2025ApJ...995L..40P

Query : 2025ApJ...995L..40P

2025ApJ...995L..40P - Astrophys. J., 995, L40 (2025/December-3)

Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b.

PECK A.E., ROBERSON W., NIELSEN E.L., DE ROSA R.J., JONES N., WANG J., MACINTOSH B.A., LEWIS B.L., DUCHENE G., METCHEV S., ABBAS A., XUAN J.W., SANGHI A., PATIENCE J., BARMAN T.S., BULGER J., CHILCOTE J.K., ESPOSITO T.M., FITZGERALD M.P., FOLLETTE K.B., GALLAMORE H., GOODSELL S., GRAHAM J.R., GREENBAUM A.Z., HIBON P., INGRAHAM P., KALAS P., KONOPACKY Q.M., MARCHIS F., MAIRE J., MAROIS C., MATTHEWS B., MAWET D., MILLAR-BLANCHAER M.A., OPPENHEIMER R., PALMER D.W., PERRIN M.D., POYNEER L., PUEYO L., RAJAN A., RAMEAU J., RANTAKYRO F.T., REN B., RUFFIO J.-B., SAVRANSKY D., SCHNEIDER A.C., SIVARAMAKRISHNAN A., SMITH A.J.R.W., SONG I., SOUMMER R., THOMAS S., WARD-DUONG K. and WOLFF S.G.

Abstract (from CDS):

HD 143811 AB is the host star to the directly imaged planet HD 143811 AB b, which was recently discovered using data from the Gemini Planet Imager and Keck NIRC2. A member of the Sco-Cen star-forming region with an age of 13 ± 4 Myr, HD 143811 AB is somewhat rare among hosts of directly imaged planets, as it is a close stellar binary, with an ∼18-day period. Accurate values for the orbital and stellar parameters of this binary are needed to understand the formation and evolutionary history of the planet in orbit. We utilize archival high-resolution spectroscopy from FEROS on the MPG/ESO 2.2 m telescope to fit the orbit of the binary, and we combine with unresolved photometry to derive the basic stellar properties of the system. From the orbit, we derive precise values of orbital period of 18.59090 ± 0.00007 days and mass ratio of 0.886 ± 0.003. When combined with stellar evolutionary models, we find masses of both components of ${M}_{{\rm{A}}}=1.3{0}_{-0.05}^{+0.03}$M⊙ and ${M}_{{\rm{B}}}=1.1{5}_{-0.04}^{+0.03}$M⊙. While the current data are consistent with the planet and stellar orbits being coplanar, the 3D orientations of both systems are currently poorly constrained, with additional observations required to more rigorously test for coplanarity.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Binary stars - Planet hosting stars - Exoplanets - Spectroscopic binary stars

Simbad objects: 13

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Number of rows : 13
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 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
2 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 * 51 Eri b Pl 04 37 36.1326090888 -02 28 24.775726260           ~ 238 0
4 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
5 HD 95086b Pl 10 57 03.0215719872 -68 40 02.449216128           ~ 127 1
6 HD 95086 * 10 57 03.0215719872 -68 40 02.449216128   7.60 7.36     A8III 208 1
7 HD 106906B BD* 12 17 52.61 -55 58 26.6           L2.5 115 0
8 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
9 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
10 HD 143811b Pl? 16 03 33.4250542272 -30 08 13.379590788           ~ 3 0
11 HD 143811 ** 16 03 33.4250542272 -30 08 13.379590788   9.37 8.91     F5V 45 0
12 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
13 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1

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