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Revisiting the Impact of Dust Production from Carbon-rich Wolf–Rayet Binaries

Lau, Ryan M. and Eldridge, J. J. and Hankins, Matthew J. and Lamberts, Astrid and Sakon, Itsuki and Williams, Peredur M. (2020) Revisiting the Impact of Dust Production from Carbon-rich Wolf–Rayet Binaries. Astrophysical Journal, 898 (1). Art. No. 74. ISSN 1538-4357.

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We present a dust spectral energy distribution (SED) and binary stellar population analysis revisiting the dust production rates (DPRs) in the winds of carbon-rich Wolf–Rayet (WC) binaries and their impact on galactic dust budgets. DustEM SED models of 19 Galactic WC "dustars" reveal DPRs of Ṁ_d ~ 10⁻¹⁰-10⁻⁶ M_⊙ yr⁻¹ and carbon dust condensation fractions, χ C , between 0.002% and 40%. A large (0.1–1.0 μm) dust grain size composition is favored for efficient dustars where χ_C ≳ 1%. Results for dustars with known orbital periods verify a power-law relation between χ_C , orbital period, WC mass-loss rate, and wind velocity consistent with predictions from theoretical models of dust formation in colliding-wind binaries. We incorporated dust production into Binary Population and Spectral Synthesis (BPASS) models to analyze dust production rates from WC dustars, asymptotic giant branch stars (AGBs), red supergiants (RSGs), and core-collapse supernovae (SNe). BPASS models assuming constant star formation (SF) and a coeval 10⁶ M_⊙ stellar population were performed at low, Large Magellanic Cloud (LMC)–like, and solar metallicities (Z = 0.001, 0.008, and 0.020). Both constant SF and coeval models indicate that SNe are net dust destroyers at all metallicities. Constant SF models at LMC-like metallicities show that AGB stars slightly outproduce WC binaries and RSGs by factors of 2–3, whereas at solar metallicities WC binaries are the dominant source of dust for ~60 Myr until the onset of AGBs, which match the dust input of WC binaries. Coeval population models show that, for "bursty" SF, AGB stars dominate dust production at late times (t ≳ 70 Myr).

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Eldridge, J. J.0000-0002-1722-6343
Hankins, Matthew J.0000-0001-9315-8437
Lamberts, Astrid0000-0001-8740-0127
Sakon, Itsuki0000-0001-7641-5497
Williams, Peredur M.0000-0002-8092-980X
Additional Information:© 2020. The American Astronomical Society. Received 2019 November 25; revised 2020 May 18; accepted 2020 June 12; published 2020 July 24. We thank T. Onaka, I. Endo, M. Buragohain, E. Lagadec, T. Nozawa, A. Soulain, T. Bakx, T. Takeuchi, and M. Corcoran for enlightening discussions on dust, SNe, AGBs, RSGs, and WR binaries. We also thank Greg Sloan for guidance in assessing the quality of ISO/SWS data. We would also like to thank the anonymous referee for their careful review and insightful comments that have improved the focus and clarity of our work. P.M.W. thanks the Institute for Astronomy for continued hospitality and access to the facilities of the Royal Observatory. R.M.L. acknowledges the Japan Aerospace Exploration Agency's International Top Young Fellowship. This work is based in part on observations made with the Spitzer Space Telescope, obtained from the NASA/IPAC Infrared Science Archive, both of which are operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with the National Aeronautics and Space Administration. Based in part on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 097.D-0707(A). Based in part on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands, and the United Kingdom) and with the participation of ISAS and NASA. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Facilities: Spitzer(IRS - , IRAC - , and MIPS) - , WISE - , ISO(SWS) - , VLT(VISIR). - Software: BPASS, DustEM, MIRA.
Funding AgencyGrant Number
Japan Aerospace Exploration Agency (JAXA)UNSPECIFIED
European Southern Observatory (ESO)097.D-0707(A)
Subject Keywords:Circumstellar dust ; Wolf-Rayet stars ; Infrared astronomy ; WC stars ; Interstellar dust
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Circumstellar dust (236); Wolf-Rayet stars (1806); Infrared astronomy (786); WC stars (1793); Interstellar dust (836)
Record Number:CaltechAUTHORS:20200724-100654391
Persistent URL:
Official Citation:Ryan M. Lau et al 2020 ApJ 898 74
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104564
Deposited By: George Porter
Deposited On:24 Jul 2020 19:45
Last Modified:24 Jul 2020 19:45

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