TIC 5724661: A Long-period Binary with a Pulsating sdB Star and δ Scuti Variable
Article
Article Title | TIC 5724661: A Long-period Binary with a Pulsating sdB Star and δ Scuti Variable |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Jayaraman, Rahul, Rappaport, Saul, Nelson, Lorne, Kurtz, Donald W., Dufresne, George, Handler, Gerald, Senhadji, Abdel, Latham, David W., Zhou, George, Bieryla, Allyson and Ricker, George R. |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 936 (2), pp. 1-14 |
Article Number | 123 |
Number of Pages | 14 |
Year | 2022 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ac84d0 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ac84d0 |
Abstract | Using TESS 20 s cadence data, we have discovered an unusual combination of pulsating stars in what we infer to be a binary system. The binary consists of a standard δ Scuti star with pulsations over the range 32-41 day−1; this is in a likely wide orbit with a hot subdwarf-B (sdB) star, which itself has a large-amplitude p-mode pulsation at 524 day−1. We establish constraints on the period of the putative binary by using radial velocity measurements of the δ Scuti star and show that any sdB companion star must orbit with a period greater than approximately thirty days. Our identification of this sdB binary serves as an important addition to the relatively small number of sdB binaries known to have orbital periods longer than a few days. We model such a binary using MESA and find that this system could be formed through stable, nonconservative mass transfer from either a low-mass or an intermediate-mass progenitor, without undergoing a common-envelope phase. |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Funder | Science Mission Directorate |
Byline Affiliations | Massachusetts Institute of Technology, United States |
Bishop's University, Canada | |
North-West University, South Africa | |
University of Central Lancashire, United Kingdom | |
Nicolaus Copernicus Astronomical Center, Poland | |
University of New South Wales | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Centre for Astrophysics |
https://research.usq.edu.au/item/x41wq/tic-5724661-a-long-period-binary-with-a-pulsating-sdb-star-and-scuti-variable
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