Radial Velocity Survey for Planets around Young stars (RVSPY) A transiting warm super-Jovian planet around HD 114082, a young star with a debris disk

Abstract

Aiming to detect planetary companions to young stars with debris disks via the radial velocity method, we observed HD114082 during April 2018 - August 2022 as one of the targets of our RVSPY program (Radial Velocity Survey for Planets around Young stars). We used the FEROS spectrograph, mounted to the MPG/ESO 2.2 m telescope in Chile, to obtain high signal-to-noise spectra and time series of precise radial velocities (RVs). Additionally, we analyzed archival HARPS spectra and TESS photometric data. We used the CERES, CERES++ and SERVAL pipelines to derive RVs and activity indicators and ExoStriker for the independent and combined analysis of the RVs and TESS photometry. We report the discovery of a warm super-Jovian companion around HD114082 based on a 109.8$\pm$0.4 day signal in the combined RV data from FEROS and HARPS, and on one transit event in the TESS photometry. The best-fit model indicates a 8.0$\pm$1.0 Mjup companion with a radius of 1.00$\pm$0.03 Rjup in an orbit with a semi-major axis of 0.51$\pm$0.01 au and an eccentricity of 0.4$\pm$0.04. The companions orbit is in agreement with the known near edge-on debris disk located at about 28 au. HD114082b is possibly the youngest (15$\pm$6 Myr), and one of only three younger than 100 Myr giant planetary companions for which both their mass and radius have been determined observationally. It is probably the first properly model-constraining giant planet that allows distinguishing between hot and cold-start models. It is significantly more compatible with the cold-start model.

arXiv comment10 pages, 9 figures, 5 tables; Accepted for publication in A&A Letters

References in corpus (36)

• The Gaia mission
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• Bayes in the sky: Bayesian inference and model selection in cosmology
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• No planet for HD 166435
• Defining and cataloging exoplanets: The exoplanet.eu database
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly
• Assessing statistical significance of periodogram peaks
• Planetary nebulae seen with TESS: Discovery of new binary central star candidates from Cycle 1
• Synthetic Spectra and Colors of Young Giant Planet Atmospheres: Effects of Initial Conditions and Atmospheric Metallicity
• A planet within the debris disk around the pre-main-sequence star AU Microscopii
• Wotan: Comprehensive time-series de-trending in Python
• CERES: A Set of Automated Routines for Echelle Spectra
• A public HARPS radial velocity database corrected for systematic errors
• Accounting for velocity jitter in planet search surveys
• Extrasolar planets and brown dwarfs around A-F type stars VI. High precision RV survey of early type dwarfs with HARPS
• New constraints on the planetary system around the young active star AU Mic. Two transiting warm Neptunes near mean-motion resonance
• A Search for Multi-Planet Systems Using the Hobby-Eberly Telescope
• The ELODIE survey for northern extra--solar planets I. 6 new extra--solar planet candidates
• A High-Eccentricity Low-Mass Companion to HD 89744
• One year of AU Mic with HARPS: I -- measuring the masses of the two transiting planets
• The SHARDDS survey: first resolved image of the HD114082 debris disk in Lower Centaurus Crux with SPHERE
• Five planets and an independent confirmation of HD 196885Ab from Lick Observatory
• Five New Exoplanets Orbiting Three Metal-Rich, Massive Stars: Two-Planet Systems Including Long-Period Planets, and an Eccentric Planet
• ISPY -- NACO Imaging Survey for Planets around Young stars: Survey description and results from the first 2.5 years of observations
• Truly eccentric. I. Revisiting eight single-eccentric planetary systems
• RVSPY -- Radial Velocity Survey for Planets around Young Stars. Target characterization and high-cadence survey
• On the Stellar Companion to the Exoplanet Hosting Star 30 Arietis B
• Transit analysis of the CoRoT-5, CoRoT-8, CoRoT-12, CoRoT-18, CoRoT-20, and CoRoT-27 systems with combined ground- and space-based photometry

Cited by in corpus (9)

• Monitoring the young planet host V1298 Tau with SPIRou: planetary system and evolving large-scale magnetic field
• TESS Investigation -- Demographics of Young Exoplanets (TI-DYE) II: a second giant planet in the 17-Myr system HIP 67522
• The high-albedo, low polarization disk around HD 114082 harbouring a Jupiter-sized transiting planet
• TOI-837b is a Young Saturn-sized Exoplanet with a Massive 70 $M_{\oplus }$ Core
• TOI-837 b: characterisation, formation and evolutionary history of an infant warm Saturn-mass planet
• Characterization of debris disks observed with SPHERE
• The "Drake equation" of exomoons -- a cascade of formation, stability and detection
• HD 715 b, a Warm Jupiter Orbiting a Massive Subgiant Discovered from a Single TESS Transit
• The Longest-period Young Transiting Exoplanets. A Duo of Puffy Giants inside a Debris Disk