The Super-Puff WASP-193b is On A Well-Aligned Orbit
Samuel W. Yee, Gudmundur Stefansson, Daniel Thorngren, Andy Monson,, Joel D. Hartman, David B. Charbonneau, Johanna K. Teske, R. Paul Butler,, Jeffrey D. Crane, David Osip, and Stephen A. Shectman

TL;DR
This paper presents detailed measurements of the super-puff planet WASP-193b, revealing it has a well-aligned orbit and a composition consistent with a metal-H/He mix, contributing to understanding the diversity of super-puff formation.
Contribution
It provides the first measurement of a well-aligned orbit for a Jupiter-sized super-puff, challenging previous assumptions about their dynamical histories.
Findings
WASP-193b is a low-density, Jupiter-sized super-puff.
The planet's orbit is well-aligned with its host star.
Interior models suggest a metal-H/He composition.
Abstract
The "super-puffs" are a population of planets that have masses comparable to that of Neptune but radii similar to Jupiter, leading to extremely low bulk densities () that are not easily explained by standard core accretion models. Interestingly, several of these super-puffs are found in orbits significantly misaligned with their host stars' spin axes, indicating past dynamical excitation that may be connected to their low densities. Here, we present new Magellan/PFS RV measurements of WASP-193, a late F star hosting one of the least dense transiting planets known to date (, , ). We refine the bulk properties of WASP-193 b and use interior structure models to determine that the planet can be explained if it…
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Taxonomy
TopicsSpacecraft and Cryogenic Technologies · Spacecraft Dynamics and Control · Space Satellite Systems and Control
