A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: II. Diversity in C/O Ratios among Host Stars

Abstract

The era of JWST has enabled measurements of abundances of elements such as C, O, and even Na, S, K, and Fe in planetary atmospheres to very high precisions ($\sim$0.1 dex). Accurate inference of planet formation using these elemental abundances require the corresponding abundance measurements for the host star. We present the second set of results from our high-resolution spectroscopic survey of directly imaged companion host stars, measuring abundances of 16 elements (including C, O, Na, Mg, Si, S, K and Fe) for five directly imaged companion host stars. Using both the spectral fitting and the equivalent width methods, we find solar C/O ratios for HR 2562 (0.58 $\pm$ 0.09), AB Pic (0.50 $\pm$ 0.14), and YSES 1 (0.45 $\pm$ 0.05), and sub-solar C/O ratios for PZ Tel (0.28 $\pm$ 0.05) and $\beta$ Pic (0.22 $\pm$ 0.06). The $4\sigma$ sub-solar C/O detections for PZ Tel and $\beta$ Pic highlight the importance of accurate stellar C/O estimates for constraining planet formation. Subsequently, we combine our abundances with those from our previous work to measure population-level average elemental abundances. We find super-solar carbon and oxygen for this stellar population, indicating that the protoplanetary disks around these stars were potentially rich in volatiles. We compare stellar C/O to those of their companions, revealing super-stellar C/O for several objects that suggest planet-like formation mechanisms. We also compare the C/O of our directly imaged companion host star population with other planet host stars using the Kolmogorov-Smirnov Test, which indicates insufficient evidence to differentiate between the various stellar populations

arXiv comment37 pages, 22 figures, 9 tables

References in corpus (108)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The chemical composition of the Sun
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• The effects of snowlines on C/O in planetary atmospheres
• The Revised TESS Input Catalog and Candidate Target List
• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• A probable giant planet imaged in the Beta Pictoris disk
• Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager
• Gravitational Instabilities in Circumstellar Disks
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• Separating gas-giant and ice-giant planets by halting pebble accretion
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• Spectroscopy Made Easy: Evolution
• Detection of Carbon Monoxide and Water Absorption Lines in an Exoplanet Atmosphere
• The imprint of exoplanet formation history on observable present-day spectra of hot Jupiters
• Exoplanetary Atmospheres: Key Insights, Challenges and Prospects
• The California-Kepler Survey. I. High Resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting Planets
• BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups With Previously Known Signs of Youth
• The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
• Stellar Abundances in the Solar Neighborhood: The Hypatia Catalog
• Direct Imaging of a Cold Jovian Exoplanet in Orbit around the Sun-like Star GJ 504
• A companion to AB Pic at the planet/brown dwarf boundary
• A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group
• The SPHERE infrared survey for exoplanets (SHINE). III. The demographics of young giant exoplanets below 300 au with SPHERE
• Methane, Carbon Monoxide, and Ammonia in Brown Dwarfs and Self-Luminous Giant Planets
• Retrieving scattering clouds and disequilibrium chemistry in the atmosphere of HR 8799e
• Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity
• The Formation Mechanism of Gas Giants on Wide Orbits
• The Age of Beta Pic
• Tracing the formation history of giant planets in protoplanetary disks with Carbon, Oxygen, Nitrogen and Sulphur
• First light of the VLT planet finder SPHERE. III. New spectrophotometry and astrometry of the HR8799 exoplanetary system
• Setting the volatile composition of (exo)planet-building material. Does chemical evolution in disk midplanes matter?
• New grids of ATLAS9 atmospheres I: Influence of convection treatments on model structure and on observable quantities
• How drifting and evaporating pebbles shape giant planets I: Heavy element content and atmospheric C/O
• Chromospheric activity as age indicator
• Carbon-rich Giant Planets: Atmospheric Chemistry, Thermal Inversions, Spectra, and Formation conditions
• Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE
• A library of near-infrared integral field spectra of young M-L dwarfs
• Carbon, oxygen, and iron abundances in disk and halo stars. Implications of 3D non-LTE spectral line formation
• The Gemini NICI Planet-Finding Campaign: Discovery of a Close Substellar Companion to the Young Debris Disk Star PZ Tel
• Peering into the formation history of beta Pictoris b with VLTI/GRAVITY long baseline interferometry
• First light of the VLT planet finder SPHERE. II. The physical properties and the architecture of the young systems PZ Tel and HD 1160 revisited
• Gas Giant Formation with Small Cores Triggered by Envelope Pollution by Icy Planetesimals
• Elemental ratios in stars vs planets
• The International Deep Planet Survey II: The frequency of directly imaged giant exoplanets with stellar mass
• C/O and Snowline Locations in Protoplanetary Disks: The Effect of Radial Drift and Viscous Gas Accretion
• The 13O-rich atmosphere of a young accreting super-Jupiter
• The Inner Rings of Beta Pictoris
• beta Pic b position relative to the Debris Disk
• All-sky Co-moving Recovery Of Nearby Young Members. (ACRONYM) II: The Beta Pictoris Moving Group
• Silicon and Nickel Enrichment in Planet-Host Stars: Observations and Implications for the Core-Accretion Theory of Planet Formation
• The mass of the young planet Pictoris b through the astrometric motion of its host star
• 3-D selection of 167 sub-stellar companions to nearby stars
• Critical core mass for enriched envelopes: the role of H2O condensation
• Oxygen abundances in G- and F-type stars from HARPS
• The Orbit and Transit Prospects for $\beta$ Pictoris b constrained with One Milliarcsecond Astrometry
• C/O Ratios of Stars with Transiting Hot Jupiter Exoplanets
• How drifting and evaporating pebbles shape giant planets II: Volatiles and refractories in atmospheres
• Chemical Diversity in Protoplanetary Disks and Its Impact on the Formation History of Giant Planets
• From stellar nebula to planetesimals
• The GJ 504 system revisited. Combining interferometric, radial velocity, and high contrast imaging data
• Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1
• Direct discovery of the inner exoplanet in the HD206893 system. Evidence for deuterium burning in a planetary-mass companion
• Discovery of a Substellar Companion to the Nearby Debris Disk Host HR 2562
• Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert
• Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys
• The Role of Ice Compositions for Snowlines and the C/N/O Ratios in Active Disks
• A medium-resolution spectrum of the exoplanet HIP 65426 b
• Deep exploration of the planets HR 8799 b, c, and d with moderate resolution spectroscopy
• The Young Suns Exoplanet Survey: Detection of a wide orbit planetary mass companion to a solar-type Sco-Cen member
• Assessing the C/O Ratio Formation Diagnostic: A Potential Trend with Companion Mass
• Near-infrared integral-field spectra of the planet/brown dwarf companion AB Pic b
• Volatile-to-sulfur Ratios Can Recover a Gas Giant's Accretion History
• CNO behaviour in planet-harbouring stars. II. Carbon abundances in stars with and without planets using the CH band
• The Second Discovery from the COol Companions ON Ultrawide orbiTS (COCONUTS) Program: A Cold Wide-Orbit Exoplanet around a Young Field M Dwarf at 10.9 pc
• Host star metallicity of directly imaged wide-orbit planets: implications for planet formation
• Direct detection of a substellar companion to the young nearby star PZ Telescopii
• Peering into the Young Planetary System AB Pic. Atmosphere, Orbit, Obliquity & Second Planetary Candidate
• Characterization of Population III Stars with Stellar Atmosphere and Evolutionary Modeling and Predictions of their Observability with the James Webb Space Telescope
• Orbital and dynamical analysis of the system around HR 8799. New astrometric epochs from VLT/SPHERE and LBT/LUCI
• The ESO SupJup Survey III: Confirmation of 13CO in YSES 1 b and Atmospheric Detection of YSES 1 c with CRIRES+
• Retrieval study of cool, directly imaged exoplanet 51 Eri b
• Moderate-Resolution $K$-Band Spectroscopy of Substellar Companion $\kappa$ Andromedae b
• Probing the impact of varied migration and gas accretion rates for the formation of giant planets in the pebble accretion scenario
• Limits on the Mass and Initial Entropy of 51 Eri b from Gaia EDR3 Astrometry
• Silicate clouds and a circumplanetary disk in the YSES-1 exoplanet system
• VLT/SPHERE astrometric confirmation and orbital analysis of the brown dwarf companion HR 2562 B
• Chemical analysis of early-type stars with planets
• An updated visual orbit of the directly-imaged exoplanet 51 Eridani b and prospects for a dynamical mass measurement with Gaia
• New Generation Stellar Spectral Libraries in the Optical and Near-Infrared I: The Recalibrated UVES-POP Library for Stellar Population Synthesis
• New spectro-photometric characterization of the substellar object HR 2562 B using SPHERE
• RVSPY -- Radial Velocity Survey for Planets around Young Stars. Target characterization and high-cadence survey
• Fresh view of the hot brown dwarf HD 984 B through high-resolution spectroscopy
• Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
• First spectroscopic observations of the sub-stellar companion of the young debris disk star PZ Telescopii
• The FEROS--Lick/SDSS observational database of spectral indices of FGK stars for stellar population studies
• A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: I. Determination of diagnostic stellar abundances for planet formation and composition
• Direct Spectroscopy of 51 Eridani b with JWST NIRSpec
• Measuring the Stellar and Planetary Properties of the 51 Eridani System

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