Publications (31)
s-Process Abundances in Planetary Nebulae
Brian Sharpee, Yong Zhang, Robert Williams +5
The s-process should occur in all but the lower mass progenitor stars of planetary nebulae, and this should be reflected in the chemical composition of the gas which is expelled to…
A survey for variable young stars with small telescopes: VI -- Analysis of the outbursting Be stars NSW284, Gaia19eyy, and VES263
Dirk Froebrich, Lynne A. Hillenbrand, Carys Herbert +44
This paper is one in a series reporting results from small telescope observations of variable young stars. Here, we study the repeating outbursts of three likely Be stars based on…
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…
Independent Emission and Absorption Abundances for Planetary Nebulae
Robert Williams, Edward B. Jenkins, Jack A. Baldwin +4
Emission-line abundances have been uncertain for more than a decade due to unexplained discrepancies in the relative intensities of the forbidden lines and weak permitted recombina…
A survey for variable young stars with small telescopes: II -- Mapping a protoplanetary disk with stable structures at 0.15 AU
Jack J. Evitts, Dirk Froebrich, Aleks Scholz +57
The HOYS citizen science project conducts long term, multifilter, high cadence monitoring of large YSO samples with a wide variety of professional and amateur telescopes. We presen…
Understanding Repository Growth at the University of North Texas: A Case Study
Mark Phillips, Lauren Ko
Over the past decade the University of North Texas Libraries (UNTL) has developed a sizable digital library infrastructure for use in carrying out its core mission to the students,…
Evidence for a Spectroscopic Sequence Among SNe Ia
Peter Nugent, Mark Phillips, E. Baron +2
In this Letter we present evidence for a spectral sequence among Type Ia supernovae (SNe Ia). The sequence is based on the systematic variation of several features seen in the near…
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…
A survey for variable stars with small telescopes: IX -- Evolution of Spot Properties on YSOs in IC5070
Carys Herbert, Dirk Froebrich, Siegfried Vanaverbeke +45
We present spot properties on 32 periodic young stellar objects in IC 5070. Long term, 5 yr, light curves in the , , and -bands are obtained through the HOYS (Huntin…
Kartta Labs: Collaborative Time Travel
Sasan Tavakkol, Feng Han, Brandon Mayer +4
We introduce the modular and scalable design of Kartta Labs, an open source, open data, and scalable system for virtually reconstructing cities from historical maps and photos. Kar…
Expanding the parameter space of 2002es-like type Ia supernovae: on the underluminous ASASSN-20jq / SN 2020qxp
Subhash Bose, Maximilian D. Stritzinger, Chris Ashall +23
We present optical photometric and spectroscopic observations of the peculiar Type Ia supernova ASASSN-20jq/SN 2020qxp. It is a low-luminosity object with a peak absolute magnitude…
X-SHYNE: X-Shooter spectra of young exoplanet analogs II. Presentation and analysis of the full library
Simon Petrus, Gaël Chauvin, Mickaël Bonnefoy +29
The X-SHYNE library is a homogeneous sample of 43 medium-resolution (R=8000) infrared (0.3-2.5um) spectra of young (<500Myr), low-mass (<20Mjup), and cold (Teff=600-2000K) isolated…
Identifying Documents In-Scope of a Collection from Web Archives
Krutarth Patel, Cornelia Caragea, Mark Phillips +1
Web archive data usually contains high-quality documents that are very useful for creating specialized collections of documents, e.g., scientific digital libraries and repositories…
A survey for variable young stars with small telescopes: IV -- Rotation Periods of YSOs in IC5070
Dirk Froebrich, Efthymia Derezea, Aleks Scholz +50
Studying rotational variability of young stars is enabling us to investigate a multitude of properties of young star-disk systems. We utilise high cadence, multi-wavelength optical…
GovScape: A Public Multimodal Search System for 70 Million Pages of Government PDFs
Ying-Hsiang Huang, Claire Gong, Shreya Shaji +10
Efforts over the past three decades have produced web archives containing billions of webpage snapshots and petabytes of data. The End of Term Web Archive alone contains, among oth…
Uniform Forward-Modeling Analysis of Ultracool Dwarfs. III. Late-M and L Dwarfs in Young Moving Groups, the Pleiades, and the Hyades
Spencer A. Hurt, Michael C. Liu, Zhoujian Zhang +5
We present a uniform forward-modeling analysis of 90 late-M and L dwarfs in nearby young (~ Myr) moving groups, the Pleiades, and the Hyades using low-resolution ($R\approx…
A magnetotelluric instrument for probing the interiors of Europa and other worlds
Robert Grimm, Ton Nguyen, Steve Persyn +8
One objective of a lander mission to Jupiter's icy moon Europa is to detect liquid water within 30 km as well as characterizing the subsurface ocean. In order to satisfy this objec…
Analyzing the Persistence of Referenced Web Resources with Memento
Robert Sanderson, Mark Phillips, Herbert Van de Sompel
In this paper we present the results of a study into the persistence and availability of web resources referenced from papers in scholarly repositories. Two repositories with diffe…
The Distance to NGC 1316 (Fornax A) From Observations of Four Type Ia Supernovae
Maximilian Stritzinger, Chris Burns, Mark Phillips +13
The giant elliptical galaxy NGC 1316 (Fornax A) is a well-studied member of the Fornax Cluster and a prolific producer of Type Ia supernovae, having hosted four observed events sin…
A survey for variable young stars with small telescopes: VIII -- Properties of 1687 Gaia selected members in 21 nearby clusters
Dirk Froebrich, Aleks Scholz, Justyn Campbell-White +60
The Hunting Outbursting Young Stars (HOYS) project performs long-term, optical, multi-filter, high cadence monitoring of 25 nearby young clusters and star forming regions. Utilisin…
Rising from the Ashes: Mid-Infrared Re-Brightening of the Impostor SN 2010da in NGC 300
Ryan M. Lau, Mansi M. Kasliwal, Howard E. Bond +16
We present multi-epoch mid-infrared (IR) photometry and the optical discovery observations of the "impostor" supernova (SN) 2010da in NGC 300 using new and archival Spitzer Space T…
Towards a Practical Virtual Office for Mobile Knowledge Workers
Eyal Ofek, Jens Grubert, Michel Pahud +2
As more people work from home or during travel, new opportunities and challenges arise around mobile office work. On one hand, people may work at flexible hours, independent of tra…
New HST Observations of High Velocity Lyman Alpha and Balmer Alpha in SNR 1987A
Eli Michael, Richard McCray, C. S. J. Pun +12
We describe and model high velocity (~15,000 km/s) Lyman alpha and Balmer alpha emission from supernova remnant 1987A seen in September and October 1997 with the Space Telescope Im…
LSQ13ddu: A rapidly-evolving stripped-envelope supernova with early circumstellar interaction signatures
Peter Clark, Kate Maguire, Cosimo Inserra +30
This paper describes the rapidly evolving and unusual supernova LSQ13ddu, discovered by the La Silla-QUEST survey. LSQ13ddu displayed a rapid rise of just 4.80.9 d to reach a…
ExoClock Project: An open platform for monitoring the ephemerides of Ariel targets with contributions from the public
Anastasia Kokori, Angelos Tsiaras, Billy Edwards +46
The Ariel mission will observe spectroscopically around 1000 exoplanets to further characterise their atmospheres. For the mission to be as efficient as possible, a good knowledge…
Near-infrared K corrections of Type Ia Supernovae and their errors
Luis Boldt, Maximilian Stritzinger, Chris Burns +5
In this paper we use near-infrared (NIR) spectral observations of Type Ia supernovae (SNe Ia) to study the uncertainties inherent to NIR K corrections. To do so, 75 previously publ…
Validation of elemental and isotopic abundances in late-M spectral types with the benchmark HIP 55507 AB system
Jerry W. Xuan, Jason J. Wang, Luke Finnerty +48
M dwarfs are common host stars to exoplanets but often lack atmospheric abundance measurements. Late-M dwarfs are also good analogs to the youngest substellar companions, which sha…
SPIRITS 15c and SPIRITS 14buu: Two Obscured Supernovae in the Nearby Star-Forming Galaxy IC 2163
Jacob E. Jencson, Mansi M. Kasliwal, Joel Johansson +22
SPIRITS---SPitzer InfraRed Intensive Transients Survey---is an ongoing survey of nearby galaxies searching for infrared (IR) transients with Spitzer/IRAC. We present the discovery…
When is Better Best? A multiobjective perspective
Mark Phillips, Clay Holdsworth
Purpose: To identify the most informative methods for reporting results of treatment planning comparisons. Methods: Seven papers from the past year of International Journal of Radi…
Comparison of full-text versus metadata searching in an institutional repository: Case study of the UNT Scholarly Works
Laura Waugh, Hannah Tarver, Mark Phillips +1
Authors in the library science field disagree about the importance of using costly resources to create local metadata records, particularly for scholarly materials that have full-t…
Signatures of rare-earth elements in mineralogical form using laser-ablation dual-comb spectroscopy
Christina Hofer, Errol Bowman, Andrew Jarymowycz +9
Spectroscopy of laser-produced plasmas offers an avenue for real-time, standoff and non-preparatory sensing of rare-earth elements (REEs) within a mineralogical context with applic…