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arXiv 2301.09663astro-ph.EPastro-ph.SR
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HIP 33609 b:一颗绕V=7.3快速旋转B型星凌星的偏心褐矮星

HIP 33609 b: An Eccentric Brown Dwarf Transiting a V=7.3 Rapidly Rotating B-Star

Noah Vowell, Joseph E. Rodriguez, Samuel N. Quinn, George Zhou, Andrew Vanderburg, Andrew W. Mann, Matthew J. Hooton, Keivan G. Stassun, Saburo Howard, Allyson … 展开作者

Noah Vowell, Joseph E. Rodriguez, Samuel N. Quinn, George Zhou, Andrew Vanderburg, Andrew W. Mann, Matthew J. Hooton, Keivan G. Stassun, Saburo Howard, Allyson Bieryla, David W. Latham, Steve B. Howell, Tristan Guillot, Carl Ziegler, Karen A. Collins, Theron W. Carmichael, Jon M. Jenkins, Avi Shporer, Lyu ABE, Philippe Bendjoya, Jonathan L. Bush, Marco Buttu, Kevin I. Collins, Jason D. Eastman, Matthew J. Fields, Thomas Gasparetto, Maximilian N. Günther, Veselin B. Kostov, Adam L. Kraus, Kathryn V. Lester, Alan M. Levine, Colin Littlefield, Wenceslas Marie-Saint, Djamel Mékarnia, Hugh P. Osborn, David Rapetti, George R. Ricker, S. Seager, Gregor Srdoc, Olga Suarez, Guillermo Torres, Amaury H. M. J. Triaud, R. Vanderspek, Joshua N. Winn

AI总结:

本研究借助TESS卫星发现绕最热凌星褐矮星宿主星运行的HIP 33609 b,测定其轨道、质量等参数,发现新共动群MELANGE-6并定出系统年龄,为亚恒星演化模型提供了基准天体。

摘要:

我们介绍了HIP 33609 b的发现与表征结果,这是一颗绕晚B型星运行的凌星温褐矮星,由NASA的凌日系外行星巡天卫星(Transiting Exoplanet Survey Satellite,TESS)以TOI-588 b的编号发现。HIP 33609 b是一颗体积较大的褐矮星,半径R_b = 1.580_{-0.070}^{+0.074} R_J,轨道周期为39天,轨道偏心率极高(e = 0.560_{-0.031}^{+0.029})。其宿主恒星亮度为V=7.3星等,有效温度T_eff = 10400_{-660}^{+800} K,质量M_* = 2.383_{-0.095}^{+0.10} M_☉,半径R_* = 1.863_{-0.082}^{+0.087} R_☉,是迄今发现的最热的凌星褐矮星宿主恒星。我们通过CHIRON光谱仪获取了视向速度测量数据,确认该伴星质量M_b = 68.0_{-7.1}^{+7.4} M_J,同时测得宿主恒星的自转速率(vsini_* = 55.6 ± 1.8 km/s)。我们还发现了一个新的共动恒星群,命名为MELANGE-6,并确定HIP 33609是其成员。结合星团成员的自转周期和等时线模型拟合,我们估算该星团年龄为150 ± 25 Myr。凭借已测得的质量、半径和年龄,HIP 33609 b成为亚恒星演化模型的基准天体。

英文摘要:

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 TESS 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-day 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$_{\odot}$ and radius of R$_{*}$ = 1.863$_{-0.082}^{+0.087}$ R$_{\odot}$, 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 ($vsini_{*} = 55.6 \pm 1.8$ km/s). 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 $\pm$ 25 Myr. With a measured mass, radius, and age, HIP 33609 b becomes a benchmark for substellar evolutionary models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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