@Article{BotelhoMMBSASBRYDAG:2019:ImHaRo,
author = "Botelho, Rafael Bueno and Milone, Andr{\'e} de Castro and
Mel{\'e}ndez, J. and Bedell, M. and Spina, L. and Asplund, M. and
Santos, L. dos and Bean, J. L. and Ram{\'{\i}}rez, I. and Yong,
D. and Dreizler, S. and Alves-Brito, A. and Galarza, J. Yana",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade de
S{\~a}o Paulo (USP)} and Center for Computational Astrophysics,
Flatiron Institute and School of Physics and Astronomy, Monash
University and {The Australian National University} and
{Observatoire de l’Universite de Gen{\'e}ve} and {Department of
Astronomy \& Astrophysics} and {Tacoma Community College} and
{The Australian National University} and {Georg-August
Universit{\'a}t G{\"o}ttingen} and {Universidade Federal do Rio
Grande do Sul (UFRGS)} and {Universidade de S{\~a}o Paulo
(USP)}",
title = "Thorium in solar twins: implications for habitability in rocky
planets",
journal = "Monthly Notices of the Royal Astronomical Society",
year = "2019",
volume = "482",
number = "2",
pages = "1690--1700",
month = "jan.",
keywords = "stars: abundances – stars: fundamental parameters – stars:
solar-type – Galaxy: disc – solar neighbourhood, planets and
satellites: terrestrial planets.",
abstract = "We have investigated the thorium (Th) abundance in a sample of 53
thin disc solar twins covering a wide range of ages. These data
provide constrains on the mantle energy budget of terrestrial
planets that can be formed over the evolution of the Galaxys thin
disc. We have estimated Th abundances with an average precision of
0.025 dex (in both [Th/H] and [Th/Fe]) through comprehensive
spectral synthesis of a Th II line present at 4019.1290 Ĺ, using
very high resolution (R = 115 000) high quality HARPS spectra
obtained at the ESO La Silla Observatory. We have confirmed that
there is a large energy budget from Th decay for maintaining
mantle convection inside potential rocky planets around solar
twins, from the Galactic thin disc formation until now, because
the pristine [Th/H]ZAMS is super-solar on average under a uniform
dispersion of 0.056 dex (varying from +0.037 up to +0.138 dex
based on linear fits against isochrone stellar age). Comparing to
neodymium (Nd) and europium (Eu), two others neutron-capture
elements, the stellar pristine abundance of Th follows Eu along
the Galactic thin disc evolution, but it does not follow Nd,
probably because neodymium has a significant contribution from the
s-process (about 60 per cent).",
doi = "10.1093/mnras/sty2791",
url = "http://dx.doi.org/10.1093/mnras/sty2791",
issn = "0035-8711 and 1365-2966",
language = "en",
targetfile = "botelho_thorium.pdf",
urlaccessdate = "03 jun. 2024"
}