Dynamical determination of the quadrupole mass moment of a white dwarf

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dc.creatorIorio, Lorenzo
dc.date2006-11-23
dc.date2007-03-19
dc.date.accessioned2026-07-07T11:01:27Z
dc.date.available2026-07-07T11:01:27Z
dc.descriptionIn this letter we dynamically determine the quadrupole mass moment Q of the magnetic white dwarf WD 0137-349 by analyzing the period of the recently discovered brown dwarf moving around it in a close 2-hr orbit. It turns out that a purely Newtonian model for the orbit of WD 0137-349B, assumed circular and equatorial, is adequate, given the present-day accuracy in knowing the orbital parameters of such a binary system. Our result is Q=(-1.4615 +/- 0.9004) 10^47 kg m^2 for i=35 deg. It is able to accommodate the 3-sigma significant discrepancy of (1.0 +/- 0.3) 10^-8 s^-2 between the inverse square of the phenomenologically determined orbital period and the inverse square of the calculated Keplerian one. The impact of i, for which a range Delta i of possible values close to 35 deg is considered, is investigated as well.
dc.descriptionLaTex2e, 8 pages, no figures, 1 table, 23 references. Discussion on the impact of the inclination added. Thanks to J. Katz. More details on the significant 3-sigma discrepancy between the Keplerian and the phenomenologically measured period added. Two references added. Final version to appear in Astrophysics and Space Science, including the proofs corrections
dc.identifierhttps://arxiv.org/abs/gr-qc/0611126
dc.identifierhttp://arxiv.org/abs/gr-qc/0611126
dc.identifierAstrophys.SpaceSci.310:73-76,2007
dc.identifierdoi:10.1007/s10509-007-9415-x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187953
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectNuclear Theory
dc.subjectSpace Physics
dc.titleDynamical determination of the quadrupole mass moment of a white dwarf
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