Analysis of the public HARPS/ESO spectroscopic archive -- Jupiter-like planets around HD 103891 and HD 105779

Abstract

Aims. We use the recently published database (Trifonov et al. 2020) of radial velocities (RVs) that were derived from fifteen years of HARPS/ESO observations to search for planet candidates. Methods. For targets with sufficient RV data, we apply an automated algorithm to identify significant periodic signals and fit a Keplerian model for orbital estimates. We also search the auxiliary data of stellar-activity indices and compare our findings with existing literature, to detect periodic RV signals that have no counterpart in the activity timeseries. The most convincing signals are then manually inspected to designate additional false planet detection, focusing the search on long-period (P > 1 000 d) massive candidates around FGK dwarf stars. Results. We identify two Jupiter analogs, in orbit around the slightly evolved F8V star HD 103891 and the Solar-like star HD 105779. We use nested sampling to derive their orbital parameters, and find their orbital periods to be 1919 +/- 16 d and 2412 +/- 54 d, while their minimum masses are 1.44 +/- 0.02 M Jup and 0.64 +/- 0.06 M Jup , respectively. While the orbit of HD 103891 b is slightly eccentric (e = 0.31 +/- 0.03), that of HD 105779 b is likely circular (e < 0.16). Conclusions. With minimum astrometric signatures of 59 and 42 $\mu$as, HD 103891 b and HD 105779 b join the growing sample of planets whose exact masses may soon be derived with Gaia astrometry. This finding also highlights the importance of long-term RV surveys to study planetary occurrence beyond the snow line of Solar-like stars.

arXiv comment14 pages, 13 figures, Submitted to A&A

References in corpus (48)

• The Gaia mission
• The Transiting Exoplanet Survey Satellite
• Validation of the new Hipparcos reduction
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Gaia Data Release 2: The astrometric solution
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Gaia Early Data Release 3: The astrometric solution
• The Keck Planet Search: Detectability and the Minimum Mass and Orbital Period Distribution of Extrasolar Planets
• The Occurrence and Architecture of Exoplanetary Systems
• No planet for HD 166435
• Rotation Periods of 34,030 Kepler Main-Sequence Stars: The Full Autocorrelation Sample
• SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
• The CORALIE survey for southern extra-solar planets VII. Two short-period Saturnian companions to HD108147 and HD168746
• Improving the Efficiency of Markov Chain Monte Carlo for Analyzing the Orbits of Extrasolar Planets
• Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators
• Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly
• Astrometric exoplanet detection with Gaia
• Juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems
• Spectroscopic stellar parameters for 582 FGK stars in the HARPS volume-limited sample. Revising the metallicity-planet correlation
• Hints for a Turnover at the Snow Line in the Giant Planet Occurrence Rate
• Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program II: Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd and Eu
• The Super Earth-Cold Jupiter Relations
• The low-level radial velocity variability in Barnard's star (=GJ 699). Secular acceleration, indications for convective redshift, and planet mass limits
• A public HARPS radial velocity database corrected for systematic errors
• The CARMENES search for exoplanets around M dwarfs -- Planet occurrence rates from a subsample of 71 stars
• Hot super-Earths and giant planet cores from different migration histories
• Stellar chromospheric activity of 1,674 FGK stars from the AMBRE-HARPS sample I. A catalogue of homogeneous chromospheric activity
• Accounting for velocity jitter in planet search surveys
• Instrumentation for the detection and characterization of exoplanets
• Correcting HIRES radial velocities for small systematic errors
• Gas giant planets as dynamical barriers to inward-migrating super-Earths
• Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: Nine confirmed planets and two confirmed brown dwarfs
• Stacked Bayesian general Lomb-Scargle periodogram: Identifying stellar activity signals
• Astrometric Detection of Giant Planets Around Nearby M Dwarfs: The Gaia Potential
• A Consistency Test of Spectroscopic Gravities for Late-Type Stars
• A nearby transiting rocky exoplanet that is suitable for atmospheric investigation
• YARARA: Significant improvement of RV precision through post-processing of spectral time-series
• Characterization of a spurious one-year signal in HARPS data
• The eccentricity distribution of giant planets and their relation to super-Earths in the pebble accretion scenario
• True masses of the long-period companions to HD 92987 and HD 221420 from Hipparcos-Gaia astrometry
• Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur
• The GAPS Programme with HARPS-N at TNG XVII. Line profile indicators and kernel regression as diagnostics of radial-velocity variations due to stellar activity in solar-like stars
• Optimized modeling of Gaia-Hipparcos astrometry for the detection of the smallest cold Jupiter and confirmation of seven low mass companions
• Catalogue of exoplanets accessible in reflected starlight to the Nancy Grace Roman Space Telescope. A population study and prospects for phase-curve measurements
• Toward Complete Characterization: Prospects for Directly Imaging Transiting Exoplanets
• TIC~257060897b: an inflated, low-density, hot-Jupiter transiting a rapidly evolving subgiant star
• Prospects for detecting the astrometric signature of Barnard's Star b

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• The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries
• Exoplanets Around Red Giants: Distribution and Habitability