An Eccentric Brown Dwarf Eclipsing an M dwarf
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Steward Observatory, The University of ArizonaIssue Date
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American Astronomical SocietyCitation
Cañas, C. I., Mahadevan, S., Bender, C. F., Salazar Rivera, N. I., Monson, A., Beard, C., Lubin, J., Robertson, P., Gupta, A. F., Cochran, W. D., Fredrick, C., Hearty, F., Jones, S., Kanodia, S., Lin, A. S. J., Ninan, J. P., Ramsey, L. W., Schwab, C., & Stefánsson, G. (2022). An Eccentric Brown Dwarf Eclipsing an M dwarf. Astronomical Journal.Journal
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Copyright © 2022. The American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We report the discovery of an M = 67 ± 2M J brown dwarf transiting the early M dwarf TOI-2119 on an eccentric orbit (e = 0.3362 ± 0.0005) at an orbital period of 7.200861 ± 0.000005 days. We confirm the brown dwarf nature of the transiting companion using a combination of ground-based and space-based photometry and high-precision velocimetry from the Habitable-zone Planet Finder. Detection of the secondary eclipse with TESS photometry enables a precise determination of the eccentricity and reveals the brown dwarf has a brightness temperature of 2100 ± 80 K, a value which is consistent with an early L dwarf. TOI-2119 is one of the most eccentric known brown dwarfs with P < 10 days, possibly due to the long circularization timescales for an object orbiting an M dwarf. We assess the prospects for determining the obliquity of the host star to probe formation scenarios and the possibility of additional companions in the system using Gaia EDR3 and our radial velocities. © 2022. The American Astronomical Society. All rights reserved.Note
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Except where otherwise noted, this item's license is described as Copyright © 2022. The American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.