Interferometric Survey of Stellar Parameters: Towards homogeneous FGK stars parameters and surface-brightness color relation in the context of PLATO space mission

@misc{bustos2026interferometric,
  title = {{Interferometric Survey of Stellar Parameters: Towards homogeneous FGK stars parameters and surface-brightness color relation in the context of PLATO space mission}},
  author = {Romina V. Ibañez Bustos and Denis Mourard and Nicolas Nardetto and Jeremy Jones and Nayeem Ebrahimkutty and Juraj Jonák and Hugo Nowacki and Mathieu Vrard and Philippe Berio and Julien Dejonghe and Roxanne Ligi and Frédéric Morand and David Salabert and Orlagh Creevey and Armando Domiciano de Souza and Manon Bailleul and Karine Perraut and Markus Wittkowski and John D. Monnier and Stefan Kraus and Narsireddy Anugu and Mayra Gutierrez and Noura Ibrahim},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.30557},
  eprint = {2608.30557},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.30557},
}

TY  - UNPB
TI  - Interferometric Survey of Stellar Parameters: Towards homogeneous FGK stars parameters and surface-brightness color relation in the context of PLATO space mission
AU  - Romina V. Ibañez Bustos
AU  - Denis Mourard
AU  - Nicolas Nardetto
AU  - Jeremy Jones
AU  - Nayeem Ebrahimkutty
AU  - Juraj Jonák
AU  - Hugo Nowacki
AU  - Mathieu Vrard
AU  - Philippe Berio
AU  - Julien Dejonghe
AU  - Roxanne Ligi
AU  - Frédéric Morand
AU  - David Salabert
AU  - Orlagh Creevey
AU  - Armando Domiciano de Souza
AU  - Manon Bailleul
AU  - Karine Perraut
AU  - Markus Wittkowski
AU  - John D. Monnier
AU  - Stefan Kraus
AU  - Narsireddy Anugu
AU  - Mayra Gutierrez
AU  - Noura Ibrahim
PY  - 2026
DA  - 2026/08/31
PB  - arXiv
DO  - 10.48550/arxiv.2608.30557
UR  - https://arxiv.org/abs/2608.30557
AB  - The estimation of stellar angular diameters can be performed from the surface brightness - color relation (SBCR) and photometry. The SBCR have been considered by the PLATO space mission as an independent empirical alternative for estimating stellar radii of FGK stars. In this context, we have implemented an homogeneous approach not only for calibrating the SBCR for FGK-IV/V stars but, also for determining their fundamental parameters in order to place the stars reliably on the HR diagram and to study their impact on the SBCR. We have performed interferometric observations of 18 quiescent FGK-IV/V stars in the Gaia color range of 3.088 ≤ G ≤ 5.498. For the first time, we used 3 different interferometers operating in the R, H , and K bands to measure polychromatic limb-darkened angular diameters (LDAD). In parallel, by using public domain spectra we have estimated the stellar parameters (T_eff, $log g$ and Z) by using the open python tool iSpec. We achieved an average accuracy of 2.3% for the LDAD based on polychromatic observations. However, we have observed that our SBCR does not follow the calibration of the relation between surface brightness and color in Gaia found in the literature. Furthermore, we found that $log g$ and Z have no impact on the SBC relation; given the characteristics of our sample of quiescent stars, it constitutes an ideal set of targets for conducting a new SBCR calibration within the framework of the PLATO space mission. In this context, we reported a SBCR calibration with $σ_{RMS} = $ 0.012, 0.009, 0.009 in the G, G_BP and G_RP Gaia bands, respectively. This article is part of a series of papers reporting the first results obtained using a polychromatic approach to measure LDAD, employing a fully homogeneous methodology for both determining the fundamental parameters of stars and measuring the LDAD, θ_LD.
ER  -