BU Canis Minoris - the most compact known flat doubly eclipsing quadruple system

0580640 - FZÚ 2024 RIV US eng J - Journal Article
Pribulla, T. - Borkovits, T. - Jayaraman, R. - Mašek, Martin … Total 28 authors
BU Canis Minoris - the most compact known flat doubly eclipsing quadruple system.
Monthly Notices of the Royal Astronomical Society. Roč. 524, č. 3 (2023), s. 4220-4238. ISSN 0035-8711. E-ISSN 1365-2966
R&D Projects: GA MŠMT(CZ) EF18_046/0016007; GA MŠMT LTT18004; GA MŠMT(CZ) EF18_046/0016010; GA MŠMT EF16_013/0001402
Research Infrastructure: AUGER-CZ III - 90232
Institutional support: RVO:68378271
Keywords : eclipsing binaries * spectroscopic binaries * BU CM * Solar and Stellar Astrophysics
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.8, year: 2022
Method of publishing: Limited access
https://doi.org/10.1093/mnras/stad2015

We have found that the 2+2 quadruple star system BU CMi is currently the most compact quadruple system known, with an extremely short outer period of only 121 d. The previous record holder was TIC 219006972 (Kostov et al.), with a period of 168 d. The quadruple nature of BU CMi was established by Volkov, Kravtsova & Chochol, but they misidentified the outer period as 6.6 yr. BU CMi contains two eclipsing binaries (EBs), each with a period near 3 d, and a substantial eccentricity of ≃0.22. All four stars are within ~0.1 M⊙ of 2.4 M⊙. Both binaries exhibit dynamically driven apsidal motion with fairly short apsidal periods of ≃30 yr, due to the short outer orbital period. The outer period of 121 d is found both from the dynamical perturbations, with this period imprinted on the eclipse timing variations curve of each EB by the other binary, and by modelling the complex line profiles in a collection of spectra.
Permanent Link: https://hdl.handle.net/11104/0349409