The GAPS Programme at TNG. LIX. A characterisation study of the $\sim$300 Myr old multi-planetary system orbiting the star BD+40 2790 (TOI-2076)

Abstract

We collected more than 300 high-resolution spectra of the 300 Myr old star BD+40 2790 (TOI-2076) over ~3 years. This star hosts three transiting planets discovered by TESS, with orbital periods ~10, 21, and 35 days. BD+40 2790 shows an activity-induced scatter larger than 30 m/s in the radial velocities. We employed different methods to measure the stellar radial velocities and several models to filter out the dominant stellar activity signal, in order to bring to light the planet-induced signals which are expected to have semi-amplitudes one order of magnitude lower. We evaluated the mass loss rate of the planetary atmospheres using photoionization hydrodynamic modeling. The dynamical analysis confirms that the three sub-Neptune-sized companions (our radius measurements are $R_b$=2.54$\pm$0.04, $R_c$=3.35$\pm$0.05, and $R_d$=3.29$\pm$0.06 $R_{\mathrm{Earth}}$) have masses in the planetary regime. We derive 3$\sigma$ upper limits below or close to the mass of Neptune for all the planets: 11--12, 12--13.5, and 14--19 $M_{\mathrm{Earth}}$ for planet $b$, $c$, and $d$ respectively. In the case of planet $d$, we found promising clues that the mass could be between ~7 and 8 $M_{\mathrm{Earth}}$, with a significance level between 2.3--2.5$\sigma$ (at best). This result must be further investigated using other analysis methods or using high-precision near-IR spectrographs to collect new radial velocities, which could be less affected by stellar activity. Atmospheric photo-evaporation simulations predict that BD+40~2790 b is currently losing its H-He gaseous envelope, which will be completely lost at an age within 0.5--3 Gyr if its current mass is lower than 12 $M_{\mathrm{Earth}}$. BD+40 2790 c could have a lower bulk density than $b$, and it could retain its atmosphere up to an age of 5 Gyr. For the outermost planet $d$, we predict almost negligible evolution of its mass and radius induced by photo-evaporation.

Accepted for publication on A&A. Abstract abridged

References in corpus (69)

• The Gaia mission
• Gaia Data Release 3: Summary of the content and survey properties
• The Transiting Exoplanet Survey Satellite
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Dynamical Outcomes of Planet-Planet Scattering
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
• Roche lobe effects on the atmospheric loss of "Hot Jupiters"
• Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators
• Tidal Evolution of Close-in Extra-Solar Planets
• The first WASP public data release
• Migration and the formation of systems of hot super-Earths and Neptunes
• Improving Stellar and Planetary Parameters of Transiting Planet Systems: The Case of TrES-2
• The active lives of stars: a complete description of rotation and XUV evolution of F, G, K, and M dwarfs
• ARES v2 - new features and improved performance
• SPIRou: nIR velocimetry & spectropolarimetry at the CFHT
• Kepler Multi-Planet Systems Exhibit Unexpected Intra-system Uniformity in Mass and Radius
• Hot super-Earths and giant planet cores from different migration histories
• Line-by-line velocity measurements, an outlier-resistant method for precision velocimetry
• pyaneti II: A multidimensional Gaussian process approach to analysing spectroscopic time-series
• The GALAH survey: effective temperature calibration from the InfraRed Flux Method in the Gaia system
• A Young Planet Search in Visible and IR Light: DN Tau, V836 Tau, and V827 Tau
• The all-sky PLATO input catalogue
• Diving Beneath the Sea of Stellar Activity: Chromatic Radial Velocities of the Young AU Mic Planetary System
• Detection of Atmospheric Escape from Four Young Mini Neptunes
• The Gaia-ESO Survey: a new approach to chemically characterising young open clusters
• How magnetic activity alters what we learn from stellar spectra
• TRADES: A new software to derive orbital parameters from observed transit times and radial velocities. Revisiting Kepler-11 and Kepler-9
• The GAPS Programme at TNG XXI -- A GIARPS case-study of known young planetary candidates: confirmation of HD 285507 b and refutation of AD Leo b
• Architectures of Compact Super-Earth Systems Shaped by Instabilities
• Irradiation-driven escape of primordial planetary atmospheres II. Evaporation efficiency of sub-Neptunes through hot Jupiters
• The GAPS Programme with HARPS-N at TNG. XXXV. Fundamental properties of transiting exoplanet host stars
• The effect of stellar activity on the spectroscopic stellar parameters of the young solar twin HIP 36515
• An Analytic Criterion for Turbulent Disruption of Planetary Resonances
• Irradiation-driven escape of primordial planetary atmospheres I. The ATES photoionization hydrodynamics code
• The young HD 73583 (TOI-560) planetary system: Two 10-M${}_{\oplus }$ mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf
• The GAPS Programme with HARPS-N at TNG. XXXVII. A precise density measurement of the young ultra-short period planet TOI-1807 b
• TOI-2076 and TOI-1807: Two young, comoving planetary systems within 50 pc identified by TESS that are ideal candidates for further follow-up
• Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076
• Toward Extremely Precise Radial Velocities: II. A Tool For Using Multivariate Gaussian Processes to Model Stellar Activity
• Energy Optimization in Extrasolar Planetary Systems: The Transition from Peas-in-a-Pod to Runaway Growth
• The GAPS Programme at TNG XXVIII -- A pair of hot-Neptunes orbiting the young star TOI-942
• Sub-Neptune Formation: The View from Resonant Planets
• Terrestrial planet formation by torque-driven convergent migration of planetary embryos
• Masses for the seven planets in K2-32 and K2-233. Four diverse planets in resonant chain and the first young rocky worlds
• Radial velocity photon limits for the dwarf stars of spectral classes F--M
• A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- IV. Candidate exoplanets around stars in open clusters: frequency and age-planetary radius distribution
• Validation of TESS exoplanet candidates orbiting solar analogues in the all-sky PLATO input catalogue
• Photo-evaporation of close-in gas giants orbiting around G and M stars
• Intra-system uniformity: a natural outcome of dynamical sculpting
• New constraints on the future evaporation of the young exoplanets in the V1298 Tau system
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• Revisiting K2-233 spectroscopic time-series with multidimensional Gaussian Processes
• Dynamics and Origins of the Near-Resonant Kepler Planets
• Chains of Planets in Mean Motion Resonances Arising from Oligarchic Growth
• Planet(esimal)s Around Stars with TESS (PAST) III: A Search for Triplet He I in the Atmospheres of Two 200 Myr-old Planets
• Generalized Peas-in-a-Pod: Extending Intra-System Mass Uniformity to Non-TTV Systems via the Gini Index
• The GAPS Programme at TNG XLII. A characterisation study of the multi-planet system around the 400 Myr-old star HD 63433 (TOI-1726)
• Exciting the TTV Phases of Resonant Sub-Neptunes
• The GAPS program at TNG XLVII: The unusual formation history of V1298 Tau
• RVSPY -- Radial Velocity Survey for Planets around Young Stars. Target characterization and high-cadence survey
• NEID Reveals that The Young Warm Neptune TOI-2076 b Has a Low Obliquity
• The GAPS programme at TNG XLIV. Projected rotational velocities of 273 exoplanet-host stars observed with HARPS-N
• Enhanced Size Uniformity for Near-resonant Planets
• Dynamical masses of two young transiting sub-Neptunes orbiting HD 63433
• Energy Optimization in Binary Star Systems: Explanation for Equal Mass Members in Close Orbits
• Discovering planets with PLATO: Comparison of algorithms for stellar activity filtering

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