A5052149666- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Reservoir Engineering and Simulation Methods
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Oceanographic and Atmospheric Processes
- Ocean Waves and Remote Sensing
Purdue University West Lafayette
2023-2024
University of Arizona
2023
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...
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,...
Recent observations with the James Webb Space Telescope (JWST) have revealed unprecedented details of an intricate filamentary structure unshocked ejecta within young supernova remnant (SNR) Cassiopeia A ( offering new insights into mechanisms governing (SN) explosions and subsequent evolution ejecta. We aim to investigate origin newly discovered web-like network filaments in Our specific objectives are: (i) characterize three-dimensional (3D) kinematics (ii) identify physical responsible...
Abstract We present high-resolution WIYN/NEID echelle spectroscopy ( R ≈ 70,000) of the supernova (SN) 2023ixf in M101, obtained 1.51 to 18.51 days after explosion over nine epochs. Daily monitoring for first 4 shows narrow emission features (≤200 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). The most...
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>...
ABSTRACT We present a series of ground-based photometry and spectroscopy the superluminous Type IIn supernova (SN) ASASSN-15ua, which shows evidence for strong interaction with pre-existing dense circumstellar material (CSM). Our observations constrain speed, mass-loss rate, extent progenitor wind shortly before explosion. A narrow P Cygni absorption component reveals speed ∼100 km s−1. As observed in previous SNe IIn, intermediate-width H α emission became more asymmetric blueshifted over...
JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images - hence dubbed Green Monster that stretches across central parts projection. Combining kinematic information from NIRSpec MRS with multi-wavelength imaging NIRCam MIRI, we associate circumstellar material was lost during asymmetric mass-loss phase. are dominated by dust but its spectra show lines Ne, H Fe...
Abstract JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images—hence dubbed Green Monster—that stretches across central parts projection. Combining kinematic information from NIRSpec Medium Resolution Spectrograph with multiwavelength imaging NIRCam MIRI, we associate Monster circumstellar material (CSM) that was lost during asymmetric mass-loss phase. images...
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...