The SPIRou Legacy Survey: Detection of a nearby world orbiting in the habitable zone of Gl725B achieved by correcting strong telluric contamination in near-infrared radial velocities with WAPITI

Abstract

M dwarfs are prime targets in the search for exoplanets because of their prevalence and because low-mass planets can be better detected with radial velocity (RV) methods. In particular, the near-infrared (NIR) spectral domain offers an increased RV sensitivity and potentially reduced stellar activity signals. Howevern precise NIR RV measurements can be strongly affected by telluric absorption lines from the Earth's atmosphere. We searched for planets orbiting Gl 725 B, a nearby late-M dwarf at $3.5$ pc, using high-precision SPIRou RV observations. We assessed the impact of telluric contamination and evaluated the performance of the weighted principal component analysis reconstruction method (WAPITI), designed to mitigate these systematics and improve planet detectability. Using synthetic and observational SPIRou data, we simulated telluric effects on RVs under varying barycentric Earth radial velocity (BERV) conditions and applied WAPITI to correct line-by-line RVs. The method was tested through injection-recovery experiments and applied to real SPIRou observations of Gl 725 B. WAPITI efficiently corrects telluric contamination in simulated and real datasets, enhancing the detectability and accuracy of planetary signals. We identify a two-planet system around Gl 725 B composed of a candidate inner planet (Gl 725 Bb) with a period of $4.765\pm 0.004$ days and semi-amplitude $1.4\pm 0.3$ m.s${}^{-1}$, and a confirmed outer planet (Gl 725 Bc) with a period of $37.90\pm 0.17$ days and semi-amplitude $1.7\pm 0.3$ m.s${}^{-1}$. Their minimum masses are $1.5\pm 0.4$ and $3.5\pm 0.7$ M${}_{\oplus }$, respectively, and the outer planet lies in the habitable zone. Using a multi-dimensional Gaussian process framework to model stellar activity, we also recover a stellar rotation period of $105.1\pm 3.3$ days.

arXiv commentPublished in A&A

References in corpus (81)

• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets
• A terrestrial planet candidate in a temperate orbit around Proxima Centauri
• batman: BAsic Transit Model cAlculatioN in Python
• A box-fitting algorithm in the search for periodic transits
• Long-Term Stability of Planets in Binary Systems
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample
• Stellar Diameters and Temperatures II. Main Sequence K & M Stars
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
• Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators
• A Gaussian process framework for modelling stellar activity signals in radial velocity data
• Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly
• Assessing statistical significance of periodogram peaks
• State of the Field: Extreme Precision Radial Velocities
• Limb and gravity-darkening coefficients for the TESS satellite at several metallicities, surface gravities, and microturbulent velocities
• A simple method to estimate radial velocity variations due to stellar activity using photometry
• Planetary detection limits taking into account stellar noise. I. Observational strategies to reduce stellar oscillation and granulation effects
• The Role of Multiplicity in Disk Evolution and Planet Formation
• SOAP 2.0: A tool to estimate the photometric and radial velocity variations induced by stellar spots and plages
• Strong Dependence of the Inner Edge of the Habitable Zone on Planetary Rotation Rate
• Transit Least Squares: Optimized transit detection algorithm to search for periodic transits of small planets
• Revisited Mass-Radius relations for exoplanets below 120 Earth masses
• TW Hydrae: evidence of stellar spots instead of a Hot Jupiter
• Wotan: Comprehensive time-series de-trending in Python
• Gliese 581d is the first discovered terrestrial-mass exoplanet in the habitable zone
• High-cadence spectroscopy of M-dwarfs. I. Analysis of systematic effects in HARPS-N line profile measurements on the bright binary GJ 725A+B
• Habitable Moist Atmospheres On Terrestrial Planets Near the Inner Edge Of the Habitable Zone Around M-dwarfs
• Modelling climate diversity, tidal dynamics and the fate of volatiles on TRAPPIST-1 planets
• They are Small Worlds After All: Revised Properties of Kepler M Dwarf Stars and their Planets
• CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS
• Measuring precise radial velocities on individual spectral lines. I. Validation of the method and application to mitigate stellar activity
• Atmospheric characterization of Proxima b by coupling the Sphere high-contrast imager to the Espresso spectrograph
• SPIRou: nIR velocimetry & spectropolarimetry at the CFHT
• Evolution of the radius valley around low mass stars from $Kepler$ and $K2$
• The CRIRES Search for Planets Around the Lowest-Mass Stars. I. High-Precision Near-Infrared Radial Velocities with an Ammonia Gas Cell
• The CARMENES search for exoplanets around M dwarfs -- Planet occurrence rates from a subsample of 71 stars
• A candidate short-period sub-Earth orbiting Proxima Centauri
• A Volcanic Hydrogen Habitable Zone
• Line-by-line velocity measurements, an outlier-resistant method for precision velocimetry
• Occurrence Rates of Planets Orbiting M Stars: Applying ABC to Kepler DR25, Gaia DR2, and 2MASS Data
• Separating planetary reflex Doppler shifts from stellar variability in the wavelength domain
• Weighted principal component analysis: a weighted covariance eigendecomposition approach
• On the use of marginal posteriors in marginal likelihood estimation via importance-sampling
• APERO: A PipelinE to Reduce Observations -- Demonstration with SPIRou
• CRIRES${}^{+}$ on sky at the ESO Very Large Telescope
• The magnetic field and multiple planets of the young dwarf AU~Mic
• A Search for Giant Planet Companions to T Tauri Stars
• Diving Beneath the Sea of Stellar Activity: Chromatic Radial Velocities of the Young AU Mic Planetary System
• Differences in water vapor radiative transfer among 1D models can significantly affect the inner edge of the habitable zone
• Towards Understanding Stellar Radial Velocity Jitter as a Function of Wavelength: The Sun as a Proxy
• The HARPS search for southern extra-solar planets. XLIII. A compact system of four super-Earth planets orbiting HD 215152
• Starspot-induced optical and infrared radial velocity variability in T Tauri star Hubble 4
• Precision radial velocity measurements by the forward-modeling technique in the near-infrared
• The CARMENES search for exoplanets around M dwarfs. Measuring precise radial velocities in the near infrared: the example of the super-Earth CD Cet b
• A Methane Extension to the Classical Habitable Zone
• A 4 Gyr M-dwarf Gyrochrone from CFHT/MegaPrime Monitoring of the Open Cluster M67
• Two temperate Earth-mass planets orbiting the nearby star GJ1002
• Efficient modeling of correlated noise. III. Scalable methods for jointly modeling several observables' time series with Gaussian processes
• Stellar Surface Magneto-Convection as a Source of Astrophysical Noise III. Sun-as-a-star Simulations and Optimal Noise Diagnostics
• A framework for the architecture of exoplanetary systems. I. Four classes of planetary system architecture
• Persistent starspot signals on M dwarfs: multi-wavelength Doppler observations with the Habitable-zone Planet Finder and Keck/HIRES
• YARARA V2: Reaching sub m/s precision over a decade using PCA on line-by-line RVs
• Improving exoplanet detection capabilities with the false inclusion probability. Comparison with other detection criteria in the context of radial velocities
• The SPIRou Legacy Survey Rotation period of quiet M dwarfs from circular polarization in near-infrared spectral lines: I. The SPIRou APERO analysis
• Water Condensation Zones around Main Sequence Stars
• Estimating the atmospheric properties of 44 M dwarfs from SPIRou spectra
• The TIME Table: Rotation and Ages of Cool Exoplanet Host Stars
• Telluric correction in the near-infrared: Standard star or synthetic transmission?
• Correction of near-infrared high-resolution spectra for telluric absorption at 0.90-1.35 microns
• 'Modal-noise' in single-mode fibers: A cautionary note for high precision radial velocity instruments
• High precision radial velocities with GIANO spectra
• Optical and near-infrared stellar activity characterization of the early M dwarf Gl~205 with SOPHIE and SPIRou
• $\text{Wapiti}$: a data-driven approach to correct for systematics in RV data -- Application to SPIRou data of the planet-hosting M dwarf GJ 251
• Evidence from stellar rotation for early disc dispersal owing to close companions
• How does the background atmosphere affect the onset of the runaway greenhouse ?
• Gl 725A b: a potential super-Earth detected with SOPHIE and SPIRou in an M dwarf binary system at 3.5 pc
• Chromaticity of stellar activity in radial velocities : Anti-correlated families of lines on the M dwarf EV Lac with SPIRou and SOPHIE
• The SPIRou Legacy Survey: near-infrared and optical radial velocity analysis of Gl 480 and Gl 382 using SPIRou, HARPS and CARMENES spectrographs