Document Type

Article

Publication Date

3-1-2024

Published In

The Astronomical Journal

Abstract

We present the discovery of TOI-1994b, a low-mass brown dwarf transiting a hot subgiant star on a moderately eccentric orbit. TOI-1994 has an effective temperature of 7700 +720/-410 K, V magnitude of 10.51 mag and log(g) of 3.982 +0.067/-0.065. The brown dwarf has a mass of 22.1 +2.6/-2.5 MJ, a period of 4.034 days, an eccentricity of 0.341 +0.054/-0.059, and a radius of 1.220 +0.082/-0.071 RJ. TOI-1994b is more eccentric than other transiting brown dwarfs with similar masses and periods. The population of low-mass brown dwarfs may have properties similar to planetary systems if they were formed in the same way, but the short orbital period and high eccentricity of TOI-1994b may contrast this theory. An evolved host provides a valuable opportunity to understand the influence stellar evolution has on the substellar companion's fundamental properties. With precise age, mass, and radius, the global analysis and characterization of TOI-1994b augments the small number of transiting brown dwarfs and allows the testing of substellar evolution models.

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Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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This work is freely available under a Creative Commons license.

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