SPECIES I: Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars

Abstract

The detection and subsequent characterisation of exoplanets are intimately linked to the characteristics of their host star. Therefore, it is necessary to study the star in detail in order to understand the formation history and characteristics of their companion(s). Our aims were to develop a community tool that allows the automated calculation of stellar parameters for a large number of stars, using high resolution echelle spectra and minimal photometric magnitudes, and introduce the first results in this work. We measured the equivalent widths of several iron lines and used them to solve the radiative transfer equation assuming local thermodynamic equilibrium to obtain the atmospheric parameters ($T_{\text{eff}}$, [Fe/H], logg and ${\xi }_t$). We used these values to derive the abundance of 11 chemical elements in the stellar photosphere (Na, Mg, Al, Si, Ca, Ti, Cr, Mn, Ni, Cu and Zn). Rotation and macroturbulent velocity were obtained using temperature calibrators and synthetic line profiles to match the observed spectra of five absorption lines. Finally, by interpolating in a grid of MIST isochrones, we derived the mass, radius and age using a Bayesian approach. SPECIES obtains bulk parameters that are in good agreement with measured values from different existing catalogues, including when different methods are used to derive them. We find excellent agreement with previous works that used similar methodologies. We find discrepancies in the chemical abundances for some elements with respect to other works, which could be produced by differences in $T_{\text{eff}}$, or in the line list or the atomic line data used to derive them. We also obtained analytic relations to describe the correlations between different parameters, and we implemented new methods to better handle these correlations, which provides a better description of the uncertainties associated with the measurements.

28 pages, 26 figures, resubmitted to A&A

References in corpus (14)

• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
• A new implementation of the infrared flux method using the 2MASS catalogue
• A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
• ARES v2 - new features and improved performance
• Accurate fundamental parameters for Lower Main Sequence Stars
• Chemical abundances of 451 stars from the HARPS GTO planet search program: Thin disc, thick disc, and planets
• The Gaia FGK Benchmark Stars - High resolution spectral library
• Planet Engulfment by ~1.5-3 Solar-Mass Red Giants
• Metallicities & Activities of Southern Stars
• Broadband UBVRI Photometry of Horizontal-Branch and Metal-Poor Candidates from the HK and Hamburg/ESO Surveys. I
• The test case of HD26965: difficulties disentangling weak Doppler signals from stellar activity
• New spectroscopic binary companions of giant stars and updated metallicity distribution for binary systems

Cited by in corpus (51)

• Accuracy and precision of industrial stellar abundances
• A public HARPS radial velocity database corrected for systematic errors
• ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
• An Ultra-Hot Neptune in the Neptune desert
• NGTS-4b: A sub-Neptune Transiting in the Desert
• Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments are Common
• SteParSyn: A Bayesian code to infer stellar atmospheric parameters using spectral synthesis
• From scattered-light to millimeter emission: A comprehensive view of the Gyr-old system of HD 202628 and its eccentric debris ring
• Uniform Forward-Modeling Analysis of Ultracool Dwarfs. II. Atmospheric Properties of 55 Late-T Dwarfs
• Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions
• StePar: an automatic code to infer stellar atmospheric parameters
• TOI-132 b: A short-period planet in the Neptune desert transiting a $V=11.3$ G-type star
• Multi-wavelength variability of the young solar analog iota Hor. X-ray cycle, star spots, flares, and UV emission
• NGTS-2b: An inflated hot-Jupiter transiting a bright F-dwarf
• NGTS-6b: An Ultra Short Period Hot-Jupiter Orbiting an Old K Dwarf
• The McDonald Accelerating Stars Survey (MASS): White Dwarf Companions Accelerating the Sun-like Stars 12 Psc and HD 159062
• Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO
• The Magellan/PFS Exoplanet Search: A 55-day period dense Neptune transiting the bright ($V=8.6$) star HD 95338
• Precise Dynamical Masses of Epsilon Indi Ba and Bb: Evidence of Slowed Cooling at the L/T Transition
• An ablating super-Earth in an eccentric binary from the Dispersed Matter Planet Project
• Masses, Oxygen and Carbon abundances in CHEPS dwarf stars
• EPIC 201498078b: A low density Super Neptune on an eccentric orbit
• Precise dynamical masses of new directly imaged companions from combining relative astrometry, radial velocities, and Hipparcos-Gaia eDR3 accelerations
• SPECIES II. Stellar parameters of the EXPRESS program giant star sample
• Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS
• Evidence of extra-mixing in field giants as traced by lithium and carbon isotope ratio
• TOI-1075 b: A Dense, Massive, Ultra-Short Period Hot Super-Earth Straddling the Radius Gap
• A dense mini-Neptune orbiting the bright young star HD 18599
• Projected Rotational Velocities and Fundamental Properties of Low-Mass Pre-Main Sequence Stars in the Taurus-Auriga Star Forming Region
• The mu Arae planetary system: Radial velocities and astrometry
• Radial Velocity Monitoring of the Young Star Hubble 4: Disentangling Starspot Lifetimes from Orbital Motion
• Fine Structure of the Age-Chromospheric Activity Relation in Solar-Type Stars: II. H$\alpha$ Line
• HD 183579b: A Warm Sub-Neptune Transiting a Solar Twin Detected by TESS
• DMPP-4: Candidate sub-Neptune mass planets orbiting a naked-eye star
• HD 28185 Revisited: An Outer Planet, Instead of a Brown Dwarf, On a Saturn-like Orbit
• VPNEP: Detailed characterization of TESS targets around the Northern Ecliptic Pole
• NGTS-21b: An Inflated Super-Jupiter Orbiting a Metal-poor K dwarf
• DMPP-3: confirmation of short-period S-type planet(s) in a compact eccentric binary star system, and warnings about long-period RV planet detections
• NGTS-EB-7, an eccentric, long-period, low-mass eclipsing binary
• Correlating Intrinsic Stellar Parameters with Mg II Self-Reversal Depths
• S-Process Nucleosynthesis in Chemically Peculiar Binaries
• The Disk Veiling Effect of the Black Hole Low-Mass X-ray Binary A0620-00
• Deriving Iodine-free spectra for high-resolution echelle spectrographs
• Precise Masses and Orbits for Nine Radial Velocity Exoplanets
• Destruction of "Peas in a Pod?" A Candidate Multi-planet System Around the Nearby, Bright Star, HD208487
• Dynamical architecture of the HD 107148 system
• A transiting hot Jupiter with two outer siblings orbiting an intermediate-mass post main-sequence star
• Cold giant discoveries from a joint radial-velocity and astrometry framework
• Spectral Ratio Analysis: probing of a new suite of stellar activity indicators as a tool for astrophysical noise mitigation
• A Catalog of Homogeneously Derived Stellar Parameters for Spectroscopic Survey Stars
• TOI-333b: A Neptune Desert planet around a F7V star