NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf

James A. G. Jackman; Peter J. Wheatley; Dan Bayliss; Samuel Gill; Simon T. Hodgkin; Matthew R. Burleigh; Ian P. Braker; Maximilian N. Günther; Tom Louden; Oliver Turner; David R. Anderson; Claudia Belardi; François Bouchy Joshua T. Briegal; Edward M. Bryant; Juan Cabrera; Sarah L. Casewell; Alexander Chaushev; Jean C. Costes; Szilard Csizmadia; Philipp Eigmüller; Anders Erikson; Boris T. Gänsicke; Edward Gillen; Michael R. Goad; James S. Jenkins; James McCormac; Maximiliano Moyano; Louise D. Nielsen; Don Pollacco; Katja Poppenhaeger; Didier Queloz; Heike Rauer; Liam Raynard; Alexis M. S. Smith; Stéphane Udry; Jose I. Vines; Christopher A. Watson; Richard G. West

doi:10.1093/mnras/stz2496

NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf

James A. G. Jackman
, Peter J. Wheatley
, Dan Bayliss
, Samuel Gill
, Simon T. Hodgkin
, Matthew R. Burleigh
, Ian P. Braker
, Maximilian N. Günther
, Tom Louden
, Oliver Turner
, David R. Anderson
, Claudia Belardi
, François Bouchy Joshua T. Briegal
, Edward M. Bryant
, Juan Cabrera
, Sarah L. Casewell
, Alexander Chaushev
, Jean C. Costes
, Szilard Csizmadia
, Philipp Eigmüller

Anders Erikson, Boris T. Gänsicke, Edward Gillen, Michael R. Goad, James S. Jenkins, James McCormac, Maximiliano Moyano, Louise D. Nielsen, Don Pollacco, Katja Poppenhaeger, Didier Queloz, Heike Rauer, Liam Raynard, Alexis M. S. Smith, Stéphane Udry, Jose I. Vines, Christopher A. Watson, Richard G. West

School of Mathematics and Physics

Research output: Contribution to journal › Article › peer-review

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255 Downloads (Pure)

Abstract

We present the discovery of NGTS-7Ab, a high mass brown dwarf transiting an M dwarf with a period of 16.2 hours, discovered as part of the Next Generation Transit Survey (NGTS). This is the shortest period transiting brown dwarf around a main or pre-main sequence star to date. The M star host (NGTS-7A) has an age of roughly 55 Myr and is in a state of spin-orbit synchronisation, which we attribute to tidal interaction with the brown dwarf acting to spin up the star. The host star is magnetically active and shows multiple flares across the NGTS and follow up lightcurves, which we use to probe the flare-starspot phase relation. The host star also has an M star companion at a separation of 1.13 arcseconds with very similar proper motion and systemic velocity, suggesting the NGTS-7 system is a hierarchical triple. The combination of tidal synchronisation and magnetic braking is expected to drive ongoing decay of the brown dwarf orbit, with a remaining lifetime of only 5-10 Myr.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society, Advance Access
DOIs	https://doi.org/10.1093/mnras/stz2496
Publication status	Published - 11 Sept 2019

Keywords

stars: brown dwarfs
stars: low mass
stars: rotation
stars: individual: NGTS-7A
stars: flare

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NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf
C 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. Please refer to any applicable terms of use of the publisher.
Final published version, 5.42 MBLicence: Unspecified

Understand thy star, understand thy planet
Costes, J. (Author), Watson, C. (Supervisor) & de Mooij, E. (Supervisor), Dec 2021
Student thesis: Doctoral Thesis › Doctor of Philosophy

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Jackman, J. A. G., Wheatley, P. J., Bayliss, D., Gill, S., Hodgkin, S. T., Burleigh, M. R., Braker, I. P., Günther, M. N., Louden, T., Turner, O., Anderson, D. R., Belardi, C., Briegal, F. B. J. T., Bryant, E. M., Cabrera, J., Casewell, S. L., Chaushev, A., Costes, J. C., Csizmadia, S., ... West, R. G. (2019). NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf. Monthly Notices of the Royal Astronomical Society, Advance Access. https://doi.org/10.1093/mnras/stz2496

@article{76f01aa65bb046028d0045442593d89d,

title = "NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf",

abstract = "We present the discovery of NGTS-7Ab, a high mass brown dwarf transiting an M dwarf with a period of 16.2 hours, discovered as part of the Next Generation Transit Survey (NGTS). This is the shortest period transiting brown dwarf around a main or pre-main sequence star to date. The M star host (NGTS-7A) has an age of roughly 55 Myr and is in a state of spin-orbit synchronisation, which we attribute to tidal interaction with the brown dwarf acting to spin up the star. The host star is magnetically active and shows multiple flares across the NGTS and follow up lightcurves, which we use to probe the flare-starspot phase relation. The host star also has an M star companion at a separation of 1.13 arcseconds with very similar proper motion and systemic velocity, suggesting the NGTS-7 system is a hierarchical triple. The combination of tidal synchronisation and magnetic braking is expected to drive ongoing decay of the brown dwarf orbit, with a remaining lifetime of only 5-10 Myr.",

keywords = "stars: brown dwarfs, stars: low mass, stars: rotation, stars: individual: NGTS-7A, stars: flare",

author = "Jackman, \{James A. G.\} and Wheatley, \{Peter J.\} and Dan Bayliss and Samuel Gill and Hodgkin, \{Simon T.\} and Burleigh, \{Matthew R.\} and Braker, \{Ian P.\} and G{\"u}nther, \{Maximilian N.\} and Tom Louden and Oliver Turner and Anderson, \{David R.\} and Claudia Belardi and Briegal, \{Fran{\c c}ois Bouchy Joshua T.\} and Bryant, \{Edward M.\} and Juan Cabrera and Casewell, \{Sarah L.\} and Alexander Chaushev and Costes, \{Jean C.\} and Szilard Csizmadia and Philipp Eigm{\"u}ller and Anders Erikson and G{\"a}nsicke, \{Boris T.\} and Edward Gillen and Goad, \{Michael R.\} and Jenkins, \{James S.\} and James McCormac and Maximiliano Moyano and Nielsen, \{Louise D.\} and Don Pollacco and Katja Poppenhaeger and Didier Queloz and Heike Rauer and Liam Raynard and Smith, \{Alexis M. S.\} and St{\'e}phane Udry and Vines, \{Jose I.\} and Watson, \{Christopher A.\} and West, \{Richard G.\}",

year = "2019",

month = sep,

day = "11",

doi = "10.1093/mnras/stz2496",

language = "English",

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

issn = "0035-8711",

publisher = "Oxford University Press",

}

Jackman, JAG, Wheatley, PJ, Bayliss, D, Gill, S, Hodgkin, ST, Burleigh, MR, Braker, IP, Günther, MN, Louden, T, Turner, O, Anderson, DR, Belardi, C, Briegal, FBJT, Bryant, EM, Cabrera, J, Casewell, SL, Chaushev, A, Costes, JC, Csizmadia, S, Eigmüller, P, Erikson, A, Gänsicke, BT, Gillen, E, Goad, MR, Jenkins, JS, McCormac, J, Moyano, M, Nielsen, LD, Pollacco, D, Poppenhaeger, K, Queloz, D, Rauer, H, Raynard, L, Smith, AMS, Udry, S, Vines, JI, Watson, CA & West, RG 2019, 'NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf', Monthly Notices of the Royal Astronomical Society, Advance Access. https://doi.org/10.1093/mnras/stz2496

TY - JOUR

T1 - NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf

AU - Jackman, James A. G.

AU - Wheatley, Peter J.

AU - Bayliss, Dan

AU - Gill, Samuel

AU - Hodgkin, Simon T.

AU - Burleigh, Matthew R.

AU - Braker, Ian P.

AU - Günther, Maximilian N.

AU - Louden, Tom

AU - Turner, Oliver

AU - Anderson, David R.

AU - Belardi, Claudia

AU - Briegal, François Bouchy Joshua T.

AU - Bryant, Edward M.

AU - Cabrera, Juan

AU - Casewell, Sarah L.

AU - Chaushev, Alexander

AU - Costes, Jean C.

AU - Csizmadia, Szilard

AU - Eigmüller, Philipp

AU - Erikson, Anders

AU - Gänsicke, Boris T.

AU - Gillen, Edward

AU - Goad, Michael R.

AU - Jenkins, James S.

AU - McCormac, James

AU - Moyano, Maximiliano

AU - Nielsen, Louise D.

AU - Pollacco, Don

AU - Poppenhaeger, Katja

AU - Queloz, Didier

AU - Rauer, Heike

AU - Raynard, Liam

AU - Smith, Alexis M. S.

AU - Udry, Stéphane

AU - Vines, Jose I.

AU - Watson, Christopher A.

AU - West, Richard G.

PY - 2019/9/11

Y1 - 2019/9/11

N2 - We present the discovery of NGTS-7Ab, a high mass brown dwarf transiting an M dwarf with a period of 16.2 hours, discovered as part of the Next Generation Transit Survey (NGTS). This is the shortest period transiting brown dwarf around a main or pre-main sequence star to date. The M star host (NGTS-7A) has an age of roughly 55 Myr and is in a state of spin-orbit synchronisation, which we attribute to tidal interaction with the brown dwarf acting to spin up the star. The host star is magnetically active and shows multiple flares across the NGTS and follow up lightcurves, which we use to probe the flare-starspot phase relation. The host star also has an M star companion at a separation of 1.13 arcseconds with very similar proper motion and systemic velocity, suggesting the NGTS-7 system is a hierarchical triple. The combination of tidal synchronisation and magnetic braking is expected to drive ongoing decay of the brown dwarf orbit, with a remaining lifetime of only 5-10 Myr.

AB - We present the discovery of NGTS-7Ab, a high mass brown dwarf transiting an M dwarf with a period of 16.2 hours, discovered as part of the Next Generation Transit Survey (NGTS). This is the shortest period transiting brown dwarf around a main or pre-main sequence star to date. The M star host (NGTS-7A) has an age of roughly 55 Myr and is in a state of spin-orbit synchronisation, which we attribute to tidal interaction with the brown dwarf acting to spin up the star. The host star is magnetically active and shows multiple flares across the NGTS and follow up lightcurves, which we use to probe the flare-starspot phase relation. The host star also has an M star companion at a separation of 1.13 arcseconds with very similar proper motion and systemic velocity, suggesting the NGTS-7 system is a hierarchical triple. The combination of tidal synchronisation and magnetic braking is expected to drive ongoing decay of the brown dwarf orbit, with a remaining lifetime of only 5-10 Myr.

KW - stars: brown dwarfs

KW - stars: low mass

KW - stars: rotation

KW - stars: individual: NGTS-7A

KW - stars: flare

U2 - 10.1093/mnras/stz2496

DO - 10.1093/mnras/stz2496

M3 - Article

SN - 0035-8711

JO - Monthly Notices of the Royal Astronomical Society, Advance Access

JF - Monthly Notices of the Royal Astronomical Society, Advance Access

ER -

NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf

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Keywords

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Understand thy star, understand thy planet

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