Search Results - "white dwarf"

Observing and modelling magnetic fields in white dwarfs by Vennes, S., Kawka, Adela, Ferrario, L., Paunzen, E.

“…Our ongoing spectroscopic survey of high proper motion stars is a rich source of new magnetic white dwarfs. We present a few examples among cool white dwarfs showing the effect of field strength and geometry on the observed optical spectrum. …”
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The properties and origin of magnetic fields in white dwarfs by Kawka, Adela

“…A significant fraction of white dwarfs harbour a magnetic field with strengths ranging from a few kG up to about 1000 MG. …”
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Magnetic fields in isolated and interacting white dwarfs by Ferrario, L., Wickramasinghe, D., Kawka, Adela

“…The magnetic white dwarfs (MWDs) are found either isolated or in interacting binaries. …”
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The closest extremely low-mass white dwarf to the Sun by Kawka, Adela, Simpson, Jeffrey D, Vennes, Stephane, Bessell, Michael S, Da Costa, Gary S, Marino, Anna F, Murphy, Simon J

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Evidence of enhanced magnetism in cool, polluted white dwarfs by Kawka, Adela, Vennes, S., Ferrario, L., Paunzen, E.

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The polluted atmospheres of cool white dwarfs and the magnetic field connection by Kawka, Adéla, Vennes, S.

“…We present an analysis of X-Shooter spectra of the polluted hydrogen-rich white dwarfs (DAZ) NLTT 888 and NLTT 53908. The spectra of NLTT 53908 show strong, Zeeman-split calcium lines (Ca II H&K and Ca I?…”
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Extreme abundance ratios in the polluted atmosphere of the cool white dwarf NLTT 19868 by Kawka, Adela, Vennes, S.

“…We present an analysis of intermediate-dispersion spectra and photometric data of the newly identified cool, polluted white dwarf NLTT 19868. The spectra obtained with X-shooter on the Very Large Telescope-Melipal show strong lines of calcium, and several lines of magnesium, aluminium and iron. …”
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A luminous Be+ white dwarf supersoft source in the wing of the SMC: MAXI J0158-744 by Li, K., Kong, A., Charles, P., Lu, T., Bartlett, E., Coe, M., McBride, V., Rajoelimanana, A., Udalski, A., Masetti, N., Franzen, Thomas

“…The brief hard X-ray flash could possibly be a result of the interaction of the ejected nova shell with the B star wind in which the white dwarf (WD) is embedded. This makes MAXI J0158-744 only the third Be/WD system in the Magellanic Clouds, but it is by far the most luminous. …”
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An unusual white dwarf star may be a surviving remnant of a subluminous Type Ia supernova by Vennes, S., Nemeth, P., Kawka, Adela, Thorstensen, J., Khalack, V., Ferrario, L., Alper, E.

“…Subluminous Type Ia supernovae, such as the Type Iax–class prototype SN 2002cx, are described by a variety of models such as the failed detonation and partial deflagration of an accreting carbon-oxygen white dwarf star or the explosion of an accreting, hybrid carbon-oxygen-neon core. …”
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A fast spinning magnetic white dwarf in the double degenerate, super-Chandrasekhar system NLTT 12758 by Kawka, Adéla, Briggs, G., Vennes, S., Ferrario, L., Paunzen, E., Wickramasinghe, D.

“…We present an analysis of the close double degenerate NLTT 12758, which is comprised of a magnetic white dwarf with a field of about 3.1 MG and an apparently non-magnetic white dwarf. …”
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Long-period Radio Pulsars: Population Study in the Neutron Star and White Dwarf Rotating Dipole Scenarios by Rea, N., Hurley-Walker, Natasha, Pardo-Araujo, C., Ronchi, M., Graber, V., Coti Zelati, F., de Martino, D., Bahramian, Arash, McSweeney, Sam, Galvin, Tim, Hyman, S.D., Dall’Ora, M.

“…In contrast, long rotational periods are common in white dwarfs (WDs) but, although predicted, dipolar radio emission from isolated magnetic WDs has never been unambiguously observed. …”
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The High Time Resolution Universe survey - XI. Discovery of five recycled pulsars and the optical detectability of survey white dwarf companions by Bates, S., Thornton, D., Bailes, M., Barr, E., Bassa, C., Bhat, Ramesh, Burgay, M., Burke-Spolaor, S., Champion, D., Flynn, C., Jameson, A., Johnston, S., Keith, M., Kramer, M., Levin, L., Lyne, A., Milia, S., Ng, C., Petroff, E., Possenti, A., Stappers, B., van Straten, W., Tiburzi, C.

“…The circular orbit suggests that the companion is not another neutron star, so future timing experiments may reveal one of the heaviest white dwarfs ever found (>1.3 M☉). Timing observations of PSR J1431-4715 indicate that it is eclipsed by its companion which has a mass indicating it belongs to the redback class of eclipsing millisecond pulsars. …”
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Extraordinary luminous soft x-ray transient maxi j0158-744 as an ignition of a nova on a very massive o-ne white dwarf by Morii, M., Tomida, H., Kimura, M., Suwa, F., Negoro, H., Serino, M., Kennea, J., Curran, Peter, Walter, F., Kuin, N., Pritchard, T., Nakahira, S., Hiroi, K., Usui, R., Kawai, N., Osborne, J., Mihara, T., Sugizaki, M., Gehrels, N., Kohama, M., Kotani, T., Matsuoka, M., Nakajima, M., Roming, P., Sakamoto, T., Sugimori, K., Tsuboi, Y., Tsunemi, H., Ueda, Y., Ueno, S., Yoshida, A.

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A MeerKAT survey of nearby nova-like cataclysmic variables by Hewitt, D.M., Pretorius, M.L., Woudt, P.A., Tremou, E., Miller-Jones, James, Knigge, C., Castro Segura, N., Williams, D.R.A., Fender, R.P., Armstrong, R., Groot, P., Heywood, I., Horesh, A., Van Der Horst, A.J., Koerding, E., McBride, V.A., Mooley, K.P., Rowlinson, A., Stappers, B., Wijers, R.A.M.J.

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A deep search for faint Chandra X-ray sources, radio sources, and optical counterparts in NGC 6752 by Cohn, H.N., Lugger, P.M., Zhao, Y., Tudor, V., Heinke, C.O., Cool, A.M., Anderson, J., Strader, J., Miller-Jones, James

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The ultracompact nature of the black hole candidate X-ray binary 47 Tuc X9 by Bahramian, A., Heinke, C., Tudor, Vlad, Miller-Jones, James, Bogdanov, S., Maccarone, T., Knigge, C., Sivakoff, G., Chomiuk, L., Strader, J., Garcia, J., Kallman, T.

“…However, Miller-Jones et al. recently identified a radio counterpart to X9 (inferring a radio/X-ray luminosity ratio consistent with black hole LMXBs), and suggested that the donor star might be a white dwarf. We report simultaneous observations of X9 performed by Chandra, NuSTAR and Australia Telescope Compact Array. …”
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Strong field tests of gravity with PSR J1141-6545 by Krishnan, V., Van Straten, W., Rosado, P., Bailes, M., Keane, E., Bhat, Ramesh, Flynn, C.

“…The initial results from timing observations of PSR J1141-6545, a relativistic pulsar-white dwarf binary system, are presented. Predictions from the timing baseline hint at the most stringent test of gravity by an asymmetric binary yet. …”
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PSR J1141-6545: A powerful laboratory of GR and tensor-scalar theories of gravity by Verbiest, J., Bhat, Ramesh, Bailes, M.

“…Pulsars in close binary systems have provided some of the most stringent tests of strong- field gravity to date. The pulsar{white-dwarf binary system J11416545 is specifically interesting due to its gravitational asymmetry, which makes it one of the most powerful probes of tensor-scalar theories of gravity. …”
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Transformation of a star into a planet in a millisecond pulsar binary by Bailes, M., Bates, S., Bhalerao, V., Bhat, Ramesh, Burgay, M., Burke-Spolaor, S., D'Amico, N., Johnston, S., Keith, M., Kramer, M., Kulkarni, S., Levin, L., Lyne, A., Milia, S., Possenti, A., Spitler, L., Stappers, B., Van Straten, W.

“…The mass of its companion is near that of Jupiter, but its minimum density of 23 grams per cubic centimeter suggests that it may be an ultralow-mass carbon white dwarf. This system may thus have once been an ultracompact low-mass x-ray binary, where the companion narrowly avoided complete destruction.…”
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The discovery of 5 millisecond pulsars in the high time resolution universe survey by Bates, S., Bailes, M., Bhat, Ramesh, Burgay, M., Burke-Spolaor, S., D'Amico, N., Jameson, A., Johnston, S., Keith, M., Kramer, M., Levin, L., Lyne, A., Milia, S., Possenti, A., Stappers, B., Van Straten, W.

“…In four of these systems, the most likely companion is a white dwarf, with minimum masses of ~0.2M ? . The other pulsar, J1731-1847, has a very low mass companion and exhibits eclipses, and is thus a member of the "black widow" class of pulsar binaries. …”
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