122 citations · 3.4k across the 145 of their papers we have counts for
12 papers · 1 filter
An X-Ray-dim "Isolated'' Neutron Star in a Binary?
Jie Lin, Chunqian Li, Weiyang Wang +13
We report the discovery of a dark companion to 2MASS J15274848+3536572 with an orbital period of 6.14 hr. Combining the radial velocity from LAMOST observations and modelling of th…
A magnetic valve at L1 revealed in TESS photometry of the asynchronous polar BY Cam
Paul A. Mason, Colin Littlefield, Lorena C. Monroy +7
We present TESS photometry of the asynchronous polar BY Cam, which undergoes a beat-cycle between the 199.384-min white dwarf (WD) spin period and the 201.244-min orbital period. T…
The Gravitational-wave Optical Transient Observer (GOTO)
Martin J. Dyer, Kendall Ackley, Joe Lyman +12
The Gravitational-wave Optical Transient Observer (GOTO) is a wide-field telescope project focused on detecting optical counterparts to gravitational-wave sources. Each GOTO roboti…
Short Duration Accretion States of Polars as seen in TESS and ZTF data
C. Duffy, G. Ramsay, Kinwah Wu +4
Polars are highly magnetic cataclysmic variables which have been long observed to have both high and low brightness states. The duration of these states has been previously seen to…
A TESS search for donor-star pulsations in High-Mass X-ray Binaries
Gavin Ramsay, Pasi Hakala, Philip A. Charles
Ground-based optical photometry of the counterparts of High-Mass X-ray Binaries (HMXBs) has revealed the presence of periodic modulations on timescales of ~0.3-0.5 d. More recent s…
Searching for stellar flares from low mass stars using ASKAP and TESS
Jeremy Rigney, Gavin Ramsay, Eoin P. Carley +7
Solar radio emission at low frequencies (<1 GHz) can provide valuable information on processes driving flares and coronal mass ejections (CMEs). Radio emission has been detected fr…
Doubling of minute-long Quasi-Periodic Pulsations from super-flares on a low mass star
J. Gerry Doyle, Puji Irawati, Dmitrii Y. Kolotkov +5
Using the ULTRASPEC instrument mounted on the 2.4-m Thai National Telescope, we observed two large flares, each with a total energy close to 10^34 erg with sub-second cadence. A co…
Circular Polarimetry of Suspect Wind-accreting Magnetic pre-Polars
Pasi Hakala, Steven G. Parsons, Thomas R. Marsh +4
We present results from a circular polarimetric survey of candidate detached magnetic white dwarf - M dwarf binaries obtained using the Nordic Optical Telescope, La Palma. We obtai…
The OmegaWhite Survey for Short-Period Variable Stars VII: High amplitude, short period blue variables
G. Ramsay, P. A. Woudt, T. Kupfer +11
Blue Large Amplitude Pulsators (BLAPs) are a relatively new class of blue variable stars showing periodic variations in their light curves with periods shorter than a few tens of m…
The OmegaWhite Survey for Short Period Variable Stars VI. Open Clusters
R. Toma, G. Ramsay, C. S. Jeffery +3
Using light curves with 3 min cadence and a duration of 2 hrs made using the OmegaWhite survey, we present the results of a search for short-period variable stars in the fiel…
The Puzzling Story of Flare Inactive Ultra Fast Rotating M dwarfs. I. Exploring their Magnetic Fields
Lauren Doyle, Stefano Bagnulo, Gavin Ramsay +2
Stars which are rapidly rotating are expected to show high levels of activity according to the activity-rotation relation. However, previous TESS studies have found Ultra Fast Rota…
The Puzzling Story of Flare Inactive Ultra Fast Rotating M dwarfs. II. Searching for radial velocity variations
Gavin Ramsay, Pasi Hakala, J. Gerry Doyle +2
Observations made using TESS revealed a sample of low mass stars which show a periodic modulation on a period ~d. Surprisingly many of these Ultra Fast Rotating (UFR) stars s…