2025AJ....170...34T

Query : 2025AJ....170...34T

2025AJ....170...34T - Astron. J., 170, 34 (2025/July-0)

The True Stellar Obliquity of a Sub-Saturn Planet from the Tierras Observatory and the Keck Planet Finder.

TAMBURO P., YEE S.W., GARCIA-MEJIA J., STEFANSSON G., CHARBONNEAU D., BIERYLA A., HOWARD A.W., ISAACSON H., FULTON B.J. and HOUSEHOLDER A.

Abstract (from CDS):

We measure the true obliquity of TOI-2364, a K dwarf with a sub-Saturn-mass (Mp = 0.18 MJ) transiting planet on the upper edge of the hot-Neptune desert. We used new Rossiter-McLaughlin observations gathered with the Keck Planet Finder to measure the sky-projected obliquity λ = 7° + 10°-11°. Combined with a stellar rotation period of 23.47 ± 0.29 days measured with photometry from the Tierras Observatory, this yields a stellar inclination of 90° ± 13° and a true obliquity ψ = 15:6 + 7:7-7:3, indicating that the planet's orbit is well aligned with the rotation axis of its host star. The determination of ψ is important for investigating a potential bimodality in the orbits of short-period sub-Saturns around cool stars, which tend to be either aligned with or perpendicular to their host stars' spin axes.

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

Journal keyword(s): Exoplanet astronomy - Exoplanet systems - Planet hosting stars - Planetary alignment - Infrared photometry - Transits - Stellar rotation - Starspots

Status at CDS : Associated data (images, light curves, etc...) being ingested in VizieR.

Simbad objects: 2

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Number of rows : 2
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 TOI-2364 * 05 56 31.1936699267 -05 00 43.067307526   13.128 12.289 12.103   ~ 10 0
2 TOI-2364b Pl 05 56 31.1936699267 -05 00 43.067307526           ~ 3 0

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