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High precision spectroscopy: from the first stars to planets

Grant number: 18/04055-8
Support type:Research Projects - Thematic Grants
Duration: December 01, 2018 - November 30, 2023
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal Investigator:Jorge Luis Melendez Moreno
Grantee:Jorge Luis Melendez Moreno
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Co-Principal Investigators:Adriana Benetti Marques Valio ; Alex Cavaliéri Carciofi
Assoc. researchers: Andrea Paola Buccino ; Diego Lorenzo de Oliveira ; Diogo Martins Souto ; Gustavo Andres Guerrero Eraso ; Luan Ghezzi Ferreira Pinho ; Marcelo Tucci Maia ; Sydney Agnello Barnes
Associated scholarship(s):20/08098-3 - Stellar activity and its effects on planetary transits, BP.IC
20/04445-0 - Dynamic contextualization of a be star sample observed by tess using spectroscopic analysis, BP.IC
19/20319-8 - Modeling spectroscopic signatures of stellar activity, BP.PD
+ associated scholarships 19/19208-7 - A new sample for the search of habitable planets, BP.IC
19/09249-8 - Exoplanet detection, BP.IC
19/02746-6 - Spectroscopic signatures of stellar activity, BP.IC
16/20667-8 - Stellar chronometers: the relation between age, chromospheric activity, rotation and lithium abundances in solar-type stars, BP.PD - associated scholarships

Abstract

This 5-year project intends to apply high precision spectroscopy to study important problems in exoplanet science, stellar astrophysics and the Galaxy. Stars will be characterized using the line-by-line differential technique, in order to obtain precise chemical abundances with small errors of 0.01 - 0.02 in solar-metallicity stellar twins, or about 0.03 - 0.05 dex in metal-poor stars. Furthermore, our technique will provide high precision stellar parameters, which are important for the determination of precise differential masses and ages. Our high precision chemical abundances will be useful to study how the chemical elements evolved from a purely primordial Big Bang composition to a metal-enriched Milky Way populated with planets like our own. We will also search for exoplanets using ultra-precise radial velocities (20 cm s-1 to 1 m s-1), with existing facilities and also new spectrographs such as SORCERESS, for which we are requesting partial funding. We will make important efforts to model stellar activity, both to understand how magnetic activity evolves in stars, but also because the stellar activity "noise" limits our ability to detect small planets. The precise parameters and chemical composition of stellar twins and binaries will be key to study in detail the connection between stars and planet formation and evolution. Finally, we will study how the stellar composition is related to the composition of exoplanet atmospheres, by characterizing stars with transiting planets and also studying their planetary atmospheres using ground-based and future space-based missions. (AU)

Scientific publications (12)
(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)
DOS SANTOS, LEONARDO A.; EHRENREICH, DAVID; BOURRIER, VINCENT; ALLART, ROMAIN; KING, GEORGE; LENDL, MONIKA; LOVIS, CHRISTOPHE; MARGHEIM, STEVE; MELENDEZ, JORGE; SEIDEL, JULIA V.; SOUSA, SERGIO G. Search for helium in the upper atmosphere of the hot Jupiter WASP-127 b using Gemini/Phoenix. Astronomy & Astrophysics, v. 640, AUG 5 2020. Web of Science Citations: 0.
LIU, F.; YONG, D.; ASPLUND, M.; WANG, H. S.; SPINA, L.; ACUNA, L.; MELENDEZ, J.; RAMIREZ, I. Detailed chemical compositions of planet-hosting stars - I. Exploration of possible planet signatures. Monthly Notices of the Royal Astronomical Society, v. 495, n. 4, p. 3961-3973, JUL 2020. Web of Science Citations: 0.
LORENZO-OLIVEIRA, DIEGO; MELENDEZ, JORGE; PONTE, GEISA; GALARZA, JHON YANA. The ancient main-sequence solar proxy HIP 102152 unveils the activity and rotational fate of our Sun. Monthly Notices of the Royal Astronomical Society, v. 495, n. 1, p. L61-L65, JUN 2020. Web of Science Citations: 0.
SPINA, LORENZO; NORDLANDER, THOMAS; CASEY, ANDREW R.; BEDELL, MEGAN; D'ORAZI, VALENTINA; MELENDEZ, JORGE; KARAKAS, I, AMANDA; DESIDERA, SILVANO; BARATELLA, MARTINA; YANA GALARZA, JHON J.; CASALI, GIADA. How Magnetic Activity Alters What We Learn from Stellar Spectra. ASTROPHYSICAL JOURNAL, v. 895, n. 1 MAY 2020. Web of Science Citations: 0.
CARLOS, MARILIA; MELENDEZ, JORGE; DO NASCIMENTO, JR., JOSE-DIAS; CASTRO, MATTHIEU. Li abundances for solar twins in the open cluster M67. Monthly Notices of the Royal Astronomical Society, v. 492, n. 1, p. 245-249, FEB 2020. Web of Science Citations: 0.
RAMIREZ, I.; KHANAL, S.; LICHON, S. J.; CHANAME, J.; ENDL, M.; MELENDEZ, J.; LAMBERT, D. L. The chemical composition of HIP 34407/HIP 34426 and other twin-star comoving pairs. Monthly Notices of the Royal Astronomical Society, v. 490, n. 2, p. 2448-2457, DEC 2019. Web of Science Citations: 0.
GALARZA, JHON YANA; MELENDEZ, JORGE; LORENZO-OLIVEIRA, DIEGO; VALIO, ADRIANA; REGGIANI, HENRIQUE; CARLOS, MARILIA; PONTE, GEISA; SPINA, LORENZO; HAYWOOD, RAPHAELLE D.; GANDOLFI, DAVIDE. The effect of stellar activity on the spectroscopic stellar parameters of the young solar twin HIP 36515. Monthly Notices of the Royal Astronomical Society, v. 490, n. 1, p. L86-L90, NOV 2019. Web of Science Citations: 0.
TUCCI MAIA, M.; MELENDEZ, J.; LORENZO-OLIVEIRA, D.; SPINA, L.; JOFRE, P. Revisiting the 16 Cygni planet host at unprecedented precision and exploring automated tools for precise abundances. Astronomy & Astrophysics, v. 628, AUG 20 2019. Web of Science Citations: 0.
REGGIANI, HENRIQUE; AMARSI, ANISH M.; LIND, KARIN; BARKLEM, PAUL S.; ZATSARINNY, OLEG; BARTSCHAT, KLAUS; FURSA, V, DMITRY; BRAY, IGOR; SPINA, LORENZO; MELENDEZ, JORGE. Non-LTE analysis of K I in late-type stars. Astronomy & Astrophysics, v. 627, JUL 22 2019. Web of Science Citations: 0.
LIU, F.; ASPLUND, M.; YONG, D.; FELTZING, S.; DOTTER, A.; MELENDEZ, J.; RAMIREZ, I. Chemical (in)homogeneity and atomic diffusion in the open cluster M67. Astronomy & Astrophysics, v. 627, JUL 10 2019. Web of Science Citations: 3.
CARLOS, M.; MELENDEZ, J.; SPINA, L.; DOS SANTOS, L. A.; BEDELL, M.; RAMIREZ, I.; ASPLUND, M.; BEAN, J. L.; YONG, D.; YANA GALARZA, J.; ALVES-BRITO, A. The Li-age correlation: the Sun is unusually Li deficient for its age. Monthly Notices of the Royal Astronomical Society, v. 485, n. 3, p. 4052-4059, MAY 2019. Web of Science Citations: 1.
LORENZO-OLIVEIRA, DIEGO; MELENDEZ, JORGE; GALARZA, JHON YANA; PONTE, GEISA; DOS SANTOS, LEONARDO A.; SPINA, LORENZO; BEDELL, MEGAN; RAMIREZ, IVAN; BEAN, JACOB L.; ASPLUND, MARTIN. Constraining the evolution of stellar rotation using solar twins. Monthly Notices of the Royal Astronomical Society, v. 485, n. 1, p. L68-L72, MAY 2019. Web of Science Citations: 1.

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