Wolf 1130: A Nearby Triple System Containing a Cool, Ultramassive White Dwarf
Gregory N. Mace, Andrew W. Mann, Brian A. Skiff, Christopher Sneden,, Davy Kirkpatrick, Adam C. Schneider, Benjamin Kidder, Natalie M. Gosnell,, Hwihyun Kim, Brian W. Mulligan, L. Prato, Daniel Jaffe

TL;DR
This paper characterizes Wolf 1130 as a nearby triple system with an ultramassive, cool white dwarf, revealing its orbital dynamics, component masses, and evolutionary history, and highlighting its potential as a Type Ia supernova progenitor.
Contribution
It provides the first detailed analysis of Wolf 1130's components, orbital parameters, and evolutionary implications, including the discovery of an ultramassive white dwarf in a triple system.
Findings
Wolf 1130's components are tidally locked.
The primary is an ultramassive, cool white dwarf.
The system is a potential Type Ia supernova progenitor.
Abstract
Following the discovery of the T8 subdwarf WISEJ200520.38+542433.9 (Wolf 1130C), with common proper motion to a binary (Wolf 1130AB) consisting of an M subdwarf and a white dwarf, we set out to learn more about the old binary in the system. We find that the A and B components of Wolf 1130 are tidally locked, which is revealed by the coherence of more than a year of V band photometry phase folded to the derived orbital period of 0.4967 days. Forty new high-resolution, near-infrared spectra obtained with the Immersion Grating Infrared Spectrometer (IGRINS) provide radial velocities and a projected rotational velocity (v sin i) of 14.7 +/- 0.7 km/s for the M subdwarf. In tandem with a Gaia parallax-derived radius and verified tidal-locking, we calculate an inclination of i=29 +/- 2 degrees. From the single-lined orbital solution and the inclination we derive an absolute mass for the unseen…
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