Secular changes in the orbits of the quadruple system VW LMi

Pribulla, T.; Puha, E.; Borkovits, T.; Budaj, J.; Garai, Z.; Guenther, E. W.; Hambálek, Ľ.; Komžík, R.; Kundra, E.; Szabó, Gy. M.; Vaňko, M.

doi:10.1093/mnras/staa699

Cited by 11 publications

(9 citation statements)

References 36 publications

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“…The most compact among known 2+2 quadruples is VW LMi (11029+3035, HD 95660) with an outer period of only 355 days [79]. The inner periods are 7.93 and 0.48 days.…”

Section: Compact Hierarchiesmentioning

confidence: 99%

Architecture of Hierarchical Stellar Systems and Their Formation

Tokovinin

2021

Universe

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Accumulation of new data on stellar hierarchical systems and the progress in numerical simulations of their formation open the door to genetic classification of these systems, where properties of a certain group (family) of objects are tentatively related to their formation mechanisms and early evolution. A short review of the structure and statistical trends of known stellar hierarchies is given. Like binaries, they can be formed by the disk and core fragmentation events happening sequentially or simultaneously and followed by the evolution of masses and orbits driven by continuing accretion of gas and dynamical interactions between stars. Several basic formation scenarios are proposed and associated qualitatively with the architecture of real systems, although quantitative predictions for these scenarios are still pending. The general trend of increasing orbit alignment with decreasing system size points to the critical role of the accretion-driven orbit migration, which also explains the typically comparable masses of stars belonging to the same system. The architecture of some hierarchies bears imprints of chaotic dynamical interactions. Characteristic features of each family are illustrated by several real systems.

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“…The most compact among known 2+2 quadruples is VW LMi (11029+3035, HD 95660) with an outer period of only 355 days [79]. The inner periods are 7.93 and 0.48 days.…”

Section: Compact Hierarchiesmentioning

confidence: 99%

Architecture of Hierarchical Stellar Systems and Their Formation

Tokovinin

2021

Universe

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“…Therefore, we can conclude that, as was expected, the omission of the quadratic ETV term in the complex spectro-photodynamical analysis did not influence our basic solutions, but suggests that the 12 We emphasize that this holds only for doubly eclipsing 2+2 quadruples. The shortest period known 2+2 quadruple system, VW LMi has a much shorter outer period of Pout = 355 days (Pribulla et al 2008(Pribulla et al , 2020. Furthermore, in the case of the doubly eclipsing quadruple star EPIC 220204960 Rappaport et al (2017) reported that the outer period is very likely between 300 and 500 d, but an accurate value for that system is unknown.…”

Section: Orbital Configurationmentioning

confidence: 99%

BG Ind: the nearest doubly eclipsing, compact hierarchical quadruple system

Borkovits

Rappaport

Maxted

et al. 2021

Monthly Notices of the Royal Astronomical Society

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BG Ind is a well studied, bright, nearby binary consisting of a pair of F stars in a 1.46-day orbit. We have discovered in the TESS lightcurve for TIC 229804573 (aka BG Ind) a second eclipsing binary in the system with a 0.53-day. Our subsequent analyses of the recent TESS and archival ground-based photometric and radial velocity data, reveal that the two binaries are gravitationally bound in a 721-day period, moderately eccentric orbit. We present the results of a joint spectro-photodynamical analysis of the eclipse timing variation curves of both binaries based on TESS and ground-based archival data, the TESS lightcurve, archival radial velocity data and the spectral energy distribution, coupled with the use of PARSEC stellar isochrones. We confirm prior studies of BG Ind which found that the brighter binary A consists of slightly evolved F-type stars with refined masses of 1.32 and 1.43 M⊙, and radii of 1.59 and 2.34 R⊙. The previously unknown binary B has two less massive stars of 0.69 and 0.64 M⊙ and radii of 0.64 and 0.61 R⊙. Based on a number of different arguments which we discuss, we conclude that the three orbital planes are likely aligned to within 17○.

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“…The median period of the outer orbit was found to be P out = 858 +7 −5 d, with a moderate eccentricity of e out = 0.36 +0.02 −0.03 . (For comparison, note that the tightest known 2+2 quadruple system, VW LMi, has an outer period of P out = 355 d and eccentricity of e out < 0.1, see Pribulla et al 2008Pribulla et al , 2020 One should keep in mind, however, that while the bound quadruple nature of the system is certainly beyond question, the quantitative results on the orbital parameters of the outer orbit should be considered only with caution. The reason is, that the TESS observations cover only a fraction of an outer or-bital period and, furthermore, the four former, seasonal WASP minima have large uncertainties.…”

Section: Dynamical Properties Of the Quadruplementioning

confidence: 99%

TIC 278956474: Two Close Binaries in One Young Quadruple System Identified by TESS

Rowden

Borkovits

Jenkins

et al. 2020

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We have identified a quadruple system with two close eclipsing binaries in TESS data. The object is unresolved in Gaia and appears as a single source at parallax 1.08 ±0.01 mas. Both binaries have observable primary and secondary eclipses and were monitored throughout TESS Cycle 1 (sectors 1-13), falling within the TESS Continuous Viewing Zone. In one eclipsing binary (P = 5.488 d), the smaller star is completely occluded by the larger star during the secondary eclipse; in the other (P = 5.674 d) both eclipses are grazing. Using these data, spectroscopy, speckle photometry, SED analysis and evolutionary stellar tracks, we have constrained the masses and radii of the four stars in the two eclipsing binaries. The Li I EW indicates an age of 10-50 Myr and, with an outer period of 858 +7 −5 days, our analysis indicates this is one of the most compact young 2+2 quadruple systems known.

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Secular changes in the orbits of the quadruple system VW LMi

Cited by 11 publications

References 36 publications

Architecture of Hierarchical Stellar Systems and Their Formation

Architecture of Hierarchical Stellar Systems and Their Formation

BG Ind: the nearest doubly eclipsing, compact hierarchical quadruple system

TIC 278956474: Two Close Binaries in One Young Quadruple System Identified by TESS

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