A warm super-Neptune around the G-dwarf star TOI-1710 revealed with TESS, SOPHIE and HARPS-N

Abstract

We report the discovery and characterization of the transiting extrasolar planet TOI-1710b. It was first identified as a promising candidate by the Transiting Exoplanet Survey Satellite (TESS). Its planetary nature was then established with SOPHIE and HARPS-N spectroscopic observations via the radial-velocity method. The stellar parameters for the host star are derived from the spectra and a joint Markov chain Monte-Carlo (MCMC) adjustment of the spectral energy distribution and evolutionary tracks of TOI-1710. A joint MCMC analysis of the TESS light curve and the radial-velocity evolution allows us to determine the planetary system properties. From our analysis, TOI-1710b is found to be a massive warm super-Neptune ($M_{\mathrm{p}}=28.3\pm 4.7{\mathrm{M}}_{\mathrm{Earth}}$ and $R_{\mathrm{p}}=5.34\pm 0.11{\mathrm{R}}_{\mathrm{Earth}}$) orbiting a G5V dwarf star ($T_{\mathrm{eff}}=5665\pm 55\mathrm{K}$) on a nearly circular 24.3-day orbit ($e=0.16\pm 0.08$). The orbital period of this planet is close to the estimated rotation period of its host star $P_{\mathrm{rot}}=22.5\pm 2.0\mathrm{days}$ and it has a low Keplerian semi-amplitude $K=6.4\pm 1.0\mathrm{m}{\mathrm{s}}^{-1}$; we thus performed additional analyses to show the robustness of the retrieved planetary parameters. With a low bulk density of $1.03\pm 0.23\mathrm{g}\mathrm{c}{\mathrm{m}}^{-3}$ and orbiting a bright host star ($J=8.3$, $V=9.6$), TOI-1710b is one of the best targets in this mass-radius range (near the Neptunian desert) for atmospheric characterization via transmission spectroscopy, a key measurement in constraining planet formation and evolutionary models of sub-Jovian planets.

arXiv comment18 pages, 16 figures, 5 tables, A&A in press

References in corpus (91)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• The Transiting Exoplanet Survey Satellite
• 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
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• The K2 Mission: Characterization and Early results
• Accurate masses and radii of normal stars: modern results and applications
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• Las Cumbres Observatory Global Telescope Network
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• A box-fitting algorithm in the search for periodic transits
• A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
• Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• On the Unique Solution of Planet and Star Parameters from an Extrasolar Planet Transit Light Curve
• The NASA Exoplanet Archive: Data and Tools for Exoplanet Research
• The stellar activity-rotation relationship and the evolution of stellar dynamos
• The orbital motion, absolute mass, and high-altitude winds of exoplanet HD209458b
• Mass-Radius Relationships for Solid Exoplanets
• The CoRoT satellite in flight : description and performance
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• No planet for HD 166435
• EXOFAST: A fast exoplanetary fitting suite in IDL
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves (Expanded Edition)
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves
• Defining and cataloging exoplanets: The exoplanet.eu database
• Atmospheric circulation of hot Jupiters: Coupled radiative-dynamical general circulation model simulations of HD 189733b and HD 209458b
• A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
• The CORALIE survey for southern extra-solar planets VII. Two short-period Saturnian companions to HD108147 and HD168746
• Homogeneous studies of transiting extrasolar planets. IV. Thirty systems with space-based light curves
• RadVel: The Radial Velocity Modeling Toolkit
• Exoplanet Atmospheres
• HAT-P-16b: A 4 Mj Planet Transiting A Bright Star On An Eccentric Orbit
• Dearth of short-period Neptunian exoplanets - a desert in period-mass and period-radius planes
• Juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems
• High C/O Ratio and Weak Thermal Inversion in the Very Hot Atmosphere of Exoplanet WASP-12b
• Characterization of exoplanets from their formation I: Models of combined planet formation and evolution
• Kepler Data Validation I -- Architecture, Diagnostic Tests, and Data Products for Vetting Transiting Planet Candidates
• Transmission Spectra of Three-Dimensional Hot Jupiter Model Atmospheres
• SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs I. New atmospheric parameters and masses for 48 stars with planets
• Chemical consequences of the C/O ratio on hot Jupiters: Examples from WASP-12b,CoRoT-2b, XO-1b, and HD 189733b
• Ground-based detection of an extended helium atmosphere in the Saturn-mass exoplanet WASP-69b
• Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
• Atmospheric Escape from Hot Jupiters
• A diagram for the evaporation status of extrasolar planets
• Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler
• A Detailed Model Grid for Solid Planets from 0.1 through 100 Earth Masses
• Kepler Data Validation II -- Transit Model Fitting and Multiple-Planet Search
• Spectrally resolved helium absorption from the extended atmosphere of a warm Neptune-mass exoplanet
• Inferring probabilistic stellar rotation periods using Gaussian processes
• ARES v2 - new features and improved performance
• A short-period censor of sub-Jupiter mass exoplanets with low density
• Exoplanetary Atmospheres - Chemistry, Formation Conditions, and Habitability
• Occurrence Rates of Planets orbiting FGK Stars: Combining Kepler DR25, Gaia DR2 and Bayesian Inference
• Measuring precise radial velocities on individual spectral lines. I. Validation of the method and application to mitigate stellar activity
• Simultaneous Detection of Water, Methane and Carbon Monoxide in the Atmosphere of Exoplanet HR8799b
• An evaporating planet in the wind: stellar wind interactions with the radiatively braked exosphere of GJ436 b
• Ab initio equations of state for hydrogen (H-REOS.3) and helium (He-REOS.3) and their implications for the interior of Brown Dwarfs
• Observations of Exoplanet Atmospheres
• SOPHIE+: First results of an octagonal-section fiber for high-precision radial velocity measurements
• Accounting for velocity jitter in planet search surveys
• The SOPHIE search for northern extrasolar planets III. A Jupiter-mass companion around HD 109246
• EXOFASTv2: A public, generalized, publication-quality exoplanet modeling code
• SWEET-Cat 2.0: The Cat just got SWEETer; Higher quality spectra and precise parallaxes from GAIA eDR3
• Uranus and Neptune: Origin, Evolution and Internal Structure
• The Formation of Jupiter's Diluted Core by a Giant Impact
• Highlights in the Study of Exoplanet Atmospheres
• Microlensing Results Challenge the Core Accretion Runaway Growth Scenario for Gas Giants
• CoRoT-10b: a giant planet in a 13.24 day eccentric orbit
• An Ultra-Hot Neptune in the Neptune desert
• The SOPHIE search for northern extrasolar planets VIII. A warm Neptune orbiting HD164595
• Detection of ionized calcium in the atmosphere of the ultra-hot Jupiter KELT-9b
• Wind of Change: retrieving exoplanet atmospheric winds from high-resolution spectroscopy
• Consequences of Giant Impacts on Early Uranus for Rotation, Internal Structure, Debris, and Atmospheric Erosion
• ACTIN: A tool to calculate stellar activity indices
• A Systematic Retrieval Analysis of Secondary Eclipse Spectra III: Diagnosing Chemical Disequilibrium in Planetary Atmospheres
• Improved parameters of seven Kepler giant companions characterized with SOPHIE and HARPS-N
• TOI-257b (HD 19916b): A Warm sub-Saturn Orbiting an Evolved F-type Star
• Improving transit characterisation with Gaussian process modelling of stellar variability
• New Perspectives on the Exoplanet Radius Gap from a Mathematica Tool and Visualized Water Equation of State
• The GAPS Programme at TNG XXVIII -- A pair of hot-Neptunes orbiting the young star TOI-942
• Detection of Ionized Calcium in the Atmosphere of the Ultra-Hot Jupiter WASP-76b
• Know the Planet, Know the Star: Precise Stellar Densities from Kepler Transit Light Curves
• Characterization of the four new transiting planets KOI-188b, KOI-195b, KOI-192b, and KOI-830b
• The SOPHIE search for northern extrasolar planets XV. A Warm Neptune around the M-dwarf Gl378
• Resolving period aliases for TESS monotransits recovered during the extended mission
• Moderately misaligned orbit of the warm sub-Saturn HD 332231 b
• K2-79b and K2-222b: Mass measurements of two small exoplanets with periods beyond 10 days that overlap with periodic magnetic activity signals
• Modeling Exoplanetary Atmospheres: An Overview

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• TOI-5678 b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS
• Hundreds of TESS exoplanets might be larger than we thought
• VaTEST I: Validation of Sub-Saturn Exoplanet TOI-181b in Narrow Orbit from its Host Star
• TOI-1736 and TOI-2141: two systems including sub-Neptunes around solar analogs revealed by TESS and SOPHIE
• Characterization of seven transiting systems including four warm Jupiters from SOPHIE and TESS
• TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS and SOPHIE
• A tidally detached super Neptune on a strongly misaligned retrograde orbit
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• POSEIDON II: The Anti-Aligned Orbit of the Warm Neptune TOI-1710 A b