A. S. B. Schultz
A5106730368- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Spectroscopy and Laser Applications
- Superconducting Materials and Applications
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Molecular Spectroscopy and Structure
- Particle physics theoretical and experimental studies
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Atomic and Molecular Physics
University of Hawaii System
2016-2023
University of Hawaiʻi at Mānoa
2016-2018
Research Centre for Astronomy and Earth Sciences
2018
UNSW Sydney
2001-2013
Ames Research Center
1995-2007
Search for Extraterrestrial Intelligence
2006-2007
Washington University in St. Louis
1990-1993
The Foundation Supernova Survey aims to provide a large, high-fidelity, homogeneous, and precisely-calibrated low-redshift Type Ia supernova (SN Ia) sample for cosmology. calibration of the current SN is largest component systematic uncertainties cosmology, new data are necessary make progress. We present motivation, survey design, observation strategy, implementation, first results Survey. using Pan-STARRS telescope obtain photometry up 800 SNe at z < 0.1. This strategy has several unique...
We present extensive optical photometry of the afterglow GRB~221009A. Our data cover $0.9 - 59.9$\,days from time \textit{Swift} and \textit{Fermi} GRB detections. Photometry in $rizy$-band filters was collected primarily with Pan-STARRS supplemented by multiple 1- to 4-meter imaging facilities. analyzed Swift X-ray found a single decline rate power-law $f(t) \propto t^{-1.556\pm0.002}$ best describes light curve. In addition high foreground Milky Way dust extinction along this line sight,...
On 2018 Feb. 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in K2 Campaign 16 field. With a redshift of z=0.01098 and peak apparent magnitude B_{max}=14.31, is nearest brightest SNe Ia yet observed by Kepler spacecraft. Here we present discovery ASASSN-18bt, light curve, pre-discovery data from ASAS-SN Asteroid Terrestrial-impact Last Alert System (ATLAS). The early-time curve has an unprecedented 30-minute cadence photometric precision SN~Ia it...
Abstract Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically confirmed Type Ia supernova (SN Ia) observed in Kepler field. The data revealed an excess emission its early light curve, allowing us to place interesting constraints on progenitor system. Here we present extensive optical, ultraviolet, and near-infrared photometry, as well dense sampling of optical spectra, for this object. SN relatively normal photometric evolution, with a rise time 18.3 ± 0.3 days Δ m 15 ( B ) =...
We present the initial results of a 3-mm spectral line survey towards 83 methanol maser selected massive star-forming regions. Here we report observations J=5-4 and 6-5 rotational transitions methyl cyanide (CH3CN) J=1-0 transition HCO+and H13CO+. CH3CN emission is detected in 58 sources (70 %) our sample). estimate temperature column density for 37 these using diagram method. The temperatures derive range from 28-166 K, are lower than previously reported temperatures, derived higher J...
We searched for an optical counterpart to the first gravitational wave source discovered by LIGO (GW150914), using a combination of Pan-STARRS1 wide-field telescope and PESSTO spectroscopic follow-up programme. As final sky maps changed during analysis, total probability being spatially coincident with our fields was finally only 4.2 per cent. Therefore we discuss results primarily as demonstration survey capability Pan-STARRS PESSTO. mapped out 442 square degrees northern region initial...
Recent analyses suggest that distance residuals measured from Type Ia supernovae (SNe Ia) are correlated with local host galaxy properties within a few kpc of the SN explosion. However, well-established correlation global is nearly as significant, shift 0.06 mag across low to high mass boundary (the step). Here, 273 SNe at $z<0.1$, we investigate whether stellar masses and rest-frame $u-g$ colors regions 1.5 explosion site significantly better measurements than or random locations in hosts....
We present the discovery of PS18kh, a tidal disruption event (TDE) discovered at center SDSS J075654.53+341543.6 ($d\simeq322$ Mpc) by Pan-STARRS Survey for Transients. Our dataset includes pre-discovery survey data from Pan-STARRS, All-Sky Automated Supernovae (ASAS-SN), and Asteroid Terrestrial-impact Last Alert System (ATLAS) as well high-cadence, multi-wavelength follow-up ground-based telescopes Swift, spanning 56 days before peak light until 75 after. The optical/UV emission PS18kh is...
We present a search for an electromagnetic counterpart of the gravitational wave source GW151226. Using Pan-STARRS1 telescope we mapped out 290 square degrees in optical i_ps filter starting 11.5hr after LIGO information release and lasting further 28 days. The first observations started 49.5hr time GW151226 detection. typically reached sensitivity limits = 20.3-20.8 covered 26.5% probability skymap. supplemented this with ATLAS survey data, reaching 31% region to shallower depths m~19....
Abstract We report the discovery and multiwavelength data analysis of peculiar optical transient, ATLAS17aeu. This transient was identified in sky map LIGO gravitational wave event GW 170104 by our ATLAS Pan-STARRS coverage. ATLAS17aeu discovered 23.1 hr after rapidly faded over next three nights, with a spectrum revealing blue featureless continuum. The also detected as fading X-ray source Swift radio at 6 15 GHz. gamma-ray burst GRB 170105A satellites 19.04 4.10 before first detection....
We present an exquisite, 30-min cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering moment explosion and subsequent rise, continuing past peak brightness. These data are supplemented by multi-color Pan-STARRS1 CTIO 4-m DECam observations obtained within hours explosion. The K2 has unusual two-component shape, where flux rises with a steep linear gradient for first few days, followed quadratic rise as seen typical...
Abstract Measurements of the dark energy equation-of-state parameter, w , have been limited by uncertainty in selection effects and photometric calibration z < 0.1 Type Ia supernovae (SNe Ia). The Foundation Supernova Survey is designed to lower these uncertainties creating a new sample SNe observed on Pan-STARRS system. Here we combine with from Medium Deep measure cosmological parameters 1338 single telescope single, well-calibrated For first time, both low- high- data are predominantly...
In order to identify the sources of observed diffuse high-energy neutrino flux, it is crucial discover their electromagnetic counterparts. To increase sensitivity detecting counterparts transient or variable by telescopes with a limited field view, IceCube began releasing alerts for single ( E ν > 60 TeV) detections sky localisation regions 1° radius in 2016. We used Pan-STARRS1 follow-up five these during 2016–2017 search any optical transients that may be related neutrinos. Typically...
Abstract We present the discovery and optical follow-up of faintest supernova-like transient known. The event (SN 2019gsc) was discovered in a star-forming host at 53 Mpc by ATLAS. A detailed multicolor light curve gathered with Pan-STARRS1 spectroscopy obtained Nordic Optical Telescope Gemini-North. spectra near maximum show narrow features low velocities 3000–4000 km s −1 , similar to extremely low-luminosity SNe 2010ae 2008ha, displays fast decline (Δ m 15 ( r ) = 0.91 ± 0.10 mag). 2008ha...
We present extensive optical photometry of the afterglow GRB~221009A. Our data cover $0.9 - 59.9$\,days from time \textit{Swift} and \textit{Fermi} GRB detections. Photometry in $rizy$-band filters was collected primarily with Pan-STARRS supplemented by multiple 1- to 4-meter imaging facilities. analyzed Swift X-ray found a single decline rate power-law $f(t) \propto t^{-1.556\pm0.002}$ best describes light curve. In addition high foreground Milky Way dust extinction along this line sight,...
We present 2micron polarization measurements of positions in the BN region Orion Molecular Cloud (OMC-1) made with NICMOS Camera 2 (0.2'' resolution) on HST. Our results are as follows: is sim 29% polarized by dichroic absorption and appears to be illuminating source for most nebulosity its north up 5'' south. Although stars probably all absorption, there a number compact, but non-point-source, objects that could combination both local scattering star light. identify several candidate YSOs,...
We have observed the polarized light at 2 μm in center of NGC 1068 with NICMOS Camera on Hubble Space Telescope. The nucleus is dominated by a bright, unresolved source, level 6.0% ± 1.2% position angle 122° 15°. There are two lobes extending up to 8'' northeast and southwest nucleus. flux both quite clumpy, maximum polarization occurring lobe 17% when smoothed 023 resolution. perpendiculars vectors these point back intense nuclear source within one 0076 pixel, thereby confirming that this...
HST NICMOS narrowband images of the shocked molecular hydrogen emission in OMC-1 are analyzed to reveal new information on BN/KL outflow. The outstanding morphological feature this region is array "fingers" emanating from general vicinity IRc2 and presence several Herbig-Haro objects. appear resolve individual shock fronts. This work a more quantitative detailed analysis our data previous paper. Line strengths for H2 1-0 S(4) plus 2-1 S(6) lines at 1.89 μm estimated measurements with...
Abstract A class of asteroids, called large super-fast rotators (large SFRs), have rotation periods shorter than 2 hr and diameters larger ∼0.3 km. They pose challenges to the usual interior rubble-pile structure unless a relatively high bulk density is assumed. So far, only six SFRs been found. Therefore, we present survey asteroid using Panoramic Survey Telescope Rapid Response System (Pan-STARRS) 1 telescope during 2016 October 26–31 search for more study their properties. total 876...
Images of Herbig-Haro Object No. 2 obtained with the Planetary Camera Hubble Space Telescope are presented and discussed. The images, in emission lines H-alpha, forbidden S II, O III at a scale 0.044 arcsec/pixel, have been registered to within 11 milliarcsec, spherically aberrated images restored Richardson-Lucy algorithm. A H complexes HH 2, which appear as somewhat extended (2-3 arcsec), amorphous features on ground-based found resolve into rich array structures sizes range...
The results of an H2 emission-line survey the 1-0 S(1) transition from 33 Herbig-Haro objects and suspected are presented. focuses on that have been recently identified and/or lie at southern declinations. Data also presented for 2-1 S(3), Q(1), Q(3) transitions a subset sample. emission has detected toward 16 or nebulous objects; published optical spectra 13 these suggest they low-excitation nebulae associated with low-velocity shocks. stars RU Lup LkH-alpha 234. Extended mapped in vicinity...
view Abstract Citations (26) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Double Infrared Source toward the Soft Gamma-Ray Repeater SGR 1900+14 Vrba, F. J. ; Luginbuhl, C. B. Hurley, K. Li, P. Kulkarni, S. R. van Kerkwijk, M. H. Hartmann, D. Campusano, L. E. Graham, Clowes, G. Kouveliotou, Probst, Gatley, I. Merrill, Joyce, Mendez, Smith, Schultz, A. We report results of an extensive set optical and near-infrared photometry spectroscopy...
We present a model for empirically reproducing line profiles of molecular hydrogen emission in bow shocks. The takes into account velocity, dissociation limit, cooling function, viewing angle, shape and limited form extinction. Our results show that both geometrical factors shock physics can significantly affect the profile morphology. In companion paper we will apply this to Fabry–Perot observations shocks Orion BN–KL outflow.