J. Haislip
A5080854907- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Isotope Analysis in Ecology
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Microbial Metabolites in Food Biotechnology
- Magnetic confinement fusion research
- Geology and Paleoclimatology Research
- Galaxies: Formation, Evolution, Phenomena
- Earthquake Detection and Analysis
- Geophysics and Sensor Technology
- Space Satellite Systems and Control
University of North Carolina at Chapel Hill
2016-2025
Appalachian State University
2011-2023
Adıyaman University
2023
Taras Shevchenko National University of Kyiv
2023
Osaka Kyoiku University
2023
University of Delaware
2023
Astronomy and Space
2010
University of North Carolina at Charlotte
2010
During the second observing run of Laser Interferometer gravitational- wave Observatory (LIGO) and Virgo Interferometer, a gravitational-wave signal consistent with binary neutron star coalescence was detected on 2017 August 17th (GW170817), quickly followed by coincident short gamma-ray burst trigger Fermi satellite. The Distance Less Than 40 (DLT40) Mpc supernova search performed pointed follow-up observations sample galaxies regularly monitored survey which fell within combined LIGO+Virgo...
Abstract We present the optical spectroscopic evolution of SN 2023ixf seen in subnight cadence spectra from 1.18 to 15 days after explosion. identify high-ionization emission features, signatures interaction with material surrounding progenitor star, that fade over first 7 days, rapid between observed within same night. compare lines and their relative strength those other supernovae early interaction, finding a close match 2020pni 2017ahn spectrum 2014G at later epochs. To physically...
Abstract We present the densely sampled early light curve of Type II supernova (SN) 2023ixf, first observed within hours explosion in nearby Pinwheel Galaxy (Messier 101; 6.7 Mpc). Comparing these data to recently updated models shock-cooling emission, we find that progenitor likely had a radius 410 ± 10 R ⊙ . Our estimate is model dependent but consistent with red supergiant. These provide good fit starting about 1 day after explosion, despite fact classification spectrum shows signatures...
ABSTRACT OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in binary black hole model. The model predicted major outburst 2015 December. We found the did occur within expected time range, peaking on December 5 at magnitude 12.9 R -band. Based Swift /XRT satellite measurements and polarization data, we find it included thermal component. Its timing provides an accurate estimate for spin of primary hole, . present also...
We present ultraviolet, optical and near-infrared observations of the interacting transient SN 2009ip, covering period from start outburst in 2012 October until end observing season. The reached a peak magnitude MV = −17.7 mag, with total integrated luminosity 1.9 × 1049 erg over August–December. light curve fades rapidly, dropping by 4.5 mag V-band 100 d. spectra are dominated narrow emission lines broad electron scattering wings, signalling dense circumstellar environment, together...
Abstract Proxima b is a terrestrial-mass planet in the habitable zone of Centauri. Centauri’s high stellar activity, however, casts doubt on habitability b: sufficiently bright and frequent flares any associated proton events may destroy planet’s ozone layer, allowing lethal levels UV flux to reach its surface. In 2016 March, Evryscope observed first naked-eye-brightness superflare detected from increased optical by factor ∼68 during released bolometric energy 10 33.5 erg, ∼10× larger than...
Ultraviolet, optical, and near-infrared photometry optical spectroscopy of the broad-lined Type Ic supernova (SN) 2009bb are presented, following flux evolution from −10 to +285 days past B-band maximum. Thanks very early discovery, it is possible place tight constraints on SN explosion epoch. The expansion velocities measured near maximum spectra found be only slightly smaller than those prototype 1998bw associated with GRB 980425. Fitting an analytical model pseudobolometric light curve...
We present an extensive set of photometric and spectroscopic data for SN 2009jf, a nearby Type Ib supernova (SN), spanning from ∼20 d before B-band maximum to 1 yr after maximum. show that 2009jf is slowly evolving energetic stripped-envelope likely massive progenitor (25–30 M⊙). The large progenitor's mass allows us explain the complete hydrogen plus helium stripping without invoking presence binary companion. occurred close young cluster, in crowded environment with ongoing star formation....
We present results derived from the first multi-chord stellar occultations by transneptunian object (50000) Quaoar, observed on 2011 May 4 and 2012 February 17, a single-chord occultation October 15. If timing of five chords obtained in were correct, then Quaoar would possess topographic features (crater or mountain) that be too large for body this mass. An alternative model consists applying time shifts to some account possible errors. Satisfactory elliptical fits are possible, yielding an...
We present an extensive optical and near-infrared photometric spectroscopic campaign of the Type IIP supernova SN 2012aw. The data set densely covers evolution 2012aw shortly after explosion through end photospheric phase, with two additional observations collected during nebular to fit radioactive tail estimate 56Ni mass. Also included in our analysis is previously published Swift UV data, therefore providing a complete view ultraviolet-optical-infrared phase. On basis set, we all relevant...
We present HST spectroscopy for 45 cataclysmic variables (CVs), observed with HST/COS and HST/STIS. For 36 CVs, the white dwarf is recognisable through its broad Ly α absorption profile we measure effective temperatures (Teff) by fitting data assuming log g = 8.35, which corresponds to average mass CV dwarfs (≃0.8 M⊙). Our results nearly double number of an accurate temperature measurement. find that CVs above period gap have, on average, higher (〈Teff〉 ≃ 23 000 K) exhibit much more scatter...
We present the first reported case of simultaneous metallicity determination a gamma-ray burst (GRB) host galaxy, from both afterglow absorption lines as well strong emission-line diagnostics. Using spectroscopic and imaging observations long-duration Swift GRB 121024A at z = 2.30, we give one most complete views host/environment to date. observe damped Lyα absorber (DLA) with hydrogen column density log |$N({\rm H\,{\small I}})\,=\,21.88\pm 0.10$|, H2 in Lyman–Werner bands (molecular...
Abstract We search for superflares from 4068 cool stars in 2+ yr of Evryscope photometry, focusing on those with high-cadence data both and the Transiting Exoplanet Survey Satellite ( TESS ). The array small telescopes observed 575 flares 284 stars, a median energy 10 34.0 erg. Since 2016, has enabled detection rare events all by through multi-year, continuous observing. report around twice previous largest number 34 erg nearby stars. find eight amplitudes 3+ g ′ magnitudes, reaching 5.6 mag...
Abstract We present the results of our power spectral density analysis for BL Lac object OJ 287, utilizing Fermi -LAT survey at high-energy γ -rays, Swift -XRT in X-rays, several ground-based telescopes and Kepler satellite optical, radio GHz frequencies. The light curves are modeled terms continuous-time autoregressive moving average (CARMA) processes. Owing to inclusion data, we were able construct first time optical variability spectrum a blazar without any gaps across ∼6 dex temporal Our...
Superflares may provide the dominant source of biologically relevant UV radiation to rocky habitable zone M-dwarf planets (M-Earths), altering planetary atmospheres and conditions for surface life. The combined line continuum flare emission has usually been approximated by a 9000 K blackbody. If superflares are hotter, then be 10X higher than predicted from optical. However, it is unknown how long reach temperatures above K. Only handful have recorded with multi-wavelength high-cadence...
Abstract We perform a comprehensive search for optical precursor emission at the position of SN 2023ixf using data from DLT40, ZTF, and ATLAS surveys. By comparing current set with outburst hydrodynamical model light curves, we find that probability significant within 5 yr explosion is low, circumstellar material (CSM) ejected during any possible likely smaller than ∼0.015 M ⊙ . to toy models, that, if there was outburst, duration must have been shorter ∼100 days typical brightness r ≃ −9...
Abstract We present photometric and spectroscopic data of SN 2018lab, a low-luminosity Type IIP supernova (LLSN) with V -band peak luminosity −15.1 ± 0.1 mag. 2018lab was discovered by the Distance Less Than 40 Mpc (DLT40) survey only 0.73 days post-explosion, as determined observations from Transiting Exoplanet Survey Satellite (TESS). TESS yield densely sampled, fast-rising, early-time light curve likely powered ejecta–circumstellar medium (CSM) interaction. The blueshifted, broadened...
A comprehensive set of optical and near-infrared (NIR) photometry spectroscopy is presented for the faint fast 2008ha-like supernova (SN) 2010ae. Contingent on adopted value host extinction, SN 2010ae reached a peak brightness -13.8 > M_V -15.3 mag, while modeling UVOIR light curve suggests it produced 0.003--0.007 M_sun (56)Ni, ejected 0.30--0.60 material, had an explosion energy 0.04--0.30x10^51 erg. The values these parameters are similar to peculiar 2008ha --for which we also present...
We present ultraviolet, optical, near-infrared photometry and spectroscopy of SN 2009N in NGC 4487. This object is a type II-P supernova with spectra resembling those subluminous supernovae, while its bolometric luminosity similar to that the intermediate 2008in. created SYNOW models plateau phase for line identification measure expansion velocity. In we find signs indicating possible weak interaction between ejecta pre-existing circumstellar material. These are also previously unpublished...