Host star abundances, particularly refractory elements (e.g. Fe, Si, Mg), play an important role in connecting host stars to their planets. However, most Sun-like stars do not have refractory abundance measurements since obtaining a large sample of high-resolution spectra is difficult with oversubscribed observing resources. In this talk I will discuss how we infer 13 abundances, including 10 refractory elements, for several thousand sun-like stars with Gaia RVS spectra using The Cannon, a data-driven method. This yields abundances with average upper-limit precisions of 0.04-0.1 dex for 12,311 stars, 43 of which are identified planet hosts. We find no significant abundance differences between identified planet hosts and the rest of the sample. We also show the Sun remains relatively refractory depleted compared to other sun-like stars regardless of planet host status, refuting theories of planets locking up refractories. This work demonstrates the utility of data-driven learning for future exoplanet composition and demographics studies. 

Host: Bekki Dawson

Seminar held in 538 Davey or please email CEHW-SEMINAR-QUESTIONS@lists.psu.edu to attend virtually.