Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun

 

TalaWanda Monroe (IAG/USP)

 

The Sun appears deficient in refractory elements relative to volatile species, when compared to other solar twins.  Terrestrial planet formation may have imprinted a signature in the solar composition by locking-up refractory elements in the surrounding disk, and leaving behind material low in refractory elements to later accrete onto the Sun.  In this talk, I present the results of a detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152, using ultra high-resolution (R = 110,000), high S/N UVES spectra obtained on the 8.2-m VLT.  Elemental abundance ratios examined vs. dust condensation temperature reveal an abundance pattern for HIP 102152 that is the most similar to solar of any known solar twin.  The solar chemical pattern of HIP 102152 makes it a potential candidate to host terrestrial planets, which is reinforced by the lack of giant planets in its terrestrial planet region.  Additionally, in the context of the long-standing "lithium-mystery" of the Sun, I will discuss the Li abundance of HIP 102152 and the emerging tight Li-age depletion trend of solar twins studied at high-resolution.