Probing white dwarf interiors with LISA: periastron precession in double white dwarfs
B. Willems (1), A. Vecchio (1,2), V. Kalogera (1) ((1) Northwestern, U., (2) U. of Birmingham)
TL;DR
This paper investigates how LISA can detect periastron precession in eccentric double white dwarf systems, considering tidal, rotational, and relativistic effects, to probe white dwarf interiors.
Contribution
It introduces the analysis of tidal and rotational effects on periastron precession detection with LISA, expanding beyond previous relativistic-only models.
Findings
Tides and stellar rotation dominate precession at frequencies above a few mHz.
Detection of precession can provide insights into white dwarf interior structure.
LISA can potentially observe these effects in globular cluster white dwarf populations.
Abstract
In globular clusters, dynamical interactions give rise to a population of eccentric double white dwarfs detectable by the Laser Interferometer Space Antenna (LISA) up to the Large Magellanic Cloud. In this Letter, we explore the detectability of periastron precession in these systems with LISA. Unlike previous investigations, we consider contributions due to tidal and rotational distortions of the binary components in addition to general relativistic contributions to the periastron precession. At orbital frequencies above a few mHz, we find that tides and stellar rotation dominate, opening up a possibly unique window to the study of the interior and structure of white dwarfs.
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