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pro vyhledávání: '"Walters N"'
This letter reports the first detection of a periodic light curve whose modulation is unambiguously due to rotation in a polluted white dwarf. TESS observations of WD 2138-332, at a distance of 16.1 pc, reveal a 0.39 per cent amplitude modulation wit
Externí odkaz:
http://arxiv.org/abs/2312.03845
This paper reports the ULTRACAM discovery of dipolar surface spots in two cool magnetic white dwarfs with Balmer emission lines, while a third system exhibits a single spot, similar to the prototype GD 356. The light curves are modeled with simple, c
Externí odkaz:
http://arxiv.org/abs/2307.02543
White dwarfs stars are known to be polluted by their active planetary systems, but little attention has been paid to the accretion of wind from low-mass companions. The capture of stellar or substellar wind by white dwarfs is one of few methods avail
Externí odkaz:
http://arxiv.org/abs/2306.11806
Autor:
Robert F Kelly, Saidou M Hamman, Kenton L Morgan, Egbe F Nkongho, Victor Ngu Ngwa, Vincent Tanya, Walters N Andu, Melissa Sander, Lucy Ndip, Ian G Handel, Stella Mazeri, Adrian Muwonge, Barend M de C Bronsvoort
Publikováno v:
PLoS ONE, Vol 11, Iss 1, p e0146538 (2016)
BackgroundControl of bovine tuberculosis (bTB) and zoonotic tuberculosis (zTB) has relied upon surveillance and slaughter of infected cattle, milk pasteurisation and public health education. In Cameroon, like many other sub-Saharan African countries,
Externí odkaz:
https://doaj.org/article/8ecd8c31a71f4b32ad6e7b8034e53f7d
Autor:
Walters, N., Farihi, J., Marsh, T. R., Breedt, E., Cauley, P. W., von Hippel, T., Hermes, J. J.
This study presents observations of two possible substellar survivors of post-main sequence engulfment, currently orbiting white dwarf stars. Infrared and optical spectroscopy of GD 1400 reveal a 9.98 h orbital period, where the benchmark brown dwarf
Externí odkaz:
http://arxiv.org/abs/2207.07022
Autor:
Whitehouse, L. J., Farihi, J., Howarth, I. D., Mancino, S., Walters, N., Swan, A., Wilson, T. G., Guo, J.
Many characteristics of dwarf carbon stars are broadly consistent with a binary origin, including mass transfer from an evolved companion. While the population overall appears to have old-disc or halo kinematics, roughly 2$\,$per cent of these stars
Externí odkaz:
http://arxiv.org/abs/2105.00036
Autor:
Walters, N., Farihi, J., Marsh, T. R., Bagnulo, S., Landstreet, J. D., Hermes, J. J., Achilleos, N., Wallach, A., Hart, M., Manser, C. J.
Despite thousands of spectroscopic detections, only four isolated white dwarfs exhibit Balmer emission lines. The temperature inversion mechanism is a puzzle over 30 years old that has defied conventional explanations. One hypothesis is a unipolar in
Externí odkaz:
http://arxiv.org/abs/2103.01993
Akademický článek
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Publikováno v:
Monthly Notices of the Royal Astronomical Society; 10/15/2023, Vol. 525 Issue 1, p1097-1105, 9p
Publikováno v:
Monthly Notices of the Royal Astronomical Society; Oct2023, Vol. 524 Issue 4, p5096-5108, 13p