Revisiting the Impact of Dust Production from Carbon-Rich Wolf-Rayet Binaries
Draft version June 17, 2020 Typeset using LATEX twocolumn style in AASTeX62 Revisiting the Impact of Dust Production from Carbon-Rich Wolf-Rayet Binaries Ryan M. Lau,1 J.J. Eldridge,2 Matthew J. Hankins,3 Astrid Lamberts,4 Itsuki Sakon,5 and Peredur M. Williams6 1Institute of Space & Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan 2Department of Physics, University of Auckland, Private Bag 92019, Auckland 1010, New Zealand 3Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA 4Universit´eC^oted'Azur, Observatoire de la C^oted'Azur, CNRS, Laboratoire Lagrange, Laboratoire ARTEMIS, France 5Department of Astronomy, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 6Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ (Accepted June 12, 2020) Submitted to ApJ ABSTRACT 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 −10 −6 −1 M_ d ∼ 10 − 10 M yr and carbon dust condensation fractions, χC , between 0:002 − 40%. A large (0:1 − 1:0 µm) dust grain size composition is favored for efficient dustars where χC & 1%. Results for dustars with known orbital periods verify a power-law relation between χC , orbital period, WC mass-loss rate, and wind velocity consistent with predictions from theoretical models of dust formation in colliding-wind binaries.
[Show full text]