NGTS-28Ab: a short period transiting brown dwarf

Beth A Henderson; Sarah L Casewell; Michael R Goad; Jack S Acton; Maximilian N Günther; Louise D Nielsen; Matthew R Burleigh; Claudia Belardi; Rosanna H Tilbrook; Oliver Turner; Steve B Howell; Catherine A Clark; Colin Littlefield; Khalid Barkaoui; Douglas R Alves; David R Anderson; Daniel Bayliss; Francois Bouchy; Edward M Bryant; George Dransfield; Elsa Ducrot; Philipp Eigmüller; Samuel Gill; Edward Gillen; Michaël Gillon; Faith Hawthorn; Matthew J Hooton; James A G Jackman; Emmanuel Jehin; James S Jenkins; Alicia Kendall; Monika Lendl; James McCormac; Maximiliano Moyano; Peter Pihlmann Pedersen; Francisco J Pozuelos; Gavin Ramsay; Ramotholo R Sefako; Mathilde Timmermans; Amaury H M J Triaud; Stephane Udry; Jose I Vines; Christopher A Watson; Richard G West; Peter J Wheatley; Sebastián Zúñiga-Fernández

doi:10.1093/mnras/stae508

NGTS-28Ab: a short period transiting brown dwarf

Beth A Henderson^*, Sarah L Casewell^*, Michael R Goad, Jack S Acton, Maximilian N Günther, Louise D Nielsen, Matthew R Burleigh, Claudia Belardi, Rosanna H Tilbrook, Oliver Turner, Steve B Howell, Catherine A Clark, Colin Littlefield, Khalid Barkaoui, Douglas R Alves, David R Anderson, Daniel Bayliss, Francois Bouchy, Edward M Bryant, George DransfieldElsa Ducrot, Philipp Eigmüller, Samuel Gill, Edward Gillen, Michaël Gillon, Faith Hawthorn, Matthew J Hooton, James A G Jackman, Emmanuel Jehin, James S Jenkins, Alicia Kendall, Monika Lendl, James McCormac, Maximiliano Moyano, Peter Pihlmann Pedersen, Francisco J Pozuelos, Gavin Ramsay, Ramotholo R Sefako, Mathilde Timmermans, Amaury H M J Triaud, Stephane Udry, Jose I Vines, Christopher A Watson, Richard G West, Peter J Wheatley, Sebastián Zúñiga-Fernández

^*Corresponding author for this work

Physics and Astronomy

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Abstract

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 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 discovery within this scarcely populated region.

Original language	English
Pages (from-to)	318-339
Number of pages	22
Journal	Monthly Notices of the Royal Astronomical Society
Volume	530
Issue number	1
Early online date	21 Feb 2024
DOIs	https://doi.org/10.1093/mnras/stae508
Publication status	Published - May 2024

Keywords

(stars:) brown dwarfs

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HendersonB2024NGTS28AbFinal published version, 9.07 MBLicence: Creative Commons: Attribution (CC BY)

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Henderson, B. A., Casewell, S. L., Goad, M. R., Acton, J. S., Günther, M. N., Nielsen, L. D., Burleigh, M. R., Belardi, C., Tilbrook, R. H., Turner, O., Howell, S. B., Clark, C. A., Littlefield, C., Barkaoui, K., Alves, D. R., Anderson, D. R., Bayliss, D., Bouchy, F., Bryant, E. M., ... Zúñiga-Fernández, S. (2024). NGTS-28Ab: a short period transiting brown dwarf. Monthly Notices of the Royal Astronomical Society, 530(1), 318-339. https://doi.org/10.1093/mnras/stae508

@article{e76f4c8f1b51470891b91dc8cb0256e3,

title = "NGTS-28Ab: a short period transiting brown dwarf",

abstract = "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.",

keywords = "(stars:) brown dwarfs",

author = "Henderson, {Beth A} and Casewell, {Sarah L} and Goad, {Michael R} and Acton, {Jack S} and G{\"u}nther, {Maximilian N} and Nielsen, {Louise D} and Burleigh, {Matthew R} and Claudia Belardi and Tilbrook, {Rosanna H} and Oliver Turner and Howell, {Steve B} and Clark, {Catherine A} and Colin Littlefield and Khalid Barkaoui and Alves, {Douglas R} and Anderson, {David R} and Daniel Bayliss and Francois Bouchy and Bryant, {Edward M} and George Dransfield and Elsa Ducrot and Philipp Eigm{\"u}ller and Samuel Gill and Edward Gillen and Micha{\"e}l Gillon and Faith Hawthorn and Hooton, {Matthew J} and Jackman, {James A G} and Emmanuel Jehin and Jenkins, {James S} and Alicia Kendall and Monika Lendl and James McCormac and Maximiliano Moyano and Pedersen, {Peter Pihlmann} and Pozuelos, {Francisco J} and Gavin Ramsay and Sefako, {Ramotholo R} and Mathilde Timmermans and Triaud, {Amaury H M J} and Stephane Udry and Vines, {Jose I} and Watson, {Christopher A} and West, {Richard G} and Wheatley, {Peter J} and Sebasti{\'a}n Z{\'u}{\~n}iga-Fern{\'a}ndez",

year = "2024",

month = may,

doi = "10.1093/mnras/stae508",

language = "English",

volume = "530",

pages = "318--339",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "SIPRI/Oxford University Press",

number = "1",

}

Henderson, BA, Casewell, SL, Goad, MR, Acton, JS, Günther, MN, Nielsen, LD, Burleigh, MR, Belardi, C, Tilbrook, RH, Turner, O, Howell, SB, Clark, CA, Littlefield, C, Barkaoui, K, Alves, DR, Anderson, DR, Bayliss, D, Bouchy, F, Bryant, EM, Dransfield, G, Ducrot, E, Eigmüller, P, Gill, S, Gillen, E, Gillon, M, Hawthorn, F, Hooton, MJ, Jackman, JAG, Jehin, E, Jenkins, JS, Kendall, A, Lendl, M, McCormac, J, Moyano, M, Pedersen, PP, Pozuelos, FJ, Ramsay, G, Sefako, RR, Timmermans, M , Triaud, AHMJ, Udry, S, Vines, JI, Watson, CA, West, RG, Wheatley, PJ & Zúñiga-Fernández, S 2024, 'NGTS-28Ab: a short period transiting brown dwarf', Monthly Notices of the Royal Astronomical Society, vol. 530, no. 1, pp. 318-339. https://doi.org/10.1093/mnras/stae508

TY - JOUR

T1 - NGTS-28Ab

T2 - a short period transiting brown dwarf

AU - Henderson, Beth A

AU - Casewell, Sarah L

AU - Goad, Michael R

AU - Acton, Jack S

AU - Günther, Maximilian N

AU - Nielsen, Louise D

AU - Burleigh, Matthew R

AU - Belardi, Claudia

AU - Tilbrook, Rosanna H

AU - Turner, Oliver

AU - Howell, Steve B

AU - Clark, Catherine A

AU - Littlefield, Colin

AU - Barkaoui, Khalid

AU - Alves, Douglas R

AU - Anderson, David R

AU - Bayliss, Daniel

AU - Bouchy, Francois

AU - Bryant, Edward M

AU - Dransfield, George

AU - Ducrot, Elsa

AU - Eigmüller, Philipp

AU - Gill, Samuel

AU - Gillen, Edward

AU - Gillon, Michaël

AU - Hawthorn, Faith

AU - Hooton, Matthew J

AU - Jackman, James A G

AU - Jehin, Emmanuel

AU - Jenkins, James S

AU - Kendall, Alicia

AU - Lendl, Monika

AU - McCormac, James

AU - Moyano, Maximiliano

AU - Pedersen, Peter Pihlmann

AU - Pozuelos, Francisco J

AU - Ramsay, Gavin

AU - Sefako, Ramotholo R

AU - Timmermans, Mathilde

AU - Triaud, Amaury H M J

AU - Udry, Stephane

AU - Vines, Jose I

AU - Watson, Christopher A

AU - West, Richard G

AU - Wheatley, Peter J

AU - Zúñiga-Fernández, Sebastián

PY - 2024/5

Y1 - 2024/5

N2 - 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.

AB - 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.

KW - (stars:) brown dwarfs

U2 - 10.1093/mnras/stae508

DO - 10.1093/mnras/stae508

M3 - Article

SN - 0035-8711

VL - 530

SP - 318

EP - 339

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

NGTS-28Ab: a short period transiting brown dwarf

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