T. Killestein
YOU?
Author Swipe
View article: Discovery and analysis of afterglows from poorly localized GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey
Discovery and analysis of afterglows from poorly localized GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey Open
Gamma-ray bursts (GRBs), particularly those detected by wide-field instruments such as the Fermi/GBM, pose challenges for optical follow-up because of their large initial localization regions, leaving many GRBs without identified afterglow…
View article: SN 2024bfu, SN 2025qe, and the early light curves of type Iax supernovae
SN 2024bfu, SN 2025qe, and the early light curves of type Iax supernovae Open
Type Iax supernovae (SNe Iax) are one of the most common subclasses of thermonuclear supernova and yet their sample size, particularly those observed shortly after explosion, remains relatively small. In this paper, we present photometric …
View article: GRB 241105A: a test case for GRB classification and rapid <i>r</i> -process nucleosynthesis channels
GRB 241105A: a test case for GRB classification and rapid <i>r</i> -process nucleosynthesis channels Open
Gamma-ray bursts (GRBs) offer a powerful window to probe the progenitor systems responsible for the formation of heavy elements through the rapid neutron capture (r-) process, thanks to their exceptional luminosity, which allows them to be…
View article: SN 2024hpj: a perspective on SN 2009ip-like events
SN 2024hpj: a perspective on SN 2009ip-like events Open
Supernovae (SNe) IIn are terminal explosions of massive stars that are surrounded by a dense circumstellar medium (CSM). Among SNe IIn, a notable subset is the SNe 2009ip-like, which exhibit an initial, fainter peak attributed to stellar v…
View article: A long-lasting eruption heralds SN 2023ldh, a clone of SN 2009ip
A long-lasting eruption heralds SN 2023ldh, a clone of SN 2009ip Open
We discuss the results of the spectroscopic and photometric monitoring of the type IIn supernova (SN) 2023ldh. Survey archive data show that the SN progenitor experienced erratic variability in the years before exploding. Beginning May 202…
View article: GRB 241105A: A test case for GRB classification and rapid r-process nucleosynthesis channels
GRB 241105A: A test case for GRB classification and rapid r-process nucleosynthesis channels Open
Gamma-ray bursts (GRBs) offer a powerful window to probe the progenitor systems responsible for the formation of heavy elements through the rapid neutron capture (r-) process, thanks to their exceptional luminosity, which allows them to be…
View article: Luminous, rapidly declining supernovae as stripped transitional objects in low-metallicity environments: The case of SN 2022lxg
Luminous, rapidly declining supernovae as stripped transitional objects in low-metallicity environments: The case of SN 2022lxg Open
We present an analysis of the optical and near-infrared properties of SN 2022lxg, a bright ( M g peak = −19.41 mag) and rapidly evolving supernova (SN). It was discovered within a day of explosion, and rose to peak brightness in ∼10 d. Two…
View article: GOTO065054+593624: An 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers
GOTO065054+593624: An 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers Open
Dwarf novae are astrophysical laboratories for probing the nature of accretion, binary mass transfer, and binary evolution, but their diverse observational characteristics continue to challenge our theoretical understanding. We here presen…
View article: The Double Tidal Disruption Event AT 2022dbl Implies that at Least Some “Standard” Optical Tidal Disruption Events Are Partial Disruptions
The Double Tidal Disruption Event AT 2022dbl Implies that at Least Some “Standard” Optical Tidal Disruption Events Are Partial Disruptions Open
Flares produced following the tidal disruption of stars by supermassive black holes can reveal the properties of the otherwise dormant majority of black holes and the physics of accretion. In the past decade, a class of optical-ultraviolet…
View article: SN 2024bfu, SN 2025qe, and the early light curves of type Iax supernovae
SN 2024bfu, SN 2025qe, and the early light curves of type Iax supernovae Open
Type Iax supernovae (SNe Iax) are one of the most common subclasses of thermonuclear supernova and yet their sample size, particularly those observed shortly after explosion, remains relatively small. In this paper we present photometric a…
View article: The Double Tidal Disruption Event AT 2022dbl Implies That at Least Some "Standard" Optical TDEs are Partial Disruptions
The Double Tidal Disruption Event AT 2022dbl Implies That at Least Some "Standard" Optical TDEs are Partial Disruptions Open
Flares produced following the tidal disruption of stars by supermassive black holes can reveal the properties of the otherwise dormant majority of black holes and the physics of accretion. In the past decade, a class of optical-ultraviolet…
View article: Optical evolution of AT 2024wpp: the high-velocity outflows in Cow-like transients are consistent with high spherical symmetry
Optical evolution of AT 2024wpp: the high-velocity outflows in Cow-like transients are consistent with high spherical symmetry Open
We present the analysis of optical/near-infrared (NIR) data and host galaxy properties of a bright, extremely rapidly evolving transient, AT 2024wpp, which resembles the enigmatic AT 2018cow. AT 2024wpp rose to a peak brightness of $c=-21.…
View article: GOTO065054+593624: a 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers
GOTO065054+593624: a 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers Open
Dwarf novae are astrophysical laboratories for probing the nature of accretion, binary mass transfer, and binary evolution -- yet their diverse observational characteristics continue to challenge our theoretical understanding. We here pres…
View article: SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient
SN 2023xwi: Forbidden line emission in the peak spectrum of a Ca-strong transient Open
We present an extensive optical photometric and spectroscopic investigation into the calcium-rich supernova (SN) – SN2023xwi. Observations from a variety of ground-based telescopes follow the SN from 8 days pre-peak brightness to 87 days p…
View article: SN 2023tsz: a helium-interaction-driven supernova in a very low-mass galaxy
SN 2023tsz: a helium-interaction-driven supernova in a very low-mass galaxy Open
SN 2023tsz is a Type Ibn supernova (SN Ibn), an uncommon subtype of stripped-envelope core-collapse supernovae (SNe), discovered in an extremely low-mass host. SNe Ibn are characterized by narrow helium emission lines in their spectra and …
View article: Leveraging Movement Representation from Contrastive Learning for Asteroid Detection
Leveraging Movement Representation from Contrastive Learning for Asteroid Detection Open
To support asteroid-related studies, current motion detectors are utilized to select moving object candidates based on their visualizations and movements in sequences of sky exposures. However, the existing detectors encounter the manual p…
View article: Optical evolution of AT 2024wpp: the high-velocity outflows in Cow-like transients are consistent with high spherical symmetry
Optical evolution of AT 2024wpp: the high-velocity outflows in Cow-like transients are consistent with high spherical symmetry Open
We present the analysis of optical data of a bright and extremely-rapidly evolving transient, AT2024wpp, whose properties are similar to the enigmatic AT2018cow (aka the Cow). AT2024wpp rose to a peak brightness of c=-21.9mag in 4.3d and r…
View article: SN 2023tsz: A helium-interaction driven supernova in a very low-mass galaxy
SN 2023tsz: A helium-interaction driven supernova in a very low-mass galaxy Open
SN 2023tsz is a Type Ibn supernova (SNe Ibn) discovered in an extremely low-mass host. SNe Ibn are an uncommon subtype of stripped-envelope core-collapse SNe. They are characterised by narrow helium emission lines in their spectra and are …
View article: <i>Kilonova Seekers</i>: the GOTO project for real-time citizen science in time-domain astrophysics
<i>Kilonova Seekers</i>: the GOTO project for real-time citizen science in time-domain astrophysics Open
Time-domain astrophysics continues to grow rapidly, with the inception of new surveys drastically increasing data volumes. Democratized, distributed approaches to training sets for machine learning classifiers are crucial to make the most …
View article: $\textit{Kilonova Seekers}$: the GOTO project for real-time citizen science in time-domain astrophysics
$\textit{Kilonova Seekers}$: the GOTO project for real-time citizen science in time-domain astrophysics Open
Time-domain astrophysics continues to grow rapidly, with the inception of new surveys drastically increasing data volumes. Democratised, distributed approaches to training sets for machine learning classifiers are crucial to make the most …
View article: Quantitative modelling of type Ia supernovae spectral time series: constraining the explosion physics
Quantitative modelling of type Ia supernovae spectral time series: constraining the explosion physics Open
Multiple explosion mechanisms have been proposed to explain type Ia supernovae (SNe Ia). Empirical modelling tools have also been developed that allow for fast, customized modelling of individual SNe and direct comparisons between observat…
View article: Quantitative modelling of type Ia supernovae spectral time series: Constraining the explosion physics
Quantitative modelling of type Ia supernovae spectral time series: Constraining the explosion physics Open
Multiple explosion mechanisms have been proposed to explain type Ia supernovae (SNe Ia). Empirical modelling tools have also been developed that allow for fast, customised modelling of individual SNe and direct comparisons between observat…
View article: GRB 230911A: The First Discovery of a Fermi GRB Optical Counterpart with the Gravitational-wave Optical Transient Observer (GOTO)
GRB 230911A: The First Discovery of a Fermi GRB Optical Counterpart with the Gravitational-wave Optical Transient Observer (GOTO) Open
We report on the detection of candidate optical counterpart GOTO23akf/AT2023shv to the GRB 230911A with the Gravitational-wave Optical Transient Observer (GOTO) instruments located at La Palma, Canary Islands, and Siding Spring Observatory…
View article: Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data with Corrected Orbital Ephemeris
Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data with Corrected Orbital Ephemeris Open
Improved observational constraints on the orbital parameters of the low-mass X-ray binary Scorpius X-1 were recently published in Killestein et al. In the process, errors were corrected in previous orbital ephemerides, which have been used…
View article: Photometric study of the late-time near-infrared plateau in Type Ia supernovae
Photometric study of the late-time near-infrared plateau in Type Ia supernovae Open
We present an in-depth study of the late-time near-infrared plateau in Type Ia supernovae (SNe Ia), which occurs between 70 and 500 d. We double the existing sample of SNe Ia observed during the late-time near-infrared plateau with new obs…
View article: Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data With Corrected Orbital Ephemeris
Search for Gravitational Waves from Scorpius X-1 in LIGO O3 Data With Corrected Orbital Ephemeris Open
Improved observational constraints on the orbital parameters of the low-mass X-ray binary Scorpius~X-1 were recently published in Killestein et al (2023). In the process, errors were corrected in previous orbital ephemerides, which have be…
View article: Precision Ephemerides for Gravitational-wave Searches – IV. Corrected and refined ephemeris for Scorpius X-1
Precision Ephemerides for Gravitational-wave Searches – IV. Corrected and refined ephemeris for Scorpius X-1 Open
Low-mass X-ray binaries have long been theorized as potential sources of continuous gravitational-wave radiation, yet there is no observational evidence from recent LIGO/Virgo observing runs. Even for the theoretically ‘loudest’ source, Sc…
View article: Precision Ephemerides for Gravitational-wave Sources+
Precision Ephemerides for Gravitational-wave Sources+ Open
Zenodo repository containing datasets and ephemeris predictions from the Precision Ephemerides for Gravitational-wave Searches project. New ephemerides will be published here, and updated incrementally as new data is acquired.
View article: Precision Ephemerides for Gravitational-wave Sources+
Precision Ephemerides for Gravitational-wave Sources+ Open
Zenodo repository containing datasets and ephemeris predictions from the Precision Ephemerides for Gravitational-wave Searches project. New ephemerides will be published here, and updated incrementally as new data is acquired. Version hist…