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Lookup NU author(s): Dr Dominic BowmanORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Massive stars are progenitors of supernovae, neutron stars and black holes. During the hydrogen-core burning phase, their convective cores are the prime drivers of their evolution, but inferences of core masses are subject to unconstrained boundary mixing processes. Moreover, uncalibrated transport mechanisms can lead to strong envelope mixing and differential radial rotation. Ascertaining the efficiency of the transport mechanisms is challenging because of a lack of observational constraints. Here we deduce the convective core mass and robustly demonstrate non-rigid radial rotation in a supernova progenitor, the 12 solar-mass hydrogen-burning star HD 192575, using asteroseismology, Transiting Exoplanet Survey Satellite photometry, high-resolution spectroscopy and Gaia astrometry. We infer a convective core mass (2.9 solar masses), and find the core to be rotating between 1.4 and 6.3 times faster than the stellar envelope, depending on the location of the rotational shear layer. Our results deliver a robust inferred core mass of a massive star using asteroseismology from space-based photometry. HD 192575 is a unique anchor point for studying interior rotation and mixing processes, and thus also angular momentum transport mechanisms inside massive stars.
Author(s): Burssens S, Bowman DM, Michielsen M, Simón-Díaz S, Aerts C, Vanlaer V, Banyard G, Nardetto N, Townsend RHD, Handler G, Mombarg JSG, Vanderspek R, Ricker G
Publication type: Article
Publication status: Published
Journal: Nature Astronomy
Year: 2023
Volume: 7
Pages: 913-930
Print publication date: 01/08/2023
Online publication date: 22/06/2023
Acceptance date: 19/04/2023
Date deposited: 18/11/2024
ISSN (electronic): 2397-3366
Publisher: Springer Nature
URL: https://doi.org/10.1038/s41550-023-01978-y
DOI: 10.1038/s41550-023-01978-y
ePrints DOI: 10.57711/bswa-de62
Data Access Statement: The cycle 2 TESS data for HD 192575 can be retrieved from the MAST archive (https://archive.stsci.edu/). For information regarding the HERMES spectra, we refer to http://www.mercator.iac.es. The full frequency list in machine-readable format and the MESA/GYRE inlists needed to reproduce our results and figures are available through the open repository Zenodo (doi: 10.5281/zenodo.7823538).
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