ExoExplorer Science Series: Leonardo dos Santos (STScI) & Quadry Chance (U Florida)

The ExoExplorer Science Series presents talks by cohort members Leonardo dos Santos (STScI) & Quadry Chance (U Florida) on February 18, 2022, from 11 AM - 12 PM Pacific / 2 PM - 3 PM Eastern. Connection information is below.

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Speaker: Leonardo dos Santos (STScI)

Title: An open-source framework to plan and interpret observations of atmospheric escape in exoplanets

Abstract: The last couple of years has seen a significant increase in detections of evaporating exoplanets, owing mainly to the discovery of the metastable helium as a probe for atmospheric escape. This process is thought to be an important factor to explain features in the exoplanet population, such as the hot-Neptune desert and the radius valley. While part of exoplanet community, in general, enjoys a swath of open-source codes that help them plan and interpret observations, the same cannot be said about those who study atmospheric escape. At least, not until recently. We developed a new open-source code, named p-winds, with the objective of supplying the community with an easy to use, well-documented tool designed for observations of evaporating exoplanets. In this talk, I will discuss the motivation, implementation, and use cases for p-winds. I will also briefly discuss some recent results that benefitted from this code, and future plans in sight.

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Speaker: Quadry Chance (U Florida)

Title: Toward a binary probability for every known exoplanet host star: a statistical framework with Gaia

Abstract: The effect of stellar multiplicity on planet formation remains an open question. Investigations carried out using high-resolution imaging and constraints from RV planet searches have indicated that planet formation can be disrupted by close binaries while being relatively unaffected by wide companions. The magnitude and distance-limited nature of those tools have left unexplored companion parameter space in our best planet sample, the Kepler survey. The Early Data Release 3 (EDR3) from the Gaia Mission includes RV measurements of over 7 million targets that can be used to probe this parameter space. Many of these stars are members of unresolved multiple star systems and the effects of these orbits are generally seen as a source of contamination in the Gaia RV catalog. We will demonstrate that the published RV error estimates can provide evidence for the existence of an unresolved stellar companion for Kepler (and other) planet hosts and place constraints on their orbital parameters.

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