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Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey | | P. Benni
; A. Y. Burdanov
; V. V. Krushinsky
; A. Bonfanti
; G. Hébrard
; J. M. Almenara
; S. Dalal
; O. D. S. Demangeon
; M. Tsantaki
; J. Pepper
; K. G. Stassun
; A. Vanderburg
; A. Belinski
; F. Kashaev
; K. Barkaoui
; T. Kim
; W. Kang
; K. Antonyuk
; V. V. Dyachenko
; D. A. Rastegaev
; A. Beskakotov
; A. A. Mitrofanova
; F. J. Pozuelos
; A. Popov
; F. Kiefer
; P. A. Wilson
; G. Ricker
; R. Vanderspek
; D. W. Latham
; S. Seager
; J. M. Jenkins
; E. Sokov
; I. Sokova
; A. Marchini
; R. Papini
; F. Salvaggio
; M. Banfi
; Ö. Baştürk
; Ş. Torun
; S. Yalçınkaya
; K. Ivanov
; G. Valyavin
; E. Jehin
; M. Gillon
; E. Pakštienė
; V.-P. Hentunen
; S. Shadick
; M. Bretton
; A. Wünsche
; J. Garlitz
; Y. Jongen
; D. Molina
; E. Girardin
; F. Grau Horta
; R. Naves
; Z. Benkhaldoun
; M. D. Joner
; M. Spencer
; A. Bieryla
; D. J. Stevens
; E. L. N. Jensen
; K. A. Collins
; D. Charbonneau
; E. V. Quintana
; S. E. Mullally
; C. E. Henze
; | | Date: |
24 Sep 2020 | | Abstract: | We announce the discovery of GPX-1b, a transiting brown dwarf with a mass of
$19.7pm 1.6$ $M_{mathrm{Jup}}$ and a radius of $1.47pm0.10$
$R_{mathrm{Jup}}$, the first sub-stellar object discovered by the Galactic
Plane eXoplanet (GPX) survey. The brown dwarf transits a moderately bright ($V$
= 12.3 mag) fast-rotating F-type star with a projected rotational velocity
$vsin{ i_*}sim$40 km/s, effective temperature $7000pm200$ K, mass
$1.68pm0.10$ $M_{Sun}$, radius $1.56pm0.10$ $R_{Sun}$ and approximate age
$0.27_{-0.15}^{+0.09}$ Gyr. GPX-1b has an orbital period of
$1.744579pm0.000008$ d, mid-transit time $T_0 = 2458770.23823pm0.00040$
${mathrm{BJD_{TDB}}}$ and a transit depth of $0.90pm0.03$%. We describe the
GPX transit detection observations, subsequent photometric and
speckle-interferometric follow-up observations, and SOPHIE spectroscopic
measurements, which allowed us to establish the presence of a sub-stellar
object around the host star. GPX-1 was observed at 30-min integrations by TESS
in Sector 18, but the data is affected by blending with a 3.4 mag brighter star
42 arcsec away. GPX-1b is one of about two dozen transiting brown dwarfs known
to date, with a mass close to the theoretical brown dwarf/gas giant planet mass
transition boundary. Since GPX-1 is a moderately bright and fast-rotating star,
it can be followed-up by the means of Doppler tomography. | | Source: | arXiv, 2009.11899 | | Services: | Forum | Review | PDF | Favorites | |
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