The peculiar chemical pattern of the WASP-160 binary system: signatures of planetary formation and evolution?
arXiv:2109.04590 · doi:10.3847/1538-3881/ac25ef
Abstract
Wide binary stars with similar components hosting planets provide a favorable opportunity for exploring the star-planet chemical connection. We perform a detailed characterization of the solar-type stars in the WASP-160 binary system. No planet has been reported yet around WASP-160A while WASP-160B is known to host a transiting Saturn-mass planet, WASP-160B b. For this planet, we also derive updated properties from both literature and new observations. Furthermore, using TESS photometry, we constrain the presence of transiting planets around WASP-160A and additional ones around WASP-160B. The stellar characterization includes, for the first time, the computation of high-precision differential atmospheric and chemical abundances of 25 elements based on high-quality Gemini-GRACES spectra. Our analysis reveals evidence of a correlation between the differential abundances and the condensation temperatures of the elements. In particular, we find both a small but significant deficit of volatiles and an enhancement of refractory elements in WASP-160B relative to WASP-160A. After WASP-94, this is the second stellar pair among the shortlist of planet-hosting binaries showing this kind of peculiar chemical pattern. Although we discuss several plausible planet formation and evolution scenarios for WASP-160A and B that could explain the observed chemical pattern, none of them can be conclusively accepted or rejected. Future high-precision photometric and spectroscopic follow-up, as well as high-contrast imaging observations, of WASP-160A and B, might provide further constraints on the real origin of the detected chemical differences.
Accepted for publication in AJ, 28 pages, 13 figures, 5 tables
References in corpus (42)
- The Transiting Exoplanet Survey Satellite
- EXOFAST: A fast exoplanetary fitting suite in IDL
- VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
- Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
- Toward a Deterministic Model of Planetary Formation V. Accumulation Near the Ice Line
- High-precision abundances of elements in solar twin stars: Trends with stellar age and elemental condensation temperature
- Transit Least Squares: Optimized transit detection algorithm to search for periodic transits of small planets
- Oxygen Abundances in Nearby Stars. Clues to the formation and evolution of the Galactic disk
- The Solar Twin Planet Search. I. Fundamental parameters of the stellar sample
- Li abundances in F stars: planets, rotation and galactic evolution
- The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs
- Stellar parameters and chemical abundances of 223 evolved stars with and without planets
- The Mount Wilson Observatory S-index of the Sun
- Stellar Chemical Abundances: In Pursuit of the Highest Achievable Precision
- 18 Sco: a solar twin rich in refractory and neutron-capture elements. Implications for chemical tagging
- Short dissipation times of proto-planetary discs - an artifact of selection effects?
- On the origin of stars with and without planets. Tc trends and clues to Galactic evolution
- Identical or fraternal twins? : The chemical homogeneity of wide binaries from Gaia DR2
- Gas flow and accretion via spiral streamers and circumstellar disks in a young binary protostar
- High precision abundances in the 16 Cyg binary system: a signature of the rocky core in the giant planet
- A Comparison of Stellar Elemental Abundance Techniques and Measurements
- Collisional and Thermal Emission Models of Debris Disks: Towards Planetesimal Population Properties
- Abundance Differences Between Exoplanet Binary Host Stars XO-2N and XO-2S -- Dependence on Stellar Parameters
- What are little worlds made of? Stellar abundances and the building blocks of planets
- How magnetic activity alters what we learn from stellar spectra
- The lithium abundances for a large sample of red giants
- Detailed Abundances of Planet-Hosting Wide Binaries. I. Did Planet Formation Imprint Chemical Signatures in the Atmospheres of HD 20782/81?
- Signatures of rocky planet engulfment in HAT-P-4. Implications for chemical tagging studies
- Fingerprints of giant planets in the composition of solar twins
- Lithium Abundances in a Sample of Planet Hosting Dwarfs
- The Solar Twin Planet Search. V. Close-in, low-mass planet candidates and evidence of planet accretion in the solar twin HIP 68468
- Detailed chemical compositions of planet hosting stars: I. Exploration of possible planet signatures
- The Magellan PFS Planet Search Program: Radial Velocity and Stellar Abundance Analyses of the 360 AU, Metal-Poor Binary "Twins" HD 133131A & B
- Behaviour of elements from lithium to europium in stars with and without planets
- Exoplanet hosts reveal lithium depletion: Results from a homogeneous statistical analysis
- GRACES: Gemini remote access to CFHT ESPaDOnS Spectrograph through the longest astronomical fiber ever made (Experimental phase completed.)
- Discarding orbital decay in WASP-19b after one decade of transit observations
- Directly imaged exoplanets in reflected starlight. The importance of knowing the planet radius
- High-precision analysis of binary stars with planets. I. Searching for condensation temperature trends in the HD 106515 system
- Fine structure of the age-chromospheric activity relation in solar-type stars I: The Ca II infrared triplet: Absolute flux calibration
- An examination of the effect of the TESS extended mission on southern hemisphere monotransits
- Gemini-GRACES high-quality spectra of Kepler evolved stars with transiting planets I. Detailed characterization of multi-planet systems Kepler-278 and Kepler-391