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Variable Warm Dust around the Herbig Ae Star HD 169142: Birth of a Ring?

Abstract : The Herbig Ae star HD 169142 is known to have a gaseous disk with a large inner hole, and also a photometrically variable inner dust component in the sub-astronomical-unit region. Following up on our previous analysis, we further studied the temporal evolution of inner dust around HD 169142, which may provide information on the evolution from late-stage protoplanetary disks to debris disks. We used near-infrared interferometric observations obtained with the Very Large Telescope Interferometer/PIONIER to constrain the dust distribution at three epochs spanning six years. We also studied the photometric variability of HD 169142 using our optical-infrared observations and archival data. Our results indicate that a dust ring at ∼0.3 au formed some time between 2013 and 2018, and then faded (but did not completely disappear) by 2019. The short-term variability resembles that observed in extreme debris disks, and is likely related to short-lived dust of secondary origin, though variable shadowing from the inner ring could be an alternative interpretation. If confirmed, this is the first direct detection of secondary dust production inside a protoplanetary disk.

Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programs 0101.C-0367 and 60.A-9135.

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Submitted on : Friday, May 20, 2022 - 3:25:18 PM
Last modification on : Saturday, June 25, 2022 - 3:06:30 AM

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Lei Chen, Attila Moór, Alexander Kreplin, Ágnes Kóspál, Peter Ábrahám, et al.. Variable Warm Dust around the Herbig Ae Star HD 169142: Birth of a Ring?. The Astrophysical Journal Letters, 2019, 887, ⟨10.3847/2041-8213/ab59dd⟩. ⟨insu-03674381⟩

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