Gavin Ramsay
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View article: HiPERCAM and TESS observations of the rapidly rotating M7V star LP 89–187
HiPERCAM and TESS observations of the rapidly rotating M7V star LP 89–187 Open
The discovery of a significant number of rapidly rotating low-mass stars showing no or few flares in TESS observations was a surprise, as rapid rotation has previously been linked to high stellar activity. Here we present TESS and HiPERCAM…
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: HiPERCAM and TESS observations of the rapidly rotating M7V star LP 89--187
HiPERCAM and TESS observations of the rapidly rotating M7V star LP 89--187 Open
The discovery of a significant number of rapidly rotating low mass stars showing no or few flares in TESS observations was a surprise as rapid rotation has previously been taken as implying high stellar activity. Here we present TESS and H…
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: Discovery and Analysis of Afterglows from Poorly Localised GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey
Discovery and Analysis of Afterglows from Poorly Localised 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 a challenge for optical follow-up due to their large initial localisation regions, leaving many GRBs without identified afterglows. …
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: NuSTAR Broadband X-Ray Observation of EF Eri Following its Reawakening into a High Accretion State
NuSTAR Broadband X-Ray Observation of EF Eri Following its Reawakening into a High Accretion State Open
We present the first NuSTAR X-ray observation of EF Eri, a well-known polar system. The NuSTAR observation was conducted in conjunction with NICER shortly after EF Eri entered a high accretion state following an unprecedented period of low…
View article: The PLATO mission
The PLATO mission Open
PLATO (PLAnetary Transits and Oscillations of stars) is ESA’s M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large number of stars. PLATO will detect small planets (down to ) ar…
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: Stellar X-Ray Variability and Planetary Evolution in the DS Tucanae System
Stellar X-Ray Variability and Planetary Evolution in the DS Tucanae System Open
We present an analysis of four Chandra observations of the 45 Myr old DS Tuc binary system. We observed X-ray variability of both stars on timescales from hours to months, including two strong X-ray flares from star A. The implied flaring …
View article: The PLATO field selection process
The PLATO field selection process Open
PLAnetary Transits and Oscillations of stars (PLATO) is an ESA M-class mission to be launched by the end of 2026 to discover and characterize transiting planets around bright and nearby stars, and in particular habitable rocky planets host…
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: The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field
The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field Open
PLAnetary Transits and Oscillations of stars (PLATO) is an ESA M-class mission to be launched by the end of 2026 to discover and characterize transiting planets around bright and nearby stars, and in particular habitable rocky planets host…
View article: Stellar X-ray variability and planetary evolution in the DS Tucanae system
Stellar X-ray variability and planetary evolution in the DS Tucanae system Open
We present an analysis of four Chandra observations of the 45 Myr old DS Tuc binary system. We observed X-ray variability of both stars on timescales from hours to months, including two strong X-ray flares from star A. The implied flaring …
View article: Cataclysmic Variables and AM CVn Binaries in SRG/eROSITA + Gaia: Volume Limited Samples, X-Ray Luminosity Functions, and Space Densities
Cataclysmic Variables and AM CVn Binaries in SRG/eROSITA + Gaia: Volume Limited Samples, X-Ray Luminosity Functions, and Space Densities Open
We present volume-limited samples of cataclysmic variables (CVs) and AM CVn binaries jointly selected from SRG/eROSITA eRASS1 and Gaia DR3 using an X-ray + optical color–color diagram (the “X-ray Main Sequence”). This tool identifies all C…
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: NuSTAR broadband X-ray observation of EF Eri following its reawakening into a high accretion state
NuSTAR broadband X-ray observation of EF Eri following its reawakening into a high accretion state Open
We present the first NuSTAR X-ray observation of EF Eri, a well-known polar system. The NuSTAR observation was conducted in conjunction with NICER, shortly after EF Eri entered a high accretion state following an unprecedented period of lo…
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: NGTS-31b and NGTS-32b: two inflated hot Jupiters orbiting subgiant stars
NGTS-31b and NGTS-32b: two inflated hot Jupiters orbiting subgiant stars Open
We present the discoveries of NGTS-31b(= TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 d, 1.61 and 1.42 …
View article: NGTS-33b: a young super-Jupiter hosted by a fast-rotating massive hot star
NGTS-33b: a young super-Jupiter hosted by a fast-rotating massive hot star Open
In the last few decades, planet search surveys have been focusing on solar-type stars, and only recently the high-mass regimes. This is mostly due to challenges arising from the lack of instrumental precision, and more importantly, the inh…
View article: Characterizing high and low accretion states in VY Scl CVs using ZTF and <i>TESS</i> data
Characterizing high and low accretion states in VY Scl CVs using ZTF and <i>TESS</i> data Open
VY Scl binaries are a sub-class of cataclysmic variable (CV) which show extended low states, but do not show outbursts which are seen in other classes of CV. To better determine how often these systems spend in low states and to resolve th…
View article: NGTS-33b: A Young Super-Jupiter Hosted by a Fast Rotating Massive Hot Star
NGTS-33b: A Young Super-Jupiter Hosted by a Fast Rotating Massive Hot Star Open
In the last few decades planet search surveys have been focusing on solar type stars, and only recently the high-mass regimes. This is mostly due to challenges arising from the lack of instrumental precision, and more importantly, the inhe…
View article: The BlackGEM Telescope Array. I. Overview
The BlackGEM Telescope Array. I. Overview Open
The main science aim of the BlackGEM array is to detect optical counterparts to gravitational wave mergers. Additionally, the array will perform a set of synoptic surveys to detect Local Universe transients and short timescale variability …
View article: A Broadband X-Ray Investigation of Fast-spinning Intermediate Polar CTCV J2056–3014
A Broadband X-Ray Investigation of Fast-spinning Intermediate Polar CTCV J2056–3014 Open
We report on XMM-Newton, NuSTAR, and NICER X-ray observations of CTCV J2056–3014, a cataclysmic variable (CV) with one of the fastest-spinning white dwarfs (WDs) at P = 29.6 s. While previously classified as an intermediate polar, CJ2056 a…
View article: Cataclysmic Variables and AM CVn Binaries in SRG/eROSITA + Gaia: Volume Limited Samples, X-ray Luminosity Functions, and Space Densities
Cataclysmic Variables and AM CVn Binaries in SRG/eROSITA + Gaia: Volume Limited Samples, X-ray Luminosity Functions, and Space Densities Open
We present volume-limited samples of cataclysmic variables (CVs) and AM CVn binaries jointly selected from SRG/eROSITA eRASS1 and \textit{Gaia} DR3 using an X-ray + optical color-color diagram (the ``X-ray Main Sequence"). This tool identi…
View article: TOI-2490b – the most eccentric brown dwarf transiting in the brown dwarf desert
TOI-2490b – the most eccentric brown dwarf transiting in the brown dwarf desert Open
We report the discovery of the most eccentric transiting brown dwarf in the brown dwarf desert, TOI-2490b. The brown dwarf desert is the lack of brown dwarfs around main-sequence stars within $\sim 3$ au and is thought to be caused by diff…
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: TOI-2490b- The most eccentric brown dwarf transiting in the brown dwarf desert
TOI-2490b- The most eccentric brown dwarf transiting in the brown dwarf desert Open
We report the discovery of the most eccentric transiting brown dwarf in the brown dwarf desert, TOI02490b. The brown dwarf desert is the lack of brown dwarfs around main sequence stars within $\sim3$~AU and is thought to be caused by diffe…
View article: GERry: A Code to Optimise the Hunt for the Electromagnetic Counter-parts to Gravitational Wave Events
GERry: A Code to Optimise the Hunt for the Electromagnetic Counter-parts to Gravitational Wave Events Open
The search for the electromagnetic counterparts to gravitational wave (GW) events has been rapidly gathering pace in recent years thanks to the increasing number and capabilities of both gravitational wave detectors and wide field survey t…