학술논문
Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey
Document Type
Working Paper
Author
Benni, P.; Burdanov, A. Y.; Krushinsky, V. V.; Bonfanti, A.; Hébrard, G.; Almenara, J. M.; Dalal, S.; Demangeon, O. D. S.; Tsantaki, M.; Pepper, J.; Stassun, K. G.; Vanderburg, A.; Belinski, A.; Kashaev, F.; Barkaoui, K.; Kim, T.; Kang, W.; Antonyuk, K.; Dyachenko, V. V.; Rastegaev, D. A.; Beskakotov, A.; Mitrofanova, A. A.; Pozuelos, F. J.; Kuznetsov, E. D.; Popov, A.; Kiefer, F.; Wilson, P. A.; Ricker, G.; Vanderspek, R.; Latham, D. W.; Seager, S.; Jenkins, J. M.; Sokov, E.; Sokova, I.; Marchini, A.; Papini, R.; Salvaggio, F.; Banfi, M.; Baştürk, Ö.; Torun, Ş.; Yalçınkaya, S.; Ivanov, K.; Valyavin, G.; Jehin, E.; Gillon, M.; Pakštienė, E.; Hentunen, V. -P.; Shadick, S.; Bretton, M.; Wünsche, A.; Garlitz, J.; Jongen, Y.; Molina, D.; Girardin, E.; Horta, F. Grau; Naves, R.; Benkhaldoun, Z.; Joner, M. D.; Spencer, M.; Bieryla, A.; Stevens, D. J.; Jensen, E. L. N.; Collins, K. A.; Charbonneau, D.; Quintana, E. V.; Mullally, S. E.; Henze, C. E.
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Subject
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Abstract
We announce the discovery of GPX-1 b, a transiting brown dwarf with a mass of $19.7\pm 1.6$ $M_{\mathrm{Jup}}$ and a radius of $1.47\pm0.10$ $R_{\mathrm{Jup}}$, 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 $v\sin{ i_*}=40\pm10$ km/s. We use the isochrone placement algorithm to characterize the host star, which has effective temperature $7000\pm200$ K, mass $1.68\pm0.10$ $M_{\mathrm{Sun}}$, radius $1.56\pm0.10$ $R_{\mathrm{Sun}}$ and approximate age $0.27_{-0.15}^{+0.09}$ Gyr. GPX-1 b has an orbital period of $\sim$1.75 d, and a transit depth of $0.90\pm0.03$ %. 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-1 b 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.
Comment: 13 pages, 13 figures, accepted to MNRAS in May 2021
Comment: 13 pages, 13 figures, accepted to MNRAS in May 2021