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View article: Pan-STARRS Follow-up of the Gravitational-wave Event S250818k and the Light Curve of SN2025ulz
Pan-STARRS Follow-up of the Gravitational-wave Event S250818k and the Light Curve of SN2025ulz Open
Kilonovae are the scientifically rich—but observationally elusive—optical transient phenomena associated with compact binary mergers. Only a handful of events have been discovered to date, all through multiwavelength (gamma-ray) and multim…
View article: JWST Observations of SN 2023ixf. II. The Panchromatic Evolution between 250 and 720 Days after the Explosion
JWST Observations of SN 2023ixf. II. The Panchromatic Evolution between 250 and 720 Days after the Explosion Open
We present the nebular phase spectroscopic and photometric observations of the nearby hydrogen-rich core-collapse supernova (CCSN) SN 2023ixf, obtained through our JWST programs. These observations, combined with ground-based optical and n…
View article: Pan-STARRS follow-up of the gravitational-wave event S250818k and the lightcurve of SN 2025ulz
Pan-STARRS follow-up of the gravitational-wave event S250818k and the lightcurve of SN 2025ulz Open
Kilonovae are the scientifically rich, but observationally elusive, optical transient phenomena associated with compact binary mergers. Only a handful of events have been discovered to date, all through multi-wavelength (gamma ray) and mul…
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: JWST Discovery of a High-redshift Tidal Disruption Event Candidate in COSMOS-Web
JWST Discovery of a High-redshift Tidal Disruption Event Candidate in COSMOS-Web Open
The rates and properties of tidal disruption events (TDEs) provide valuable insights into their host galaxy central stellar densities and the demographics of their central supermassive black holes. TDEs have been observed only at low redsh…
View article: TESSELLATE: Piecing Together the Variable Sky with TESS
TESSELLATE: Piecing Together the Variable Sky with TESS Open
We present TESSELLATE , a dedicated pipeline for performing an untargeted search documenting all variable phenomena captured by the TESS space telescope. Building on the TESSreduce difference imaging pipeline, TESSELLATE extracts calibrate…
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: The First Photometric Evidence of a Transient/Variable Source at <i>z</i> > 5 with JWST
The First Photometric Evidence of a Transient/Variable Source at <i>z</i> > 5 with JWST Open
The James Webb Space Telescope (JWST) discovered 79 transients out to z ∼ 4.8 through the JADES Transient Survey (JTS), but the JTS did not find any z > 5 transients. We present the first photometric evidence of a z > 5 transient/variable …
View article: Early light curve excess in Type IIb supernovae observed with ATLAS
Early light curve excess in Type IIb supernovae observed with ATLAS Open
Context. Type IIb supernovae (SNe IIb) often exhibit an early light curve excess (EE) preceding the main peak powered by 56 Ni decay. The physical origin of this early emission remains an open question. Among the proposed scenarios, shock …
View article: JWST’s First View of Tidal Disruption Events: Compact, Accretion-driven Emission Lines and Strong Silicate Emission in an Infrared-selected Sample
JWST’s First View of Tidal Disruption Events: Compact, Accretion-driven Emission Lines and Strong Silicate Emission in an Infrared-selected Sample Open
Mid-infrared (MIR) emission from tidal disruption events (TDEs) is a powerful probe of the circumnuclear environment around dormant supermassive black holes. This emission arises from the reprocessing of intrinsic emission into thermal MIR…
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: Characterizing the standardization properties of type ia supernovae in the <i>z</i> band with hierarchical Bayesian modelling
Characterizing the standardization properties of type ia supernovae in the <i>z</i> band with hierarchical Bayesian modelling Open
Type Ia supernovae (SNe Ia) are standardizable candles: their peak magnitudes can be corrected for correlations between light-curve properties and their luminosities to precisely estimate distances. Understanding SN Ia standardization acro…
View article: The Internal Kinematics of NGC 2808 and Its Multiple Populations
The Internal Kinematics of NGC 2808 and Its Multiple Populations Open
We use new Hubble Space Telescope observations coupled with archival data spanning a total temporal baseline of 17 yr to study the internal kinematics of the multiple populations in the globular cluster NGC 2808 from its center out to ∼8 h…
View article: Characterising the Standardisation Properties of Type Ia Supernovae in the z band with Hierarchical Bayesian Modelling
Characterising the Standardisation Properties of Type Ia Supernovae in the z band with Hierarchical Bayesian Modelling Open
Type Ia supernovae (SNe Ia) are standardisable candles: their peak magnitudes can be corrected for correlations between light curve properties and their luminosities to precisely estimate distances. Understanding SN Ia standardisation acro…
View article: COSMOS-Web: Comprehensive Data Reduction for Wide-Area JWST NIRCam Imaging
COSMOS-Web: Comprehensive Data Reduction for Wide-Area JWST NIRCam Imaging Open
We present the data reduction methodology used for the COSMOS-Web survey JWST NIRCam data. Covering 0.54 deg^2 with four broadband filters (F115W, F150W, F277W, F444W) and a total exposure time of approximately 270 hours, COSMOS-Web repres…
View article: JWST/MIRI Observations of Newly Formed Dust in the Cold, Dense Shell of the Type IIn SN 2005ip
JWST/MIRI Observations of Newly Formed Dust in the Cold, Dense Shell of the Type IIn SN 2005ip Open
Dust from core-collapse supernovae (CCSNe), specifically Type IIP supernovae (SNe IIP), has been suggested to be a significant source of the dust observed in high-redshift galaxies. CCSNe eject large amounts of newly formed heavy elements,…
View article: Large Cold Dust Reservoir Revealed in Transitional SN Ib 2014C by James Webb Space Telescope Mid-infrared Spectroscopy
Large Cold Dust Reservoir Revealed in Transitional SN Ib 2014C by James Webb Space Telescope Mid-infrared Spectroscopy Open
Supernova (SN) 2014C is a rare transitional event that exploded as a hydrogen-poor, helium-rich Type Ib SN and subsequently interacted with a hydrogen-rich circumstellar medium (CSM) a few months postexplosion. This unique interacting obje…
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: Very Late-Time JWST and Keck Spectra of the Oxygen-Rich Supernova 1995N
Very Late-Time JWST and Keck Spectra of the Oxygen-Rich Supernova 1995N Open
We present new {\it JWST}/MIRI MRS and Keck spectra of SN 1995N obtained in 2022--2023, more than 10,000 days after the supernova (SN) explosion. These spectra are among the latest direct detections of a core-collapse SN, both through emis…
View article: The First Photometric Evidence of a Transient/Variable Source at z>5 with JWST
The First Photometric Evidence of a Transient/Variable Source at z>5 with JWST Open
The James Webb Space Telescope (JWST) discovered 79 transients out to $z$$\sim$4.8 through the JADES Transient Survey (JTS), but the JTS did not find any $z$$>$5 transients. Here, we present the first photometric evidence of a $z$$>$5 tran…
View article: DAmodel: hierarchical Bayesian modelling of DA white dwarfs for spectrophotometric calibration
DAmodel: hierarchical Bayesian modelling of DA white dwarfs for spectrophotometric calibration Open
We use hierarchical Bayesian modelling to calibrate a network of 32 all-sky faint DA white dwarf (DA WD) spectrophotometric standards ($16.5 < V < 19.5$) alongside three CALSPEC standards, from 912 Å to 32 $\mu$m. The framework is th…
View article: JWST/MIRI detects the dusty SN1993J about 30 years after explosion
JWST/MIRI detects the dusty SN1993J about 30 years after explosion Open
Context. Core-collapse supernovae (CCSNe) have long been considered to contribute significantly to the cosmic dust budget. Newly-formed dust in the SN ejecta cools quickly and is therefore detectable at mid-infrared (mid-IR) wavelengths. H…
View article: JWST's First View of Tidal Disruption Events: Compact, Accretion-Driven Emission Lines & Strong Silicate Emission in an Infrared-selected Sample
JWST's First View of Tidal Disruption Events: Compact, Accretion-Driven Emission Lines & Strong Silicate Emission in an Infrared-selected Sample Open
Mid-infrared (MIR) emission from tidal disruption events (TDEs) is a powerful probe of the circumnuclear environment around dormant supermassive black holes. This emission arises from the reprocessing of intrinsic emission into thermal MIR…
View article: Testing for Intrinsic Type Ia Supernova Luminosity Evolution at z > 2 with JWST
Testing for Intrinsic Type Ia Supernova Luminosity Evolution at z > 2 with JWST Open
The James Webb Space Telescope (JWST) is opening new frontiers of transient discovery and follow-up at high redshift. Here we present the discovery of a spectroscopically confirmed Type Ia supernova (SN Ia; SN 2023aeax) at z = 2.15 with JW…
View article: An optically led search for kilonovae to <i>z</i>∼0.3 with the Kilonova and Transients Programme (KNTraP)
An optically led search for kilonovae to <i>z</i>∼0.3 with the Kilonova and Transients Programme (KNTraP) Open
Compact binary mergers detectable in gravitational waves can be accompanied by a kilonova, an electromagnetic transient powered by radioactive decay of newly synthesised r-process elements. A few kilonova candidates have been observed duri…
View article: LensWatch. II. Improved Photometry and Time-delay Constraints on the Strongly Lensed Type Ia Supernova 2022qmx (“SN Zwicky”) with Hubble Space Telescope Template Observations
LensWatch. II. Improved Photometry and Time-delay Constraints on the Strongly Lensed Type Ia Supernova 2022qmx (“SN Zwicky”) with Hubble Space Telescope Template Observations Open
Strongly lensed supernovae (SNe) are a rare class of transient that can offer tight cosmological constraints that are complementary to methods from other astronomical events. We present a follow-up study of one recently discovered strongly…
View article: The JADES Transient Survey: Discovery and Classification of Supernovae in the JADES Deep Field
The JADES Transient Survey: Discovery and Classification of Supernovae in the JADES Deep Field Open
The JWST Advanced Deep Extragalactic Survey (JADES) is a multicycle JWST program that has taken among the deepest near- and mid-infrared images to date (down to ∼30 AB mag) over ∼25 arcmin 2 in the GOODS-S field in two sets of observations…
View article: ATClean: A Novel Method for Detecting Low-luminosity Transients and Application to Pre-explosion Counterparts from SN 2023ixf
ATClean: A Novel Method for Detecting Low-luminosity Transients and Application to Pre-explosion Counterparts from SN 2023ixf Open
In an effort to search for faint sources of emission over arbitrary timescales, we present a novel method for analyzing forced photometry light curves in difference imaging from optical surveys. Our method “ATLAS Clean,” or ATClean, utiliz…
View article: Properties of high-redshift Type II supernovae discovered by the JADES transient survey
Properties of high-redshift Type II supernovae discovered by the JADES transient survey Open
In this work we estimate the explosion and progenitor properties of six Type II supernovae (SNe) at 0.675 <= z <= 3.61 discovered by the James Webb Space Telescope (JWST) Advanced Deep Extragalactic Survey (JADES) transient survey by model…
View article: Dynamic Imprints of Colliding-wind Dust Formation from WR 140
Dynamic Imprints of Colliding-wind Dust Formation from WR 140 Open
Carbon-rich Wolf–Rayet (WR) binaries are a prominent source of carbonaceous dust that contribute to the dust budget of galaxies. The “textbook” example of an episodic dust-producing WR binary, WR 140 (HD 193793), provides us with an ideal …