Bridging the gap: OPTICAM reveals the hidden spin of the WZ Sge star GOTO 065054.49+593624.51


Por: Castro Segura N., Irving Z.A., Vincentelli F.M., Altamirano D., Tampo Y., Knigge C., Pelisoli I., Coppejans D.L., Rawat N., Castro A., Sahu A., Hernández Santisteban J.V., Kimura M., Veresvarska M., Michel R., Scaringi S., Najera M.R.

Publicada: 1 ene 2025
Resumen:
WZ Sge stars are highly evolved accreting white dwarf systems (AWDs) exhibiting remarkably large amplitude outbursts (also known as superoutbursts), 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+ yr). 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 multiband observations with OPtical TIming CAMera of the recent outburst of the recently discovered WZ Sge star GOTO 065054.49+593624.51, during the end of the main outburst and the dip in-between rebrightenings, covering two orders of magnitude in brightness. Our observations reveal the presence of a statistically significant signal with s in the bluer (g) band, which is detected only during the dip between the main outburst and the rebrightenings. We interpret this signal as the spin period of the AWD. If confirmed, GOTO 065054.49+593624.51 would bridge the gap between intermediate- and fast-rotating intermediate polars below the period gap. © 2025 The Author(s).

Filiaciones:
Castro Segura N.:
 Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom

 Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom

Irving Z.A.:
 Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom

Vincentelli F.M.:
 Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom

Altamirano D.:
 Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom

Tampo Y.:
 South African Astronomical Observatory, PO Box 9, Observatory, Cape Town, 7935, South Africa

 Department of Astronomy, University of Cape Town, Private Bag X3 Cape Town, Rondebosch, 7701, South Africa

Knigge C.:
 Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom

Pelisoli I.:
 Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom

Coppejans D.L.:
 Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom

Rawat N.:
 South African Astronomical Observatory, PO Box 9, Observatory, Cape Town, 7935, South Africa

Castro A.:
 Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom

 Instituto de Astronomía, Universidad Nacional Autónoma de México, Carretera Tijuana-Ensenada Km. 107, B.C., Ensenada, 22860, Mexico

Sahu A.:
 Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom

Hernández Santisteban J.V.:
 SUPA School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, United Kingdom

Kimura M.:
 Advanced Research Center for Space Science and Technology, College of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192, Japan

Veresvarska M.:
 Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham, DH1 3LE, United Kingdom

Michel R.:
 Instituto de Astronomía, Universidad Nacional Autónoma de México, Carretera Tijuana-Ensenada Km. 107, B.C., Ensenada, 22860, Mexico

Scaringi S.:
 Centre for Extragalactic Astronomy, Department of Physics, Durham University, South Road, Durham, DH1 3LE, United Kingdom

 NAF - Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, Naples, I-80131, Italy

Najera M.R.:
 Instituto de Astronomía, Universidad Nacional Autónoma de México, Carretera Tijuana-Ensenada Km. 107, B.C., Ensenada, 22860, Mexico
ISSN: 17453933
Editorial
Blackwell Publishing Ltd, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND, Reino Unido
Tipo de documento: Article
Volumen: 541 Número: 1
Páginas: 28-34

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