Publications (50)
The TEMPO Survey II: Science Cases Leveraged from a Proposed 30-Day Time Domain Survey of the Orion Nebula with the Nancy Grace Roman Space Telescope
Melinda Soares-Furtado, Mary Anne Limbach, Andrew Vanderburg +26
The TEMPO (Transiting Exosatellites, Moons, and Planets in Orion) Survey is a proposed 30-day observational campaign using the Nancy Grace Roman Space Telescope. By providing deep,…
Keck/NIRC2 Imaging of the Warped, Asymmetric Debris Disk around HD 32297
Thayne Currie, Timothy J. Rodigas, John Debes +8
We present Keck/NIRC2 band high-contrast coronagraphic imaging of the luminous debris disk around the nearby, young A star HD 32297 resolved at a projected separation of $r…
Chromatic numbers with open and nonzero local modular constraints
Daniel Herden, Jonathan Meddaugh, Mark R. Sepanski +9
In this paper, we explore chromatic numbers subject to various local modular constraints. For fixed , we consider proper integer colorings of a graph for which the closed an…
Evryscope science: exploring the potential of all-sky gigapixel-scale telescopes
Nicholas M. Law, Octavi Fors, Jeffrey Ratzloff +11
Low-cost mass-produced sensors and optics have recently made it feasible to build telescope arrays which observe the entire accessible sky simultaneously. In this article we discus…
Binary Formation in the Orion Nebula Cluster: Exploring the Sub-stellar Limit
Matthew De Furio, Michael R. Meyer, Megan Reiter +3
We present results constraining the multiplicity of the very low mass stars and sub-stellar objects in the Orion Nebula Cluster (ONC). Our sample covers primary masses 0.012-0.1M$_…
Disk Material Inflates Gaia RUWE Values in Single Stars
Shannon Fitton, Benjamin Tofflemire, Adam Kraus
An understanding of the dynamical evolution of binary star systems, and their effects on stellar and planetary evolution, requires well-characterized binary populations across stel…
High-Contrast Imaging at First-Light of the GMT: The Preliminary Design of GMagAO-X
Jared R. Males, Laird M. Close, Sebastiaan Y. Haffert +15
We present the preliminary design of GMagAO-X, the first-light high-contrast imager planned for the Giant Magellan Telescope. GMagAO-X will realize the revolutionary increase in sp…
The Close Companion Mass-Ratio Distribution of Intermediate-Mass Stars
Kevin Gullikson, Adam Kraus, Sarah Dodson-Robinson
Binary stars and higher-order multiple systems are an ubiquitous outcome of star formation, especially as the system mass increases. The companion mass-ratio distribution is a uniq…
A New Look at an Old Cluster: The Membership, Rotation, and Magnetic Activity of Low-Mass Stars in the 1.3-Gyr-Old Open Cluster NGC 752
Marcel Agüeros, Emily Bowsher, John Bochanski +8
The nearby open cluster NGC 752 presents a rare opportunity to study stellar properties at ages >1 Gyr. However, constructing a membership catalog for it is challenging; most surve…
Data-Driven Modeling of Coarse Mesh Turbulence for Reactor Transient Analysis Using Convolutional Recurrent Neural Networks
Yang Liu, Rui Hu, Adam Kraus +2
Advanced nuclear reactors often exhibit complex thermal-fluid phenomena during transients. To accurately capture such phenomena, a coarse-mesh three-dimensional (3-D) modeling capa…
Determining the Host Stars of Planets in Binary Star Systems with Asterodensity Profiling: Investigating the Canonical Radius Gap
Nathanael Burns-Watson, Kendall Sullivan, Adam Kraus
Over the past 30 years, thousands of exoplanets have been discovered, revealing detailed demographics of planets outside the Solar System. One of the most dramatic features of the…
Direct Spectral Detection: An Efficient Method to Detect and Characterize Binary Systems
Kevin Gullikson, Adam Kraus, Sarah Dodson-Robinson +6
Young, intermediate-mass stars are experiencing renewed interest as targets for direct-imaging planet searches. However, these types of stars are part of multiple systems more ofte…
Demographics of the M-star Multiple Population in the Orion Nebula Cluster
Matthew De Furio, Christopher Liu, Michael R. Meyer +4
We present updated results constraining multiplicity demographics for the stellar population of the Orion Nebula Cluster (ONC, a high-mass, high-density star-forming region), acros…
On the -hull number and infecting times of generalized Petersen graphs
Daniel Herden, Jonathan Meddaugh, Mark Sepanski +8
The -hull number of a graph is the minimum cardinality of an infecting set of vertices that will eventually infect the entire graph under the rule that uninfected nodes become…
Bridging the Gap Between Stars and Planets: The Formation and Early Evolution of Brown Dwarfs
Subhanjoy Mohanty, Adam Burgasser, Gilles Chabrier +17
This White Paper, submitted to the National Academy of Sciences' Astro2010 Decadal Review Committee, focuses on 2 central themes in the study of young brown dwarfs -- their formati…
The IGRINS YSO Survey I. Stellar parameters of pre-main sequence stars in Taurus-Auriga
Ricardo López-Valdivia, Kimberly R. Sokal, Gregory N. Mace +19
We present fundamental parameters for 110 canonical K- & M-type (1.30.13) Taurus-Auriga young stellar objects (YSOs). The analysis produces a simultaneous determination…
Direct Numerical Simulation of Fluid Flow in a 5x5 Square Rod Bundle Using Nek5000
Adam Kraus, Elia Merzari, Thomas Norddine +2
Rod bundle flows are commonplace in nuclear engineering, and are present in light water reactors (LWRs) as well as other more advanced concepts. Inhomogeneities in the bundle cross…
Chromatic numbers with closed local modular constraints
Daniel Herden, Jonathan Meddaugh, Mark R. Sepanski +9
Generalizing the notion of odd-sum colorings, a -labeling of a graph is called a closed coloring with remainder if the closed neighborhood label sum of ea…
Hot Stars With Cool Companions
Kevin Gullikson, Adam Kraus, Sarah Dodson-Robinson
Young intermediate-mass stars have become high-priority targets for direct-imaging planet searches following the recent discoveries of planets orbiting e.g. HR 8799 and Beta Pictor…
Sites of Planet Formation in Binary Systems. II. Double the Disks in DF Tau
Taylor Kutra, Lisa Prato, Benjamin M Tofflemire +8
This article presents the latest results of our ALMA program to study circumstellar disk characteristics as a function of orbital and stellar properties in a sample of young binary…
The IGRINS YSO Survey III: Stellar parameters of pre-main sequence stars in Ophiuchus and Upper Scorpius
Ricardo López-Valdivia, Gregory N. Mace, Eunkyu Han +9
We used the Immersion GRating Infrared Spectrometer (IGRINS) to determine fundamental parameters for 61 K- and M-type young stellar objects (YSOs) located in the Ophiuchus and Uppe…
New Perspectives on Torsional Rigidity and Polynomial Approximations of z-bar
Adam Kraus, Brian Simanek
We consider polynomial approximations of z-bar to better understand the torsional rigidity of polygons. Our main focus is on low degree approximations and associated extremal probl…
The JWST Early Release Science Program for the Direct Imaging & Spectroscopy of Exoplanetary Systems
Sasha Hinkley, Aarynn L. Carter, Shrishmoy Ray +83
The direct characterization of exoplanetary systems with high contrast imaging is among the highest priorities for the broader exoplanet community. As large space missions will be…
Correcting for Telluric Absorption: Methods, Case Studies, and Release of the TelFit Code
Kevin Gullikson, Sarah Dodson-Robinson, Adam Kraus
Ground-based astronomical spectra are contaminated by the Earth's atmosphere to varying degrees in all spectral regions. We present a Python code that can accurately fit a model to…
Fundamental Properties of Low-Mass Stars and Brown Dwarfs
Michael C. Liu, Keivan G. Stassun, France Allard +7
Precise measurements of the fundamental properties of low-mass stars and brown dwarfs are key to understanding the physics underlying their formation and evolution. While there has…
A giant planet transiting a 3-Myr protostar with a misaligned disk
Madyson G. Barber, Andrew W. Mann, Andrew Vanderburg +35
Astronomers have found more than a dozen planets transiting 10-40 million year old stars, but even younger transiting planets have remained elusive. A possible reason for the lack…
SPYGLASS. IV. New Stellar Survey of Recent Star Formation within 1 kpc
Ronan Kerr, Adam Kraus, Aaron Rizzuto
Young stellar populations provide a powerful record that traces millions of years of star formation history in the solar neighborhood. Using a revised form of the SPYGLASS young st…
Testing the Metal of Late-Type Kepler Planet Hosts with Iron-Clad Methods
Andrew W. Mann, Eric Gaidos, Adam Kraus +1
It has been shown that F, G, and early K dwarf hosts of Neptune-sized planets are not preferentially metal-rich. However, it is less clear whether the same holds for late K and M d…
Kepler-445, Kepler-446 and the Occurrence of Compact Multiples Orbiting Mid-M Dwarf Stars
Philip S. Muirhead, Andrew W. Mann, Andrew Vanderburg +7
We confirm and characterize the exoplanetary systems Kepler-445 and Kepler-446: two mid-M dwarf stars, each with multiple, small, short-period transiting planets. Kepler-445 is a m…
Sparse Aperture Masking (SAM) at NAOS/CONICA on the VLT
Peter Tuthill, Sylvestre Lacour, Paola Amico +8
The new operational mode of aperture masking interferometry has been added to the CONICA camera which lies downstream of the Adaptive Optics (AO) corrected focus provided by NAOS o…
A Search for Intermediate Separation Low Mass Binaries in the Orion Nebula Cluster
Matthew De Furio, Megan Reiter, Michael Meyer +3
We present the results of a binary population study in the Orion Nebula Cluster (ONC) using archival Hubble Space Telescope (HST) data obtained with the Advanced Camera for Surveys…
Origin of Interstellar Object A/2017 U1 in a Nearby Young Stellar Association?
Eric Gaidos, Jonathan P. Williams, Adam Kraus
We suggest that the kinematics and properties of interstellar object A/2017 U1 point towards its formation in a protoplanetary disk in the ~45 Myr-old Carina or Columba young stell…
Undetected Binary Stars Cause an Observed Mass Dependent Age Gradient in Upper Scorpius
Kendall Sullivan, Adam Kraus
Young stellar associations represent a key site for the study of star formation, but to accurately compare observations to models of stellar evolution, the age of an association mu…
The Formation and Evolution of Planetary Systems: The Search for and Characterization of Young Planets
Charles Beichman, Isabelle Baraffe, Christopher Crockett +16
Despite the revolution in our knowledge resulting from the detection of planets around mature stars, we know almost nothing about planets orbiting young stars because rapid rotatio…
Vertex-edge marking score of certain triangular lattices
Daniel Herden, Jonathan Meddaugh, Mark Sepanski +8
The vertex-edge marking game is played between two players on a graph, , with one player marking vertices and the other marking edges. The players want to minimize/maximiz…
Bounded Connected Components of Polynomial Lemniscates
Adam Kraus, Brian Simanek
We consider families of polynomial lemniscates in the complex plane and determine if they bound a Jordan domain. This allows us to find examples of regions for which we can calcula…
The Gemini NICI Planet-Finding Campaign: Discovery of a Multiple System Orbiting the Young A Star HD 1160
Eric L. Nielsen, Michael C. Liu, Zahed Wahhaj +22
We report the discovery by the Gemini NICI Planet-Finding Campaign of two low-mass companions to the young A0V star HD 1160 at projected separations of 81 +/- 5 AU (HD 1160 B) and…
Close companions around young stars
Marina Kounkel, Kevin Covey, Maxwell Moe +26
Multiplicity is a fundamental property that is set early during stellar lifetimes, and it is a stringent probe of the physics of star formation. The distribution of close companion…
The Young Substellar Companion ROXs 12 B: Near-Infrared Spectrum, System Architecture, and Spin-Orbit Misalignment
Brendan Bowler, Adam Kraus, Marta Bryan +8
ROXs 12 (2MASS J16262803-2526477) is a young star hosting a directly imaged companion near the deuterium-burning limit. We present a suite of spectroscopic, imaging, and time-serie…
Touchstone Stars: Highlights from the Cool Stars 18 Splinter Session
Andrew W. Mann, Adam Kraus, Tabetha Boyajian +11
We present a summary of the splinter session on "touchstone stars" -- stars with directly measured parameters -- that was organized as part of the Cool Stars 18 conference. We disc…
A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18
Ian J. M. Crossfield, William Waalkes, Elisabeth R. Newton +57
Planets occur most frequently around cool dwarfs, but only a handful of specific examples are known to orbit the latest-type M stars. Using TESS photometry, we report the discovery…
Stellar Multiplicity
Gaspard Duchêne, Adam Kraus
Stellar multiplicity is an ubiquitous outcome of the star formation process. Characterizing the frequency and main characteristics of multiple systems and their dependencies on pri…
An Observational Perspective of Transitional Disks
Catherine Espaillat, James Muzerolle, Joan Najita +7
Transitional disks are objects whose inner disk regions have undergone substantial clearing. The Spitzer Space Telescope produced detailed spectral energy distributions (SEDs) of t…
Keck NIRSPEC Radial Velocity Observations of Late-M dwarfs
Angelle Tanner, Russel White, John Bailey +5
We present the results of an infrared spectroscopic survey of 23 late-M dwarfs with the NIRSPEC echelle spectrometer on the Keck II telescope. Using telluric lines for wavelength c…
Towards Direct Numerical Simulation of a 5x5 Rod Bundle
Adam Kraus, Elia Merzari, Thomas Norddine +2
Rod bundle flows are prevalent in nuclear engineering for both light water reactors (LWR) and advanced reactor concepts. Unlike canonical channel flow, the flow in rod bundles pres…
The Demographics and Atmospheres of Giant Planets with the ELTs
Brendan Bowler, Steph Sallum, Alan Boss +23
Gas giants are the most readily detectable exoplanets but fundamental questions about their system architectures, formation, migration, and atmospheres have been unanswerable with…
The Factory and The Beehive I. Rotation Periods For Low-Mass Stars in Praesepe
Marcel Agüeros, Kevin Covey, Jenna Lemonias +11
Stellar rotation periods measured from single-age populations are critical for investigating how stellar angular momentum content evolves over time, how that evolution depends on m…
TOI-4010: A System of Three Large Short-Period Planets With a Massive Long-Period Companion
Michelle Kunimoto, Andrew Vanderburg, Chelsea X. Huang +53
We report the confirmation of three exoplanets transiting TOI-4010 (TIC-352682207), a metal-rich K dwarf observed by TESS in Sectors 24, 25, 52, and 58. We confirm these planets wi…
The TEMPO Survey I: Predicting Yields of the Transiting Exosatellites, Moons, and Planets from a 30-day Survey of Orion with the Nancy Grace Roman Space Telescope
Mary Anne Limbach, Melinda Soares-Furtado, Andrew Vanderburg +12
We present design considerations for the Transiting Exosatellites, Moons, and Planets in Orion (TEMPO) Survey with the Nancy Grace Roman Space Telescope. This proposed 30-day surve…
Development of a Data-driven Turbulence Model for 3d Thermal Stratification Simulation during Reactor Transients
Yangmo Zhu, Nam Dinh, Rui Hu +1
SAM, a plant-level system analysis tool for advanced reactors (SFR, LFR, MSR/FHR) is under development at Argonne. As a modern system code, SAM aims to improve the predictions of 3…