Double-peaked OI profile: a likely signature of the gaseous ring around KH 15D

Abstract

KH 15D is a well-known spectroscopic binary because of its unique and dramatic photometric variability. The variability is explained by a circumbinary dust ring but the ring itself was never directly detected. We present a new interpretation of the double-peaked [O~{\scriptsize I}]\,$\lambda$6300 profiles as originating from the hot disk surface of KH 15D. By modeling these profiles, we measure emitting radii between $\sim$0.5--5 au, basically a gaseous ring very similar in radial extent to the dust ring inferred from modeling the system's photometric variability. We also discuss the possibility that external photoevaporation driven by UV photons from the nearby massive star HD~47887 has truncated the outer edge of the disk to the observed value.

8 pages, 5 figures, accepted by ApJL

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Cited by in corpus (7)

• Efficient Dust Ring Formation in Misaligned Circumbinary Discs
• Constraining the Circumbinary Disk Tilt in the KH 15D system
• Dust Traffic Jams in Inclined Circumbinary Protoplanetary Discs I. Morphology and Formation Theory
• Dynamical dust traps in misaligned circumbinary discs: analytical theory and numerical simulations
• Two Candidate KH 15D-like Systems from the Zwicky Transient Facility
• Misaligned circumbinary disks as efficient progenitors of interstellar asteroids
• Misalignment of terrestrial circumbinary planets as an indicator of their formation mechanism