@article{48e4b18d8c8f43f4b10a5900f9d6a7e2,
title = "HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star",
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.",
author = "Noah Vowell and Rodriguez, {Joseph E.} and Quinn, {Samuel N.} and George Zhou and Andrew Vanderburg and Mann, {Andrew W.} and Hooton, {Matthew J.} and Stassun, {Keivan G.} and Saburo Howard and Allyson Bieryla and Latham, {David W.} and Howell, {Steve B.} and Tristan Guillot and Carl Ziegler and Collins, {Karen A.} and Carmichael, {Theron W.} and Jenkins, {Jon M.} and Avi Shporer and Lyu Abe and Philippe Bendjoya and Bush, {Jonathan L.} and Marco Buttu and Collins, {Kevin I.} and Eastman, {Jason D.} and Fields, {Matthew J.} and Thomas Gasparetto and G{\"u}nther, {Maximilian N.} and Kostov, {Veselin B.} and Kraus, {Adam L.} and Lester, {Kathryn V.} and Levine, {Alan M.} and Colin Littlefield and Wenceslas Marie-Sainte and Djamel M{\'e}karnia and Osborn, {Hugh P.} and David Rapetti and Ricker, {George R.} and S. Seager and Ramotholo Sefako and Gregor Srdoc and Olga Suarez and Guillermo Torres and Triaud, {Amaury H.M.J.} and R. Vanderspek and Winn, {Joshua N.}",
note = "Funding Information: A.W.M. was supported by a grant from NASA{\textquoteright}s Exoplanet research program (80NSSC21K0393). D.R. was supported by NASA under award number NNA16BD14C. Funding Information: Some of the observations in the paper made use of the High-Resolution Imaging instrument Zorro obtained under Gemini LLP Proposal Number: GN/S-2021A-LP-105. Zorro was funded by the NASA Exoplanet Exploration Program and built at the NASA Ames Research Center by Steve B. Howell, Nic Scott, Elliott P. Horch, and Emmett Quigley. Zorro was mounted on the Gemini North (and/or South) telescope of the international Gemini Observatory, a program of NSF's OIR Lab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. on behalf of the Gemini partnership: the National Science Foundation (United States), National Research Council (Canada), Agencia Nacional de Investigaci{\'o}n y Desarrollo (Chile), Ministerio de Ciencia, Tecnolog{\'i}a e Innovaci{\'o}n (Argentina), Minist{\'e}rio da Ci{\^e}ncia, Tecnologia, Inova{\c c}{\~o}es e Comunica{\c c}{\~o}es (Brazil), and Korea Astronomy and Space Science Institute (Republic of Korea). Funding Information: Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST) at the Space Telescope Science Institute. The specific observations analyzed can be accessed via DOI:10.17909/t9-nmc8-f686 and DOI:10.17909/0cp4-2j79. Funding Information: Funding for the TESS mission is provided by NASA{\textquoteright}s Science Mission Directorate. We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. This research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This paper includes data collected by the TESS mission that are publicly available from MAST. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Funding Information: This research received funding from the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation program (grant agreement No. 803193/BEBOP), and from the Science and Technology Facilities Council (STFC; grant No. ST/S00193X/1). Funding Information: This work makes use of observations from the ASTEP telescope. ASTEP benefited from the support of the French and Italian polar agencies IPEV and PNRA in the framework of the Concordia station program, from OCA, INSU, Idex UCAJEDI (ANR- 15-IDEX-01), the University of Birmingham, and ESA. Funding Information: This work has been carried out within the framework of the NCCR PlanetS supported by the Swiss National Science Foundation under grants 51NF40_182901 and 51NF40_205606. Funding Information: This work makes use of observations from the LCOGT network. Part of the LCOGT telescope time was granted by NOIRLab through the Mid-Scale Innovations Program (MSIP). MSIP is funded by NSF. Publisher Copyright: {\textcopyright} 2023. The Author(s). Published by the American Astronomical Society.",
year = "2023",
month = jun,
day = "1",
doi = "10.3847/1538-3881/acd197",
language = "English (US)",
volume = "165",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "6",
}