A review of planetary systems around HD 99492, HD 147379 and HD 190007 with HARPS-N

Abstract

The Rocky Planet Search (RPS) program is dedicated to a blind radial velocity (RV) search of planets around bright stars in the Northern hemisphere, using the high-resolution echelle spectrograph HARPS-N installed on the Telescopio Nazionale Galileo (TNG). The goal of this work is to revise and update the properties of three planetary systems by analysing the HARPS-N data with state-of-the-art stellar activity mitigation tools. The stars considered are HD 99492 (83Leo B), HD 147379 (Gl617 A) and HD 190007. We employ a systematic process of data modelling, that we selected from the comparison of different approaches. We use YARARA to remove instrumental systematics from the RV, and then use SPLEAF to further mitigate the stellar noise with a multidimensional correlated noise model. We also search for transit features in the Transiting Exoplanets Survey Satellite (TESS) data of these stars. We report on the discovery of a new planet around HD 99492, namely HD 99492 c, with an orbital period of 95.2 days and a minimum mass of msin i = 17.9 M_Earth, and refine the parameters of HD 99492 b. We also update and refine the Keplerian solutions for the planets around HD 147379 and HD 190007, but do not detect additional planetary signals. We discard the transiting geometry for the planets, but stress that TESS did not exhaustively cover all the orbital phases. The addition of the HARPS-N data, and the use of advanced data analysis tools, has allowed us to present a more precise view of these three planetary systems. It demonstrates once again the importance of long observational efforts such as the RPS program. Added to the RV exoplanet sample, these planets populate two apparently distinct populations revealed by a bimodality in the planets minimum mass distribution. The separation is located between 30 and 50 M_Earth.

27 pages, 26 figures (13 in Appendix); Accepted for publication in A&A

References in corpus (38)

• The Transiting Exoplanet Survey Satellite
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• The K2 Mission: Characterization and Early results
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• The CHEOPS mission
• Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
• Revisited Mass-Radius relations for exoplanets below 120 Earth masses
• A Guide to Realistic Uncertainties on Fundamental Properties of Solar-Type Exoplanet Host Stars
• CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS
• Magnetic activity in the HARPS M-dwarf sample. The rotation-activity relationship for very low-mass stars through R'HK
• Three years of Sun-as-a-star radial-velocity observations on the approach to solar minimum
• Three Years of HARPS-N High-Resolution Spectroscopy and Precise Radial Velocity Data for the Sun
• A giant impact as the likely origin of different twins in the Kepler-107 exoplanet system
• Measuring precise radial velocities on individual spectral lines : II. Dependance of stellar activity signal on line depth
• A pair of TESS planets spanning the radius valley around the nearby mid-M dwarf LTT 3780
• Separating planetary reflex Doppler shifts from stellar variability in the wavelength domain
• Filtering solar-like oscillations for exoplanet detection in radial velocity observations
• Two massive rocky planets transiting a K-dwarf 6.5 parsecs away
• The Exoplanet Orbital Eccentricity - Multiplicity Relation and the Solar System
• YARARA: Significant improvement of RV precision through post-processing of spectral time-series
• The CARMENES search for exoplanets around M dwarfs - HD 147379b: A nearby Neptune in the temperate zone of an early-M dwarf
• RASSINE: Interactive tool for normalising stellar spectra I. Description and performance of the code
• An unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561
• Bias and robustness of eccentricity estimates from radial velocity data
• 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
• Pinning down the mass of Kepler-10c: the importance of sampling and model comparison
• K2-111: an old system with two planets in near-resonance
• Stellar activity correction using PCA decomposition of shells
• Efficient modeling of correlated noise I. Statistical significance of periodogram peaks
• Improving exoplanet detection capabilities with the false inclusion probability. Comparison with other detection criteria in the context of radial velocities
• Unbiasing the density of TTV-characterised sub-Neptunes: Update of the mass-radius relationship of 34 Kepler planets
• Sub-m s${}^{-1}$ upper limits from a deep HARPS-N radial-velocity search for planets orbiting HD 166620 and HD 144579
• A full transit of ${\nu }^2$ Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
• The HARPS search for southern extra-solar planets. XLVI: 12 super-Earths around the solar type stars HD39194, HD93385, HD96700, HD154088, and HD189567
• A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
• Characterization of the HD 108236 system with CHEOPS and TESS. Confirmation of a fifth transiting planet
• Independent validation of the temperate Super-Earth HD79211 b using HARPS-N

Cited by in corpus (2)

• Optimal frequency-domain analysis for spacecraft time series: Introducing the missing-data multitaper power spectrum estimator
• TESS and HARPS-N unveil two planets transiting TOI-1453. A super-Earth and one of the lowest mass sub-Neptunes