNe) are transients characterized by low luminosities and expansion velocities, and are associated with mergers or common envelope ejections in stellar binarie…