EBLM 项目——IX. 五颗全对流 M 型矮星利用 CHEOPS 与 TESS 光变曲线精确测量
太阳与恒星天体物理
2022-09-21 v1 地球与行星天体物理
摘要
食双星是检验和校准恒星结构与演化模型的重要基准对象。对于含有全对流 M 型矮星组分的双星而言尤其如此，因为利用其他技术直接测量这些恒星的质量和半径较为困难。鉴于 M 型矮星作为系外行星宿主星的潜力，其半径和有效温度随质量变化的理论预测精度是一个活跃的讨论话题。不仅系外行星的参量，未来大气表征的成败也依赖于准确理论预测。我们呈现了对 23 个样本中的五颗含低质量恒星伴星的食双星的分析，为此我们利用 CHEOPS 卫星获得了超高精度的光变曲线。将其初食与次食的观测与光谱测量相结合，使用 PYCHEOPS 数据分析软件精确建模主星参数并推导 M 型矮星的质量、半径、表面重力和有效温度估计值。将这些结果与由 TESS 光变曲线导出的同一组参数相比较，我们发现一致性极好（半径优于 1%，表面重力优于 0.2%）。我们还分析了径向速度测量所得精确轨道的重要性，发现它们对于在 5% 精度以下 regime 推导 M 型矮星半径至关重要。这些结果向全对流 M 型矮星的质量-半径图增添了五个有价值的数据点。
引用
@article{arxiv.2209.03128,
title = {The EBLM project -- IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves},
author = {D. Sebastian and M. I. Swayne and P. F. L. Maxted and A. H. M. J. Triaud and S. G. Sousa and G. Olofsson and M. Beck and N. Billot and S. Hoyer and S. Gill and N. Heidari and D. V. Martin and C. M. Persson and M. R. Standing and Y. Alibert and R. Alonso and G. Anglada and J. Asquier and T. Bárczy and D. Barrado and S. C. C. Barros and M. P. Battley and W. Baumjohann and T. Beck and W. Benz and M. Bergomi and I. Boisse and X. Bonfils and A. Brandeker and C. Broeg and J. Cabrera and S. Charnoz and A. Collier Cameron and Sz. Csizmadia and M. B. Davies and M. Deleuil and L. Delrez and O. D. S. Demangeon and B. -O. Demory and G. Dransfield and D. Ehrenreich and A. Erikson and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. Güdel and J. Hasiba and G. Hébrard and K. Heng and K. G. Isaak and L. L. Kiss and E. Kopp and V. Kunovac and J. Laskar and A. Lecavelier des Etangs and M. Lendl and C. Lovis and D. Magrin and J. McCormac and N. J. Miller and V. Nascimbeni and R. Ottensamer and I. Pagano and E. Pallé and F. A. Pepe and G. Peter and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and S. Lalitha and A. Santerne and N. C. Santos and G. Scandariato and D. Ségransan and A. E. Simon and A. M. S. Smith and M. Steller and Gy. M. Szabó and N. Thomas and S. Udry and V. Van Grootel and N. A. Walton},
journal= {arXiv preprint arXiv:2209.03128},
year = {2022}
}
备注
19 pages, 12 figures, accepted for publication in MNRAS