2021MNRAS.505.4956B

Query : 2021MNRAS.505.4956B

2021MNRAS.505.4956B - Mon. Not. R. Astron. Soc., 505, 4956-4967 (2021/August-3)

Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey.

BENNI P., BURDANOV A.Y., KRUSHINSKY V.V., BONFANTI A., HEBRARD 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., BASTURK O., TORUN S., YALCINKAYA S., IVANOV K., VALYAVIN G., JEHIN E., GILLON M., PAKSTIENE E., HENTUNEN V.-P., SHADICK S., BRETTON M., WUNSCHE A., GARLITZ J., JONGEN Y., MOLINA D., GIRARDIN E., GRAU HORTA F., 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. and HENZE C.E.

Abstract (from CDS):

We announce the discovery of GPX-1 b, a transiting brown dwarf with a mass of 19.7 ± 1.6 MJup and a radius of 1.47 ± 0.10 RJup, the first substellar 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 vsini*=40±10 km s–1. We use the isochrone placement algorithm to characterize the host star, which has effective temperature 7000 ± 200 K, mass 1.68 ± 0.10 M☉, radius 1.56 ± 0.10 R☉, and approximate age 0.27–0.15+0.09 Gyr. GPX-1 b has an orbital period of ∼1.75 d and a transit depth of 0.90 ± 0.03 per cent. 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 substellar object around the host star. GPX-1 was observed at 30-min integrations by TESS in Sector 18, but the data are 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 the Doppler tomography.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): stars: brown dwarfs - stars: individual: GPX-1 - stars: rotation - surveys: Astronomical Data bases - Galaxy: disc

Nomenclature: Fig. 1, Table 1: GPX-Na (Nos 1, 1b), GPX-TF-NNA-NNNN (No. -TF18A-1859).

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 KELT-1b Pl 00 01 26.9168207928 +39 23 01.784206464           ~ 149 0
2 KELT-1 Em* 00 01 26.9168207928 +39 23 01.784206464   11.23 10.63     F5 73 0
3 HD 15691 * 02 33 24.6722572776 +56 01 06.566754936   9.55 9.00     F5 5 0
4 UCAC4 731-024744 EB* 02 33 28.6057674360 +56 01 32.548681642   12.767 12.266     F2 10 0
5 GPX-1b Pl? 02 33 28.6057674360 +56 01 32.548681642           ~ 19 0
6 Cl Trumpler 2 OpC 02 36 14.9 +55 54 32           ~ 124 0
7 HATS-70b Pl 07 16 25.0880019528 -31 14 39.858342180           ~ 50 0
8 HATS-70 * 07 16 25.0880019528 -31 14 39.858342180   12.07 12.23     ~ 26 0
9 NAME KPS-TF3-663 Pl 11 00 40.1822513592 +64 57 50.341495572           ~ 22 0
10 WASP-128 * 11 31 26.0933129952 -41 41 22.301154528   12.98 12.37 12.36 11.74 G0V 24 0
11 WASP-30 * 23 53 38.0549675760 -10 07 05.095516692   12.15 11.91 11.51 10.83 F8V 53 0
12 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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