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2023ApJ...951L..29D - Astrophys. J., 951, L29 (2023/July-2)

TOI-1859b: A 64 Day Warm Jupiter on an Eccentric and Misaligned Orbit.

DONG J., WANG S., RICE M., ZHOU G., HUANG C.X., DAWSON R.I., STEFANSSON G.K., HALVERSON S., KANODIA S., MAHADEVAN S., McELWAIN M.W., ALVARADO-MONTES J.A., NINAN J.P., ROBERTSON P., ROY A., SCHWAB C., LOGSDON S.E., TERRIEN R.C., COLLINS K.A., SRDOC G., SEFAKO R., LALOUM D., LATHAM D.W., BIERYLA A., DALBA P.A., DRAGOMIR D., VILLANUEVA S.Jr, HOWELL S.B., RICKER G.R., SEAGER S., WINN J.N., JENKINS J.M., SHPORER A. and RAPETTI D.

Abstract (from CDS):

Warm Jupiters are close-in giant planets with relatively large planet-star separations (i.e., 10 < a/R⋆ < 100). Given their weak tidal interactions with their host stars, measurements of stellar obliquity may be used to probe the initial obliquity distribution and dynamical history for close-in gas giants. Using spectroscopic observations, we confirm the planetary nature of TOI-1859b and determine the stellar obliquity of TOI-1859 to be λ = 38.9${}_{-2.7}^{+2.8}$° relative to its planetary companion using the Rossiter-McLaughlin effect. TOI-1859b is a 64 day warm Jupiter orbiting around a late F dwarf and has an orbital eccentricity of 0.57${}_{-0.16}^{+0.12}$ inferred purely from transit light curves. The eccentric and misaligned orbit of TOI-1859b is likely an outcome of dynamical interactions, such as planet-planet scattering and planet-disk resonance crossing.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Extrasolar gaseous giant planets - Exoplanet dynamics - Radial velocity - Transit photometry

Simbad objects: 4

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