Publications (26)
A direct solver with O(N) complexity for integral equations on one-dimensional domains
Adrianna Gillman, Patrick Young, Per-Gunnar Martinsson
An algorithm for the direct inversion of the linear systems arising from Nystrom discretization of integral equations on one-dimensional domains is described. The method typically…
Supernovae Shock Breakout/Emergence Detection Predictions for a Wide-Field X-ray Survey
Amanda J. Bayless, Chris Fryer, Peter J. Brown +7
There are currently many large-field surveys operational and planned including the powerful Vera C. Rubin Observatory Legacy Survey of Space and Time. These surveys will increase t…
Nucleosynthetic Yields from "Collapsars"
Gabriel Rockefeller, Christopher L. Fryer, Patrick Young +8
The "collapsar" engine for gamma-ray bursts invokes as its energy source the failure of a normal supernova and the formation of a black hole. Here we present the results of the fir…
LSST Science Book, Version 2.0
LSST Science Collaboration, Paul A. Abell, Julius Allison +245
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of the exciting science opportunities of the next decade.…
NuGrid: s process in massive stars
Raphael Hirschi, Urs Frischknecht, F. -K. Thielemann +10
The s-process production in massive stars at very low metallicities is expected to be negligible due to the low abundance of the neutron source 22Ne, to primary neutron poisons and…
Stellar Characterization Necessary to Define Holistic Planetary Habitability
Natalie Hinkel, Irina Kitiashvili, Patrick Young +1
It is a truism within the exoplanet field that "to know the planet, you must know the star." This pertains to the physical properties of the star (i.e. mass, radius, luminosity, ag…
The Reddening Towards Cassiopeia A's Supernova: Constraining the 56Ni Yield
Kristoffer A. Eriksen, David Arnett, Donald W. McCarthy +1
We present new reddening measurements towards the young supernova remnant Cassiopeia A, using two techniques not previously applied to this object. Our observations of the near-inf…
A Stellar Magnesium to Silicon ratio in the atmosphere of an exoplanet
Jorge A. Sanchez, Peter C. B. Smith, Krishna Kanumalla +17
The elemental compositions of exoplanets encode information about their formation environments and internal structures. While volatile ratios such as carbon-to-oxygen (C/O) are use…
Catching Element Formation In The Act
Chris L. Fryer, Frank Timmes, Aimee L. Hungerford +216
Gamma-ray astronomy explores the most energetic photons in nature to address some of the most pressing puzzles in contemporary astrophysics. It encompasses a wide range of objects…
Complete nucleosynthesis calculations for low-mass stars from NuGrid
Marco Pignatari, Falk Herwig, Michael Bennett +8
Many nucleosynthesis and mixing processes of low-mass stars as they evolve from the Main Sequence to the thermal-pulse Asymptotic Giant Branch phase (TP-AGB) are well understood (a…
Astro2020 APC White Paper: Accessible Astronomy: Policies, Practices, and Strategies to Increase Participation of Astronomers with Disabilities
Alicia Aarnio, Nicholas Murphy, Karen Knierman +14
(Abridged) In this white paper, we outline the major barriers to access within the educational and professional practice of astronomy. We present current best practices for inclusi…
NuGrid: Toward High Precision Double-Degenerate Merger Simulations with SPH in 3D
Steven Diehl, Christopher L. Fryer, Aimee Hungerford +11
We present preliminary results from recent high-resolution double-degenerate merger simulations with the Smooth Particle Hydrodynamics (SPH) technique. We put particular emphasis o…
Neural Machine Translation Inspired Binary Code Similarity Comparison beyond Function Pairs
Fei Zuo, Xiaopeng Li, Patrick Young +3
Binary code analysis allows analyzing binary code without having access to the corresponding source code. A binary, after disassembly, is expressed in an assembly language. This in…
Continuous Habitable Zone Metric for Prioritizing Habitable Worlds Observatory Targets
Austin Ware, Patrick Young
Future direct imaging space telescopes, such as NASA's Habitable Worlds Observatory (HWO), will be the first capable of both detecting and characterizing terrestrial exoplanets in…
Nucleosynthesis simulations for a wide range of nuclear production sites from NuGrid
Falk Herwig, Michael Bennett, Steven Diehl +8
Simulations of nucleosynthesis in astrophysical environments are at the intersection of nuclear physics reaction rate research and astrophysical applications, for example in the ar…
44Ti and 56Ni in core-collapse supernovae
Georgios Magkotsios, Francis X. Timmes, Michael Wiescher +9
We investigate the physical conditions where 44Ti and 56Ni are created in core-collapse supernovae. In this preliminary work we use a series of post-processing network calculations…
Spatial Distribution of Nucleosynthesis Products in Cassiopeia A: Comparison Between Observations and 3D Explosion Models
Patrick Young, Carola I. Ellinger, Francis X. Timmes +10
We examine observed heavy element abundances in the Cassiopeia A supernova remnant as a constraint on the nature of the Cas A supernova. We compare bulk abundances from 1D and 3D e…
ASCENT - A balloon-borne hard X-ray imaging spectroscopy telescope using transition edge sensor microcalorimeter detectors
Fabian Kislat, Daniel Becker, Douglas Bennett +26
Core collapse supernovae are thought to be one of the main sources in the galaxy of elements heavier than iron. Understanding the origin of the elements is thus tightly linked to o…
An Interdisciplinary Perspective on Elements in Astrobiology: From Stars to Planets to Life
Natalie Hinkel, Hilairy Hartnett, Carey Lisse +1
Stellar elemental abundances direct impact planetary interior structure and mineralogy, surface composition, and life. However, the different communities that are necessary for pla…
Difficulties in Probing Nuclear Physics: A Study of Ti and Ni
Aimee Hungerford, Christopher L. Fryer, Francis X. Timmes +8
The nucleosynthetic yield from a supernova explosion depends upon a variety of effects: progenitor evolution, explosion process, details of the nuclear network, and nuclear rates.…
The Orbital Light Curve of Aquila X-1
William F. Welsh, Edward L. Robinson, Patrick Young
We obtained R- and I-band CCD photometry of the soft X-ray transient/neutron- star binary Aql X-1 in 1998 June while it was at quiescence. We find that its light curve is dominated…
The carbon atom in intense magnetic fields
Anand Thirumalai, Steven J. Desch, Patrick Young
The energy levels of the first few low-lying states of carbon in intense magnetic fields upwards of T are calculated in this study. We extend our previously employed…
Nucleosynthesis Calculations from Core-Collapse Supernovae
Christopher L. Fryer, Patrick Young, Michael Bennett +8
We review some of the uncertainties in calculating nucleosynthetic yields, focusing on the explosion mechanism. Current yield calculations tend to either use a piston, energy injec…
Exoplanet Diversity in the Era of Space-based Direct Imaging Missions
Ravi Kopparapu, Eric Hebrard, Rus Belikov +55
This whitepaper discusses the diversity of exoplanets that could be detected by future observations, so that comparative exoplanetology can be performed in the upcoming era of larg…
An efficient and highly accurate solver for multi-body acoustic scattering problems involving rotationally symmetric scatterers
Sijia Hao, Per-Gunnar Martinsson, Patrick Young
A numerical method for solving the equations modeling acoustic scattering is presented. The method is capable of handling several dozen scatterers, each of which is several wave-le…
Continuous Habitable Zones: Using Bayesian Methods to Prioritize Characterization of Potentially Habitable Worlds
Austin Ware, Patrick Young, Amanda Truitt +1
The number of potentially habitable planets continues to increase, but we lack the time and resources to characterize all of them. With 30 known potentially habitable planets…