Confirmed Detection of Lithium in Nearby Young Late-M Dwarfs

Phan Bao Ngoc, Michael S. Bessell
Author affiliations

Authors

  • Phan Bao Ngoc \(^1\)Department of Physics, International University, Ho Chi Minh City, Vietnam;
    \(^2\)Vietnam National University, Ho Chi Minh City, Vietnam
    https://orcid.org/0000-0002-4481-0094
  • Michael S. Bessell Research School of Astronomy and Astrophysics, Australian National University, Cotter Rd, Weston, ACT 2611, Australia

DOI:

https://doi.org/10.15625/0868-3166/16323

Abstract

Brown dwarfs in nearby young associations and moving groups are excellent benchmarks for studying
physical properties of these substellar objects at different ages as well as their formation mechanism.
In our previous search for nearby young brown dwarfs, we reported the first clear detection of the lithium absorption line in three late-M dwarfs and a marginal detection in one late-M dwarf.
Based on our new spectroscopic observations, we confirm our previous detection of lithium in
the four late-M dwarfs. We also confirm the presence of lithium in one brown dwarf binary that has
previously been reported in the literature. Using theoretical models, we estimate the age and the mass of these late-M dwarfs. We then use a Bayesian analysis tool for determining the membership probability of these young late-M dwarfs to nearby young moving groups.

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References

B. Zuckerman and I. Song, Young stars near the sun, Annu. Rev. Astron. Astrophys. 42 (2004) 685.

J. Gagné and J. K. Faherty, Banyan. xiii. a first look at nearby young associations with gaia data release 2, Astrophys. J. 862 (2018) 138.

T. Antoja, F. Figueras, J. Torra, O. Valenzuela and B. Pichardo, The origin of stellar moving groups, Lecture Notes and Essays in Astrophysics, 4 (2010) 13.

J. Gagné, J. K. Faherty, L. Moranta and M. Popinchalk, A number of nearby moving groups may be fragments of dissolving open clusters, The Astrophysical Journal Letters 915 (2021) L29.

D. Nguyen-Thanh, N. Phan-Bao, S. J. Murphy and M. S. Bessell, Sporadic and intense accretion in a 1 myr-old brown dwarf candidate, Astron. Astrophys. 634 (2020) A128.

A. Magazzù, E. L. Martín and R. Rebolo, A spectroscopic test for substellar objects, Astrophys. J. 404 (1993) L17.

R. Rebolo, E. L. Martín and A. Magazzù, Spectroscopy of a brown dwarf candidate in the alpha persei open cluster, Astrophys. J. 389 (1992) L83.

Y. V. Pavlenko, R. Rebolo, E. L. Martín and R. J. García L´opez, Formation of lithium lines in very cool dwarfs., Astron. Astrophys. 303 (1995) 807.

G. Basri, Observations of brown dwarfs, Annu. Rev. Astron. Astrophys. 38 (2000) 485.

N. Phan-Bao, M. S. Bessell, D. Nguyen-Thanh, E. L. Martín, P. T. P. Ho, C.-F. Lee et al., Detection of lithium in nearby young late-m dwarfs, Astron. Astrophys. 600 (2017) A19.

A. Reiners, A. Seifahrt and S. Dreizler, Discovery of a nearby young brown dwarf binary candidate, Astron. Astrophys. 513 (2010) L9.

A. Reiners and G. Basri, A volume-limited sample of 63 m7–m9.5 dwarfs. i. space motion, kinematic age, and lithium, Astrophys. J. 705 (2009) 1416.

A. J. Weinberger, A. P. Boss, S. A. Keiser, G. Anglada-Escudé, I. B. Thompson and G. Burley, Trigonometric parallaxes and proper motions of 134 southern late m, l, and t dwarfs from the carnegie astrometric planet search program, Astron. J. 152 (2016) 24.

C. C. Dahn et al., Ccd parallaxes for 309 late-type dwarfs and subdwarfs, Astron. J. 154 (2017) 147.

M. Dopita, J. Hart, P. McGregor, P. Oates, G. Bloxham and D. Jones, The wide field spectrograph (wifes), Astrophys. Space Sci. 310 (2007) 255.

K. Shortridge, H. Meyerdierks, M. J. Currie, M. Clayton, J. Lockley, A. Charles et al., Figaro: A general data reduction system version 5.6-3 user’s guide, Starlink User Note 86 (2004) .

F. Crifo, N. Phan-Bao and X. Delfosse et al., New neighbours: Vi. spectroscopy of denis nearby stars candidates, Astron. Astrophys. 441 (2005) 653.

E. L. Martín, X. Delfosse and S. Guieu, Spectroscopic identification of denis-selected brown dwarf candidates in the upper scorpius ob association, Astron. J. 127 (2004) 449.

F. Allard, D. Homeier, B. Freytag, W. Schaffenberger and A. S. Rajpurohit, Progress in modeling very low mass stars, brown dwarfs, and planetary mass objects, Mem. Soc. Astron. Ital. 24 (2013) 128.

J. Gagné et al.Astrophys. J. 856 (2018) 23.

J. Gagné, D. Lafrenière, R. Doyon, L. Malo and E. Artigau, Banyan. v. a systematic all-sky survey for new very late-type low-mass stars and brown dwarfs in nearby young moving groups, Astrophys. J. 798 (2015) 73.

J. Gagné, D. Lafrenière, R. Doyon, L. Malo and E. Artigau, Banyan. ii. very low mass and substellar candidate

members to nearby, young kinematic groups with previously known signs of youth, Astrophys. J. 783 (2014) 121.

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Published

27-03-2022

How to Cite

[1]
P. B. Ngoc and M. S. Bessell, “Confirmed Detection of Lithium in Nearby Young Late-M Dwarfs”, Comm. Phys., vol. 32, no. 2, p. 133, Mar. 2022.

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Papers
Received 28-07-2021
Accepted 27-10-2021
Published 27-03-2022