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

Chen, Lei and Moór, Attila and Kreplin, Alexander and Kóspál, Ágnes and Ábrahám, Péter (2019) Variable Warm Dust around the Herbig Ae Star HD 169142: Birth of a Ring? ASTROPHYSICAL JOURNAL LETTERS, 887 (2). ISSN 2041-8205

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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 dus component in the sub-astronomical-unit region. Following up on ou previous analysis, we further studied the temporal evolution of inne dust around HD 169142, which may provide information on the evolutio infrared interferometric observations obtained with the Very Larg Telescope Interferometer/PIONIER to constrain the dust distribution a three epochs spanning six years. We also studied the photometri variability of HD 169142 using our optical─infrared observations an archival data. Our results indicate that a dust ring at ∼0.3 au forme some time between 2013 and 2018, and then faded (but did not completel disappear) by 2019. The short-term variability resembles that observe in extreme debris disks, and is likely related to short-lived dust o secondary origin, though variable shadowing from the inner ring could b an alternative interpretation. If confirmed, this is the first direc detection of secondary dust production inside a protoplanetary disk. Based on observations collected at the European Organisation fo Astronomical Research in the Southern Hemisphere under ESO program 0101.C-0367 and 60.A-9135

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