HD219666b：一颗来自TESS第1扇区的热海王星
地球与行星天体物理
2019-04-03 v3 太阳与恒星天体物理
摘要
我们报告了一颗绕行年老且不活动的G7矮星HD219666(Mstar = 0.92 ± 0.03 MSun, Rstar = 1.03 ± 0.03 RSun, tau_star = 10 ± 2 Gyr)的凌星行星的确认与质量测定。HD219666b的质量Mb = 16.6 ± 1.3 MEarth、半径Rb = 4.71 ± 0.17 REarth、轨道周期P ~ 6天，是一类稀有系外行星——热海王星的新成员。凌星系外行星巡天卫星(Transiting Exoplanet Survey Satellite, TESS)在其第1扇区观测了HD219666(亦称TOI-118)，光变曲线显示出四次等时间间隔的凌星类事件。我们通过使用[email protected]获取精密视向速度测量确认了该候选体的行星性质。我们利用共加HARPS光谱推导了宿主星基本参数(Teff = 5527 ± 65 K, log g = 4.40 ± 0.11 (cgs), [Fe/H] = 0.04 ± 0.04 dex, log R'HK = -5.07 ± 0.03)，以及多种挥发与难熔元素的丰度。宿主星亮度(V = 9.9)使其适于通过凌星光谱进一步表征。该行星轨道倾角以及大气金属-氢含量与热结构的测定，可为我们提供关于此类天体形成机制的重要线索。
引用
@article{arxiv.1812.05881,
title = {HD219666b: A hot-Neptune from TESS Sector 1},
author = {M. Esposito and D. J. Armstrong and D. Gandolfi and V. Adibekyan and M. Fridlund and N. C. Santos and J. H. Livingston and E. Delgado Mena and L. Fossati and J. Lillo-Box and O. Barragán and D. Barrado and P. E. Cubillos and B. Cooke and A. B. Justesen and F. Meru and R. F. Díaz and F. Dai and L. D. Nielsen and C. M. Persson and P. J. Wheatley and A. P. Hatzes and V. Van Eylen and M. M. Musso and R. Alonso and P. Beck and S. C. C. Barros and D. Bayliss and A. S. Bonomo and F. Bouchy and D. J. A. Brown and E. Bryant and J. Cabrera and W. D. Cochran and S. Csizmadia and H. Deeg and O. Demangeon and M. Deleuil and X. Dumusque and P. Eigmüller and M. Endl and A. Erikson and F. Faedi and P. Figueira and A. Fukui and S. Grziwa and E. W. Guenther and D. Hidalgo and M. Hjorth and T. Hirano and S. Hojjatpanah and E. Knudstrup and J. Korth and K. W. F. Lam and J. de Leon and M. N. Lund and R. Luque and S. Mathur and P. Montañés Rodríguez and N. Narita and D. Nespral and P. Niraula and G. Nowak and H. P. Osborn and E. Pallé and M. Pätzold and D. Pollacco and J. Prieto-Arranz and H. Rauer and S. Redfield and I. Ribas and S. G. Sousa and A. M. S. Smith and M. Tala-Pinto and S. Udry and J. N. Winn},
journal= {arXiv preprint arXiv:1812.05881},
year = {2019}
}
备注
Accepted for publication in A&A