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  Two close binaries across the hydrogen-burning limit in the Praesepe open cluster

Lodieu, N., Burgo, C. d., Manjavacas, E., Osorio, M. R. Z., Alvarez, C., Béjar, V. J. S., et al. (2020). Two close binaries across the hydrogen-burning limit in the Praesepe open cluster. Monthly Notices of the Royal Astronomical Society, 498(3), 3964-3974. doi:10.1093/mnras/staa2538.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-20CC-F Version Permalink: http://hdl.handle.net/21.11116/0000-0007-2209-9
Genre: Journal Article

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 Creators:
Lodieu, N, Author
Burgo, C del, Author
Manjavacas, E, Author
Osorio, M R Zapatero, Author
Alvarez, C, Author
Béjar, V J S, Author
Boudreault, Steve1, Author              
Lyke, J, Author
Rebolo, R, Author
Chinchilla, P, Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: (stars:) binaries: general, stars: late-type, open clusters: Praesepe
 MPIS_PROJECTS: JUICE: SWI
 Abstract: We present Keck I/OSIRIS and Keck II/NIRC2 adaptive optics imaging of two member candidates of the Praesepe stellar cluster (d = 186.18±0.11 pc; 590–790 Myr), UGCS J08451066+2148171 (L1.5±0.5) and UGCS J08301935+2003293 (no spectroscopic classification). We resolved UGCS J08451066+2148171 into a binary system in the near-infrared, with a K-band wavelength flux ratio of 0.89±0.04, a projected separation of 60.3±1.3 mas (11.2±0.7 au; 1σ). We also resolved UGCS J08301935+2003293 into a binary system with a flux ratio of 0.46±0.03 and a separation of 62.5±0.9 mas. Assuming zero eccentricity, we estimate minimum orbital periods of ∼100 years for both systems. According to theoretical evolutionary models, we derive masses in the range of 0.074–0.078 M⊙ and 0.072–0.076 M⊙ for the primary and secondary of UGCS J08451066+2148171 for an age of 700±100 Myr. In the case of UGCS J08301935+2003293, the primary is a low-mass star at the stellar/substellar boundary (0.070–0.078 M⊙) while the companion candidate might be a brown dwarf (0.051–0.065 M⊙). These are the first two binaries composed of L dwarfs in Praesepe. They are benchmark systems to derive the location of the substellar limit at the age and metallicity of Praesepe, determine the age of the cluster based on the lithium depletion boundary test, derive dynamical masses, and improve low-mass stellar and substellar evolutionary models at a well-known age and metallicity.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa2538
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 498 (3) Sequence Number: - Start / End Page: 3964 - 3974 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150