The nature of the companion of PSR J1719-1438: a white dwarf or an exotic object?

TL;DR

This paper explores whether the companion of PSR J1719-1438 is an exotic quark object instead of a white dwarf, proposing that the exotic hypothesis better explains observed features and makes testable predictions.

Contribution

It introduces the possibility that the companion is an exotic quark object, offering a novel explanation for the system's observed characteristics.

Findings

Exotic quark object hypothesis explains observed features.

Predicts specific observable signatures for future testing.

Challenges the white dwarf companion assumption.

Abstract

We rise in this Letter the possibility that the very dense, compact companion of PSR J1719-1438, having a Jupiter-like mass is an exotic quark object rather than a light helium or carbon white dwarf. The exotic hypothesis explains naturally some of the observed features, and gives quite strong predictions for this system, to be confirmed or refuted in future feasible studies.