2024
DOI: 10.3847/1538-4357/ad3e86
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Discovery of a Proto–White Dwarf with a Massive Unseen Companion

Gautham Adamane Pallathadka,
Vedant Chandra,
Nadia L. Zakamska
et al.

Abstract: We report the discovery of SDSS J022932.28+713002.7, a nascent extremely low-mass (ELM) white dwarf (WD) orbiting a massive (>1 M ⊙ at 2σ confidence) companion with a period of 36 hr. We use a combination of spectroscopy, including data from the ongoing fifth-generation Sloan Digital Sky Survey (SDSS-V), and photometry to measure the stellar parameters of the primary pre-ELM WD. The lightcurve of the primary WD exhibits ellipsoidal variation, which we combine with radial velocity data and … Show more

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