An old warm Jupiter orbiting the metal-poor G-dwarf TOI-5542

Abstract

We report the discovery of a 1.32${}_{-0.10}^{+0.10}$ ${\mathrm{M}}_{\mathrm{Jup}}$ planet orbiting on a 75.12 day period around the G3V $10.8_{-3.6}^{+2.1}$ Gyr old star TOI-5542 (TIC 466206508; TYC 9086-1210-1). The planet was first detected by the Transiting Exoplanet Survey Satellite (TESS) as a single transit event in TESS Sector 13. A second transit was observed 376 days later in TESS Sector 27. The planetary nature of the object has been confirmed by ground-based spectroscopic and radial velocity observations from the CORALIE and HARPS spectrographs. A third transit event was detected by the ground-based facilities NGTS, EulerCam, and SAAO. We find the planet has a radius of 1.009${}_{-0.035}^{+0.036}$ ${\mathrm{R}}_{\mathrm{Jup}}$ and an insolation of 9.6${}_{-0.8}^{+0.9}$ $S_{\oplus }$, along with a circular orbit that most likely formed via disk migration or in situ formation, rather than high-eccentricity migration mechanisms. Our analysis of the HARPS spectra yields a host star metallicity of [Fe/H] = $-$0.21$\pm$0.08, which does not follow the traditional trend of high host star metallicity for giant planets and does not bolster studies suggesting a difference among low- and high-mass giant planet host star metallicities. Additionally, when analyzing a sample of 216 well-characterized giant planets, we find that both high masses (4 ${\mathrm{M}}_{\mathrm{Jup}}$ $<M_p<$ 13 ${\mathrm{M}}_{\mathrm{Jup}}$) and low masses (0.5 ${\mathrm{M}}_{\mathrm{Jup}}$ $<M_p<$ 4 ${\mathrm{M}}_{\mathrm{Jup}}$), as well as both both warm (P $>$ 10 days) and hot (P $<$ 10 days) giant planets are preferentially located around metal-rich stars (mean [Fe/H] $>$ 0.1). TOI-5542b is one of the oldest known warm Jupiters and it is cool enough to be unaffected by inflation due to stellar incident flux, making it a valuable contribution in the context of planetary composition and formation studies.

arXiv comment16 pages, 12 figures, Accepted by Astronomy & Astrophysics September 19, 2022

References in corpus (83)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The chemical composition of the Sun
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Transiting Exoplanet Survey Satellite
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• batman: BAsic Transit Model cAlculatioN in Python
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation
• Towards Better Age Estimates for Stellar Populations: The Y^2 Isochrones for Solar Mixture
• A map of the day-night contrast of the extrasolar planet HD 189733b
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• EXOFAST: A fast exoplanetary fitting suite in IDL
• Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
• Planet Migration and Binary Companions: the case of HD 80606b
• Origins of Hot Jupiters
• Hot Jupiters from Secular Planet--Planet Interactions
• RadVel: The Radial Velocity Modeling Toolkit
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• Improving the Efficiency of Markov Chain Monte Carlo for Analyzing the Orbits of Extrasolar Planets
• Accurate, Empirical Radii and Masses of Planets and their Host Stars with Gaia Parallaxes
• The Mass-Metallicity Relation for Giant Planets
• Secular Chaos and the Production of Hot Jupiters
• Evolution of "51Peg b-like" Planets
• Models of the in situ formation of detected extrasolar giant planets
• Juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems
• Improved spectroscopic parameters for transiting planet hosts
• Atmospheres of protoplanetary cores: critical mass for nucleated instability
• Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
• A Gaussian process framework for modelling instrumental systematics: application to transmission spectroscopy
• The Next Generation Transit Survey (NGTS)
• Limb darkening and exoplanets: testing stellar model atmospheres and identifying biases in transit parameters
• In Situ Formation and Dynamical Evolution of Hot Jupiter Systems
• Planetary nebulae seen with TESS: Discovery of new binary central star candidates from Cycle 1
• The Heavy Element Masses of Extrasolar Giant Planets, Revealed
• Lack of Inflated Radii for Kepler Giant Planet Candidates Receiving Modest Stellar Irradiation
• Revisited Mass-Radius relations for exoplanets below 120 Earth masses
• Eclipsing Binary Stars as Benchmarks for Trigonometric Parallaxes in the Gaia Era
• Warm Jupiters are less lonely than hot Jupiters: close neighbours
• A Guide to Realistic Uncertainties on Fundamental Properties of Solar-Type Exoplanet Host Stars
• The Mass-Radius(-Rotation?) Relation for Low-Mass Stars
• Statistical properties of exoplanets. I. The period distribution: constraints for the migration scenario
• Accuracy and precision of industrial stellar abundances
• Empirical, Accurate Masses and Radii of Single Stars with TESS and Gaia
• Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars
• Evidence of an Upper Bound on the Masses of Planets and its Implications for Giant Planet Formation
• Orbital misalignment of the Neptune-mass exoplanet GJ 436b with the spin of its cool star
• Warm Jupiters from secular planet-planet interactions
• WASP-42 b and WASP-49 b: two new transiting sub-Jupiters
• The In Situ Formation of Giant Planets at Short Orbital Periods
• Two new HATNet hot Jupiters around A stars, and the first glimpse at the occurrence rate of hot Jupiters from TESS
• Highly inclined and eccentric massive planets I: Planet-disc interactions
• Observational evidence for two distinct giant planet populations
• A limit on eccentricity growth from global 3-D simulations of disc-planet interactions
• The Eccentricity-Mass Distribution of Exoplanets: Signatures of Different Formation Mechanisms?
• Heavy metal rules. I. Exoplanet incidence and metallicity
• NGTS-4b: A sub-Neptune Transiting in the Desert
• Reliable inference of exoplanet light curve parameters using deterministic and stochastic systematics models
• Bayesian priors for the eccentricity of transiting planets
• Constraining the magnetic field structure in collisionless relativistic shocks with a radio afterglow polarization upper limit in GW170817
• kima: Exoplanet detection in radial velocities
• Simultaneous TESS and NGTS Transit Observations of WASP-166b
• Connecting substellar and stellar formation. The role of the host star's metallicity
• TOI-222: a single-transit TESS candidate revealed to be a 34-day eclipsing binary with CORALIE, EulerCam and NGTS
• NGTS-11 b / TOI-1847 b: A transiting warm Saturn recovered from a TESS single-transit event
• The JADE code: Coupling secular exoplanetary dynamics and photo-evaporation
• Close-in sub-Neptunes reveal the past rotation history of their host stars: atmospheric evolution of planets in the HD3167 and K2-32 planetary systems
• The Kepler-11 system: evolution of the stellar high-energy emission and {initial planetary} atmospheric mass fractions
• The Frequency of Low-Mass Exoplanets. II. The `Period Valley'
• qpower2 - a fast and accurate algorithm for the computation of exoplanet transit light curves with the power-2 limb-darkening law
• Two long-period transiting exoplanets on eccentric orbits: NGTS-20 b (TOI-5152 b) and TOI-5153 b
• NGTS-19b : A high mass transiting brown dwarf in a 17-day eccentric orbit
• A long period (P = 61.8-d) M5V dwarf eclipsing a Sun-like star from TESS and NGTS
• NGTS-14Ab: a Neptune-sized transiting planet in the desert
• Multiple Populations of Extrasolar Gas Giants
• TIC-320687387 B: a long-period eclipsing M-dwarf close to the hydrogen burning limit

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• Hundreds of TESS exoplanets might be larger than we thought
• Two neighbours of the ultra-short-period Earth-sized planet K2-157 b in the warm Neptunian savanna
• Exoplanet Transit Candidate Identification in TESS Full-Frame Images via a Transformer-Based Algorithm