| DOI | Resolve DOI: https://doi.org/10.1093/mnras/stz2770 |
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| Author | Search for: Calcino, Josh; Search for: Price, Daniel jORCID identifier: https://orcid.org/0000-0002-4716-4235; Search for: Pinte, ChristopheORCID identifier: https://orcid.org/0000-0001-5907-5179; Search for: Van Der Marel, Nienke1; Search for: Ragusa, EnricoORCID identifier: https://orcid.org/0000-0001-5378-7749; Search for: Dipierro, GiovanniORCID identifier: https://orcid.org/0000-0002-7185-5458; Search for: Cuello, Nicolás; Search for: Christiaens, Valentin |
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| Affiliation | - National Research Council of Canada. Aerospace
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| Format | Text, Article |
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| Subject | hydrodynamics; methods: numerical; protoplanetary discs; circumstellar matter; stars: individual: Oph IRS 48 |
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| Abstract | We test the hypothesis that the disc cavity in the ‘transition disc’ Oph IRS 48 is carved by an unseen binary companion. We use 3D dust–gas smoothed-particle hydrodynamics simulations to demonstrate that marginally coupled dust grains concentrate in the gas overdensity that forms in the cavity around a low binary mass ratio binary. This produces high contrast ratio dust asymmetries at the cavity edge similar to those observed in the disc around IRS 48 and other transition discs. This structure was previously assumed to be a vortex. However, we show that the observed velocity map of IRS 48 displays a peculiar asymmetry that is not predicted by the vortex hypothesis. We show the unusual kinematics are naturally explained by the non-Keplerian flow of gas in an eccentric circumbinary cavity. We further show that perturbations observed in the isovelocity curves of IRS 48 may be explained as the product of the dynamical interaction between the companion and the disc. The presence of an ∼0.4 M⊙ companion at an ∼10 au separation can qualitatively explain these observations. High spatial resolution line and continuum imaging should be able to confirm this hypothesis. |
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| Publication date | 2019-10-09 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 6f0b1e83-0619-4686-af82-ca35958f4fab |
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| Record created | 2021-08-24 |
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| Record modified | 2021-08-24 |
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