Abstract
Aims. The catalog of Stars With ExoplanETs (SWEET-Cat) was originally introduced in 2013. Since then many more exoplanets have been confirmed, increasing significantly the number of host stars listed there. A crucial step toward a comprehensive understanding of these new worlds is the precise and homogeneous characterization of their host stars. Better spectroscopic stellar parameters along with new results from Gaia eDR3 provide updated and precise parameters for the discovered planets. A new version of the catalog, whose homogeneity in the derivation of the parameters is key to unraveling star–planet connections, is available to the community. Methods. We made use of high-resolution spectra for planet-host stars, either observed by our team or collected through public archives. The spectroscopic stellar parameters were derived for the spectra following the same homogeneous process using ARES and MOOG (ARES+MOOG) as for the previous SWEET-Cat releases. We re-derived parameters for the stars in the catalog using better quality spectra and/or using the most recent versions of the codes. Moreover, the new SWEET-Cat table can now be more easily combined with the planet properties listed both at the Extrasolar Planets Encyclopedia and at the NASA exoplanet archive to perform statistical analyses of exoplanets. We also made use of the recent Gaia eDR3 parallaxes and respective photometry to derive consistent and accurate surface gravity values for the host stars. Results. We increased the number of stars with homogeneous parameters by more than 40% (from 645 to 928). We reviewed and updated the metallicity distributions of stars hosting planets with different mass regimes comparing the low-mass planets (< 30 M⊕) with the high-mass planets. The new data strengthen previous results showing the possible trend in the metallicity-period-mass diagram for low-mass planets.
Highlights
Studies of planetary systems have grown immensely in recent decades following the first detections of exoplanets orbiting solar-type stars (e.g., Mayor & Queloz 1995) and the thousands of exoplanets detected since
We presented a significant update of SWEET-Cat where 283 planet host stars have new precise and homogeneous spectroscopic parameters using spectra that we collected from different sources
We reviewed most spectroscopic parameters using new combined spectra and recent versions of the codes used in our spectroscopic analysis
Summary
Studies of planetary systems have grown immensely in recent decades following the first detections of exoplanets orbiting solar-type stars (e.g., Mayor & Queloz 1995) and the thousands of exoplanets detected since. Several works have focused on other aspects, such as planetary system architectures (Adibekyan 2019; Dawson & Johnson 2018), and planet frequency, and its dependence on other stellar parameters like the stellar mass (e.g., Mortier et al 2013) These are a small representation of the statistical studies performed focusing. This work presents a significant upgrade to SWEET-Cat1 It consists of the addition of 283 new planet hosts, the inclusion of new data relevant for the characterization of the planet-host stars, the inclusion of the link to the NASA archive exoplanet database (Akeson et al 2013), in addition to the already existing link to the Extrasolar Planets Encyclopedia (Schneider et al 2011), and the rederivation of spectroscopic parameters from better quality or recent spectra using the latest updated codes developed by our group.
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