POSEIDON II: The Anti-Aligned Orbit of the Warm Neptune TOI-1710 A b

Abstract

We present an observation of the Rossiter-McLaughlin effect for the TOI-1710 system with the NEID spectrograph on the WIYN 3.5 m telescope. The system hosts a warm Neptune ($P\sim 24$ days), and our observations reveal that it orbits in the opposite direction to the stellar spin, with a sky-projected obliquity $\lambda =179\pm 19^{\circ }$. Combined with information about the rotation period of the host star, we measure a true obliquity $\psi =158_{-13}^{+11}{}^{\circ }$. The host star has an M-dwarf companion at a separation of $\sim 3600$ au, but this companion is too distant to be solely responsible for misaligning the warm Neptune. The host star also shows a long-term radial velocity trend, indicative of a companion at intermediate separations. We show that such a companion can dynamically couple the warm Neptune to the distant M dwarf, enabling the transfer of inclination from the wide binary orbit to the planetary orbit. Assuming this scenario is correct, we predict the intermediate companion is a $\sim 5M_J$ planet on a $\sim 15$ au orbit that is nearly aligned with the transiting planet's orbit.

11 pages, 3 figures. Accepted for publication in ApJ Letters

References in corpus (35)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The NumPy array: a structure for efficient numerical computation
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Gaia Data Release 3: Summary of the content and survey properties
• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators
• A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
• Astrometric exoplanet detection with Gaia
• The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
• CERES: A Set of Automated Routines for Echelle Spectra
• A Guide to Realistic Uncertainties on Fundamental Properties of Solar-Type Exoplanet Host Stars
• Satellite dynamics on the Laplace surface
• Steady-state planet migration by the Kozai-Lidov mechanism in stellar binaries
• On the Inference of a Star's Inclination Angle from its Rotation Velocity and Projected Rotation Velocity
• APASS Landolt-Sloan BVgri photometry of RAVE stars. I. Data, effective temperatures and reddenings
• The Warm Neptune GJ 3470b has a Polar Orbit
• ZASPE: A Code to Measure Stellar Atmospheric Parameters and their Covariance from Spectra
• DREAM I. Orbital architecture orrery
• A backward-spinning star with two coplanar planets
• The TESS-Keck Survey XX: 15 New TESS Planets and a Uniform RV Analysis of all Survey Targets
• Orbital Parameter Determination for Wide Stellar Binary Systems in the Age of Gaia
• The polar orbit of the warm Neptune GJ436b seen with VLT/ESPRESSO
• K2-290: a warm Jupiter and a mini-Neptune in a triple-star system
• The Aligned Orbit of the Eccentric Proto Hot Jupiter TOI-3362b
• Are WASP-107-like Systems Consistent with High-eccentricity Migration?
• On the formation of hot and warm Jupiters via secular high-eccentricity migration in stellar triples
• HATS-38 b and WASP-139 b join a growing group of hot Neptunes on polar orbits
• The chaotic history of the retrograde multi-planet system in K2-290A driven by distant stars
• Prospects from TESS and Gaia to constrain the flatness of planetary systems
• The Spin-Orbit Alignment of 8 Warm Gas Giant Systems
• Inflated Eccentric Migration of Evolving Gas-Giants I: Accelerated Formation and Destruction of Hot and Warm Jupiters
• A warm super-Neptune around the G-dwarf star TOI-1710 revealed with TESS, SOPHIE and HARPS-N
• A third star in the HAT-P-7 system, and a new dynamical pathway to misaligned hot Jupiters
• ATREIDES I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system
• A tidally detached super Neptune on a strongly misaligned retrograde orbit