NGTS-4b：一颗在沙漠中凌星的次海王星
地球与行星天体物理
2019-05-01 v1
摘要
我们报告发现 NGTS-4b，一颗次海王星大小的行星，在一颗 13 等的 K 型矮星轨道上以 1.34 天周期凌星。NGTS-4b 的质量 M=M_E，半径 R=R_E，这使其完全位于所谓的“海王星沙漠”之中。该行星的平均密度（g/cm^3）与 100% HO 的组成或具有挥发性包层的岩石核心相一致。NGTS-4b 可能因相对较强的 EUV/X 射线辐照而遭受显著的质量损失。它在海王星沙漠中的存活可能是由于异常高的核心质量，或者它可能在其宿主恒星初始活动消退后通过迁移避开了最强烈的 X 射线辐照。凭借 % 的凌星深度，NGTS-4b 代表了迄今从地面发现的凌星深度最浅的系统，也是广角地基测光巡天中发现的最小行星。
引用
@article{arxiv.1809.00678,
title = {NGTS-4b: A sub-Neptune Transiting in the Desert},
author = {Richard G. West and Edward Gillen and Daniel Bayliss and Matthew R. Burleigh and Laetitia Delrez and Maximilian N. Günther and Simon T. Hodgkin and James A. G. Jackman and James S. Jenkins and George King and James McCormac and Louise D. Nielsen and Liam Raynard and Alexis M. S. Smith and Maritza Soto and Oliver Turner and Peter J. Wheatley and Yaseen Almleaky and David J. Armstrong and Claudia Belardi and François Bouchy and Joshua T. Briegal and Artem Burdanov and Juan Cabrera and Sarah L. Casewel and Alexander Chaushev and Bruno Chazelas and Paul Chote and Benjamin F. Cooke and Szilard Csizmadia and Elsa Ducrot and Philipp Eigmüller and Anders Erikson and Emma Foxell and Boris T. Gänsicke and Michaël Gillon and Michael R. Goad and Emmanuël Jehin and Gregory Lambert and Emma S. Longstaff and Tom Louden and Maximiliano Moyano and Catriona Murray and Don Pollacco and Didier Queloz and Heike Rauer and Sandrine Sohy and Samantha J. Thompson and Stéphane Udry and Simon. R. Walker and Christopher A. Watson},
journal= {arXiv preprint arXiv:1809.00678},
year = {2019}
}
备注
Submitted to MNRAS