Kepler-78 and the Ultra-Short-Period Planets

Kavli Affiliate: Saul Rappaport

| First 5 Authors: Joshua N. Winn, Roberto Sanchis-Ojeda, Saul Rappaport, ,

| Summary:

Compared to the Earth, the exoplanet Kepler-78b has a similar size (1.2
$R_oplus$) and an orbital period a thousand times shorter (8.5 hours). It is
currently the smallest planet for which the mass, radius, and dayside
brightness have all been measured. Kepler-78b is an exemplar of the
ultra-short-period (USP) planets, a category defined by the simple criterion
$P_{rm orb} < 1$ day. We describe our Fourier-based search of the Kepler data
that led to the discovery of Kepler-78b, and review what has since been learned
about the population of USP planets. They are about as common as hot Jupiters,
and they are almost always smaller than 2 $R_oplus$. They are often members of
compact multi-planet systems, although they tend to have relatively large
period ratios and mutual inclinations. They might be the exposed rocky cores of
"gas dwarfs," the planets between 2-4 $R_oplus$ in size that are commonly
found in somewhat wider orbits.

| Search Query: ArXiv Query: search_query=au:”Saul Rappaport”&id_list=&start=0&max_results=10

Read More

Leave a Reply

Your email address will not be published.