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A 5.3-minute-period pulsing white dwarf in a binary detected from radio to X-rays

White dwarf stars are the most common stellar fossils. When in binaries, they make up the dominant form of compact object binary within the Galaxy and can offer insight into different aspects of binary formation and evolution. One of the most remarka

Externí odkaz: http://arxiv.org/abs/2306.09272

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Multi-colour optical light curves of the companion star to the millisecond pulsar PSR J2051-0827

Autor: Dhillon, V. S., Kennedy, M. R., Breton, R. P., Clark, C. J., Sánchez, D. Mata, Voisin, G., Breedt, E., Brown, A. J., Dyer, M. J., Green, M. J., Kerry, P., Littlefair, S. P., Marsh, T. R., Parsons, S. G., Pelisoli, I., Sahman, D. I., Wild, J. F., van Kerkwijk, M. H., Stappers, B. W.

We present simultaneous, multi-colour optical light curves of the companion star to the black-widow pulsar PSR J2051-0827, obtained approximately 10 years apart using ULTRACAM and HiPERCAM, respectively. The ULTRACAM light curves confirm the previous

Externí odkaz: http://arxiv.org/abs/2208.09249

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Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii

Autor: Pelisoli, Ingrid, Marsh, T. R., Parsons, S. G., Aungwerojwit, A., Ashley, R. P., Breedt, E., Brown, A. J., Dhillon, V. S., Dyer, M. J., Green, M. J., Kerry, P., Littlefair, S. P., Sahman, D. I., Shahbaz, T., Wild, J. F., Chakpor, A., Lakhom, R.

AR Scorpii (AR Sco) is the only radio-pulsing white dwarf known to date. It shows a broad-band spectrum extending from radio to X-rays whose luminosity cannot be explained by thermal emission from the system components alone, and is instead explained

Externí odkaz: http://arxiv.org/abs/2208.08450

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Optical detection of the rapidly spinning white dwarf in V1460 Her

Autor: Pelisoli, Ingrid, Marsh, T. R., Ashley, R. P., Hakala, Pasi, Aungwerojwit, A., Burdge, K., Breedt, E., Brown, A. J., Chanthorn, K., Dhillon, V. S., Dyer, M. J., Green, M. J., Kerry, P., Littlefair, S. P., Parsons, S. G., Sahman, D. I., Wild, J. F., Yotthanathong, S.

Accreting magnetic white dwarfs offer an opportunity to understand the interplay between spin-up and spin-down torques in binary systems. Monitoring of the white dwarf spin may reveal whether the white dwarf spin is currently in a state of near-equil

Externí odkaz: http://arxiv.org/abs/2109.00553

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Found: a rapidly spinning white dwarf in LAMOST J024048.51+195226.9

Autor: Pelisoli, Ingrid, Marsh, T. R., Dhillon, V. S., Breedt, E., Brown, A. J., Dyer, M. J., Green, M. J., Kerry, P., Littlefair, S. P., Parsons, S. G., Sahman, D. I., Wild, J. F.

We present optical photometry of the cataclysmic variable LAMOST J024048.51+195226.9 taken with the high-speed, five-band CCD camera HiPERCAM on the 10.4 m Gran Telescopio Canarias (GTC). We detect pulsations originating from the spin of its white dw

Externí odkaz: http://arxiv.org/abs/2108.11396

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System parameters of three short period cataclysmic variable stars

Autor: Wild, J. F., Littlefair, S. P., Ashley, R. P., Breedt, E., Brown, A., Dhillon, V. S., Dyer, M. J., Green, M. J., Kerry, P., Marsh, T. R., Parsons, S. G., Sahman, D. I.

Using photometric ULTRACAM observations of three new short period cataclysmic variables, we model the primary eclipse lightcurves to extract the orbital separation, masses, and radii of their component stars. We find donor masses of 0.060 +/- 0.008 s

Externí odkaz: http://arxiv.org/abs/2107.07400

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