Measuring Hot Jupiter Occurrence Rates in High-Alpha Stellar Populations with DECam

Wednesday, 07 June 2023 8 a.m. — 9 a.m. MST

AURA Lecture Hall

NOIRLab South Colloquia
Alison Crisp (Louisiana State University)

Though the giant planet formation rate is known to be strongly correlated with metallicity, the specific elements that cause the correlation are yet unknown.  Some low-metallicity stellar populations such as the Galactic thick disk appear to have higher occurrence rates of giant planets than are expected from their metallicities alone. One possible reason for this relative enhancement in occurrence rate is that the abundance of alpha elements, [α/H] = [α/Fe] + [Fe/H], is higher for low-metallicity thick disk stars than for thin disk stars at the same metallicity. We are performing the Multi-band Imaging Survey for High-Alpha PlanetS (MISHAPS) to probe this potential solution. MISHAPS uses DECam to survey both the high-metallicity, high-alpha Galactic bulge, and the low-metallicity, high-alpha globular clusters 47 Tuc and Omega Cen to detect hot Jupiters and characterize their host stars. The end goal of the survey is to estimate the hot Jupiter occurrence rates for these regions and compare them to planet occurrence rates measured in the local thin disk. Here, I will present an overview of MISHAPS, the results of our preliminary analyses of the data, and some ideas for what else the data may be useful for.