Bridging the Gap: OPTICAM Reveals the Hidden Spin of the WZ Sge Star GOTO 065054.49+593624.51
arXiv:2501.11669 · doi:10.1093/mnrasl/slaf038
Abstract
WZ Sge stars are highly evolved accreting white dwarf systems (AWDs) exhibiting remarkably large amplitude outbursts (a.k.a. super-outbursts), typically followed by short rebrightenings/echo outbursts. These systems have some of the lowest mass transfer rates among AWDs, making even low magnetic fields dynamically important. Such magnetic fields are often invoked to explain the phenomenology observed in these systems, such as their X-ray luminosity and long periods of quiescence (30+ years). However, the detection of these is very elusive given the quenching of the accretion columns during outburst and the low luminosity of these systems during quiescence. Here we present high-cadence multi-band observations with {\it OPTICAM} of the recent outburst of the recently discovered WZ Sge star GOTO065054.49+593624.51, during the end of the main outburst and the dip in-between rebrightenings, covering 2 orders of magnitude in brightness. Our observations reveal the presence of a statistically significant signal with seconds in the bluer () band which is detected only during the dip between the main outburst and the rebrigthenings. We interpret this signal as the spin period of the AWD. If confirmed, GOTO 0650 would bridge the gap between intermediate- and fast-rotating intermediate polars (IPs) below the period gap.
arXiv commentAccepted in MRNAS
References in corpus (32)
- The Zwicky Transient Facility: System Overview, Performance, and First Results
- Cosmic-Ray Rejection by Laplacian Edge Detection
- Understanding the Lomb-Scargle Periodogram
- On characterising the variability properties of X-ray light curves from active galaxies
- The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
- A Unified Description of the Timing Features of Accreting X-ray Binaries
- A simple test for periodic signals in red noise
- The Zwicky Transient Facility: Surveys and Scheduler
- Post-common-envelope binaries from SDSS. XI: The white dwarf mass distributions of CVs and pre-CVs
- Superhumps in Cataclysmic Binaries. XXV. q_crit, epsilon(q), and Mass-Radius
- Locking of the Rotation of Disk-Accreting Magnetized Stars
- A review of the disc instability model for dwarf novae, soft X-ray transients and related objects
- HS2331+3905: The cataclysmic variable that has it all
- WZ Sge-Type Dwarf Novae
- Effective Temperatures of Cataclysmic Variable White Dwarfs as a Probe of their Evolution
- Black hole accretion discs
- VLT/FORS spectroscopy of faint cataclysmic variables discovered by the Sloan Digital Sky Survey
- A universal relation for the propeller mechanisms in magnetic rotating stars at different scales
- Dwarf Nova Oscillations and Quasi-Periodic Oscillations in Cataclysmic Variables: I. Observations of VW Hyi
- Thermal-viscous instability in tilted accretion disks: a possible application to IW And-type dwarf novae
- A double-frequency dwarf nova oscillation
- Quasi-periodic oscillations in the TESS light curve of TX Col, a diskless intermediate polar on the precipice of forming an accretion disk
- A Super-Eddington Wind Scenario for the Progenitors of Type Ia Supernovae
- GW Librae: A unique laboratory for pulsations in an accreting white dwarf
- Remarkable spectral variability on the spin period of the accreting white dwarf in V455 And
- CC Sculptoris: A superhumping intermediate polar
- ASASSN-16dt and ASASSN-16hg: Promising Candidates for a Period Bouncer
- Bow-shocks, nova shells, disc winds and tilted discs: The Nova-Like V341 Ara Has It All
- Discovery of 15-second oscillations in Hubble Space Telescope observations of WZ Sagittae following the 2001 outburst
- Discovery of Persistent Quasi-Periodic Oscillations in Accreting White Dwarfs: A New Link to X-ray Binaries
- OPTICAM: A triple-camera optical system designed to explore the fastest timescales in Astronomy
- ASASSN-18fk: A new WZ Sge-type dwarf nova with multiple rebrightenings and a new candidate for a superhumping intermediate polar