Signatures of an eccentric disc cavity: Dust and gas in IRS 48

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dc.contributor.authorCalcino, Josh
dc.contributor.authorPrice, Daniel J.
dc.contributor.authorPinte, Christophe
dc.contributor.authorvan der Marel, Nienke
dc.contributor.authorRagusa, Enrico
dc.contributor.authorDipierro, Giovanni
dc.contributor.authorCuello, Nicolas
dc.contributor.authorChristiaens, Valentin
dc.date.accessioned2025-01-23T21:09:24Z
dc.date.available2025-01-23T21:09:24Z
dc.date.issued2019
dc.description.abstractWe 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 similar to 0.4 M-circle dot companion at an similar to 10 au separation can qualitatively explain these observations. High spatial resolution line and continuum imaging should be able to confirm this hypothesis.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stz2770
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stz2770
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100814
dc.identifier.wosidWOS:000496926900082
dc.issue.numero2
dc.language.isoen
dc.pagina.final2587
dc.pagina.inicio2579
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjecthydrodynamics
dc.subjectmethods: numerical
dc.subjectprotoplanetary discs
dc.subjectcircumstellar matter
dc.subjectstars: individual: Oph IRS 48
dc.titleSignatures of an eccentric disc cavity: Dust and gas in IRS 48
dc.typeartículo
dc.volumen490
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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