Detection of Ubiquitous Circumbinary Matter Formed from Common-Envelope Ejections

Detection of Ubiquitous Circumbinary Matter Formed from Common-Envelope Ejections | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Detection of Ubiquitous Circumbinary Matter Formed from Common-Envelope Ejections Zhanwen Han, Jiangdan Li, Christian Wolf, Yangpin Luo, Jiao Li, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4010799/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The formation of compact binary systems is canonically explained by evolution through a common envelope (CE) phase. While such binaries are ubiquitous and important, e.g., as progenitors of type Ia supernovae and black hole mergers, direct observational evidence for the CE material is elusive. The short-lived and dynamic nature of CEs poses challenges in their detection and detailed study. Numerical simulations predict that a fraction of the envelope may remain bound after CE ejections. In this article, we report for the first time the detection of such bound matter across a sample of 281 hot subdwarf binary candidates, believed to have formed in recent CE ejections. In their LAMOST spectra, we find anomalously strong calcium (Ca) II K lines arising from circumbinary matter. As expected, the radial velocities are close to the systemic velocities of the binaries, with a possible tendency for slow outflows. Physical sciences/Astronomy and planetary science/Astronomy and astrophysics/Stars Physical sciences/Astronomy and planetary science/Astronomy and astrophysics/Stellar evolution Physical sciences/Astronomy and planetary science/Astronomy and astrophysics/Compact astrophysical objects Physical sciences/Astronomy and planetary science/Astronomy and astrophysics/Astrophysical dust Physical sciences/Astronomy and planetary science/Astronomy and astrophysics/Astrophysical disks Full Text Additional Declarations There is NO Competing Interest. Supplementary Files catalogue.csv Dataset 1 Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4010799","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":280992945,"identity":"c0c33419-e1a0-441a-9883-be79c90b86ad","order_by":0,"name":"Zhanwen 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