Two candidate KH 15D-like systems from the Zwicky Transient Facility. (2022)
Keywords :
Circumstellar disks ; Variable stars
Abstract:KH 15D contains a circumbinary disk that is tilted relative to the orbital plane of the central binary. The precession of the disk and the orbital motion of the binary together produce rich phenomena in the photometric light curve. In this work, we present the discovery and preliminary analysis of two objects that resemble the key features of KH 15D from the Zwicky Transient Facility. These new objects, Bernhard-1 and Bernhard-2, show large-amplitude ( >1.5 mag), long-duration (more than tens of days), and periodic dimming events. A one-sided screen model is developed to model the photometric behavior of these objects, the physical interpretation of which is a tilted, warped circumbinary disk occulting the inner binary. Changes in the
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We attempted to obtain follow-up, high-cadence photometric
observations of Bernhard-2 when it was visible from the ground. A few
nights of observations were obtained from the 32inch telescope at the
Post Observatory, the 16inch telescope at the Remote Observatory
Atacama Desert Hambsch (2012JAVSO..40.1003H, ROAD), and the 1m
telescopes of the Las Cumbres Observatory Global Telescope Brown+
(2013PASP..125.1031B, LCOGT) in 2021 December, when the system was
exiting the egress. In early 2022, more systematic observations were
obtained on the 1m LCOGT telescopes and captured a broader range of
the egress region.
We observed Bernhard-2 with the High Resolution Echelle Spectrometer
on the 10m Keck I telescope (Keck/HIRES) at UT 07:42 on 2022 January
8, when the object was outside the occultation (section 3.3).
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