TOI-6884b: A low-mass brown dwarf transiting a slightly evolved star

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ID: 315365
2026
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Abstract
Abstract We report the discovery of a low-mass transiting brown dwarf orbiting TOI-6884 (TIC 156514476, Tmag = 11.4) from NASA’s Transiting Exoplanet Survey Satellite (TESS) mission. The TESS light curves initially suggested an orbital period of ~14.42 days; however, our high-precision ground-based radial velocity measurements and multi-epoch time-series photometry reveal this to be a harmonic alias. We determine the true orbital period to be $4.808264^{+0.000015}_{-0.000014}$ days and confirm the substellar nature of the companion. TOI-6884b has a mass of $26.32^{+0.98}_{-0.93}M_{\rm J}$, a radius of $0.927^{+0.51}_{-0.52} R_{\rm J}$, and resides on a nearly circular orbit ($e=0.067^{+0.010}_{-0.012}$). Its host star is a late F-type slightly evolved star with $M_\star = 1.410^{+0.075}_{-0.069} M_\odot$, $R_\star = 1.840^{+0.072}_{-0.073} R_\odot$, $\log {g} = 4.057^{+0.045}_{-0.039}$, $[{\rm Fe/H}] = 0.094^{+0.073}_{-0.068}$ dex, and $T_{\rm eff}=6330^{+180}_{-160}$ K. TOI-6884b is a key addition to the small population of well-characterized transiting brown dwarfs orbiting host stars that have left the main sequence. The detection of such systems will contribute to our understanding of dynamical histories and structural evolution of short-period substellar companions around evolved stars.
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Authors Akanksha Khandelwal, Shubhendra Nath Das, Rishikesh Sharma, A. Chakraborty, C. Dwivedi, Sanjay Baliwal, Karen A Collins, David W Latham, Allyson Bieryla, Cristilyn N Watkins, F. Murgas, Norio Narita, Enric Pallé, S B Howell, Mark E. Everett, Catherine A. Clark, Polina A. Budnikova, David Ciardi, Nikitha Jithendran, Akihiko Fukui, Ashirbad Nayak, Bob Massey, Boris Safonov, Florence Libotte, Francis P Wilkin, Gregor Srdoč, Howard M. Relles, I Bonilla-Mariana, I Fukuda, Jason D. Eastman, Jerome de Leon, Jesus Higuera, Kapil Bharadwaj, Keith Horne, Kendra Nguyen, Kevikumar Lad, Manuel Pichardo Marcano, Micaela Magno, Neelam Jssv Prasad, Noriharu Watanabe, Richard P Schwarz, Sam Quinn, Santiago Paez, Toshi Suganuma, Y Gómez Maqueo Chew
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag988
URL
https://doi.org/10.1093/mnras/stag988
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