Confirmation of the hot super-Neptune TOI-672 b with NIRPS and HARPS and Insights into the Neptunian desert around M dwarfs

Abstract

The Neptunian desert is a distinct lack of Neptune-sized planets at short orbital periods, purportedly carved by photoevaporation and tidal circularization following high-eccentricity migration. Constraining these processes and how they vary across different host-star spectral types requires the detailed characterization of planets in the desert and around its boundaries. In this study, we confirm the planetary nature of a massive super-Neptune identified by TESS around the M0 dwarf TOI-672. We analyse photometry from TESS and ExTrA and precise radial velocity measurements taken with the recently commissioned Near-InfraRed Planet Searcher (NIRPS) and HARPS spectrographs. We measure the planetary orbital period, radius, and mass of 3.634 days, 5.31 +0.24 -0.26 Rearth, and 50.9 +4.5 -4.4 Mearth, respectively. Our findings place TOI-672 b within the Neptunian ridge, a pile-up of planets from 3--5 days at the Neptunian desert boundary. We then use a novel approach to determine the desert boundaries in period-radius space and instellation-radius space, and, for the first time, compare the Neptunian desert boundaries for planets orbiting FGK versus M dwarf stars. We determine that the boundary ridge shifts slightly inward from 3.3 +- 1.4 days for FGK host stars to 2.2 +- 1.0 days for M dwarf host stars; these values do not statistically significantly differ from each other, and the shift to shorter periods for M dwarf planets is smaller than theoretical photoevaporation models predict. We also find that TOI-672 b is a single-planet system within the sensitivity limits of our RV and TTV datasets.

arXiv comment23 pages + 8 pages appendices, 22 figures, 11 tables, data available in source files and at CDS/ExoFOP. Accepted for publication in A&A

References in corpus (116)

• Astropy: A Community Python Package for Astronomy
• The chemical composition of the Sun
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Gaia Data Release 3: Summary of the content and survey properties
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Rank-normalization, folding, and localization: An improved $\hat{R}$ for assessing convergence of MCMC
• Habitable Zones Around Main-Sequence Stars: New Estimates
• The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets
• Las Cumbres Observatory Global Telescope Network
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• The Revised TESS Input Catalog and Candidate Target List
• Planetary Radii across Five Orders of Magnitude in Mass and Stellar Insolation: Application to Transits
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
• On the radiative equilibrium of irradiated planetary atmospheres
• ESPRESSO@VLT -- On-sky performance and first results
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• Estimation of the XUV radiation onto close planets and their evaporation
• The TESS Objects of Interest Catalog from the TESS Prime Mission
• Assessing statistical significance of periodogram peaks
• How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70$M_{\odot }$
• 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
• STARRY: Analytic Occultation Light Curves
• Modern stellar spectroscopy caveats
• Atmospheric Escape and the Evolution of Close-in Exoplanets
• The Derivation, Properties and Value of Kepler's Combined Differential Photometric Precision
• Hot super-Earths stripped by their host stars
• Planetary nebulae seen with TESS: Discovery of new binary central star candidates from Cycle 1
• A Study of the Shortest-Period Planets Found With Kepler
• Kepler Data Validation II -- Transit Model Fitting and Multiple-Planet Search
• Revisited Mass-Radius relations for exoplanets below 120 Earth masses
• Photoevaporation and High-Eccentricity Migration Created the Sub-Jovian Desert
• The coronal X-ray - age relation and its implications for the evaporation of exoplanets
• A short-period censor of sub-Jupiter mass exoplanets with low density
• exoplanet: Gradient-based probabilistic inference for exoplanet data & other astronomical time series
• A Guide to Realistic Uncertainties on Fundamental Properties of Solar-Type Exoplanet Host Stars
• The CARMENES search for exoplanets around M dwarfs: Different roads to radii and masses of the target stars
• They are Small Worlds After All: Revised Properties of Kepler M Dwarf Stars and their Planets
• Magnetic activity in the HARPS M-dwarf sample. The rotation-activity relationship for very low-mass stars through R'HK
• Emerging Trends in a Period-Radius Distribution of Close-in Planets
• Bayesian search for low-mass planets around nearby M dwarfs. Estimates for occurrence rate based on global detectability statistics
• SPIRou: nIR velocimetry & spectropolarimetry at the CFHT
• Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates
• Determining the Mass of Kepler-78b With Nonparametric Gaussian Process Estimation
• Analytic Planetary Transit Light Curves and Derivatives for Stars with Polynomial Limb Darkening
• HAZMAT I: The Evolution of Far-UV and Near-UV Emission from Early M Stars
• A non-grey analytical model for irradiated atmospheres. I: Derivation
• The Kepler Dichotomy among the M Dwarfs: Half of Systems Contain Five or More Coplanar Planets
• AQUA: A Collection of H${}_2$O Equations of State for Planetary Models
• Planetary evolution with atmospheric photoevaporation I. Analytical derivation and numerical study of the evaporation valley and transition from super-Earths to sub-Neptunes
• A non-grey analytical model for irradiated atmospheres. II: Analytical vs. numerical solutions
• Line-by-line velocity measurements, an outlier-resistant method for precision velocimetry
• On the use of marginal posteriors in marginal likelihood estimation via importance-sampling
• On the origin of the sub-Jovian desert in the orbital-period--planetary-mass plane
• APERO: A PipelinE to Reduce Observations -- Demonstration with SPIRou
• The Upper Edge of the Neptune Desert Is Stable Against Photoevaporation
• HADES RV Programme with HARPS-N at TNG. VII. Rotation and activity of M-Dwarfs from time-series high-resolution spectroscopy of chromospheric indicators
• DREAM I. Orbital architecture orrery
• The sub-Neptune desert and its dependence on stellar type: Controlled by lifetime X-ray irradiation
• From super-Earths to sub-Neptunes: Observational constraints and connections to theoretical models
• Rotation rate of the solar core as a key constraint to magnetic angular momentum transport in stellar interiors
• A More Precise Mass for GJ 1214 b and the Frequency of Multi-Planet Systems Around Mid-M Dwarfs
• Quantifying the Bayesian Evidence for a Planet in Radial Velocity Data
• Chemical Abundances of M-dwarfs from the APOGEE Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186
• Why do warm Neptunes present nonzero eccentricity?
• Survival of a planet in short-period Neptunian desert under effect of photo-evaporation
• ODUSSEAS: A machine learning tool to derive effective temperature and metallicity for M dwarf stars
• Transit timing variation and transmission spectroscopy analyses of the hot Neptune GJ3470b
• Mapping the exo-Neptunian landscape. A ridge between the desert and savanna
• The JADE code: Coupling secular exoplanetary dynamics and photo-evaporation
• TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet
• Measuring Transit Signal Recovery in the Kepler Pipeline IV: Completeness of the DR25 Planet Candidate catalog
• TOI-674b: an oasis in the desert of exo-Neptunes transiting a nearby M dwarf
• ExoClock Project: An open platform for monitoring the ephemerides of Ariel targets with contributions from the public
• TOI-269 b: An eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA
• Automatic model-based telluric correction for the ESPRESSO data reduction software. Model description and application to radial velocity computation
• Removal of Hot Saturns in Mass-Radius Plane by Runaway Mass Loss
• NIRPS joining HARPS at ESO 3.6 m. On-sky performance and science objectives
• TOI-1695 b: A Water World Orbiting an Early M Dwarf in the Planet Radius Valley
• Sculpting the sub-Saturn Occurrence Rate via Atmospheric Mass Loss
• TOI-1728b: The Habitable-zone Planet Finder confirms a warm super Neptune orbiting an M dwarf host
• TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
• TOI-2196 b: Rare planet in the hot Neptune desert transiting a G-type star
• TOI-1416: A system with a super-Earth planet with a 1.07d period
• ODUSSEAS: Upgraded version with new reference scale and parameter determinations for 82 planet-host M dwarf stars in SWEET-Cat
• Elemental Abundances of the Super-Neptune WASP-107b's Host Star Using High-resolution, Near-infrared Spectroscopy
• Planet Mass and Metallicity: The Exoplanets and Solar System Connection
• A Concise Treatise on Converting Stellar Mass Fractions to Abundances to Molar Ratios
• Revisiting Kepler-444. II. Rotational, orbital and high-energy fluxes evolution of the system
• The sub-Jovian desert of exoplanets: parameter dependent boundaries and implications on planet formation
• Estimating $T_{\mathrm{eff}}$, radius and luminosity of M-dwarfs using high resolution optical and NIR spectral features
• Sub-Jovian desert of exoplanets at its boundaries. Parameter dependence along the main sequence
• TOI-3785 b: A Low-Density Neptune Orbiting an M2-Dwarf Star
• VaTEST II: Statistical Validation of 11 TESS-Detected Exoplanets Orbiting K-type Stars
• Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data
• ATREIDES I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system
• The JADE code. II. Modeling the coupled orbital and atmospheric evolution of GJ 436 b to constrain its migration and companion
• NIRPS and TESS reveal a peculiar system around the M dwarf TOI-756: A transiting sub-Neptune and a cold eccentric giant
• TOI-3288 b and TOI-4666 b: two gas giants transiting low-mass stars characterised by NIRPS
• Super-Earth masses and stellar abundances from NIRPS reveal tentative evidence for water-rich formation around M dwarfs
• K2-399 b is not a planet. The Saturn that wandered through the Neptune desert is actually a hierarchical eclipsing binary
• TOI-4552 b: A new ultra-short period rocky world revealed by NIRPS and TESS

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