Occultations from an Active Accretion Disk in a 72-day Detached Post-Algol System Detected by K2
Article
Article Title | Occultations from an Active Accretion Disk in a 72-day Detached Post-Algol System Detected by K2 |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Zhou, G. (Author), Rappaport, S. (Author), Nelson, L. (Author), Huang, C. X. (Author), Senhadji, A. (Author), Rodriguez, J. E. (Author), Vanderburg, A. (Author), Quinn, S. (Author), Johnson, C. I. (Author), Latham, D. W. (Author), Torres, G. (Author), Gary, B. L. (Author), Tan, T. G. (Author), Johnson, M. C. (Author), Burt, J. (Author), Kristiansen, M. H. (Author), Jacobs, T. L. (Author), LaCourse, D. (Author), Schwengeler, H. M. (Author), Terentev, I. (Author), Bieryla, A. (Author), Esquerdo, G. A. (Author), Berlind, P. (Author), Calkins, M. L. (Author), Bento, J. (Author), Cochran, W. D. (Author), Karjalainen, M. (Author), Hatzes, A. P. (Author), Karjalainen, R. (Author), Holden, B. (Author) and Butler, R. P. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 854 (2), pp. 1-18 |
Article Number | 109 |
Number of Pages | 18 |
Year | 2018 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/aaa9b9 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/aaa9b9 |
Abstract | Disks in binary systems can cause exotic eclipsing events. MWC 882 (BD -22 4376, EPIC 225300403) is such a disk-eclipsing system identified from observations during Campaign 11 of the K2 mission. We propose that MWC 882 is a post-Algol system with a B7 donor star of mass in a 72-day orbit around an A0 accreting star of mass . The disk around the accreting star occults the donor star once every orbit, inducing 19-day long, 7% deep eclipses identified by K2 and subsequently found in pre-discovery All-Sky Automated Survey and All Sky Automated Survey for Supernovae observations. We coordinated a campaign of photometric and spectroscopic observations for MWC 882 to measure the dynamical masses of the components and to monitor the system during eclipse. We found the photometric eclipse to be gray to ≈1%. We found that the primary star exhibits spectroscopic signatures of active accretion, and we observed gas absorption features from the disk during eclipse. We suggest that MWC 882 initially consisted of a ≈3.6 M o donor star transferring mass via Roche lobe overflow to a ≈2.1 M o accretor in a ≈7-day initial orbit. Through angular momentum conservation, the donor star is pushed outward during mass transfer to its current orbit of 72 days. The observed state of the system corresponds with the donor star having left the red giant branch ∼0.3 Myr ago, terminating active mass transfer. The present disk is expected to be short-lived (102 yr) without an active feeding mechanism, presenting a challenge to this model. |
Keywords | accretion; accretion disks; binaries: eclipsing; stars: evolution; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Center for Astrophysics Harvard and Smithsonian, United States |
Massachusetts Institute of Technology, United States | |
Bishop's University, Canada | |
Hereford Arizona Observatory, United States | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Ohio State University, United States | |
Technical University of Denmark, Denmark | |
No affiliation | |
Australian National University | |
University of Texas at Austin, United States | |
Isaac Newton Group of Telescopes, Spain | |
Karl Schwarzschild Observatory, Germany | |
University of California, United States | |
Carnegie Institution of Washington, United States |
https://research.usq.edu.au/item/q6x7x/occultations-from-an-active-accretion-disk-in-a-72-day-detached-post-algol-system-detected-by-k2
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