D. O. Jones
A5002523157- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Calibration and Measurement Techniques
- Neutrino Physics Research
- Spectroscopy and Chemometric Analyses
- Radio Astronomy Observations and Technology
- Nuclear Physics and Applications
- History and Developments in Astronomy
- Space Science and Extraterrestrial Life
- Chemical Synthesis and Characterization
- Advanced Sensor Technologies Research
- Machine Learning and Algorithms
- Infrared Target Detection Methodologies
- Ionosphere and magnetosphere dynamics
University of Hawaii at Hilo
2023-2025
Gemini North Observatory
2023-2024
NSF’s NOIRLab
2023-2024
University of Hawaii System
2024
University of California, Santa Cruz
2017-2023
Johns Hopkins University
2012-2018
Max Planck Society
2015
Max Planck Institute for Radio Astronomy
2015
Max Planck Institute for Nuclear Physics
2011
Dublin Institute For Advanced Studies
2011
We present optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey. detail improvements to PS1 SN photometry, astrometry calibration that reduce systematic uncertainties in distances. combine subset of 279 ($0.03 < z 0.68$) with useful distance estimates from SDSS, SNLS, various low-z HST samples form largest combined sample consisting a total 1048 ranging $0.01 2.3$, which we...
We use the Wide Field Camera 3 (WFC3) on Hubble Space Telescope (HST) to reduce uncertainty in local value of constant (H_0) from 3.3% 2.4%. Improvements come new, near-infrared observations Cepheid variables 11 new hosts recent SNe~Ia, more than doubling sample SNe~Ia having a Cepheid-calibrated distance for total 19; these leverage magnitude-z relation based 300 at z<0.15. All 19 and megamaser system NGC4258 were observed with WFC3, thus nullifying cross-instrument zeropoint errors. Other...
We report observations from HST of Cepheids in the hosts 42 SNe Ia used to calibrate Hubble constant (H0). These include all suitable last 40 years at z<0.01, measured with >1000 orbits, more than doubling sample whose size limits precision H0. The are calibrated geometrically Gaia EDR3 parallaxes, masers N4258 (here tripling that Cepheid sample), and DEBs LMC. were same WFC3 instrument filters (F555W, F814W, F160W) negate zeropoint errors. present multiple verifications photometry tests...
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift $z=0.001$ to 2.26. This work features an increased sample size, span, and improved treatment systematic uncertainties comparison original Pantheon results a factor two improvement constraining power. For Flat$\Lambda$CDM model, we find $\Omega_M=0.334\pm0.018$ SNe alone. Flat$w_0$CDM measure $w_0=-0.90\pm0.14$ alone, H$_0=73.5\pm1.1$...
Here we present 1701 light curves of 1550 spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part the Pantheon+ SN analysis and SH0ES (Supernovae H0 for Equation State dark energy) distance-ladder analysis. This effort is one a series works perform an extensive review redshifts, peculiar velocities, photometric calibration, intrinsic-scatter models SNe Ia. The total number curves, which are compiled across 18 different surveys,...
We present new parallax measurements of 7 long-period (> 10 days) Milky Way Cepheids (SS CMa, XY Car, VY VX Per, WZ Sgr, X Pup and S Vul) using astrometry from spatial scanning WFC3 on HST. Observations were obtained at 6 month intervals over 4 years. The distances are 1.7--3.6 kpc with a mean precision 45 microarcseconds best 29 (SNR = 14). accuracy the parallaxes is demonstrated through independent analyses >100 reference stars. This raises to number significant measurements, 8 this...
We present a spectroscopic catalog of 70,841 visually inspected M dwarfs from the seventh data release Sloan Digital Sky Survey. For each spectrum, we provide measurements spectral type, number molecular band heads, and Hα, Hβ, Hγ, Hδ, Ca ii K emission lines. In addition, calculate metallicity-sensitive parameter ζ identify relationship between g − r z colors dwarfs. assess precision our types (which were assigned by individual examination), review bulk attributes sample, examine magnetic...
We present an analysis of 15 Type Ia supernovae (SNe Ia) at redshift z > 1 (9 1.5 < 2.3) recently discovered in the CANDELS and CLASH Multi-Cycle Treasury programs using WFC3 on Hubble Space Telescope. combine these SNe with a new compilation 1050 Ia, jointly calibrated corrected for simulated survey biases to produce accurate distance measurements. unbiased constraints expansion rate six redshifts range 0.07 based only this combined SN sample. The added leverage our sample leads factor ~3...
We report observations from HST of Cepheids in the hosts 42 SNe Ia used to calibrate Hubble constant (H0). These include all suitable last 40 years at z<0.01, measured with >1000 orbits, more than doubling sample whose size limits precision H0. The are calibrated geometrically Gaia EDR3 parallaxes, masers N4258 (here tripling that Cepheid sample), and DEBs LMC. were same WFC3 instrument filters (F555W, F814W, F160W) negate zeropoint errors. present multiple verifications photometry...
We present panchromatic observations and modeling of supernova (SN) 2020tlf, the first normal type II-P/L SN with confirmed precursor emission, as detected by Young Supernova Experiment transient survey Pan-STARRS1 telescope. Pre-explosion emission was in $riz-$bands at 130 days prior to 2020tlf persisted relatively constant flux until light. Soon after discovery, "flash" spectroscopy revealed prominent narrow symmetric lines ($v_w < 300$ km s$^{-1}$) that resulted from photo-ionization...
Abstract We present UV and/or optical observations and models of SN 2023ixf, a type II supernova (SN) located in Messier 101 at 6.9 Mpc. Early time ( flash ) spectroscopy obtained primarily Lick Observatory, reveals emission lines H i , He i/ii C iv N iii/iv/v with narrow core broad, symmetric wings arising from the photoionization dense, close-in circumstellar material (CSM) around progenitor star prior to shock breakout. These electron-scattering broadened line profiles persist for ∼8 days...
Abstract We present preexplosion optical and infrared (IR) imaging at the site of type II supernova (SN II) 2023ixf in Messier 101 6.9 Mpc. astrometrically registered a ground-based image SN to archival Hubble Space Telescope (HST), Spitzer (Spitzer), near-IR images. A single point source is detected position consistent with wavelengths ranging from HST R band 4.5 μ m. Fitting blackbody red supergiant (RSG) spectral energy distributions (SEDs), we find that anomalously cool significant...
Abstract Recent studies suggest spectroscopic differences explain a fraction of the variation in Type Ia supernova (SN Ia) luminosities after light-curve/color standardization. In this work, (i) we empirically characterize variations standardized SN luminosities, and (ii) use spectroscopically inferred parameter, SIP, to improve precision SNe along distance ladder determination Hubble constant ( H 0 ). First, show that Pantheon+ covariance model modestly overestimates uncertainty magnitudes...
Abstract We present ultraviolet/optical/near-infrared observations and modeling of Type II supernovae (SNe II) whose early time ( δ t < 2 days) spectra show transient, narrow emission lines from shock ionization confined r 10 15 cm) circumstellar material (CSM). The observed electron-scattering broadened line profiles (i.e., IIn-like) H i , He i/ii C iv N iii/iv/v the CSM persist on a characteristic timescale IIn ) that marks transition to lower-density emergence Doppler-broadened...
Abstract The Dark Energy Spectroscopic Instrument (DESI) collaboration measured a tight relation between the Hubble constant ( H 0 ) and distance to Coma cluster using fundamental plane (FP) of deepest, most homogeneous sample early-type galaxies. To determine , we measure by several independent routes, each with its own geometric reference. We precise from 13 Type Ia supernovae (SNe Ia) in mean standardized brightness <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
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 the supernova (SN) sample and Type-Ia SN (SN Ia) rates from Cluster Lensing And Supernova survey with Hubble (CLASH). Using Advanced Camera for Surveys Wide Field 3 on Space Telescope (HST), we have imaged 25 galaxy-cluster fields parallel of non-cluster galaxies. report a 27 SNe discovered in fields. Of these SNe, ∼13 are classified as Ia candidates, including four candidates at redshifts z > 1.2. measure volumetric to redshift 1.8 add first upper limit rate range < 2.4. The...
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) was a multi-cycle treasury program on the Hubble Space Telescope (HST) that surveyed total area of ~0.25 deg^2 with ~900 HST orbits spread across 5 fields over 3 years. Within these survey images we discovered 65 supernovae (SN) all types, out to z~2.5. We classify ~24 as Type Ia SN (SN Ia) based host-galaxy redshifts and photometry (supplemented by grism spectroscopy 6 SN). Here present measurement volumetric rate...
A spectral-energy distribution (SED) model for Type Ia supernovae (SNe Ia) is a critical tool measuring precise and accurate distances across large redshift range constraining cosmological parameters. We present an improved framework, SALT3, which has several advantages over current models including the leading SALT2 (SALT2.4). While SALT3 similar philosophy, it differs from by having estimation of uncertainties, better separation color light-curve stretch, publicly available training code....
Time domain science has undergone a revolution over the past decade, with tens of thousands new supernovae (SNe) discovered each year. However, several observational domains, including SNe within days or hours explosion and faint, red transients, are just beginning to be explored. Here, we present Young Supernova Experiment (YSE), novel optical time-domain survey on Pan-STARRS telescopes. Our is designed obtain well-sampled $griz$ light curves for transient events up $z \approx 0.2$. This...
Abstract Separating the components of redshift due to expansion and peculiar motion in nearby universe ( z < 0.1) is critical for using Type Ia Supernovae (SNe Ia) measure Hubble constant H 0 ) equation-of-state parameter dark energy w ). Here, we study two dominant “motions” contributing velocities: large-scale, coherent-flow (CF) motions small-scale gravitationally associated galaxies deemed be a galaxy group. We use set 584 low- SNe from Pantheon+ sample, evaluate efficacy corrections...
We present Hubble Space Telescope imaging of a pre-explosion counterpart to SN 2019yvr obtained 2.6 years before its explosion as type Ib supernova (SN Ib). Aligning post-explosion Gemini-S/GSAOI image, we demonstrate that there is single source consistent with being the progenitor system, second candidate after iPTF13bvn. also analyzed Spitzer/IRAC imaging, but do not detect any counterparts at location. was highly reddened, and comparing spectra photometry those other, less extinguished...
We present multiwavelength observations of the Type II SN 2020pni. Classified at $\sim 1.3$ days after explosion, object showed narrow (FWHM $<250\,\textrm{km}\,\textrm{s}^{-1}$) recombination lines ionized helium, nitrogen, and carbon, as typically seen in flash-spectroscopy events. Using non-LTE radiative transfer code CMFGEN to model our first high resolution spectrum, we infer a progenitor mass-loss rate $\dot{M}=(3.5-5.3)\times10^{-3}$ M$_{\odot}$ yr$^{-1}$ (assuming wind velocity...
Type Ia supernovae (SNe Ia) are more precise standardizable candles when measured in the near-infrared (NIR) than optical. With this motivation, from 2012-2017 we embarked on RAISIN program with Hubble Space Telescope (HST) to obtain rest-frame NIR light curves for a cosmologically distant sample of 37 SN ($0.2 \lesssim z 0.6$) discovered by Pan-STARRS and Dark Energy Survey. By comparing higher-$z$ HST data 42 at $z<0.1$ observed Carnegie Supernova Project, construct diagram observations...
We present the Young Supernova Experiment Data Release 1 (YSE DR1), comprised of processed multi-color Pan-STARRS1 (PS1) griz and Zwicky Transient Facility (ZTF) gr photometry 1975 transients with host-galaxy associations, redshifts, spectroscopic/photometric classifications, additional data products from 2019 November 24 to 2021 December 20. YSE DR1 spans discoveries observations young fast-rising supernovae (SNe) that persist for over a year, redshift distribution reaching z~0.5. relative...