TOI-1994b: A Low-mass Eccentric Brown Dwarf Transiting A Subgiant Star

Emma Page, Joshua Pepper, Duncan Wright, Joseph E. Rodriguez, Robert A. Wittenmyer, Stephen R. Kane, Brett Addison, Timothy Bedding, Brendan P. Bowler, Thomas Barclay, Karen A. Collins, Phil Evans, Jonathan Horner, Eric L.N. Jensen, Marshall C. Johnson, John Kielkopf, Ismael Mireles, Peter Plavchan, Samuel N. Quinn, S. SeagerAvi Shporer, Keivan G. Stassun, Stephanie Striegel, Joshua N. Winn, George Zhou, Carl Ziegler

Research output: Contribution to journalArticlepeer-review


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 − 410 + 720 K, V magnitude of 10.51 mag and log(g) of 3.982 − 0.065 + 0.067 . The brown dwarf has a mass of 22.1 − 2.5 + 2.6 M J, a period of 4.034 days, an eccentricity of 0.341 − 0.059 + 0.054 , and a radius of 1.220 − 0.071 + 0.082 R J. 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.

Original languageEnglish (US)
Article number109
JournalAstronomical Journal
Issue number3
StatePublished - Mar 1 2024

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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