eprintid: 10191948 rev_number: 6 eprint_status: archive userid: 699 dir: disk0/10/19/19/48 datestamp: 2024-05-08 10:16:35 lastmod: 2024-05-08 10:16:35 status_changed: 2024-05-08 10:16:35 type: article metadata_visibility: show sword_depositor: 699 creators_name: Henderson, Beth A creators_name: Casewell, Sarah L creators_name: Goad, Michael R creators_name: Acton, Jack S creators_name: Guenther, Maximilian N creators_name: Nielsen, Louise D creators_name: Burleigh, Matthew R creators_name: Belardi, Claudia creators_name: Tilbrook, Rosanna H creators_name: Turner, Oliver creators_name: Howell, Steve B creators_name: Clark, Catherine A creators_name: Littlefield, Colin creators_name: Barkaoui, Khalid creators_name: Alves, Douglas R creators_name: Anderson, David R creators_name: Bayliss, Daniel creators_name: Bouchy, Francois creators_name: Bryant, Edward M creators_name: Dransfield, George creators_name: Ducrot, Elsa creators_name: Eigmueller, Philipp creators_name: Gill, Samuel creators_name: Gillen, Edward creators_name: Gillon, Michael creators_name: Hawthorn, Faith creators_name: Hooton, Matthew J creators_name: Jackman, James AG creators_name: Jehin, Emmanuel creators_name: Jenkins, James S creators_name: Kendall, Alicia creators_name: Lendl, Monika creators_name: Mccormac, James creators_name: Moyano, Maximiliano creators_name: Pedersen, Peter Pihlmann creators_name: Pozuelos, Francisco J creators_name: Ramsay, Gavin creators_name: Sefako, Ramotholo R creators_name: Timmermans, Mathilde creators_name: Triaud, Amaury HMJ creators_name: Udry, Stephane creators_name: Vines, Jose creators_name: Watson, Christopher A creators_name: West, Richard G creators_name: Wheatley, Peter J creators_name: Zuniga-Fernandez, Sebastian title: NGTS-28Ab: a short period transiting brown dwarf ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F63 keywords: (stars:) brown dwarfs note: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. abstract: We report the disco v ery of a brown dwarf orbiting a M1 host star. We first identified the brown dwarf within the Next Generation Transit Surv e y data, with supporting observations found in TESS sectors 11 and 38. We confirmed the disco v ery 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 M J , close to the hydrogen burning limit, and a radius of 0.95 ±0.05 R J . 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 disco v ery within this scarcely populated region. date: 2024-05 date_type: published publisher: OXFORD UNIV PRESS official_url: http://dx.doi.org/10.1093/mnras/stae508 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2272412 doi: 10.1093/mnras/stae508 lyricists_name: Bryant, Edward lyricists_id: EBRYA96 actors_name: Flynn, Bernadette actors_id: BFFLY94 actors_role: owner funding_acknowledgements: ST/M001962/1 [UK Science and Technology Facilities Council (STFC)]; ST/S002642/1 [UK Science and Technology Facilities Council (STFC)]; ST/W003163/1 [UK Science and Technology Facilities Council (STFC)]; 105.20G9 [European Southern Observatory under ESO programme]; [NASA Explorer Program]; [Gaia Multilateral Agreement] full_text_status: public publication: Monthly Notices of the Royal Astronomical Society volume: 530 number: 1 pagerange: 318-339 pages: 22 issn: 0035-8711 citation: Henderson, Beth A; Casewell, Sarah L; Goad, Michael R; Acton, Jack S; Guenther, Maximilian N; Nielsen, Louise D; Burleigh, Matthew R; ... Zuniga-Fernandez, Sebastian; + view all <#> Henderson, Beth A; Casewell, Sarah L; Goad, Michael R; Acton, Jack S; Guenther, Maximilian N; Nielsen, Louise D; Burleigh, Matthew R; Belardi, Claudia; Tilbrook, Rosanna H; Turner, Oliver; Howell, Steve B; Clark, Catherine A; Littlefield, Colin; Barkaoui, Khalid; Alves, Douglas R; Anderson, David R; Bayliss, Daniel; Bouchy, Francois; Bryant, Edward M; Dransfield, George; Ducrot, Elsa; Eigmueller, Philipp; Gill, Samuel; Gillen, Edward; Gillon, Michael; Hawthorn, Faith; Hooton, Matthew J; Jackman, James AG; Jehin, Emmanuel; Jenkins, James S; Kendall, Alicia; Lendl, Monika; Mccormac, James; Moyano, Maximiliano; Pedersen, Peter Pihlmann; Pozuelos, Francisco J; Ramsay, Gavin; Sefako, Ramotholo R; Timmermans, Mathilde; Triaud, Amaury HMJ; Udry, Stephane; Vines, Jose; Watson, Christopher A; West, Richard G; Wheatley, Peter J; Zuniga-Fernandez, Sebastian; - view fewer <#> (2024) NGTS-28Ab: a short period transiting brown dwarf. Monthly Notices of the Royal Astronomical Society , 530 (1) pp. 318-339. 10.1093/mnras/stae508 <https://doi.org/10.1093/mnras%2Fstae508>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10191948/1/stae508.pdf