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An Eccentric Brown Dwarf Eclipsing an M dwarf

dc.contributor.authorCañas, C.I.
dc.contributor.authorMahadevan, S.
dc.contributor.authorBender, C.F.
dc.contributor.authorSalazar Rivera, N.I.
dc.contributor.authorMonson, A.
dc.contributor.authorBeard, C.
dc.contributor.authorLubin, J.
dc.contributor.authorRobertson, P.
dc.contributor.authorGupta, A.F.
dc.contributor.authorCochran, W.D.
dc.contributor.authorFredrick, C.
dc.contributor.authorHearty, F.
dc.contributor.authorJones, S., I
dc.contributor.authorKanodia, S.
dc.contributor.authorLin, A.S.J.
dc.contributor.authorNinan, J.P.
dc.contributor.authorRamsey, L.W.
dc.contributor.authorSchwab, C.
dc.contributor.authorStefánsson, G.
dc.date.accessioned2022-03-31T21:11:22Z
dc.date.available2022-03-31T21:11:22Z
dc.date.issued2022
dc.identifier.citationCañas, 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.
dc.identifier.issn0004-6256
dc.identifier.doi10.3847/1538-3881/ac415f
dc.identifier.urihttp://hdl.handle.net/10150/663826
dc.description.abstractWe 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.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.rightsCopyright © 2022. The American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleAn Eccentric Brown Dwarf Eclipsing an M dwarf
dc.typeArticle
dc.typetext
dc.contributor.departmentSteward Observatory, The University of Arizona
dc.identifier.journalAstronomical Journal
dc.description.noteOpen access journal
dc.description.collectioninformationThis 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.
dc.eprint.versionFinal published version
dc.source.journaltitleAstronomical Journal
refterms.dateFOA2022-03-31T21:11:22Z


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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.
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.