Zobrazeno 1 - 10
of 148
pro vyhledávání: '"Wickramasinghe, Dayal"'
We present the observational mass-radius (M-R) relation for a sample of 47 magnetized white dwarfs (WDs) with the magnetic field strength (B) ranging from 1 to 773 MG, identified from the SDSS data release 7 (DR7). We derive their effective temperatu
Externí odkaz:
http://arxiv.org/abs/2403.13888
Autor:
Caiazzo, Ilaria, Burdge, Kevin B., Tremblay, Pier-Emmanuel, Fuller, James, Ferrario, Lilia, Gaensicke, Boris T., Hermes, J. J., Heyl, Jeremy, Kawka, Adela, Kulkarni, S. R., Marsh, Thomas R., Mroz, Przemek, Prince, Thomas A., Richer, Harvey B., Rodriguez, Antonio C., van Roestel, Jan, Vanderbosch, Zachary P., Vennes, Stephane, Wickramasinghe, Dayal, Dhillon, Vikram S., Littlefair, Stuart P., Munday, James, Pelisoli, Ingrid, Perley, Daniel, Bellm, Eric C., Breedt, Elme, Brown, Alex J., Dekany, Richard, Drake, Andrew, Dyer, Martin J., Graham, Matthew J., Green, Matthew J., Laher, Russ R., Kerry, Paul, Parsons, Steven G., Riddle, Reed L., Rusholme, Ben, Sahman, Dave I.
Publikováno v:
Nature 620, 61-66 (2023)
White dwarfs, the extremely dense remnants left behind by most stars after their death, are characterised by a mass comparable to that of the Sun compressed into the size of an Earth-like planet. In the resulting strong gravity, heavy elements sink t
Externí odkaz:
http://arxiv.org/abs/2308.07430
The origin of magnetic fields in isolated and binary white dwarfs has been investigated in a series of recent papers. One proposal is that magnetic fields are generated through an alpha-omega dynamo during common envelope evolution. Here we present p
Externí odkaz:
http://arxiv.org/abs/1810.06148
In a series of recent papers, it has been proposed that high field magnetic white dwarfs are the result of close binary interaction and merging. Population synthesis calculations have shown that the origin of isolated highly magnetic white dwarfs is
Externí odkaz:
http://arxiv.org/abs/1809.08741
Autor:
Wickramasinghe, N. C., Wickramasinghe, Dayal T., Tout, Christopher A., Lattanzio, John C., Steele, Edward J.
A series of astronomical observations obtained over the period 1986 to 2018 supports the idea that life is a cosmic rather than a purely terrestrial or planetary phenomenon. These include (1) the detection of biologically relevant molecules in inters
Externí odkaz:
http://arxiv.org/abs/1805.10126
A dynamo mechanism driven by differential rotation when stars merge has been proposed to explain the presence of strong fields in certain classes of magnetic stars. In the case of the high field magnetic white dwarfs (HFMWDs), the site of the differe
Externí odkaz:
http://arxiv.org/abs/1804.09910
Publikováno v:
2017 MNRAS 464, 237
The most frequently seen binary companions to millisecond pulsars (MSPs) are helium white dwarfs (He WDs). The standard rejuvenation mechanism, in which a low- to intermediate-mass companion to a neutron star fills its Roche lobe between central hydr
Externí odkaz:
http://arxiv.org/abs/1709.08289
A fast spinning magnetic white dwarf in the double-degenerate, super-Chandrasekhar system NLTT 12758
Autor:
Kawka, Adela, Briggs, Gordon P., Vennes, Stephane, Ferrario, Lilia, Paunzen, Ernst, Wickramasinghe, Dayal T.
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. We measured an orbital period of 1.154 days and found that the mag
Externí odkaz:
http://arxiv.org/abs/1612.00325
We report results from a continuation of our searches for high field magnetic white dwarfs paired in a detached binary with non degenerate companions. We made use of the Sloan Digital Sky Survey DR7 catalog of Kleinman et al. (2013) with 19,712 spect
Externí odkaz:
http://arxiv.org/abs/1504.08063
Autor:
Briggs, Gordon P., Ferrario, Lilia, Tout, Christopher A., Wickramasinghe, Dayal T., Hurley, Jarrod R.
A magnetic dynamo driven by differential rotation generated when stars merge can explain strong fields in certain classes of magnetic stars, including the high field magnetic white dwarfs (HFMWDs). In their case the site of the differential rotation
Externí odkaz:
http://arxiv.org/abs/1412.5662