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dc.contributor.authorForgan, Duncan H.
dc.contributor.authorIlee, John D.
dc.contributor.authorMeru, Farzana
dc.identifier.citationForgan , D H , Ilee , J D & Meru , F 2018 , ' Are Elias 2-27's spiral arms driven by self-gravity, or by a companion? A comparative spiral morphology study ' , Astrophysical Journal Letters , vol. 860 , no. 1 , L5 .
dc.descriptionD.H.F. gratefully acknowledges support from the ECOGAL project, grant agreement 291227, funded by the European Research Council under ERC-2011-ADG. J.D.I. and F.M. acknowledge support from the DISCSIM project, grant agreement 341137 under ERC-2013-ADG. F.M. also acknowledges support from The Leverhulme Trust, the Isaac Newton Trust, and the Royal Society Dorothy Hodgkin Fellowship. The authors warmly thank the anonymous referee for comments that helped to clarify the manuscript. This work used the Darwin DiRAC HPC cluster at the University of Cambridge, and the Cambridge COSMOS SMP system funded by ST/J005673/1, ST/H008586/1 and ST/K00333X/1 grants.en
dc.description.abstractThe spiral waves detected in the protostellar disk surrounding Elias 2-27 have been suggested as evidence of the disk being gravitationally unstable. However, previous work has shown that a massive, stable disk undergoing an encounter with a massive companion are also consistent with the observations. We compare the spiral morphology of smoothed particle hydrodynamic simulations modeling both cases. The gravitationally unstable disk produces symmetric, tightly wound spiral arms with constant pitch angle, as predicted by the literature. The companion disk's arms are asymmetric, with pitch angles that increase with radius. However, these arms are not well-fitted by standard analytic expressions, due to the high disk mass and relatively low companion mass. We note that differences (or indeed similarities) in morphology between pairs of spirals is a crucial discriminant between scenarios for Elias 2-27, and hence future studies must fit spiral arms individually. If Elias 2-27 continues to show symmetric tightly wound spiral arms in future observations, then we posit that it is the first observed example of a gravitationally unstable protostellar disk.
dc.relation.ispartofAstrophysical Journal Lettersen
dc.subjectPlanetdisk interactionsen
dc.subjectProtoplanetary disksen
dc.subjectStars: individual (Elias 227)en
dc.subjectStars: pre-main sequenceen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectAstronomy and Astrophysicsen
dc.subjectSpace and Planetary Scienceen
dc.titleAre Elias 2-27's spiral arms driven by self-gravity, or by a companion? A comparative spiral morphology studyen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Research Councilen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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