CHEOPS 观测到的 WASP-189b 炽热昼面与非对称凌星
地球与行星天体物理
2020-11-11 v1 天体物理仪器与方法
太阳与恒星天体物理
摘要
专门用于系外行星后续观测的 CHEOPS 空间任务于 2019 年 12 月发射，具备在 20 ppm 水平上进行测光测量的能力。由于 CHEOPS 在宽光学波段中进行观测，它可通过观测掩星和相位曲线，提供系外行星反射光的见解，并约束最热行星的短波长热发射。在此，我们报告 CHEOPS 对一次掩星的首次观测，即热木星 WASP-189b 的掩星，该行星为质量 、绕 A 型星运行的行星。我们在单次测量中以高显著性探测到 WASP-189 b 的掩星，并基于四次掩星推导出掩星深度 ppm。我们将这些测量与模型预测比较，发现当假设热量再分布低效时，其与加热至 K 温度的无反射大气一致。此外，我们呈现了 CHEOPS 观测到的两次 WASP-189b 凌星。这些凌星具有非对称形状，我们将其归因于宿主恒星因其高速率自转引起的引力变暗。我们利用这些测量精化了行星参数，发现相较于发现论文凌星深度深约 25%，并将 WASP-189b 的半径更新为 。我们进一步测得投影轨道倾角 deg，该值与先前光谱观测结果吻合良好，并推导出真实倾角 deg。最后，我们提供 CHEOPS 卫星所达测光精度的参考值：对于 V=6.6 mag 恒星，采用一小时分箱，我们在单个光变曲线上获得 10 至 17ppm 的残差 RMS，合并四次观测时为 5.7ppm。
引用
@article{arxiv.2009.13403,
title = {The hot dayside and asymmetric transit of WASP-189b seen by CHEOPS},
author = {M. Lendl and Sz. Csizmadia and A. Deline and L. Fossati and D. Kitzmann and K. Heng and S. Hoyer and S. Salmon and W. Benz and C. Broeg and D. Ehrenreich and A. Fortier and D. Queloz and A. Bonfanti and A. Brandeker and A. Collier Cameron and L. Delrez and A. Garcia Muñoz and M. J. Hooton and P. F. L. Maxted and B. M. Morris and V. Van Grootel and T. G. Wilson and Y. Alibert and R. Alonso and J. Asquier and T. Bandy T. Bárczy and D. Barrado and S. C. C Barros and W. Baumjohann and M. Beck and T. Beck and A. Bekkelien and M. Bergomi and N. Billot and F. Biondi and X. Bonfils and V. Bourrier and M-D. Busch and J. Cabrera and V. Cessa and S. Charnoz and B. Chazelas and C. Corral Van Damme and M. B. Davies and M. Deleuil and O. D. S Demangeon and B. -O. Demory and A. Erikson and J. Farinato and M. Fridlund and D. Futyan and D. Gandolfi and M. Gillon and P. Guterman and J. Hasiba and E. Hernandez and K. G. Isaak and L. Kiss and T. Kuntzer and A. Lecavelier des Etangs and T. Lüftinger and J. Laskar and C. Lovis and D. Magrin and L. Malvasio and L. Marafatto and H. Michaelis and M. Munari and V. Nascimbeni and G. Olofsson and H. Ottacher and R. Ottensamer and I. Pagano and E. Pallé and G. Peter and D. Piazza and G. Piotto and D. Pollacco and F. Ratti and H. Rauer and R. Ragazzoni and N. Rando and I. Ribas and M. Rieder and R. Rohlfs and F. Safa and N. C. Santos and G. Scandariato and D. Ségransan and A. E. Simon and V. Singh and A. M. S. Smith and M. Sordet and S. G. Sousa and M. Steller and Gy. M. Szabó and N. Thomas and M. Tschentscher and S. Udry and V. Viotto and I. Walter and N. A. Walton and F. Wildi and D. Wolter},
journal= {arXiv preprint arXiv:2009.13403},
year = {2020}
}
备注
In press at Astronomy and Astrophysics