Anthony L. Piro
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View article: Early Emission from Double Detonation Type Ia Supernovae
Early Emission from Double Detonation Type Ia Supernovae Open
A popular model for Type Ia supernovae is the detonation of a CO white dwarf that is triggered by the prior detonation of a thin surface layer of helium, known as a double detonation (DD). We explore the unique early electromagnetic signat…
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: Final Moments. III. Explosion Properties and Progenitor Constraints of CSM-interacting Type II Supernovae
Final Moments. III. Explosion Properties and Progenitor Constraints of CSM-interacting Type II Supernovae Open
We present analysis of the plateau and late-time phase properties of a sample of 39 Type II supernovae (SNe II) that show narrow, transient, high-ionization emission lines (i.e., “IIn-like”) in their early-time spectra from interaction wit…
View article: SN 2019tsf: Evidence for Extended Hydrogen-poor CSM in the Three-peaked Light Curve of Stripped Envelope of a Type Ib Supernova
SN 2019tsf: Evidence for Extended Hydrogen-poor CSM in the Three-peaked Light Curve of Stripped Envelope of a Type Ib Supernova Open
We present multiband ATLAS and ZTF photometry for SN 2019tsf, a Type Ib stripped-envelope supernova (SESN). The slow spectral evolution could be associated with an uncommon explosion mechanism specific to this SN. Possible explanations inc…
View article: Volcanic satellites tidally venting Na, K, and SO2 in optical and infrared light
Volcanic satellites tidally venting Na, K, and SO2 in optical and infrared light Open
Recent infrared spectroscopy from the James Webb Space Telescope (JWST) has spurred analyses of common volcanic gases such as carbon dioxide (CO$_2$), sulphur dioxide (SO$_2$), alongside alkali metals sodium (Na i) and potassium (K i) surr…
View article: Volcanic Satellites Tidally Venting Na, K, SO2 in Optical & Infrared Light
Volcanic Satellites Tidally Venting Na, K, SO2 in Optical & Infrared Light Open
Recent infrared spectroscopy from the James Webb Space Telescope (JWST) has spurred analyses of common volcanic gases such as carbon dioxide (CO2), sulfur dioxide (SO2), alongside alkali metals sodium (Na I) and potassium (K I) surrounding…
View article: Carnegie Supernova Project: Fast-Declining Type Ia Supernovae as Cosmological Distance Indicators
Carnegie Supernova Project: Fast-Declining Type Ia Supernovae as Cosmological Distance Indicators Open
In this paper, the suitability of fast-declining Type Ia supernovae (SNe Ia) as cosmological standard candles is examined utilizing a Hubble Flow sample of 43 of these objects observed by the Carnegie Supernova Project (CSP). We confirm pr…
View article: SN 2022acko and the Properties of its Red Supergiant Progenitor: Direct Detection, Light Curves, and Nebular Spectroscopy
SN 2022acko and the Properties of its Red Supergiant Progenitor: Direct Detection, Light Curves, and Nebular Spectroscopy Open
We present ultraviolet, optical, and infrared observations of the Type II-P supernova SN 2022acko in NGC 1300, located at a distance of 19.0 +/- 2.9 Mpc. Our dataset spans 1-350 days post-explosion in photometry, complemented by late-time …
View article: Optimizing Convolution Direction and Template Selection for Difference Image Analysis
Optimizing Convolution Direction and Template Selection for Difference Image Analysis Open
Difference image analysis (DIA) is a powerful tool for studying time-variable phenomena, and has been used by many time-domain surveys. Most DIA algorithms involve matching the spatially varying point-spread function shape between science …
View article: EP250108a/SN 2025kg: A Jet-driven Stellar Explosion Interacting with Circumstellar Material
EP250108a/SN 2025kg: A Jet-driven Stellar Explosion Interacting with Circumstellar Material Open
We present optical, radio, and X-ray observations of EP250108a/SN 2025kg, a broad-line Type Ic supernova (SN Ic-BL) accompanying an Einstein Probe (EP) fast X-ray transient at z = 0.176. EP250108a/SN 2025kg possesses a double-peaked optica…
View article: The Gravity Collective: A Comprehensive Analysis of the Electromagnetic Search for the Binary Neutron Star Merger GW190425
The Gravity Collective: A Comprehensive Analysis of the Electromagnetic Search for the Binary Neutron Star Merger GW190425 Open
We present an ultraviolet to infrared search for the electromagnetic (EM) counterpart to GW190425, the second ever binary neutron star merger discovered by the LIGO-Virgo-KAGRA Collaboration. GW190425 was more distant and had a larger loca…
View article: Early Emission from Double Detonation Type Ia Supernovae
Early Emission from Double Detonation Type Ia Supernovae Open
A popular model for Type Ia supernovae (SNe Ia) is the detonation of a CO white dwarf (WD) that is triggered by the prior detonation of a thin surface layer of helium, known as a double detonation (DD). We explore the unique early electrom…
View article: Multiphase Shock Cooling Emission in Ultrastripped Supernovae
Multiphase Shock Cooling Emission in Ultrastripped Supernovae Open
Ultrastripped and Type Ibn supernovae (USSNe and SNe Ibn, respectively) are fast-evolving, hydrogen-poor transients that often show signs of interaction with dense circumstellar material (CSM). S. C. Wu & J. Fuller identify a mass range fo…
View article: Late-time Evolution and Instabilities of Tidal Disruption Disks
Late-time Evolution and Instabilities of Tidal Disruption Disks Open
Observations of tidal disruption events on timescales of years after the main flare show evidence of continued activity in the form of optical/UV emission, quasiperiodic eruptions, and delayed radio flares. Motivated by this, we explore th…
View article: JWST and Ground-based Observations of the Type Iax Supernovae SN 2024pxl and SN 2024vjm: Evidence for Weak Deflagration Explosions
JWST and Ground-based Observations of the Type Iax Supernovae SN 2024pxl and SN 2024vjm: Evidence for Weak Deflagration Explosions Open
We present panchromatic optical $+$ near-infrared (NIR) $+$ mid-infrared (MIR) observations of the intermediate-luminosity Type Iax supernova (SN Iax) 2024pxl and the extremely low-luminosity SN Iax 2024vjm. JWST observations provide unpre…
View article: Photometry and Spectroscopy of SN 2024pxl: A Luminosity Link Among Type Iax Supernovae
Photometry and Spectroscopy of SN 2024pxl: A Luminosity Link Among Type Iax Supernovae Open
We present extensive ultraviolet to optical photometric and optical to near-infrared (NIR) spectroscopic follow-up observations of the nearby intermediate-luminosity ($M_V = -$16.81$\pm$0.19~mag) Type Iax supernova (SN) 2024pxl in NGC 6384…
View article: EP250108a/SN 2025kg: A Jet-Driven Stellar Explosion Interacting With Circumstellar Material
EP250108a/SN 2025kg: A Jet-Driven Stellar Explosion Interacting With Circumstellar Material Open
We present optical, radio, and X-ray observations of EP250108a/SN 2025kg, a broad-line Type Ic supernova (SN Ic-BL) accompanying an Einstein Probe (EP) fast X-ray transient (FXT) at $z=0.176$. EP250108a/SN 2025kg possesses a double-peaked …
View article: Multi-Phase Shock Cooling Emission in Ultra-Stripped Supernovae
Multi-Phase Shock Cooling Emission in Ultra-Stripped Supernovae Open
Ultra-stripped and Type Ibn supernovae (USSNe and SNe Ibn, respectively) are fast-evolving, hydrogen-poor transients that often show signs of interaction with dense circumstellar material (CSM). Wu & Fuller (2022) identify a mass range for…
View article: Transients by Black Hole Formation from Red Supergiants: Impact of Dense Circumstellar Matter
Transients by Black Hole Formation from Red Supergiants: Impact of Dense Circumstellar Matter Open
Failed supernovae (SNe), which are likely the main channel for forming stellar-mass black holes, are predicted to accompany mass ejections much weaker than typical core-collapse SNe. We conduct a grid of one-dimensional radiation hydrodyna…
View article: Can Slow Pulsars in Milky Way Globular Clusters Form via Partial Recycling?
Can Slow Pulsars in Milky Way Globular Clusters Form via Partial Recycling? Open
Alongside the population of several hundred radio millisecond pulsars currently known in Milky Way globular clusters, a subset of six slowly spinning pulsars (spin periods 0.3–4 s) are also observed. With inferred magnetic fields ≳10…
View article: Late-time Evolution and Instabilities of Tidal Disruption Disks
Late-time Evolution and Instabilities of Tidal Disruption Disks Open
Observations of tidal disruption events (TDEs) on a timescale of years after the main flare show evidence of continued activity in the form of optical/UV emission, quasi-periodic eruptions, and delayed radio flares. Motivated by this, we e…
View article: Transients by Black Hole Formation from Red Supergiants: Impact of Dense Circumstellar Matter
Transients by Black Hole Formation from Red Supergiants: Impact of Dense Circumstellar Matter Open
Failed supernovae (SNe), which are likely the main channel for forming stellar-mass black holes, are predicted to accompany mass ejections much weaker than typical core-collapse SNe. We conduct a grid of one-dimensional radiation hydrodyna…
View article: Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project
Optical and near-infrared photometry of 94 type II supernovae from the Carnegie Supernova Project Open
Context. Type II supernovae (SNe II) mark the endpoint in the lives of hydrogen-rich massive stars. Their large explosion energies and luminosities allow us to measure distances, metallicities, and star formation rates into the distant Uni…
View article: Merger Precursor: Year-long Transients Preceding Mergers of Low-mass Stripped Stars with Compact Objects
Merger Precursor: Year-long Transients Preceding Mergers of Low-mass Stripped Stars with Compact Objects Open
Binary mass transfer can occur at high rates due to rapid expansion of the donor’s envelope. In the case where mass transfer is unstable, the binary can rapidly shrink its orbit and lead to a merger. In this work we consider the appearance…
View article: Can slow pulsars in Milky Way globular clusters form via partial recycling?
Can slow pulsars in Milky Way globular clusters form via partial recycling? Open
Alongside the population of several hundred radio millisecond pulsars currently known in Milky Way globular clusters, a subset of six slowly spinning pulsars (spin periods $0.3-4\,$s) are also observed. With inferred magnetic fields $\gtrs…
View article: Final Moments. II. Observational Properties and Physical Modeling of Circumstellar-material-interacting Type II Supernovae
Final Moments. II. Observational Properties and Physical Modeling of Circumstellar-material-interacting Type II Supernovae Open
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 of confined ( r < 10 15 cm) circumst…
View article: TOI-1173 A b: The First Inflated Super-Neptune in a Wide Binary System
TOI-1173 A b: The First Inflated Super-Neptune in a Wide Binary System Open
Among Neptunian mass exoplanets (20−50 M ⊕ ), puffy hot Neptunes are extremely rare, and their unique combination of low mass and extended radii implies very low density ( ρ < 0.3 g cm −3 ). Over the last decade, only a few puffy planets h…
View article: 1991T-like Supernovae*
1991T-like Supernovae* Open
Understanding the nature of the luminous 1991T-like supernovae (SNe) is of great importance to SN cosmology as they are likely to have been more common in the early Universe. In this paper, we explore the observational properties of 1991T-…
View article: Carnegie Supernova Project I and II: Measurements of H <sub>0</sub> Using Cepheid, Tip of the Red Giant Branch, and Surface Brightness Fluctuation Distance Calibration to Type Ia Supernovae*
Carnegie Supernova Project I and II: Measurements of H <sub>0</sub> Using Cepheid, Tip of the Red Giant Branch, and Surface Brightness Fluctuation Distance Calibration to Type Ia Supernovae* Open
We present an analysis of Type Ia supernovae (SNe Ia) from the Carnegie Supernova Project I and II and extend the Hubble diagram from optical to near-infrared wavelengths ( uBgVriYJH ). We calculate the Hubble constant, H 0 , using various…