Measuring the Galactic Distribution of Transiting Planets with WFIRST

TL;DR

The paper discusses how WFIRST will enable the detection and characterization of over 100,000 transiting planets across the galaxy, including hot Jupiters and small planets, through precise light curves and parallaxes.

Contribution

It introduces a novel approach combining WFIRST's microlensing and transit data to map planetary systems throughout the galaxy, including confirmation methods for various planet types.

Findings

Detection of over 100,000 transiting planets with measured distances

Confirmation of several thousand hot Jupiters via secondary eclipses

Potential validation of small planets through transit timing variations

Abstract

The WFIRST microlensing mission will measure precise light curves and relative parallaxes for millions of stars, giving it the potential to characterize short-period transiting planets all along the line of sight and into the galactic bulge. These light curves will enable the detection of more than 100,000 transiting planets whose host stars have measured distances. Although most of these planets cannot be followed up, several thousand hot Jupiters can be confirmed directly by detection of their secondary eclipses in the WFIRST data. Additionally, some systems of small planets may be confirmed by detecting transit timing variations over the duration of the WFIRST microlensing survey. Finally, many more planets may be validated by ruling out potential false positives. The combination of WFIRST transits and microlensing will provide a complete picture of planetary system architectures, from the very shortest periods to unbound planets, as a function of galactocentric distance.