H. Flewelling
A5061352278- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Spacecraft and Cryogenic Technologies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Isotope Analysis in Ecology
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Planetary Science and Exploration
- SAS software applications and methods
- Galaxies: Formation, Evolution, Phenomena
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Space Exploration and Technology
- Spectroscopy Techniques in Biomedical and Chemical Research
Canada–France–Hawaii Telescope
2020-2023
University of Hawaii System
2013-2022
University of Hawaiʻi at Mānoa
2011-2021
Monterey Institute for Research in Astronomy
2012-2017
Max Planck Institute for Astronomy
2015
Queen's University Belfast
2015
University of Michigan–Ann Arbor
2009
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
We present a three-dimensional map of interstellar dust reddening, covering three-quarters the sky out to distance several kiloparsecs, based on Pan-STARRS 1 (PS1) and 2MASS photometry. The reveals wealth detailed structure, from filaments large cloud complexes. has hybrid angular resolution, with most at an resolution –, maximum . distribution is determined in fully probabilistic framework, yielding uncertainty reddening along each line sight, as well stellar distances, reddenings,...
We present a new 3D map of interstellar dust reddening, covering three quarters the sky (declinations δ ≳ −30°) out to distance several kiloparsecs. The is based on high-quality stellar photometry 800 million stars from Pan-STARRS 1 and 2MASS. divide into sightlines containing few hundred each, then infer distances types, along with line-of-sight distribution. Our incorporates more accurate average extinction law an additional 1.5 yr data, tracing greater extinctions at higher angular...
We report extensive observational data for five of the lowest redshift Super-Luminous Type Ic Supernovae (SL-SNe Ic) discovered to date, namely PTF10hgi, SN2011ke, PTF11rks, SN2011kf and SN2012il. Photometric imaging transients at +50 +230 days after peak combined with host galaxy subtraction reveals a luminous tail phase four these SL-SNe. A high resolution, optical near infrared spectrum from xshooter provides detection broad He I $\lambda$10830 emission line in (+50d) SN2012il, revealing...
As of 2012 January 21, the Pan-STARRS 1 3π Survey has observed 3/4 sky visible from Hawaii with a minimum 2 and mean 7.6 observations in five filters, gP1, rP1, iP1, zP1, yP1. Now at end second year mission, we are position to make an initial public release portion this unprecedented data set. This article describes PS1 Photometric Ladder, Release 12.01. is first series releases be generated as survey coverage increases analysis improves. The Ladder rungs every hour right ascension four...
This paper describes the organization of database and catalog data products from Pan-STARRS1 $3\pi$ Steradian Survey. The are available in form an SQL-based relational MAST, Mikulski Archive for Space Telescopes at STScI. is described detail, including construction database, provenance data, schema, how tables related. Examples queries a range science goals included.
We present the details of photometric and astrometric calibration Pan-STARRS1 $3\pi$ Survey. The goals were to reduce systematic effects introduced by camera detectors, place all observations onto a system with consistent zero points over entire area surveyed, ~30,000 square degrees north $\delta$ = -30 degrees. compensates for similar so that positions, proper motions, parallaxes are reliable as well. Pan-STARRS Data Release 2 (DR2) astrometry is tied Gaia DR1 release.
We present a systematic search for changing-look quasars based on repeat photometry from Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with spectra SDSS SDSS-III Baryon Oscillation Spectroscopic Survey. Objects large, |Δg| > 1 mag photometric variations in their light curves are selected as candidates to look changes broad emission line (BEL) features. Out of sample 1011 objects that satisfy our selection criteria have more than one epoch spectroscopy, we find 10 examples variable...
We present optical spectroscopy and optical/near-IR photometry of 31 host galaxies hydrogen-poor superluminous supernovae (SLSNe), including 15 events from the Pan-STARRS1 Medium Deep Survey. Our sample spans redshift range 0.1 ≲ z 1.6, is first comprehensive galaxy study this specific subclass cosmic explosions. Combining multi-band emission-line measurements, we determine luminosities, stellar masses, star formation rates, metallicities. find that, as a whole, hosts SLSNe are...
The Asteroid Terrestrial impact Last Alert System (ATLAS) system consists of two 0.5m Schmidt telescopes with cameras covering 29 square degrees at plate scale 1.86 arcsec per pixel. Working in tandem, the routinely survey whole sky visible from Hawaii (above $\delta > -50^{\circ}$) every nights, exposing four times night, typically reaching $o < 19$ magnitude exposure when moon is illuminated and $c 19.5$ dark skies. Construction underway further units to be sited Chile South Africa which...
We present griz light curves of 146 spectroscopically confirmed Type Ia Supernovae ($0.03 < z <0.65$) discovered during the first 1.5 years Pan-STARRS1 Medium Deep Survey. The natural photometric system is determined by a combination on-site measurements instrument response function and observations spectrophotometric standard stars. find that systematic uncertainties in are currently 1.2\% without accounting for uncertainty HST Calspec definition AB system. A Hubble diagram constructed with...
ABSTRACT The dust extinction curve is a critical component of many observational programs and an important diagnostic the physics interstellar medium. Here we present new measurements its variation toward tens thousands stars, hundred-fold larger sample than in existing detailed studies. We use data from APOGEE spectroscopic survey combination with ten-band photometry Pan-STARRS1, Two Micron All-Sky Survey, Wide-field Infrared Survey Explorer . find that optical through infrared well...
We present the ATLAS discovery and initial analysis of first 18 days unusual transient event, ATLAS18qqn/AT2018cow. It is characterized by a high peak luminosity ($\sim$1.7 $\times$ 10$^{44}$ erg s$^{-1}$), rapidly evolving light curves ($>$5 mag rise to in $\sim$3.5 days), hot blackbody spectra, peaking at $\sim$27000 K that are relatively featureless unchanging over two weeks. The bolometric curve cannot be powered radioactive decay under realistic assumptions. detection high-energy...
ABSTRACT Luminous quasars at <?CDATA $z\gt 5.6$?> can be studied in detail with the current generation of telescopes and provide us unique information on first gigayear universe. Thus far, these studies have been statistically limited by number known redshifts. Such are rare, therefore, wide-field surveys required to identify them, multiwavelength data separate them efficiently from their main contaminants, far more numerous cool dwarfs. In this paper, we update extend selection for $z\sim...
Recent searches by unbiased, wide-field surveys have uncovered a group of extremely luminous optical transients. The initial discoveries SN 2005ap the Texas Supernova Search and SCP-06F6 in deep Hubble pencil beam survey were followed Palomar Transient Factory confirmation host redshifts for other similar transients share common properties high luminosities (peak magnitudes ∼−21 to −23), blue colors, lack H or He spectral features. physical mechanism that produces luminosity is uncertain,...
We present the Pan-STARRS1 discovery of long-lived and blue transient PS1-11af, which was also detected by Galaxy Evolution Explorer with coordinated observations in near-ultraviolet (NUV) band. PS1-11af is associated nucleus an early type galaxy at redshift z = 0.4046 that exhibits no evidence for star formation or active galactic activity. Four epochs spectroscopy reveal a pair broad absorption features UV on otherwise featureless spectra. Despite superficial similarity these to P-Cygni...
We present the discovery of two ultra-luminous supernovae (SNe) at z ~ 0.9 with Pan-STARRS1 Medium-Deep Survey. These SNe, PS1-10ky and PS1-10awh, are amongst most luminous SNe ever discovered, comparable to unusual transients SN 2005ap SCP 06F6. Like 06F6, they show characteristic high luminosities (M_bol -22.5 mag), blue spectra a few broad absorption lines, no evidence for H or He. have constructed full multi-color light curve sensitive peak spectral energy distribution in rest-frame...
Luminous distant quasars are unique probes of the high-redshift intergalactic medium (IGM) and growth massive galaxies black holes in early universe. Absorption due to neutral hydrogen IGM makes beyond a redshift very faint optical z band, thus locating at higher redshifts requires large surveys that sensitive above 1 micron. We report discovery three new quasars, corresponding an age universe Myr, selected as z-band dropouts Pan-STARRS1 survey. This increases number known from four seven....
We present the discovery of a faint Milky Way satellite, Laevens 2/Triangulum II, found in Panoramic Survey Telescope And Rapid Response System 3π imaging data and confirmed with follow-up wide-field photometry from Large Binocular Cameras. The stellar system, an absolute magnitude MV = −1.8 ± 0.5, heliocentric distance , half-mass–radius shows remarkable similarity to faint, nearby, small satellites such as Willman 1, Segue 2, Boötes II. II further populates region parameter space for which...
We present observations of SN 2015bn (= PS15ae = CSS141223-113342+004332 MLS150211-113342+004333), a Type I superluminous supernova (SLSN) at redshift $z=0.1136$. As well as being one the closest SLSNe yet discovered, it is intrinsically brighter ($M_U\approx-23.1$) and in fainter galaxy ($M_B\approx-16.0$) than other $z\sim0.1$. used this opportunity to collect most extensive dataset for any SLSN date, including densely-sampled spectroscopy photometry, from UV NIR, spanning $-$50 +250 days...
RR Lyrae stars may be the best practical tracers of Galactic halo (sub-)structure and kinematics. The PanSTARRS1 (PS1) $3\pi$ survey offers multi-band, multi-epoch, precise photometry across much sky, but a robust identification in this data set poses challenge, given PS1's sparse, asynchronous multi-band light curves ($\lesssim 12$ epochs each five bands, taken over 4.5-year period). We present novel template fitting technique that uses well-defined physically motivated stars, demonstrate...