HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star
Article
Zhou, George. 2023. "HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star." The Astronomical Journal. 165 (6). https://doi.org/10.3847/1538-3881/acd197
Article Title | HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Zhou, George |
Journal Title | The Astronomical Journal |
Journal Citation | 165 (6) |
Article Number | 268 |
Number of Pages | 13 |
Year | 2023 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/acd197 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/acd197/meta |
Abstract | We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. HIP 33609 b is a large (R b = 1.580 ? 0.070 + 0.074 R J) brown dwarf on a highly eccentric (e = 0.560 ? 0.031 + 0.029 ) orbit with a 39 days period. The host star is a bright (V = 7.3 mag), T eff = 10,400 ? 660 + 800 K star with a mass of M * = 2.383 ? 0.095 + 0.10 M ? and radius of R * = 1.863 ? 0.082 + 0.087 R ?, making it the hottest transiting brown dwarf host star discovered to date. We obtained radial velocity measurements from the CHIRON spectrograph confirming the companion's mass of M b = 68.0 ? 7.1 + 7.4 M J as well as the host star's rotation rate ( v sin i * = 55.6 ± 1.8 km s?1). We also present the discovery of a new comoving group of stars, designated as MELANGE-6, and determine that HIP 33609 is a member. We use a combination of rotation periods and isochrone models fit to the cluster members to estimate an age of 150 ± 25 Myr. With a measured mass, radius, and age, HIP 33609 b becomes a benchmark for substellar evolutionary models. © 2023. The Author(s). Published by the American Astronomical Society. |
Keywords | Exoplanets; Brown dwarf; Young star clusters ; CCD photometry; High resolution spectroscopy; Exoplanet evolution |
ANZSRC Field of Research 2020 | 510199. Astronomical sciences not elsewhere classified |
Byline Affiliations | University of Southern Queensland |
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https://research.usq.edu.au/item/z2709/hip-33609-b-an-eccentric-brown-dwarf-transiting-a-v-7-3-rapidly-rotating-b-star
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