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Probing the Inner Disk Emission of the Herbig Ae Stars HD 163296 and HD 190073

https://doi.org/10.3847/1538-4357/aaef2c

Setterholm, Benjamin R. ; Monnier, John D. ; Davies, Claire L. ; Kreplin, Alexander ; Kraus, Stefan ; Baron, Fabien ; Aarnio, Alicia ; Berger, Jean-Philippe ; Calvet, Nuria ; Curé, Michel ; et al ( December 2018 , The Astrophysical Journal)

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A triple-star system with a misaligned and warped circumstellar disk shaped by disk tearing

https://doi.org/10.1126/science.aba4633

Kraus, Stefan ; Kreplin, Alexander ; Young, Alison K. ; Bate, Matthew R. ; Monnier, John D. ; Harries, Tim J. ; Avenhaus, Henning ; Kluska, Jacques ; Laws, Anna S. E. ; Rich, Evan A. ; et al ( September 2020 , Science)

Young stars are surrounded by a circumstellar disk of gas and dust, within which planet formation can occur. Gravitational forces in multiple star systems can disrupt the disk. Theoretical models predict that if the disk is misaligned with the orbital plane of the stars, the disk should warp and break into precessing rings, a phenomenon known as disk tearing. We present observations of the triple-star system GW Orionis, finding evidence for disk tearing. Our images show an eccentric ring that is misaligned with the orbital planes and the outer disk. The ring casts shadows on a strongly warped intermediate region of the disk. If planets can form within the warped disk, disk tearing could provide a mechanism for forming wide-separation planets on oblique orbits.

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