NGTS-28Ab: a short period transiting brown dwarf
We report the discovery of a brown dwarf orbiting a M1 host star. We first identified the brown dwarf within the Next Generation Transit Survey data, with supporting observations found in TESS sectors 11 and 38. We confirmed the discovery with follow-up photometry from the South African Astronomical Observatory, SPECULOOS-S, and TRAPPIST-S, and radial velocity measurements from HARPS, which allowed us to characterize the system. We find an orbital period of ∼1.25 d, a mass of $69.0^{+5.3}_{-4.8}$ MJ, close to the hydrogen burning limit, and a radius of 0.95 ± 0.05 RJ. We determine the age to be >0.5 Gyr, using model isochrones, which is found to be in agreement with spectral energy distribution fitting within errors. NGTS-28Ab is one of the shortest period systems found within the brown dwarf desert, as well as one of the highest mass brown dwarfs that transits an M dwarf. This makes NGTS-28Ab another important discovery within this scarcely populated region.
History
Author affiliation
College of Science & Engineering/Physics & AstronomyVersion
- VoR (Version of Record)
Published in
Monthly Notices of the Royal Astronomical SocietyVolume
530Issue
1Pagination
318 - 339Publisher
Oxford University Press (OUP)issn
0035-8711eissn
1365-2966Copyright date
2024Available date
2024-04-26Publisher DOI
Language
enPublisher version
Deposited by
Dr Michael GoadDeposit date
2024-04-24Data Access Statement
The TESS data is available via the MAST (Mikulski Archive for Space Telescopes) portal at https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. Data can also be downloaded from TFOP for NGTS-28A (TOI-6110) at https://exofop.ipac.caltech.edu/tess/target.php?id=7439480. Public NGTS and HARPS data are available in the ESO archive at http://archive.eso.org/eso/eso_archive_main.html. SAAO data are available on its public archive at https://ssda.saao.ac.za/. The other data within this article will be shared on reasonable request to the corresponding author. SPECMATCH-EMP, ARIADNE, and ALLESFITTER are open-source and public software.Rights Retention Statement
- No