A study of convective core overshooting as a function of stellar mass based on two-dimensional hydrodynamical simulations
dc.contributor.author | Baraffe, I | |
dc.contributor.author | Clarke, J | |
dc.contributor.author | Morison, A | |
dc.contributor.author | Vlaykov, DG | |
dc.contributor.author | Constantino, T | |
dc.contributor.author | Goffrey, T | |
dc.contributor.author | Guillet, T | |
dc.contributor.author | Le Saux, A | |
dc.contributor.author | Pratt, J | |
dc.date.accessioned | 2023-01-20T09:29:18Z | |
dc.date.issued | 2023-01-06 | |
dc.date.updated | 2023-01-19T17:27:48Z | |
dc.description.abstract | We perform two-dimensional (2D) numerical simulations of core convection for zero-age main-sequence stars covering a mass range from 3 to 20 M. The simulations are performed with the fully compressible time-implicit code MUSIC. We study the efficiency of overshooting, which describes the ballistic process of convective flows crossing a convective boundary, as a function of stellar mass and luminosity. We also study the impact of artificially increasing the stellar luminosity for 3 M models. The simulations cover hundreds to thousands of convective turnover time-scales. Applying the framework of extreme plume events previously developed for convective envelopes, we derive overshooting lengths as a function of stellar masses. We find that the overshooting distance (dov) scales with the stellar luminosity (L) and the convective core radius (rconv). We derive a scaling law dov ∝ L1/3r1/2 conv, which isimplemented in a one-dimensionalstellar evolution code and the resulting stellar models are compared to observations. The scaling predicts values for the overshooting distance that significantly increase with stellar mass, in qualitative agreement with observations. Quantitatively, however, the predicted values are underestimated for masses 10 M. Our 2D simulations show the formation of a nearly adiabatic layer just above the Schwarzschild boundary of the convective core, as exhibited in recent three-dimensionalsimulations of convection. The most luminous modelsshow a growth in size with time of the nearly adiabatic layer. This growth seemsto slow down asthe upper edge of the nearly adiabatic layer gets closer to the maximum overshooting length and as the simulation time exceeds the typical thermal diffusive time-scale in the overshooting layer. | en_GB |
dc.description.sponsorship | Science and Technology Facilities Council | en_GB |
dc.description.sponsorship | European Commission | en_GB |
dc.format.extent | 5333-5344 | |
dc.identifier.citation | Vol. 519, No. 4, pp. 5333-5344 | en_GB |
dc.identifier.doi | https://doi.org/10.1093/mnras/stad009 | |
dc.identifier.grantnumber | ST/R000395/1 | en_GB |
dc.identifier.grantnumber | 787361-COBOM | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/132284 | |
dc.identifier | ORCID: 0000-0001-8365-5982 (Baraffe, I) | |
dc.identifier | ORCID: 0000-0002-1402-9125 (Vlaykov, DG) | |
dc.identifier | ScopusID: 55735436300 (Vlaykov, DG) | |
dc.identifier | ORCID: 0000-0002-0271-5953 (Guillet, T) | |
dc.language.iso | en | en_GB |
dc.publisher | Oxford University Press | en_GB |
dc.rights | The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. | en_GB |
dc.subject | convection | en_GB |
dc.subject | hydrodynamics | en_GB |
dc.subject | stars: evolution | en_GB |
dc.title | A study of convective core overshooting as a function of stellar mass based on two-dimensional hydrodynamical simulations | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2023-01-20T09:29:18Z | |
dc.identifier.issn | 0035-8711 | |
dc.description | This is the final version. Available from Oxford University Press via the DOI in this record. | en_GB |
dc.identifier.eissn | 1365-2966 | |
dc.identifier.journal | Monthly Notices of the Royal Astronomical Society | en_GB |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society, 519(4) | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2022-12-23 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2023-01-06 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2023-01-20T09:21:52Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2023-01-20T09:29:24Z | |
refterms.panel | B | en_GB |
refterms.dateFirstOnline | 2023-01-06 |
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Except where otherwise noted, this item's licence is described as The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided
the original work is properly cited.