NGTS-19b : A high mass transiting brown dwarf in a 17-day eccentric orbit

Acton, Jack S.; Goad, Michael R.; Burleigh, Matthew R.; Casewell, Sarah L.; Breytenbach, Hannes; Nielsen, Louise D.; Smith, Gareth; Anderson, David R.; Battley, Matthew P.; Bayliss, Daniel; Bouchy, François; Bryant, Edward M.; Csizmadia, Szilárd; Eigmüller, Phillip; Gill, Samuel; Gillen, Edward; Grieves, Nolan; Günther, Maximilian N.; Henderson, Beth A.; Hodgkin, Simon T.; Jackman, James A. G.; Jenkins, James S.; Lendl, Monika; McCormac, James; Moyano, Maximiliano; Nelson, Richard P.; Sefako, Ramotholo R.; Smith, Alexis M. S.; Stalport, Manu; Thomas, Jessymol K.; Tilbrook, Rosanna H.; Udry, Stéphane; West, Richard G.; Wheatley, Peter J.; Worters, Hannah L.; Vines, Jose I.; Alves, Douglas R.

doi:10.48550/arxiv.2105.08574

Cited by 1 publication

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References 79 publications

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“…Besides testing substellar evolutionary models, the determination of the observational MMLB can provide a useful benchmark to understand the properties of transiting brown dwarfs for which dynamical mass determinations can also be made. There is a growing number of these systems being discovered thanks to several transit surveys (e.g., Acton et al (2021)). Comparison of their present mass, presence of lithium, stellar age, and the observational MMLB can set interesting constraints on their mass loss rate.…”

Section: Final Remarks and Future Prospectsmentioning

confidence: 99%

New constraints on the minimum mass for thermonuclear lithium burning in brown dwarfs

Martín,

Lodieu,

del Burgo

2021

Preprint

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The theory of substellar evolution predicts that there is a sharp mass boundary between lithium and non-lithium brown dwarfs, not far below the substellar-mass limit. The imprint of thermonuclear burning is carved on the surface lithium abundance of substellar-mass objects during the first few hundred million years of their evolution, leading to a sharp boundary between lithium and non-lithium brown dwarfs, so-called, the lithium test. The theoretical predictions can be tested by comparing with observations of lithium in the individual components of binaries with dynamical masses measured from orbital motions. New optical spectroscopic observations of the binaries DE-NIS J063001.4−184014AB and DENIS J225210.7−173013AB obtained using the 10.4-m Gran Telescopio de Canarias are reported here. They allow us to re-determine their combined optical spectral types (M9.5 and L6.5, respectively) and to search for the presence of the Li I resonance doublet. The non detection of the Li I feature in the combined spectrum of DENIS J063001.4−184014AB is converted into estimates for the depletion of lithium in the individual components of this binary system. In DENIS J225210.7−173013AB we report the detection of a weak Li I feature which we tentatively ascribe as arising from the contribution of the T3.5-type secondary. Combining our results with data for seven other brown dwarf binaries in the literature treated in a self-consistent way, we confirm that there is indeed a sharp transition in mass for lithium depletion in brown dwarfs, as expected from theoretical calculations. We estimate such mass boundary is observationally located at 51.48 +0.22 −4.00 M Jup , which is lower than the theoretical determinations.

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Section: Final Remarks and Future Prospectsmentioning

confidence: 99%