TOI-332 b：在Neptunian沙漠深处发现的一颗超高密度海王星
地球与行星天体物理
2023-08-24 v1
摘要
迄今为止，已发现数千颗行星，但轨道参数空间中仍有某些区域鲜有行星。一个例子是被称为Neptunian沙漠的短周期且中等质量/半径区域，这里的行星本应易于发现，但实际发现却很少。这表明居住于此的行星由不寻常的形成与演化过程所致。我们报告TOI-332 b的发现，这是一颗周期极短（ d）且稳居沙漠之中的行星。它环绕一颗有效温度 K的K0型矮星运行。TOI-332 b的半径为 R，小于海王星，但其质量异常大，达 M。其密度达 gcm，是迄今发现的任何海王星大小行星中最高的之一。一个四层内部结构模型表明，它很可能具有可忽略的氢-氦包层，这对于如此质量的行星仅有极少数具备，因而TOI-332 b对行星形成理论提出了有趣挑战。我们发现光致蒸发无法解释剥离该行星本应吸积的类似木星包层所需的质量损失。我们需要诉诸其他情形，如高偏心率迁移、巨碰撞或原行星盘中的缝形成，来试图解释这一不寻常的发现。
引用
@article{arxiv.2308.12137,
title = {TOI-332 b: a super dense Neptune found deep within the Neptunian desert},
author = {Ares Osborn and David J. Armstrong and Jorge Fernández Fernández and Henrik Knierim and Vardan Adibekyan and Karen A. Collins and Elisa Delgado-Mena and Malcolm Fridlund and João Gomes da Silva and Coel Hellier and David G. Jackson and George W. King and Jorge Lillo-Box and Rachel A. Matson and Elisabeth C. Matthews and Nuno C. Santos and Sérgio G. Sousa and Keivan G. Stassun and Thiam-Guan Tan and George R. Ricker and Roland Vanderspek and David W. Latham and Sara Seager and Joshua N. Winn and Jon M. Jenkins and Daniel Bayliss and Luke G. Bouma and David R. Ciardi and Kevin I. Collins and Knicole D. Colón and Ian J. M. Crossfield and Olivier D. S. Demangeon and Rodrigo F. Díaz and Caroline Dorn and Xavier Dumusque and Marcelo Aron Fetzner Keniger and Pedro Figueira and Tianjun Gan and Robert F. Goeke and Andreas Hadjigeorghiou and Faith Hawthorn and Ravit Helled and Steve B. Howell and Louise D. Nielsen and Hugh P. Osborn and Samuel N. Quinn and Ramotholo Sefako and Avi Shporer and Paul A. Strøm and Joseph D. Twicken and Andrew Vanderburg and Peter J. Wheatley},
journal= {arXiv preprint arXiv:2308.12137},
year = {2023}
}
备注
20 pages, 14 figures, 6 tables, accepted for publication in MNRAS