Candidate exoplanet host HD131399A: a nascent Am star
N. Przybilla, P. Aschenbrenner, S. Buder

TL;DR
This study characterizes the primary star of the HD131399 system, revealing its atmospheric parameters, elemental abundances, and the onset of the Am phenomenon, providing insights into its chemical history and stellar evolution.
Contribution
It presents a detailed non-LTE spectral analysis of HD131399A, constraining its fundamental parameters and chemical composition, and discusses the implications for Am star formation and diffusion models.
Findings
Star's Teff=9200K, log g=4.37, mass=1.95 Msun
Light elements consistent with cosmic abundances, C/O=0.45
Non-LTE effects can significantly alter abundance measurements
Abstract
Direct imaging suggests that there is a Jovian exoplanet around the primary A-star in the triple-star system HD131399. We investigate a high-quality spectrum of the primary component HD131399A obtained with FEROS on the ESO/MPG 2.2m telescope, aiming to characterise the star's atmospheric and fundamental parameters, and to determine elemental abundances at high precision and accuracy. The aim is to constrain the chemical composition of the birth cloud of the system and therefore the bulk composition of the putative planet. A hybrid non-local thermal equilibrium (non-LTE) model atmosphere technique is adopted for the quantitative spectral analysis. Comparison with the most recent stellar evolution models yields the fundamental parameters. The atmospheric and fundamental stellar parameters of HD131399A are constrained to Teff=9200+-100 K, log g=4.37+-0.10, M=1.95+0.08-0.06 Msun,…
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