Daniel Brethauer
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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: The La Silla Schmidt Southern Survey
The La Silla Schmidt Southern Survey Open
We present the La Silla Schmidt Southern Survey (LS4), a new wide-field, time-domain survey to be conducted with the 1 m ESO Schmidt telescope. The 268 megapixel LS4 camera mosaics 32 2k × 4k fully depleted CCDs, providing a ∼20 deg 2 fiel…
View article: The La Silla Schmidt Southern Survey
The La Silla Schmidt Southern Survey Open
We present the La Silla Schmidt Southern Survey (LS4), a new wide-field, time-domain survey to be conducted with the 1 m ESO Schmidt telescope. The 268 megapixel LS4 camera mosaics 32 2k$\times$4k fully depleted CCDs, providing a $\sim$20 …
View article: Rubin ToO 2024: Envisioning the Vera C. Rubin Observatory LSST Target of Opportunity program
Rubin ToO 2024: Envisioning the Vera C. Rubin Observatory LSST Target of Opportunity program Open
The Legacy Survey of Space and Time (LSST) at Vera C. Rubin Observatory is planned to begin in the Fall of 2025. The LSST survey cadence has been designed via a community-driven process regulated by the Survey Cadence Optimization Committe…
View article: Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation
Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation Open
The precise atomic structure and therefore the wavelength-dependent opacities of lanthanides are highly uncertain. This uncertainty introduces systematic errors in modeling transients like kilonovae and estimating key properties such as ma…
View article: Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation
Impact of Systematic Modeling Uncertainties on Kilonova Property Estimation Open
The precise atomic structure and therefore the wavelength-dependent opacities of lanthanides are highly uncertain. This uncertainty introduces systematic errors in modeling transients like kilonovae and estimating key properties such as ma…
View article: Roaring to Softly Whispering: X-Ray Emission after ∼3.7 yr at the Location of the Transient AT2018cow and Implications for Accretion-powered Scenarios*
Roaring to Softly Whispering: X-Ray Emission after ∼3.7 yr at the Location of the Transient AT2018cow and Implications for Accretion-powered Scenarios* Open
We present the first deep X-ray observations of luminous fast blue optical transient (LFBOT) AT 2018cow at ∼3.7 yr since discovery, together with the reanalysis of the observation at δ t ∼ 220 days. X-ray emission is significantly detected…
View article: SN 2023ixf in Messier 101: Photo-ionization of Dense, Close-in Circumstellar Material in a Nearby Type II Supernova
SN 2023ixf in Messier 101: Photo-ionization of Dense, Close-in Circumstellar Material in a Nearby Type II Supernova Open
We present UV and/or optical observations and models of SN 2023ixf, a type II supernova (SN) located in Messier 101 at 6.9 Mpc. Early time ( flash ) spectroscopy of SN 2023ixf, obtained primarily at Lick Observatory, reveals emission lines…
View article: Unprecedented X-Ray Emission from the Fast Blue Optical Transient AT2022tsd
Unprecedented X-Ray Emission from the Fast Blue Optical Transient AT2022tsd Open
We present the X-ray monitoring campaign of AT2022tsd in the time range δ t rest = 23–116 days rest-frame since discovery. With an initial 0.3–10 keV X-ray luminosity of L x ≈ 10 44 erg s −1 at δ t rest ≈ 23 days, AT2022tsd is the most lum…
View article: Scary Barbie: An Extremely Energetic, Long-duration Tidal Disruption Event Candidate without a Detected Host Galaxy at z = 0.995
Scary Barbie: An Extremely Energetic, Long-duration Tidal Disruption Event Candidate without a Detected Host Galaxy at z = 0.995 Open
We report multiwavelength observations and characterization of the ultraluminous transient AT 2021lwx (ZTF20abrbeie; aka “Barbie”) identified in the alert stream of the Zwicky Transient Facility (ZTF) using a Recommender Engine For Intelli…
View article: The Radio to GeV Afterglow of GRB 221009A
The Radio to GeV Afterglow of GRB 221009A Open
GRB 221009A ( z = 0.151) is one of the closest known long γ -ray bursts (GRBs). Its extreme brightness across all electromagnetic wavelengths provides an unprecedented opportunity to study a member of this still-mysterious class of transie…
View article: Scary Barbie: An Extremely Energetic, Long-Duration Tidal Disruption Event Candidate Without a Detected Host Galaxy at z = 0.995
Scary Barbie: An Extremely Energetic, Long-Duration Tidal Disruption Event Candidate Without a Detected Host Galaxy at z = 0.995 Open
We report multi-wavelength observations and characterization of the ultraluminous transient AT 2021lwx (ZTF20abrbeie; aka ``Barbie'') identified in the alert stream of the Zwicky Transient Facility (ZTF) using a Recommender Engine For Inte…
View article: The Radio to GeV Afterglow of GRB 221009A
The Radio to GeV Afterglow of GRB 221009A Open
GRB 221009A ($z=0.151$) is one of the closest known long $γ$-ray bursts (GRBs). Its extreme brightness across all electromagnetic wavelengths provides an unprecedented opportunity to study a member of this still-mysterious class of transie…
View article: Seven Years of Coordinated Chandra–NuSTAR Observations of SN 2014C Unfold the Extreme Mass-loss History of Its Stellar Progenitor
Seven Years of Coordinated Chandra–NuSTAR Observations of SN 2014C Unfold the Extreme Mass-loss History of Its Stellar Progenitor Open
We present the results from our 7 yr long broadband X-ray observing campaign of SN 2014C with Chandra and NuSTAR. These coordinated observations represent the first look at the evolution of a young extragalactic SN in the 0.3–80 keV energy…
View article: A Mildly Relativistic Outflow Launched Two Years after Disruption in Tidal Disruption Event AT2018hyz
A Mildly Relativistic Outflow Launched Two Years after Disruption in Tidal Disruption Event AT2018hyz Open
We present late-time radio/millimeter (as well as optical/UV and X-ray) detections of tidal disruption event (TDE) AT2018hyz, spanning 970–1300 d after optical discovery. In conjunction with earlier deeper limits, including those at ≈700 d…
View article: Evidence for Extended Hydrogen-Poor CSM in the Three-Peaked Light Curve of Stripped Envelope Ib Supernova
Evidence for Extended Hydrogen-Poor CSM in the Three-Peaked Light Curve of Stripped Envelope Ib Supernova Open
We present multi-band ATLAS photometry for SN 2019tsf, a stripped-envelope Type Ib supernova (SESN). The SN shows a triple-peaked light curve and a late (re-)brightening, making it unique among stripped-envelope systems. The re-brightening…
View article: A Mildly Relativistic Outflow Launched Two Years after Disruption in the\n Tidal Disruption Event AT2018hyz
A Mildly Relativistic Outflow Launched Two Years after Disruption in the\n Tidal Disruption Event AT2018hyz Open
We present late-time radio/millimeter (as well as optical/UV and X-ray)\ndetections of the tidal disruption event (TDE) AT2018hyz, spanning $970 - 1300$\nd after optical discovery. In conjunction with earlier deeper limits, including\nat $…
View article: Survival of the Fittest: Numerical Modeling of SN 2014C
Survival of the Fittest: Numerical Modeling of SN 2014C Open
Initially classified as a Type Ib supernova (SN), ∼100 days after the explosion SN 2014C made a transition to a Type II SN, presenting a gradual increase in the H α emission. This has been interpreted as evidence of interaction between the…
View article: Target-of-opportunity Observations of Gravitational-wave Events with Vera C. Rubin Observatory
Target-of-opportunity Observations of Gravitational-wave Events with Vera C. Rubin Observatory Open
The discovery of the electromagnetic counterpart to the binary neutron star (NS) merger GW170817 has opened the era of gravitational-wave multimessenger astronomy. Rapid identification of the optical/infrared kilonova enabled a precise loc…
View article: Radio and X-Ray Observations of the Luminous Fast Blue Optical Transient AT 2020xnd
Radio and X-Ray Observations of the Luminous Fast Blue Optical Transient AT 2020xnd Open
We present deep X-ray and radio observations of the fast blue optical transient (FBOT) AT 2020xnd/ZTF 20acigmel at z = 0.2433 from 13 days to 269 days after explosion. AT 2020xnd belongs to the category of optically luminous FBOTs with sim…
View article: Target of Opportunity Observations of Gravitational Wave Events with Vera C. Rubin Observatory
Target of Opportunity Observations of Gravitational Wave Events with Vera C. Rubin Observatory Open
The discovery of the electromagnetic counterpart to the binary neutron star merger GW170817 has opened the era of gravitational-wave multi-messenger astronomy. Rapid identification of the optical/infrared kilonova enabled a precise localiz…
View article: Radio and X-ray observations of the luminous Fast Blue Optical Transient AT2020xnd
Radio and X-ray observations of the luminous Fast Blue Optical Transient AT2020xnd Open
We present deep X-ray and radio observations of the Fast Blue Optical Transient (FBOT) AT2020xnd/ZTF20acigmel at $z=0.2433$ from $13$d to $269$d after explosion. AT2020xnd belongs to the category of optically luminous FBOTs with similariti…
View article: Survival of the Fittest: Numerical Modeling of Supernova 2014C
Survival of the Fittest: Numerical Modeling of Supernova 2014C Open
Initially classified as a supernova (SN) type Ib, $\sim$ 100 days after the explosion SN\,2014C made a transition to a SN type II, presenting a gradual increase in the H$α$ emission. This has been interpreted as evidence of interaction bet…
View article: Six Years of Luminous X-Ray Emission from the Strongly Interacting Type-Ib SN2014C Captured by Chandra and NuSTAR
Six Years of Luminous X-Ray Emission from the Strongly Interacting Type-Ib SN2014C Captured by Chandra and NuSTAR Open
We present the first coordinated soft and hard 0.3–80 keV X-ray campaign of the extragalactic supernova SN2014C in the first ∼2307 days of its evolution. SN2014C initially appeared to be an ordinary type Ib explosion but evolved into a str…