Influence of planet formation in the chemical composition of solar type stars

• Grant number: 10/17510-3
• Support Opportunities: Regular Research Grants
• Start date: April 01, 2011
• End date: March 31, 2013
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
• Principal Investigator: Jorge Luis Melendez Moreno
• Grantee: Jorge Luis Melendez Moreno
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

This project intends (i) to determine chemical abundances at high precision of both refractory and volatile elements in solar twins as signatures of terrestrial planet formation, in order to better understand the formation of planetary systems like our own; (ii) to determine lithium abundances to study its relation to the presence of giant planets, secular depletion or episodic accretion in the final stages of star formation; (iii) to study both metal-poor and metal-rich solar analogs to understand the influence of metallicity on planet formation; (iv) to determine whether giant stars with planets are metal-rich (or not) to get clues on the metallicity enhancement of stars with planets; (v) to study in detail the physical properties of solar twins using diverse techniques (interferometry, asteroseismology, astrometry, photometry) to verify the results obtained from purely spectroscopic techniques; (vi) to determine atmospheric parameters of a large sample of stars to improve the temperature scale of F-G-K stars. (AU)

Scientific publications

(9)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

PACE, G.; CASTRO, M.; MELENDEZ, J.; THEADO, S.; DO NASCIMENTO, JR., J. -D.. Lithium in M 67: From the main sequence to the red giant branch. Astronomy & Astrophysics, v. 541, MAY 2012. (10/17510-3)

RAMIREZ, I.; MELENDEZ, J.; CHANAME, J.. OXYGEN ABUNDANCES IN LOW- AND HIGH-alpha FIELD HALO STARS AND THE DISCOVERY OF TWO FIELD STARS BORN IN GLOBULAR CLUSTERS. ASTROPHYSICAL JOURNAL, v. 757, n. 2, OCT 1 2012. (10/17510-3)

CASAGRANDE, L.; RAMIREZ, I.; MELENDEZ, J.; ASPLUND, M.. THE INFRARED COLORS OF THE SUN. ASTROPHYSICAL JOURNAL, v. 761, n. 1, DEC 10 2012. (10/17510-3)

MELENDEZ, J.; BERGEMANN, M.; COHEN, J. G.; ENDL, M.; KARAKAS, A. I.; RAMIREZ, I.; COCHRAN, W. D.; YONG, D.; MACQUEEN, P. J.; KOBAYASHI, C.; et al. The remarkable solar twin HIP 56948: a prime target in the quest for other Earths. Astronomy & Astrophysics, v. 543, JUL 2012. (10/17510-3)

RAMIREZ, I.; MELENDEZ, J.; CORNEJO, D.; ROEDERER, I. U.; FISH, J. R.. ELEMENTAL ABUNDANCE DIFFERENCES IN THE 16 CYGNI BINARY SYSTEM: A SIGNATURE OF GAS GIANT PLANET FORMATION?. ASTROPHYSICAL JOURNAL, v. 740, n. 2, OCT 20 2011. (10/17510-3)

DO NASCIMENTO, JR., J. -D.; TAKEDA, Y.; MELENDEZ, J.; DA COSTA, J. S.; PORTO DE MELLO, G. F.; CASTRO, M.. THE FUTURE OF THE SUN: AN EVOLVED SOLAR TWIN REVEALED BY CoRoT. Astrophysical Journal Letters, v. 771, n. 2, JUL 10 2013. (12/24392-2, 10/17510-3)

RAMIREZ, I.; MICHEL, R.; SEFAKO, R.; TUCCI MAIA, M.; SCHUSTER, W. J.; VAN WYK, F.; MELENDEZ, J.; CASAGRANDE, L.; CASTILHO, B. V.. THE UBV(RI)(C) COLORS OF THE SUN. ASTROPHYSICAL JOURNAL, v. 752, n. 1, JUN 10 2012. (10/17510-3)

KISELMAN, D.; PEREIRA, T. M. D.; GUSTAFSSON, B.; ASPLUND, M.; MELENDEZ, J.; LANGHANS, K.. Is the solar spectrum latitude-dependent? An investigation with SST/TRIPPEL. Astronomy & Astrophysics, v. 535, NOV 2011. (10/17510-3)

YONG, DAVID; MELENDEZ, JORGE; GRUNDAHL, FRANK; ROEDERER, IAN U.; NORRIS, JOHN E.; MILONE, A. P.; MARINO, A. F.; COELHO, P.; MCARTHUR, BARBARA E.; LIND, K.; et al. High precision differential abundance measurements in globular clusters: chemical inhomogeneities in NGC 6752. Monthly Notices of the Royal Astronomical Society, v. 434, n. 4, p. 3542-3565, OCT 2013. (08/58406-4, 12/24392-2, 10/17510-3)