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Binary fraction indicators in resolved stellar populations and supernova- type ratios

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Stanway, Elizabeth R., Eldridge, J. J. and Chrimes, Ashley (2020) Binary fraction indicators in resolved stellar populations and supernova- type ratios. Monthly Notices of the Royal Astronomical Society, 497 (2). pp. 2201-2212. doi:10.1093/mnras/staa2089

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Official URL: https://doi.org/10.1093/mnras/staa2089

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Abstract

The binary fraction of a stellar population can have pronounced effects on its properties, and in particular the number counts of different massive star types, and the relative subtype rates of the supernovae which end their lives. Here we use binary population synthesis models with a binary fraction that varies with initial mass to test the effects on resolved stellar pops and supernovae, and ask whether these can constrain the poorly-known binary fraction in different mass and metallicity regimes. We show that Wolf-Rayet star subtype ratios are valuable binary diagnostics, but require large samples to distinguish by models. Uncertainties in which stellar models would be spectroscopically classified as Wolf-Rayet stars are explored. The ratio of thermonuclear, stripped envelope and other core-collapse supernovae may prove a more accessible test and upcoming surveys will be sufficient to constrain both the high mass and low mass binary fraction in the z < 1 galaxy population.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Astrophysics, Galaxies, Stars -- Formation, Double stars -- Spectra
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: September 2020
Dates:
DateEvent
September 2020Published
17 July 2020Available
13 July 2020Accepted
Date of first compliant deposit: 21 July 2020
Volume: 497
Number: 2
Page Range: pp. 2201-2212
DOI: 10.1093/mnras/staa2089
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record E R Stanway, J J Eldridge, A A Chrimes, Binary fraction indicators in resolved stellar populations and supernova-type ratios, Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 2, September 2020, Pages 2201–2212, is available online at:https://doi.org/10.1093/mnras/staa2089
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/P000495/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/T000406/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
1763016 [STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDUniversity of Aucklandhttp://dx.doi.org/10.13039/501100001537
UNSPECIFIEDRoyal Society of New Zealandhttp://dx.doi.org/10.13039/501100001509
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