An Eccentric Binary with a Misaligned Circumbinary Disk
Zhecheng Hu, Wei Zhu, Fei Dai, Ping Chen, Yang Huang, Min Fang,, Richard S. Post

TL;DR
This study confirms Bernhard-2 as an eccentric binary with a misaligned circumbinary disk, revealing ongoing disk precession and pulsed accretion, offering insights into disk physics and evolution.
Contribution
First detailed characterization of Bernhard-2 as an eccentric binary with a misaligned, precessing circumbinary disk, linking it to similar systems like KH 15D.
Findings
Binary eccentricity e=0.69 ± 0.08
Masses of binary components ~1.1 and 0.9 solar masses
Evidence of disk precession and pulsed accretion
Abstract
We present spectroscopic and photometric observations of Bernhard-2, which was previously identified as a candidate system to host a misaligned circumbinary disk. Our spectroscopic measurements confirm that Bernhard-2 indeed contains an eccentric () binary and thus that the periodic variability in the photometric light curve is best explained by the occultation by the misaligned circumbinary disk. By modeling the spectral energy distributions at different phases, we infer the masses of the two binary components to be and , respectively. The system age is determined to be 20 Myr by combining the stellar isochrone model with lithium abundance. Our new photometric observations show clear deviations from the model prediction based on the archival data, suggesting ongoing precession of the circumbinary disk. The H…
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Taxonomy
TopicsMaterial Science and Thermodynamics · Holomorphic and Operator Theory · Silicone and Siloxane Chemistry
