Photometric modulation in stars with planets detected by the TESS space mission
Probing planet formation with chemical abundances of solar type stars
Can marine and terrestrial subsurfaces in Brazil harbor archaea that may illuminat...
| Full text | |
| Author(s): Show less - |
Botelho, R. B.
[1]
;
Milone, A. de C.
[1]
;
Melendez, J.
[2]
;
Bedell, M.
[3]
;
Spina, L.
[4]
;
Asplund, M.
[5]
;
dos Santos, L.
[6]
;
Bean, J. L.
[7]
;
Ramirez, I.
[8]
;
Yong, D.
[5]
;
Dreizler, S.
[9]
;
Alves-Brito, A.
[10]
;
Yana Galarza, J.
[2]
Total Authors: 13
|
| Affiliation: | [1] Inst Nacl Pesquisas Espaciais, Div Astrofis, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos - Brazil
[2] Univ Sao Paulo, Dept Astron, IAG, Rua Matao 1226, BR-05509900 Sao Paulo - Brazil
[3] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 - USA
[4] Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800 - Australia
[5] Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 2611 - Australia
[6] Observ Univ Geneve, 51 Chemin Maillettes, CH-1290 Versoix - Switzerland
[7] Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 - USA
[8] Tacoma Community Coll, 6501 South 19th St, Tacoma, WA 98466 - USA
[9] Georg August Univ Gottingen, Inst Astrophys, Wilhelmspl 1, D-37073 Gottingen - Germany
[10] Univ Fed Rio Grande do Sul, Inst Fis, Ave Bento Goncalves 9500, Porto Alegre, RS - Brazil
Total Affiliations: 10
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 482, n. 2, p. 1690-1700, JAN 2019. |
| Web of Science Citations: | 1 |
| 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 Galaxy's 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 Thu\_line present at 4019.1290 angstrom, using very high resolution (R = 115000) 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). (AU) | |
| FAPESP's process: | 12/24392-2 - High precision spectroscopy: impact in the study of planets, stars, the galaxy and cosmology |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |