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

Abstract

Warm Jupiters are close-in giant planets with relatively large planet-star separations (i.e., $10<a/R_{\star }<100$). 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 $\lambda =38.9_{-2.7}^{+2.8}°$ 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.

15 pages, 7 figures, 1 table; accepted to ApJL

References in corpus (24)

• Array Programming with NumPy
• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 3: Summary of the content and survey properties
• The Transiting Exoplanet Survey Satellite
• Dynamical Outcomes of Planet-Planet Scattering
• EXOFAST: A fast exoplanetary fitting suite in IDL
• Formation of Hot Planets by a combination of planet scattering, tidal circularization, and Kozai mechanism
• 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
• Tidal dissipation in stars and giant planets
• Three regimes of extrasolar planets inferred from host star metallicities
• exoplanet: Gradient-based probabilistic inference for exoplanet data & other astronomical time series
• Steady-state planet migration by the Kozai-Lidov mechanism in stellar binaries
• ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
• A comprehensive radial velocity error budget for next generation Doppler spectrometers
• A Versatile Technique to Enable sub-milli-Kelvin Instrument Stability for Precise Radial Velocity Measurements: Tests with the Habitable-zone Planet Finder
• Chaotic Tides in Migrating Gas Giants: Forming Hot and Transient Warm Jupiters via High-Eccentricity Migration
• Origins of Hot Jupiters from the Stellar Obliquity Distribution
• Evidence for Hidden Nearby Companions to Hot Jupiters
• A Tendency Toward Alignment in Single-Star Warm Jupiter Systems
• Formation of Hot Jupiters through Secular Chaos and Dynamical Tides
• The Aligned Orbit of the Eccentric Warm Jupiter K2-232b
• NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star
• The Orbital Architecture of Qatar-6: A Fully Aligned 3-Body System?

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