2021
DOI: 10.48550/arxiv.2104.07033
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LAMOST J0140355+392651: An evolved cataclysmic variable donor transitioning to become an extremely low mass white dwarf

Kareem El-Badry,
Eliot Quataert,
Hans-Walter Rix
et al.

Abstract: We present LAMOST J0140355+392651 (hereafter J0140), a close (𝑃 orb = 3.81 hours) binary containing a bloated, low-mass (𝑀 β‰ˆ 0.15𝑀 ) proto-white dwarf (WD) and a massive (𝑀 β‰ˆ 0.95 𝑀 ) WD companion. The system's optical light curve is dominated by large-amplitude ellipsoidal variability but also exhibits additional scatter, likely driven by pulsations. The proto-WD is cooler (𝑇 eff = 6800 Β± 100 K) and more puffy (log 𝑔/ cm s βˆ’2 = 4.74 Β± 0.07) than any known extremely low mass (ELM) WD, but hotter than an… Show more

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