From the first stars to planets
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1 High precision stellar spectroscopy: From the first stars to planets Jorge Meléndez Departamento de Astronomia, IAG, Universidade de São Paulo
2 My group: SAMPA Stellar Atmospheres, Planets & Abundances
3 IAG/USP Stellar Atmospheres, Planets & Abundances
4 16 refereed SAMPA international publications in 2016 using high resolution spectroscopy
5 Spectroscopy Espectro solar Dark lines in the spectrum of the Sun and stars Hydrogen atom p 1 2 3
6 Stellar spectrum: chemical composition, temperature, luminosity, rotation, stellar activity, planets
7 What is the origin of the chemical elements? How our galaxy evolved? How planets form and evolve?
8 time Evolution of our universe First 3 minutes: H, He, Li 13,7 billion years Big Bang
9 Relative flux From the first stars to the Sun: chemical evolution Sun: [Fe/H] = 0 solar metallicity CD : [Fe/H] = - 4 (10-4 solar) HE : [Fe/H] = Population III: [Fe/H] = - Wavelength credits: N. Christlieb 9
10 Star with [Fe/H] = -3 (a thousand times more metal-poor than Sun) Asplund & Melendez (2008)
11 time Evolution of our universe Era of galaxies 13,7 billion years Big Bang
12 Chemical evolution of the elements From H and He to metals
13 Interstellar medium Evolution of chemical elements in our Galaxy H, He stars Ejecta is rich in metais
14 Discovery of the brightest ultra metal-poor star using the ESO La Silla Observatory in Chile Melendez et al. (2016)
15
16 Stellar Populations - Thin disk, Thick disk - Bulge - Halo - Globular Clusters, Open Clusters
17 How common is our Sun? How common is our solar system? How can we find Earth 2.0?
18 Solar twins: stars with properties very similar to our Sun (temperature, luminosity, chemical composition)
19 Δ abundance: Sun - <twins> vs. atomic number Z Sun typical : Δ = 0 Sun weird : Δ 0 Our solar system is not host by a typical Sun Meléndez, Asplund, Gustafsson, Yong. 2009
20 Sun s anomalies are strongly correlated to the dust condensation temperature of the elements! Correlation is highly significant probability ~10-9 to happen by chance It s most likely to win the lottery ~ 0.08 dex ~ 20% Dust condensation temperature (K) Meléndez, Asplund, Gustafsson, Yong. 2009
21 Condensation Condensation in the solar nebula Mercury Venus
22 Meléndez et al The missing refractories were used to form dust, planetesimals & terrestrial planets The late accreted gas in the convection zone was deficient in refractories
23 Link between chemical composition & planets Finding planets around solar twins Large Programme: 100 nights at La Silla 3.6m telescope + HARPS spectrograph
24 Mercury Venus Earth Mars Solar System Jupiter Jupiter twin in HIP HIP 11915b
25 HIP Star is very similar to the Sun in physical properties AND chemical composition Sol HIP Composition adequate to form rocky planets! Mg Cr
26 Meléndez et al Sun is deficient in chemical elements that are abundant in rocky planets HIP may have rocky planets because chemical composition like the Sun!
27 HIP 11915: candidate for solar system twin!?
28 Super-Earth Earth Solar System Neptune Super Neptune Planetary system in HIP 68468
29 Planet engulfment Star HIP shows chemical signatures of planet engulfment
30 Slower rotator Faster rotator dos Santos et al. A&A 592, A156
31 Evolution of rotation in Sun-like stars v = 1.2 ± ± 0.4 t -0.6±0.3 dos Santos et al. A&A 592, A156
32 11-year activity cycle in the Sun. X-rays by Yohkoh 8/1991 9/2001
33 Ca II H and K lines have emission from the chromosphere, sensitive to magnetic activity Sun in Ha
34 S index Activity cycle from chromospheric index S Baliunas et al ApJ 438, 269
35 Long-term (billion of years) evolution of magnetic stellar activity in Sun-like stars Freitas et al. 2017
36 How to detect Earth 2.0? Current instrumentation: precision of 1m/s Earth s effect on the Sun: 9 cm/s Challenges: stellar noise (mainly magnetic activity)
37 37
38 SAMPA research areas - Discovery of primitive metal-poor stars - Chemical evolution of our galaxy - Fundamental properties of stars (chemical composition, age, mass) - Rotation and stellar magnetic activity - Discovery of planetary systems in solar twins - The search for Earth 2.0
39 Thanks!
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