J. C. Wheeler
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View article: JWST Spectroscopy of SN Ia 2022aaiq and 2024gy: Evidence for Enhanced Central Stable Ni Abundance and a Deflagration-to-Detonation Transition
JWST Spectroscopy of SN Ia 2022aaiq and 2024gy: Evidence for Enhanced Central Stable Ni Abundance and a Deflagration-to-Detonation Transition Open
We present optical + near-infrared (NIR) + mid-infrared (MIR) observations of the normal Type Ia supernovae (SN Ia) 2022aaiq and 2024gy in the nebular phase, continuously spanning 0.35-28 microns. Medium-resolution JWST spectroscopy reveal…
View article: North+Lone Star Supernova Host Survey. I. Local Host-galaxy H<i>α</i> Surface Brightness and the Hubble Residuals of Type Ia Supernovae
North+Lone Star Supernova Host Survey. I. Local Host-galaxy H<i>α</i> Surface Brightness and the Hubble Residuals of Type Ia Supernovae Open
We present optical integral field unit spectroscopy acquired with the George and Cynthia Mitchell Spectrograph on the Harlan J. Smith telescope at McDonald Observatory of 94 galaxies (0.01 < z < 0.058) that have hosted Type Ia supernovae (…
View article: Biomechanical platelet activation: diseases that require a new class of antiplatelet therapeutics
Biomechanical platelet activation: diseases that require a new class of antiplatelet therapeutics Open
Mechanisms of platelet activation have traditionally been investigated through the activation of biochemical pathways through cell surface agonists such as adenosine diphosphate, thrombin, and collagen. However, recent research has identif…
View article: North+Lone Star Supernova Host Survey I: Local Host-Galaxy H$α$ Surface Brightness and the Hubble Residuals of Type Ia Supernovae
North+Lone Star Supernova Host Survey I: Local Host-Galaxy H$α$ Surface Brightness and the Hubble Residuals of Type Ia Supernovae Open
We present optical integral-field unit (IFU) spectroscopy acquired with the George and Cynthia Mitchell Spectrograph on the Harlan J. Smith telescope at McDonald Observatory of 94 galaxies (0.01 < z < 0.058) that have hosted Type Ia supern…
View article: Luminous Type II Short-plateau SN 2023ufx: Asymmetric Explosion of a Partially Stripped Massive Progenitor
Luminous Type II Short-plateau SN 2023ufx: Asymmetric Explosion of a Partially Stripped Massive Progenitor Open
We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), a luminous V -band peak ( M V = −18.42 ± 0.08 mag), and a rapid early decline rate ( s 1 = 3.47 ± 0.09 mag (50 days) …
View article: A Novel, Universal Targeting Receptor-Adaptor CAR Platform Demonstrates Versatile, Flexible, and Controlled Tumor Inhibition in an Ipsc-Derived T-Cell
A Novel, Universal Targeting Receptor-Adaptor CAR Platform Demonstrates Versatile, Flexible, and Controlled Tumor Inhibition in an Ipsc-Derived T-Cell Open
Despite positive outcomes in some hematological oncology patients, several barriers to current autologous CAR T-cell therapies exist that prevent broader clinical success. These include tumor antigen escape, on-target off-tumor toxicities,…
View article: SN 2022oqm: A Bright and Multipeaked Calcium-rich Transient
SN 2022oqm: A Bright and Multipeaked Calcium-rich Transient Open
We present the photometric and spectroscopic evolution of SN 2022oqm, a nearby multipeaked hydrogen- and helium-weak calcium-rich transient (CaRT). SN 2022oqm was detected 13.1 kpc from its host galaxy, the face-on spiral galaxy NGC 5875. …
View article: Ejecta Masses in Type Ia Supernovae—Implications for the Progenitor and the Explosion Scenario*
Ejecta Masses in Type Ia Supernovae—Implications for the Progenitor and the Explosion Scenario* Open
The progenitor system(s) as well as the explosion mechanism(s) of thermonuclear (Type Ia) supernovae are long-standing issues in astrophysics. Here we present ejecta masses and other physical parameters for 28 recent Type Ia supernovae inf…
View article: Extended Shock Breakout and Early Circumstellar Interaction in SN 2024ggi
Extended Shock Breakout and Early Circumstellar Interaction in SN 2024ggi Open
We present high-cadence photometric and spectroscopic observations of supernova (SN) 2024ggi, a Type II SN with flash spectroscopy features, which exploded in the nearby galaxy NGC 3621 at ∼7 Mpc. The light-curve evolution over the first 3…
View article: Deep <i>JWST</i>/NIRCam imaging of Supernova 1987A
Deep <i>JWST</i>/NIRCam imaging of Supernova 1987A Open
JWST/NIRCam obtained high angular resolution (0.05–0.1 arcsec), deep near-infrared 1–5 $\mu$m imaging of Supernova (SN) 1987A taken 35 yr after the explosion. In the NIRCam images, we identify: (1) faint H2 crescents, which are emissions l…
View article: Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST
Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST Open
We present JWST NIRCam (F356W and F444W filters) and MIRI (F770W) images and NIRSpec Integral Field Unit (IFU) spectroscopy of the young Galactic supernova remnant Cassiopeia A (Cas A) to probe the physical conditions for molecular CO form…
View article: Optical Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Projects I and II
Optical Spectroscopy of Type Ia Supernovae by the Carnegie Supernova Projects I and II Open
We present the second and final release of optical spectroscopy of Type Ia supernovae (SNe Ia) obtained during the first and second phases of the Carnegie Supernova Project (CSP-I and CSP-II). The newly released data consist of 148 spectra…
View article: Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova
Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova Open
We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar “03fg-like” (or “super-Chandrasekhar”) Type Ia supernova (SN Ia), in the nebular phase at 338 days postexplosion. Our combined spectrum continuously cov…
View article: A JWST Survey of the Supernova Remnant Cassiopeia A
A JWST Survey of the Supernova Remnant Cassiopeia A Open
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 of NIRCam and MIRI imaging mosaics that map emission from the main shell, in…
View article: Cosmological Distance Measurement of Twelve Nearby Supernovae IIP with ROTSE-IIIb
Cosmological Distance Measurement of Twelve Nearby Supernovae IIP with ROTSE-IIIb Open
We present cosmological analysis of 12 nearby ( z < 0.06) Type IIP supernovae (SNe IIP) observed with the ROTSE-IIIb telescope. To achieve precise photometry, we present a new image-differencing technique that is implemented for the first …
View article: Data products and software for `X-ray diagnostics of Cassiopeia A's "Green Monster": evidence for dense shocked circumstellar plasma`
Data products and software for `X-ray diagnostics of Cassiopeia A's "Green Monster": evidence for dense shocked circumstellar plasma` Open
Data Reproduction Package for the publication ‘X-ray diagnostics of Cassiopeia A’s “Green Monster”: evidence for dense shocked circumstellar plasma’ Authors: Jacco Vink, Manan Agarwal, Patrick Slane, Ilse De Looze, Dan Milisavljevic, Danie…
View article: ASASSN-15LH: A SUPERLUMINOUS ULTRAVIOLET REBRIGHTENING OBSERVED by SWIFT and HUBBLE
ASASSN-15LH: A SUPERLUMINOUS ULTRAVIOLET REBRIGHTENING OBSERVED by SWIFT and HUBBLE Open
We present and discuss ultraviolet and optical photometry from the Ultraviolet/Optical Telescope, X-ray limits from the X-Ray Telescope on Swift, and imaging polarimetry and ultraviolet/optical spectroscopy with the Hubble Space Telescope,…
View article: Ground-based and JWST Observations of SN 2022pul. I. Unusual Signatures of Carbon, Oxygen, and Circumstellar Interaction in a Peculiar Type Ia Supernova
Ground-based and JWST Observations of SN 2022pul. I. Unusual Signatures of Carbon, Oxygen, and Circumstellar Interaction in a Peculiar Type Ia Supernova Open
Nebular-phase observations of peculiar Type Ia supernovae (SNe Ia) provide important constraints on progenitor scenarios and explosion dynamics for both these rare SNe and the more common, cosmologically useful SNe Ia. We present observati…
View article: JWST NIRCam Observations of SN 1987A: Spitzer Comparison and Spectral Decomposition
JWST NIRCam Observations of SN 1987A: Spitzer Comparison and Spectral Decomposition Open
JWST Near Infrared Camera (NIRCam) observations at 1.5–4.5 μ m have provided broadband and narrowband imaging of the evolving remnant of SN 1987A with unparalleled sensitivity and spatial resolution. Comparing with previous marginally spat…
View article: The Preexplosion Environments and the Progenitor of SN 2023ixf from the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX)
The Preexplosion Environments and the Progenitor of SN 2023ixf from the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Open
Supernova (SN) 2023ixf was discovered on 2023 May 19. The host galaxy, M101, was observed by the Hobby–Eberly Telescope Dark Energy Experiment collaboration over the period 2020 April 30–2020 July 10, using the Visible Integral-field Repli…
View article: The Pre-explosion Environments and The Progenitor of SN 2023ixf from the Hobby Eberly Telescope Dark Energy Experiment (HETDEX)
The Pre-explosion Environments and The Progenitor of SN 2023ixf from the Hobby Eberly Telescope Dark Energy Experiment (HETDEX) Open
Supernova (SN) 2023ixf was discovered on May 19th, 2023. The host galaxy, M101, was observed by the Hobby Eberly Telescope Dark Energy Experiment (HETDEX) collaboration over the period April 30, 2020 -- July 10, 2020, using the Visible Int…
View article: Spectropolarimetry of the Type IIP supernova 2021yja: an unusually high continuum polarization during the photospheric phase
Spectropolarimetry of the Type IIP supernova 2021yja: an unusually high continuum polarization during the photospheric phase Open
We present six epochs of optical spectropolarimetry of the Type IIP supernova (SN) 2021yja ranging from ∼25 to 95 d after the explosion. An unusually high continuum linear polarization of $p \approx 0.9~{{\ \rm per\ cent}}$ is measured dur…
View article: Newly Formed Dust within the Circumstellar Environment of SNIa-CSM 2018evt
Newly Formed Dust within the Circumstellar Environment of SNIa-CSM 2018evt Open
Dust associated with various stellar sources in galaxies at all cosmic epochs remains a controversial topic, particularly whether supernovae (SNe) play an important role in dust production. We report evidence of dust formation in the cold,…
View article: Early Spectroscopy and Dense Circumstellar Medium Interaction in SN 2023ixf
Early Spectroscopy and Dense Circumstellar Medium Interaction in SN 2023ixf Open
We present the optical spectroscopic evolution of SN 2023ixf seen in subnight cadence spectra from 1.18 to 15 days after explosion. We identify high-ionization emission features, signatures of interaction with material surrounding the prog…
View article: JWST NIRCam Observations of SN 1987A: Spitzer Comparison and Spectral Decomposition
JWST NIRCam Observations of SN 1987A: Spitzer Comparison and Spectral Decomposition Open
JWST NIRCam observations at 1.5-4.5 $μ$m have provided broad and narrow band imaging of the evolving remnant of SN 1987A with unparalleled sensitivity and spatial resolution. Comparing with previous marginally spatially resolved Spitzer IR…
View article: From Discovery to the First Month of the Type II Supernova 2023ixf: High and Variable Mass Loss in the Final Year before Explosion
From Discovery to the First Month of the Type II Supernova 2023ixf: High and Variable Mass Loss in the Final Year before Explosion Open
We present the discovery of the Type II supernova SN 2023ixf in M101 and follow-up photometric and spectroscopic observations, respectively, in the first month and week of its evolution. Our discovery was made within a day of estimated fir…
View article: The LIGO HET Response (LIGHETR) Project to Discover and Spectroscopically Follow Optical Transients Associated with Neutron Star Mergers*
The LIGO HET Response (LIGHETR) Project to Discover and Spectroscopically Follow Optical Transients Associated with Neutron Star Mergers* Open
The LIGO HET Response (LIGHETR) project is an enterprise to follow up optical transients (OTs) discovered as gravitational-wave merger sources by the LIGO/Virgo collaboration (LVC). Early spectroscopy has the potential to constrain crucial…