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Atmospheric Parameters and Luminosities of Nearby M Dwarfs – Estimating Habitable Exoplanet Detectability with the E-ELT

Published online by Cambridge University Press:  12 September 2017

Gustavo F. Porto de Mello ,
Riano E. Giribaldi ,
Diego Lorenzo-Oliveira  and
Nathália M. Paes Leme
Gustavo F. Porto de Mello
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antonio 43, Rio de Janeiro, RJ, CEP: 20080-090, Brazil email: gustavo@astro.ufrj.br
Riano E. Giribaldi
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antonio 43, Rio de Janeiro, RJ, CEP: 20080-090, Brazil email: gustavo@astro.ufrj.br
Diego Lorenzo-Oliveira
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antonio 43, Rio de Janeiro, RJ, CEP: 20080-090, Brazil email: gustavo@astro.ufrj.br
Nathália M. Paes Leme
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antonio 43, Rio de Janeiro, RJ, CEP: 20080-090, Brazil email: gustavo@astro.ufrj.br
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Abstract

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We derive Teff and [Fe/H] for a sample of 72 nearby M-dwarfs with Hipparcos parallaxes and δ < +30. Spectra, acquired at the Observatório do Pico dos Dias, Brazil, have R = 10,000 and S/N ≳ 100 for nearly all targets in the λλ8380-8880 range. Atmospheric parameters were derived from VJHK colors and a system of spectral line indices calibrated against sample stars with interferometric Teff and [Fe/H] from detailed analysis of FGK binary companions. A PCA method of calibration yields internal errors within 70 K and 0.1 dex for Teff and [Fe/H]. For 18 stars we present the first Teff or [Fe/H] derivation in the literature. We compute the star's luminosities, calculate the position of their habitable zones and estimate that, were all of they to harbour rocky planets inside their HZ, 15–20 of these would be detectable by the E-ELT Planetary Camera and Spectrograph.

Keywords

stars: abundancesstars: late-typestars: low-mass(stars:) planetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 371 - 373
Copyright
Copyright © International Astronomical Union 2017 

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