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HIP 33609 b: a highly eccentric transiting brown dwarf orbiting a B-star

Presentation #400.02 in the session Stellar Dynamics 2: Binaries.

Published onJul 01, 2023
HIP 33609 b: a highly eccentric transiting brown dwarf orbiting a B-star

The brown dwarf (BD) regime provides an exciting parameter space to probe planetary and stellar formation/evolution since it bridges the gap in mass between planets and stars. With that in mind, I will be discussing the discovery of a new transiting BD system, HIP 33609 b, one of the most extreme transiting BD yet discovered. HIP 33609 b is a highly eccentric, 68 MJ BD on a long 39 day period with a radius of 1.58 RJ. Its host star is a bright, rapidly rotating B-star with an effective temperature of 10,410 K, making it the hottest star to host a substellar companion. The host star is also a member of a newly discovered comoving group of stars with an age measurement of 150 Myr making this one of only a handful of transiting BD systems with a precisely measured mass, radius, and age. As such, HIP 33609 is a benchmark system for testing substellar evolutionary models, and is a prime target for future observations to perform detailed atmospheric characterization and spin-orbit alignment measurements.

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