T. Schweyer
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View article: SN 2019odp – A massive oxygen-rich Type Ib supernova
SN 2019odp – A massive oxygen-rich Type Ib supernova Open
Aims. Stripped envelope (SE) supernovae are explosions of stars that have somehow lost most of their outer envelopes. We present the discovery and analyse the observations of the Type Ib supernova 2019odp (a.k.a. ZTF19abqwtfu) covering epo…
View article: ZTF SN Ia DR2: Overview
ZTF SN Ia DR2: Overview Open
We present the first homogeneous release of several thousand Type Ia supernovae (SNe Ia), all having spectroscopic classification, and spectroscopic redshifts for half the sample. This release, named the "DR2", contains 3628 nearby (z < 0.…
View article: The GROND gamma-ray burst sample
The GROND gamma-ray burst sample Open
A dedicated gamma-ray burst (GRB) afterglow observing program was performed between 2007 and 2016 with GROND, a seven-channel optical and near-infrared imager at the 2.2m telescope of the Max-Planck Society at ESO/La Silla, In this first o…
View article: A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign
A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign Open
We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. No statistically si…
View article: Collapsars as Sites of r-process Nucleosynthesis: Systematic Photometric Near-infrared Follow-up of Type Ic-BL Supernovae
Collapsars as Sites of r-process Nucleosynthesis: Systematic Photometric Near-infrared Follow-up of Type Ic-BL Supernovae Open
One of the open questions following the discovery of GW170817 is whether neutron star (NS) mergers are the only astrophysical sites capable of producing r -process elements. Simulations have shown that 0.01–0.1 M ⊙ of r -process material c…
View article: A Systematic Study of Ia-CSM Supernovae from the ZTF Bright Transient Survey
A Systematic Study of Ia-CSM Supernovae from the ZTF Bright Transient Survey Open
Among the supernovae (SNe) that show strong interaction with a circumstellar medium (CSM), there is a rare subclass of Type Ia supernovae, SNe Ia-CSM, which show strong narrow hydrogen emission lines much like SNe IIn but on top of a dilut…
View article: SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy
SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-shell Detonation in a Star-forming Galaxy Open
The detonation of a thin (≲0.03 M ⊙ ) helium shell (He-shell) atop a ∼1 M ⊙ white dwarf (WD) is a promising mechanism to explain normal Type Ia supernovae (SNe Ia), while thicker He-shells and less massive WDs may explain some recently obs…
View article: SN 2019odp: A Massive Oxygen-Rich Type Ib Supernova
SN 2019odp: A Massive Oxygen-Rich Type Ib Supernova Open
We present and analyze observations of the Type Ib supernova (SN) 2019odp (a.k.a ZTF19abqwtfu) covering epochs within days of the explosion to the nebular phase at 360 d post-explosion. We discuss them in the context of recombination cooli…
View article: Collapsars as Sites of r-process Nucleosynthesis: Systematic Near-Infrared Follow-up of Type Ic-BL Supernovae
Collapsars as Sites of r-process Nucleosynthesis: Systematic Near-Infrared Follow-up of Type Ic-BL Supernovae Open
One of the open questions following the discovery of GW170817 is whether neutron star mergers are the only astrophysical sites capable of producing $r$-process elements. Simulations have shown that 0.01-0.1M$_\odot$ of $r$-process material…
View article: SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-Shell\n Detonation in a Star-Forming Galaxy
SN 2020jgb: A Peculiar Type Ia Supernova Triggered by a Helium-Shell\n Detonation in a Star-Forming Galaxy Open
The detonation of a thin ($\\lesssim$$0.03\\,\\mathrm{M_\\odot}$) helium shell\n(He-shell) atop a $\\sim$$1\\,\\mathrm{M_\\odot}$ white dwarf (WD) is a promising\nmechanism to explain normal Type Ia supernovae (SNe Ia), while thicker\nHe-s…
View article: Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino
Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino Open
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE candidate, coincide…
View article: Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr)
Photometric and spectroscopic evolution of the interacting transient AT 2016jbu(Gaia16cfr) Open
We present the results from a high-cadence, multiwavelength observation campaign of AT 2016jbu (aka Gaia16cfr), an interacting transient. This data set complements the current literature by adding higher cadence as well as extended coverag…
View article: Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino
Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino Open
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE candidate, coincide…
View article: Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino
Candidate Tidal Disruption Event AT2019fdr Coincident with a High-Energy Neutrino Open
The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one high-energy neutrino was associated with a tidal disruption event (TDE). Here we present AT2019fdr, an exceptionally luminous TDE candidate, coincide…
View article: SN 2018bsz: significant dust formation in a nearby superluminous supernova
SN 2018bsz: significant dust formation in a nearby superluminous supernova Open
We investigate the thermal emission and extinction from dust associated with the nearby superluminous supernova (SLSN) 2018bsz. Our dataset has daily cadence and simultaneous optical and near-infrared coverage up to ~ 100 days, together wi…
View article: A low-energy explosion yields the underluminous Type IIP SN 2020cxd
A low-energy explosion yields the underluminous Type IIP SN 2020cxd Open
Context. We present our observations and analysis of SN 2020cxd, a low-luminosity (LL), long-lived Type IIP supernova (SN). This object is a clear outlier in the magnitude-limited SN sample recently presented by the Zwicky Transient Facili…
View article: SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn
SN 2017ens: The Metamorphosis of a Luminous Broadlined Type Ic Supernova into an SN IIn Open
We present observations of supernova (SN) 2017ens, discovered by the ATLAS survey and identified as a hot blue object through the GREAT program. The redshift z = 0.1086 implies a peak brightness of M g = −21.1 mag, placing the object withi…
View article: Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters
Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters Open
Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the binary black hole (B…
View article: Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ 287 on Timescales Ranging from Decades to Hours
Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ 287 on Timescales Ranging from Decades to Hours Open
We present the results of our power spectral density analysis for the BL Lac object OJ 287, utilizing the Fermi -LAT survey at high-energy γ -rays, Swift -XRT in X-rays, several ground-based telescopes and the Kepler satellite in the optic…
View article: Large-amplitude late-time radio variability in GRB 151027B
Large-amplitude late-time radio variability in GRB 151027B Open
\nContext. Deriving physical parameters from gamma-ray burst (GRB) afterglow observations remains a challenge, even 20 years after the discovery of afterglows. The main reason for the lack of progress is that the peak of the synchrotron em…
View article: GRB 151027B - large-amplitude late-time radio variability
GRB 151027B - large-amplitude late-time radio variability Open
Deriving physical parameters from gamma-ray burst afterglow observations remains a challenge, even now, 20 years after the discovery of afterglows. The main reason for the lack of progress is that the peak of the synchrotron emission is in…
View article: Long optical plateau in the afterglow of the short GRB 150424A with extended emission - Evidence for energy injection by a magnetar?
Long optical plateau in the afterglow of the short GRB 150424A with extended emission - Evidence for energy injection by a magnetar? Open
Short-duration gamma-ray bursts (GRBs) with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) because of their lower luminosity.…
View article: Spatially Resolved MaNGA Observations of the Host Galaxy of Superluminous Supernova 2017egm
Spatially Resolved MaNGA Observations of the Host Galaxy of Superluminous Supernova 2017egm Open
Superluminous supernovae (SLSNe) are found predominantly in dwarf galaxies, indicating that their progenitors have a low metallicity. However, the most nearby SLSN to date, SN 2017egm, occurred in the spiral galaxy NGC 3191, which has a re…
View article: Long optical plateau in the afterglow of the short GRB 150424A with extended emission
Long optical plateau in the afterglow of the short GRB 150424A with extended emission Open
\n Context. Short-duration gamma-ray bursts (GRBs) with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) because of their lower…
View article: A long optical plateau in the afterglow of the Extended Emission short GRB 150424A: Evidence for energy injection by a magnetar?
A long optical plateau in the afterglow of the Extended Emission short GRB 150424A: Evidence for energy injection by a magnetar? Open
Short-duration GRBs with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) due to their smaller luminosity. We present a multi-b…
View article: A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign
A Search for QPOs in the Blazar OJ287: Preliminary Results from the 2015/2016 Observing Campaign Open
We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. No statistically si…
View article: Search for QPOs in the Light Curve of the Blazar OJ287: Preliminary Results from 2015/16 Observing Campaign
Search for QPOs in the Light Curve of the Blazar OJ287: Preliminary Results from 2015/16 Observing Campaign Open
We analyse the light curve in the R-band gathered during the 2015/16 observing season of OJ287. We did a search for QPOs using several methods in wide time domain. No statistically significant periods were found in the high frequency domai…