A5071030895- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Non-Destructive Testing Techniques
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Electrical Fault Detection and Protection
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Methane Hydrates and Related Phenomena
- Astrophysics and Star Formation Studies
- Ocean Waves and Remote Sensing
- Radiation Effects and Dosimetry
- Advanced Optical Sensing Technologies
- Laser-Plasma Interactions and Diagnostics
- Radiation Detection and Scintillator Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Oceanographic and Atmospheric Processes
- Ocular and Laser Science Research
- Reservoir Engineering and Simulation Methods
- Geophysics and Gravity Measurements
Purdue University West Lafayette
2021-2025
Abstract We present initial results from a James Webb Space Telescope (JWST) survey of the youngest Galactic core-collapse supernova remnant, Cassiopeia A (Cas A), made up NIRCam and MIRI imaging mosaics that map emission main shell, interior, surrounding circumstellar/interstellar material (CSM/ISM). also four exploratory positions Medium Resolution Spectrograph integral field unit spectroscopy sample ejecta, CSM, associated dust representative shocked unshocked regions. Surprising...
Abstract We present a search for luminous, long-duration ambiguous nuclear transients (ANTs) similar to the unprecedented discovery of extreme, event AT2021lwx with >150 d rise time and luminosity 1045.7 erg s−1. use Lasair transient broker Zwicky Transient Facility (ZTF) data lasting more than one year exhibiting smooth declines. Our returns 59 events, seven which we classify as ANTs assumed be driven by accretion onto supermassive black holes. propose remaining 52 are stochastic...
Abstract We analyze a sample of 45 Type II supernovae from the Zwicky Transient Facility public survey using grid hydrodynamical models in order to assess whether theoretically driven forecasts can intelligently guide follow-up observations supporting all-sky alert streams. estimate several progenitor properties and explosion physics parameters, including zero-age main-sequence (ZAMS) mass, mass-loss rate, kinetic energy, 56 Ni mass synthesized, host extinction, time explosion. Using...
A new model grid containing 228,016 synthetic red supergiant explosions (Type II supernovae) is introduced. Time evolution of spectral energy distributions from 1 to 50,000 (100 frequency bins in a log scale) computed at each time step up 500 days after explosion model. We provide light curves for the filters Vera C. Rubin Observatory's Legacy Survey Space and (LSST), Zwicky Transient Facility (ZTF), Sloan Digital Sky Servey (SDSS), Neil Gehrels Swift Observatory, but any photometric can be...
We present initial results from a JWST survey of the youngest Galactic core-collapse supernova remnant Cassiopeia A (Cas A), made up NIRCam and MIRI imaging mosaics that map emission main shell, interior, surrounding circumstellar/interstellar material (CSM/ISM). also four exploratory positions MIRI/MRS IFU spectroscopy sample ejecta, CSM, associated dust representative shocked unshocked regions. Surprising discoveries include: 1) web-like network ejecta filaments resolved to 0.01 pc scales...
Abstract We present UV–optical–near-infrared observations and modeling of supernova (SN) 2024ggi, a type II (SN II) located in NGC 3621 at 7.2 Mpc. Early-time (“flash”) spectroscopy SN 2024ggi within +0.8 days discovery shows emission lines H i , He C iii N with narrow core broad, symmetric wings (i.e., “IIn-like”) arising from the photoionized, optically thick, unshocked circumstellar material (CSM) that surrounded progenitor star shock breakout (SBO). By next spectral epoch +1.5 days,...
Abstract We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), luminous V -band peak M = −18.42 ± 0.08 mag), and rapid early decline rate s 1 3.47 0.09 mag (50 days) −1 ). By comparing observed photometry to hydrodynamic MESA+STELLA model grid, we constrain progenitor be massive red supergiant ZAMS 19–25 ⊙ . Independent comparisons nebular spectral models also suggest an initial He-core mass of ∼6 , thus progenitor. For IIP,...
Galactic supernova remnants (SNRs) with angular dimensions greater than a few degrees are relatively rare, as located more ten off the plane. Here we report UV and optical investigation of two previously suspected SNRs in both diameter latitude. One is proposed remnant discovered 2008 through 1420 MHz polarization maps near coordinates $l$ = 353, $b$ $-$34. GALEX far (FUV) H$\alpha$ emission mosaics show object's radio coincident 11 x 14 degree shell filaments surrounding diffuse ring....
Abstract We report multiwavelength observations and characterization of the ultraluminous transient AT 2021lwx (ZTF20abrbeie; aka “Barbie”) identified in alert stream Zwicky Transient Facility (ZTF) using a Recommender Engine For Intelligent Tracking filter on ANTARES broker. From spectroscopically measured redshift 0.995, we estimate peak-observed pseudo-bolometric luminosity log( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow>...
Calcium-rich (Ca-rich) transients are a new class of supernovae (SNe) that known for their comparatively rapid evolution, modest peak luminosities, and strong nebular calcium emission lines. Currently, the progenitor systems Ca-rich remain unknown. Although they exhibit spectroscopic properties not unlike core-collapse Type Ib/c SNe, nearly half found in outskirts host galaxies predominantly elliptical, suggesting closer connection to older stellar populations SNe Ia. In this paper, we...
We present proper motion measurements of oxygen-rich ejecta the LMC supernova remnant N132D using two epochs Hubble Space Telescope Advanced Camera for Surveys data spanning 16 years. The motions 120 individual knots gas were measured and used to calculate a center expansion (CoE) $\alpha$=05:25:01.71 $\delta$=-69:38:41.64 (J2000) with 1-$\sigma$ uncertainty 2.90 arcseconds. This new CoE measurement is 9.2 10.8 arcseconds from previous estimates based on geometry optically emitting ejecta....
We present UV/optical/NIR observations and modeling of supernova (SN) 2024ggi, a type II (SN II) located in NGC 3621 at 7.2 Mpc. Early-time ("flash") spectroscopy SN 2024ggi within +0.8 days discovery shows emission lines H I, He C III, N III with narrow core broad, symmetric wings (i.e., IIn-like) arising from the photoionized, optically-thick, unshocked circumstellar material (CSM) that surrounded progenitor star shock breakout. By next spectral epoch +1.5 days, showed rise ionization as...
We present a search for luminous, long-duration ambiguous nuclear transients (ANTs) similar to the unprecedented discovery of extreme, event AT2021lwx with $>150$ d rise time and luminosity $10^{45.7}$ erg s$^{-1}$. use Lasair transient broker Zwicky Transient Facility (ZTF) data lasting more than one year exhibiting smooth declines. Our returns 59 events, seven which we classify as ANTs assumed be driven by accretion onto supermassive black holes. propose remaining 52 are stochastic...
We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ($t_\mathrm{PT}$ $\sim$47 days), luminous V-band peak ($M_{V}$ = $-$18.42 $\pm$ 0.08 mag), and rapid early decline rate ($s1$ 3.47 0.09 mag (50 days)$^{-1}$). By comparing observed photometry to hydrodynamic MESA+STELLA model grid, we constrain progenitor be massive red supergiant M$_\mathrm{ZAMS}$ $\simeq$19 - 25 M$_{\odot}$. Independent comparisons nebular spectral models also suggest an...
We present high resolution WIYN/NEID echelle spectroscopy (R $\approx70$,000) of the supernova (SN) 2023ixf in M101, obtained 1.51 to 18.51 days after explosion over nine epochs. Daily monitoring for first four shows narrow emission features ($\leq200$ km s$^{-1}$), exhibiting predominantly blueshifted velocities, that rapidly weaken, broaden, and vanish a manner consistent with radiative acceleration SN shock eventually overrunning or enveloping full extent dense circumstellar medium (CSM)....
We report multi-wavelength observations and characterization of the ultraluminous transient AT 2021lwx (ZTF20abrbeie; aka ``Barbie'') identified in alert stream Zwicky Transient Facility (ZTF) using a Recommender Engine For Intelligent Tracking (REFITT) filter on ANTARES broker. From spectroscopically measured redshift 0.995, we estimate peak observed pseudo-bolometric luminosity log (L$_{\text{max}} / [\text{erg}/\text{s}]$) = 45.7 from slowly fading ztf-$\it{g}$ ztf-$r$ light curves...
Here we present a catalog of 12,993 photometrically-classified supernova-like light curves from the Zwicky Transient Facility, along with candidate host galaxy associations. By training random forest classifier on spectroscopically classified supernovae Bright Survey, achieve an accuracy 80% across four supernova classes resulting in final data set 8208 Type Ia, 2080 II, 1985 Ib/c, and 720 SLSN. Our work represents pathfinder effort to supply massive sets value-added information that can be...
We present proper motion measurements of oxygen-rich ejecta the LMC supernova remnant N132D using two epochs Hubble Space Telescope Advanced Camera for Surveys data spanning 16 years. The motions 120 individual knots gas were measured and used to calculate a center expansion (CoE) $α$=05:25:01.71 $δ$=-69:38:41.64 (J2000) with 1-$σ$ uncertainty 2.90 arcseconds. This new CoE measurement is 9.2 10.8 arcseconds from previous estimates based on geometry optically emitting ejecta. also derive an...
A new model grid containing 228,016 synthetic red supergiant explosions (Type II supernovae) is introduced. Time evolution of spectral energy distributions from 1 to 50,000 (100 frequency bins in a log scale) computed at each time step up 500 days after explosion model. We provide light curves for the filters Vera C. Rubin Observatory's Legacy Survey Space and (LSST), Zwicky Transient Facility (ZTF), Sloan Digital Sky Servey (SDSS), Neil Gehrels Swift Observatory, but any photometric can be...
We analyze a sample of 45 Type II supernovae from the Zwicky Transient Facility (ZTF) public survey using grid hydrodynamical models in order to assess whether theoretically-driven forecasts can intelligently guide follow up observations supporting all-sky alert streams. estimate several progenitor properties and explosion physics parameters including zero-age-main-sequence (ZAMS) mass, mass-loss rate, kinetic energy, 56Ni mass synthesized, host extinction, time explosion. Using complete...