Publications (27)
Flow characterisation and power consumption in an inline high shear rotor-stator mixer using CFD
Vipin Michael, Umair Ahmed, Mahmoud Assad +2
The aim of this paper is two-fold: (1) to provide a detailed investigation of the turbulent flow in an inline high-shear rotor stator mixer; (2) to provide a comparison of two diff…
Coronal Dimming as a Proxy for Stellar Coronal Mass Ejections
Meng Jin, Mark C. M. Cheung, Marc L. DeRosa +6
Solar coronal dimmings have been observed extensively in the past two decades and are believed to have close association with coronal mass ejections (CMEs). Recent study found that…
STROBE-X: X-ray Timing and Spectroscopy on Dynamical Timescales from Microseconds to Years
Paul S. Ray, Zaven Arzoumanian, David Ballantyne +155
We present the Spectroscopic Time-Resolving Observatory for Broadband Energy X-rays (STROBE-X), a probe-class mission concept selected for study by NASA. It combines huge collectin…
Can Proton Beam Heating Flare Models Explain Sunquakes?
Viacheslav Sadykov, John Stefan, Alexander Kosovichev +4
SDO/HMI observations reveal a class of solar flares with substantial energy and momentum impacts in the photosphere, concurrent with white-light emission and helioseismic responses…
Discovery of multi-temperature coronal mass ejection signatures from a young solar analogue
Kosuke Namekata, Kevin France, Jongchul Chae +14
Coronal mass ejections (CMEs) on the early Sun may have profoundly influenced the planetary atmospheres of early Solar System planets. Flaring young solar analogues serve as excell…
Development of Integral Field Spectrographs to Revolutionize Spectroscopic Observations of Solar Flares and other Energetic Solar Eruptions
Haosheng Lin, Tetsu Anan, Gianna Cauzzi +9
The Sun's proximity offers us a unique opportunity to study in detail the physical processes on a star's surface; however, the highly dynamic nature of the stellar surface -- in pa…
EUV influences on exoplanet atmospheric stability and evolution
Allison Youngblood, Kevin France, Tommi Koskinen +15
The planetary effective surface temperature alone is insufficient to characterize exoplanet atmospheres and their stability or evolution. Considering the star-planet system as a wh…
Predicting the distribution of yield-stress fluids in branched pipe manifolds
Elliott Sutton, Waldo Rosales Trujillo, Adam Kowalski +2
We develop a one-dimensional network model to predict the steady-state distribution of yield-stress fluids in branched pipe manifolds under wall-slip conditions. The model accounts…
TOI-2015b: A Warm Neptune with Transit Timing Variations Orbiting an Active mid M Dwarf
Sinclaire E. Jones, Gudmundur Stefansson, Kento Masuda +29
We report the discovery of a close-in () warm Neptune with clear transit timing variations (TTVs) orbiting the nearby ($d=47.3\:\mathrm{pc}…
Evolution of Flare Activity in GKM Stars Younger than 300 Myr over Five Years of TESS Observations
Adina D. Feinstein, Darryl Z. Seligman, Kevin France +2
Stellar flares are short-duration ( hours) bursts of radiation associated with surface magnetic reconnection events. Stellar magnetic activity generally decreases as a function…
EUV observations of cool dwarf stars
Allison Youngblood, Jeremy Drake, James Mason +15
The EUV (100-912 Ã ) is a spectral region notoriously difficult to observe due to attenuation by neutral hydrogen gas in the interstellar medium. Despite this, hundreds to thousand…
Spectroscopic analysis and RHD modeling of the first Ca II H and H-epsilon flare spectra from DKIST/ViSP
Cole Tamburri, Adam Kowalski, Gianna Cauzzi +7
We analyze decay phase observations of the GOES class C6.7 flare SOL2022-08-19T20:31 by the Visible Spectropolarimeter (ViSP) on the National Science Foundation's Daniel K. Inouye…
A comparison between the FENE-P and sPTT constitutive models in Large Amplitude Oscillatory Shear (LAOS)
Thomas P John, Robert J Poole, Adam Kowalski +1
The FENE-P and sPTT viscoelastic models are widely used for modelling of complex fluids. Although they are derived from distinct micro-structural theories, these models can become…
Exploring impulsive solar magnetic energy release and particle acceleration with focused hard X-ray imaging spectroscopy
Steven Christe, Samuel Krucker, Lindsay Glesener +37
How impulsive magnetic energy release leads to solar eruptions and how those eruptions are energized and evolve are vital unsolved problems in Heliophysics. The standard model for…
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.…
Integrating knowledge-guided symbolic regression and model-based design of experiments to automate process flow diagram development
Alexander W. Rogers, Amanda Lane, Cesar Mendoza +4
New products must be formulated rapidly to succeed in the global formulated product market; however, key product indicators (KPIs) can be complex, poorly understood functions of th…
NEID Reveals that The Young Warm Neptune TOI-2076 b Has a Low Obliquity
Robert C. Frazier, Gudmundur Stefansson, Suvrath Mahadevan +27
TOI-2076 b is a sub-Neptune-sized planet () that transits a young () bright () K-dwarf hosting a system of three transiting…
The F-CHROMA grid of 1D RADYN flare models
Mats Carlsson, Lyndsay Fletcher, Joel Allred +6
Context: Solar flares are the result of the sudden release of magnetic energy in the corona. Much of this energy goes into accelerating charged particles to high velocity. These pa…
Non-detection of Helium in the upper atmospheres of TRAPPIST-1b, e and f
Vigneshwaran Krishnamurthy, Teruyuki Hirano, Guðmundur Stefánsson +37
We obtained high-resolution spectra of the ultra-cool M-dwarf TRAPPIST-1 during the transit of its planet `b' using two high dispersion near-infrared spectrographs, IRD instrument…
The Mega-MUSCLES Spectral Energy Distribution Of TRAPPIST-1
David J. Wilson, Cynthia S. Froning, Girish M. Duvvuri +19
We present a 5A-100um Spectral Energy Distribution (SED) of the ultracool dwarf star TRAPPIST-1, obtained as part of the Mega-MUSCLES Treasury Survey. The SED combines ultraviolet…
Enigmatic Line Broadening During Solar Flares: Magnetic Field Broadening?
Thomas Gomez, Adam Kowalski, Cole Tamburri +2
The origin of the extreme broadening observed in chromospheric metal lines during solar and stellar flares, particularly Mg II h&k and Ca II H&K, remains poorly understood. These l…
The MUSCLES Treasury Survey IV: Scaling Relations for Ultraviolet, Ca II K, and Energetic Particle Fluxes from M Dwarfs
Allison Youngblood, Kevin France, R. O. Parke Loyd +18
Characterizing the UV spectral energy distribution (SED) of an exoplanet host star is critically important for assessing its planet's potential habitability, particularly for M dwa…
Spectral signatures of chromospheric condensation in a major solar flare
David R. Graham, Gianna Cauzzi, Luca Zangrilli +3
We study the evolution of chromospheric line and continuum emission during the impulsive phase of the X-class SOL2014-09-10T17:45 solar flare. We extend previous analyses of this f…
The Focusing Optics X-ray Solar Imager (FOXSI)
Steven Christe, Meriem Alaoui, Joel Allred +26
FOXSI is a direct-imaging, hard X-ray (HXR) telescope optimized for solar flare observations. It detects hot plasma and energetic electrons in and near energy release sites in the…
DRAFTS: A Deep, Rapid Archival Flare Transient Search in the Galactic Bulge
Rachel A. Osten, Adam Kowalski, Kailash Sahu +1
We utilize the Sagittarius Window Eclipsing Extrasolar Planet Search (SWEEPS) HST/ACS dataset for a Deep Rapid Archival Flare Transient Search (DRAFTS) to constrain the flare rate…
A Very Bright, Very Hot, and Very Long Flaring Event from the M Dwarf Binary System DG CVn
Rachel A. Osten, Adam Kowalski, Stephen A. Drake +10
On April 23, 2014, the Swift satellite responded to a hard X-ray transient detected by its Burst Alert Telescope, which turned out to be a stellar flare from a nearby, young M dwar…
Ab initio calculation of anisotropic interfacial excess free energies
Axel van de Walle, Chirranjeevi Balaji Gopal, Steve Demers +5
We describe a simple method to determine, from ab initio calculations, the complete orientation-dependence of interfacial free energies in solid-state crystalline systems. We illus…