NGTS-8b 与 NGTS-9b：两颗非膨胀热木星
地球与行星天体物理
2019-11-11 v1 太阳与恒星天体物理
摘要
我们报告由下一代凌星巡天（NGTS）发现的两颗热木星 NGTS-8b 和 NGTS-9b。它们分别绕转一颗 V = 13.68 的 K0V 恒星（Teff = 5241 +/- 50 K，周期 2.49970 天）和一颗 V = 12.80 的 F8V 恒星（Teff = 6330 +/- 130 K，周期 4.43527 天）。凌星由 SAAO 1.0-m 和 Euler 望远镜的后续测光观测独立验证，并利用 HARPS、FEROS 和 CORALIE 径向速度我们给出了行星参数。NGTS-8b 的质量为 0.93 +0.04 -0.03 MJ，半径为 1.09 +/- 0.03 RJ，与木星相近，密度为 0.89 +0.08 -0.07 g cm-3。这与 NGTS-9b 形成对比，后者质量为 2.90 +/- 0.17 MJ，半径为 1.07 +/- 0.06 RJ，密度大得多，为 2.93 +0.53 -0.49 g cm-3。从统计上看，这些行星参数将两者置于预期呈现大于预测半径的 regime。然而，我们发现它们的半径与理论非膨胀模型的预测一致。
引用
@article{arxiv.1911.02814,
title = {NGTS-8b and NGTS-9b: two non-inflated hot-Jupiters},
author = {Jean C. Costes and Christopher A. Watson and Claudia Belardi and Ian P. Braker and Matthew R. Burleigh and Sarah L. Casewell and Philipp Eigmüller and Maximilian N. Günther and James A. G. Jackman and Louise D. Nielsen and Maritza G. Soto and Oliver Turner and David R. Anderson and Daniel Bayliss and François Bouchy and Joshua T. Briegal and Edward M. Bryant and Juan Cabrera and Alexander Chaushev and Szilard Csizmadia and Anders Erikson and Samuel Gill and Edward Gillen and Michael R. Goad and Matthew J. Hooton and James S. Jenkins and James McCormac and Maximiliano Moyano and Didier Queloz and Heike Rauer and Liam Raynard and Alexis M. S. Smith and Andrew P. G. Thompson and Rosanna H. Tilbrook and Stephane Udry and Jose I. Vines and Richard G. West and Peter J. Wheatley},
journal= {arXiv preprint arXiv:1911.02814},
year = {2019}
}
备注
12 pages, 7 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society