L 363-38 b: a planet newly discovered with ESPRESSO orbiting a nearby M dwarf star

Abstract

Context. Planets around stars in the solar neighbourhood will be prime targets for characterisation with upcoming large space- and ground-based facilities. Since large-scale exoplanet searches will not be feasible with such telescopes, it is crucial to use currently available data and instruments to find possible target planets before next generation facilities come online. Aims. We aim at detecting new extrasolar planets around stars in the solar neighbourhood by blind radial velocity (RV) search with ESPRESSO. Our target sample consist of nearby stars (d < 11 pc) with little (< 10) or no previous RV measurements. Methods. We use 31 radial velocity measurements obtained with ESPRESSO at the VLT between December 2020 and February 2022 of the nearby M dwarf star (M_star = 0.21 M_sun, d = 10.23 pc) L 363-38 to derive the orbital parameters of the newly discovered planet. In addition, we use TESS photometry and archival VLT/NaCo high contrast imaging data to put further constraints on the orbit inclination and the possible planetary system architecture around L 363-38. Results. We present the detection of a new extrasolar planet orbiting the nearby M dwarf star L 363-38. L 363-38 b is a planet with minimum mass mp sin(i) = 4.67+/-0.43 M_Earth orbiting its star with a period P = 8.781+/-0.007 d, corresponding to a semi-major axis a = 0.048+/-0.006 AU, which is well inside the inner edge of the habitable zone. We further estimate a minimum radius rp sin(i) = 1.55 - 2.75 R_Earth and an equilibrium temperature Teq = 330K.

12 pages, 11 figures

References in corpus (52)

• The Gaia mission
• The Transiting Exoplanet Survey Satellite
• The James Webb Space Telescope
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• ESPRESSO@VLT -- On-sky performance and first results
• Trumpeting M Dwarfs with CONCH-SHELL: a Catalog of Nearby Cool Host-Stars for Habitable ExopLanets and Life
• Planetary nebulae seen with TESS: Discovery of new binary central star candidates from Cycle 1
• Transit Least Squares: Optimized transit detection algorithm to search for periodic transits of small planets
• Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b
• Revisited Mass-Radius relations for exoplanets below 120 Earth masses
• Tidal Locking of Habitable Exoplanets
• A decreased probability of habitable planet formation around low-mass stars
• PASTIS: Bayesian extrasolar planet validation. I. General framework, models, and performance
• Large Interferometer For Exoplanets (LIFE): I. Improved exoplanet detection yield estimates for a large mid-infrared space-interferometer mission
• Six transiting planets and a chain of Laplace resonances in TOI-178
• Gaia Data Release 3: Catalogue Validation
• Evolution of the radius valley around low mass stars from $Kepler$ and $K2$
• HST/NICMOS detection of HR 8799 b in 1998
• MIRACLES: atmospheric characterization of directly imaged planets and substellar companions at 4-5 $\mu$m. I. Photometric analysis of $\beta$ Pic b, HIP 65426 b, PZ Tel B and HD 206893 B
• A candidate short-period sub-Earth orbiting Proxima Centauri
• The HARPS search for southern extra-solar planets XXXV. The interesting case of HD41248: stellar activity, no planets?
• Revisiting Proxima with ESPRESSO
• Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 $R_{\oplus }$
• Occurrence Rates of Planets Orbiting M Stars: Applying ABC to Kepler DR25, Gaia DR2, and 2MASS Data
• Direct detection of exoplanets in the 3 -- 10 micron range with E-ELT/METIS
• Formation and composition of planets around very low mass stars
• Disentangling Planets and Stellar Activity for Gliese 667C
• HADES RV Programme with HARPS-N at TNG XII. The abundance signature of M dwarf stars with planets
• A precise architecture characterization of the $\pi$ Men planetary system
• Large Interferometer For Exoplanets (LIFE): V. Diagnostic potential of a mid-infrared space-interferometer for studying Earth analogs
• Large Interferometer For Exoplanets (LIFE): III. Spectral resolution, wavelength range and sensitivity requirements based on atmospheric retrieval analyses of an exo-Earth
• HAZMAT VI: The Evolution of Extreme Ultraviolet Radiation Emitted from Early M Star
• Large Interferometer For Exoplanets (LIFE): II. Signal simulation, signal extraction and fundamental exoplanet parameters from single epoch observations
• Efficient modeling of correlated noise II. A flexible noise model with fast and scalable methods
• Efficient modeling of correlated noise. III. Scalable methods for jointly modeling several observables' time series with Gaussian processes
• K2-111: an old system with two planets in near-resonance
• The Volume-Complete Sample of M Dwarfs with Masses 0.1 <= M/M_sol <= 0.3 within 15 Parsecs
• HATS-74Ab, HATS-75b, HATS-76b and HATS-77b: Four Transiting Giant Planets around K and M Dwarfs
• Decoding the radial velocity variations of HD41248 with ESPRESSO
• CHES: a space-borne astrometric mission for the detection of habitable planets of the nearby solar-type stars
• Efficient modeling of correlated noise I. Statistical significance of periodogram peaks
• Characterization of the K2-38 planetary system. Unraveling one of the densest planets known to date
• A sub-Neptune and a non-transiting Neptune-mass companion unveiled by ESPRESSO around the bright late-F dwarf HD 5278 (TOI-130)
• Co-orbital exoplanets from close period candidates: The TOI-178 case
• A Fast, 2D Gaussian Process Method Based on Celerite: Applications to Transiting Exoplanet Discovery and Characterization
• The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and their Orbital Architectures
• NEMESIS: Exoplanet Transit Survey of Nearby M-Dwarfs in TESS FFIs I
• HD22496b: the first ESPRESSO standalone planet discovery
• Atmospheric Characterization of Hot Jupiter CoRoT-1 b Using the Wide Field Camera 3 on the Hubble Space Telescope
• In Situ Models for Planet Assembly around Cool stars
• Combining high contrast imaging and radial velocities to constrain the planetary architecture of nearby stars