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The closest extremely low-mass white dwarf to the Sun

Kawka, Adela; Simpson, Jeffrey D; Vennes, Stephane; Bessell, Mike; Da Costa, Gary; Marino, A F; Murphy, Simon J.


We present the orbit and properties of 2MASS J050051.85−093054.9, establishing it as the closest (d ≈ 71 pc) extremely low-mass white dwarf to the Sun. We find that this star is hydrogen rich with Teff ≈ 10 500 K, log g ≈ 5.9, and, following evolutionary models, has a mass of ≈0.17 M. Independent analysis of radial velocity and Transiting Exoplanet Survey Satellite (TESS) photometric time series reveals an orbital period of ≈9.5 h. Its high velocity amplitude (K ≈ 144 km s−1) produces a...[Show more]

CollectionsANU Research Publications
Date published: 2020
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnrasl/slaa068
Access Rights: Open Access


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