HD 202772A B: A Transiting Hot Jupiter Around A Bright, Mildly Evolved Star In A Visual Binary Discovered By Tess

TL;DR

This paper confirms the discovery of a hot Jupiter, HD 202772A b, around a bright, mildly evolved star using TESS data and radial velocity measurements, highlighting its inflated size and strong irradiation.

Contribution

First confirmation of a hot Jupiter discovered by TESS around a bright, evolved star, with detailed mass, radius, and irradiation measurements.

Findings

Planet has a mass of approximately 1.008 Jupiter masses.

Planet's radius is about 1.562 Jupiter radii.

It is one of the most strongly irradiated hot Jupiters known.

Abstract

We report the first confirmation of a hot Jupiter discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HD 202772A b. The transit signal was detected in the data from TESS Sector 1, and was confirmed to be of planetary origin through radial-velocity measurements. HD 202772A b is orbiting a mildly evolved star with a period of 3.3 days. With an apparent magnitude of V = 8.3, the star is among the brightest known to host a hot Jupiter. Based on the 27days of TESS photometry, and radial velocity data from the CHIRON and HARPS spectrographs, the planet has a mass of 1.008+/-0.074 M_J and radius of 1.562+/-0.053 R_J , making it an inflated gas giant. HD 202772A b is a rare example of a transiting hot Jupiter around a quickly evolving star. It is also one of the most strongly irradiated hot Jupiters currently known.