arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.13403astro-ph.EPastro-ph.IMastro-ph.SR
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由CHEOPS观测到的WASP-189 b的热昼面和不对称transit

The hot dayside and asymmetric transit of WASP-189b seen by CHEOPS

M. Lendl, Sz. Csizmadia, A. Deline, L. Fossati, D. Kitzmann, K. Heng, S. Hoyer, S. Salmon, W. Benz, C. Broeg, D. Ehrenreich, A. Fortier, D. Queloz, A. Bonfanti,… 展开作者

M. Lendl, Sz. Csizmadia, A. Deline, L. Fossati, D. Kitzmann, K. Heng, S. Hoyer, S. Salmon, W. Benz, C. Broeg, D. Ehrenreich, A. Fortier, D. Queloz, A. Bonfanti, A. Brandeker, A. Collier Cameron, L. Delrez, A. Garcia Muñoz, M. J. Hooton, P. F. L. Maxted, B. M. Morris, V. Van Grootel, T. G. Wilson, Y. Alibert, R. Alonso, J. Asquier, T. Bandy T. Bárczy, D. Barrado, S. C. C Barros, W. Baumjohann, M. Beck, T. Beck, A. Bekkelien, M. Bergomi, N. Billot, F. Biondi, X. Bonfils, V. Bourrier, M-D. Busch, J. Cabrera, V. Cessa, S. Charnoz, B. Chazelas, C. Corral Van Damme, M. B. Davies, M. Deleuil, O. D. S Demangeon, B. -O. Demory, A. Erikson, J. Farinato, M. Fridlund, D. Futyan, D. Gandolfi, M. Gillon, P. Guterman, J. Hasiba, E. Hernandez, K. G. Isaak, L. Kiss, T. Kuntzer, A. Lecavelier des Etangs, T. Lüftinger, J. Laskar, C. Lovis, D. Magrin, L. Malvasio, L. Marafatto, H. Michaelis, M. Munari, V. Nascimbeni, G. Olofsson, H. Ottacher, R. Ottensamer, I. Pagano, E. Pallé, G. Peter, D. Piazza, G. Piotto, D. Pollacco, F. Ratti, H. Rauer, R. Ragazzoni, N. Rando, I. Ribas, M. Rieder, R. Rohlfs, F. Safa, N. C. Santos, G. Scandariato, D. Ségransan, A. E. Simon, V. Singh, A. M. S. Smith, M. Sordet, S. G. Sousa, M. Steller, Gy. M. Szabó, N. Thomas, M. Tschentscher, S. Udry, V. Viotto, I. Walter, N. A. Walton, F. Wildi, D. Wolter

摘要:

CHEOPS太空任务于2019年12月发射,专门用于系外行星后续行动,配备了在20 ppm水平进行光度测量的能力。由于CHEOPS在广泛的光学通带中进行观测,它可以提供对系外行星反射光的深入了解,并通过观测掩星和相位曲线来限制最热行星的短波长热发射。在这里,我们报告的第一个CHEOPS观测掩星,即热木星WASP-189 b,一个$M_P \approx 2 M_J$行星绕A型恒星。我们在单独的测量中检测到WASP-189 b的掩星,并根据四次掩星得出了$dF = 87.9 \pm 4.3$ ppm的掩星深度。我们将这些测量结果与模型预测进行了比较,发现它们与加热到$3435 \pm 27$ K温度的无反射大气一致,假设热再分布效率低下。此外,我们还报道了CHEOPS观测到的WASP-189 b的两次凌日。这些凌日有一个不对称的形状,我们归因于引力暗化的主机恒星所造成的高旋转速率。我们使用这些测量来改进行星参数,发现与发现论文相比更深的$\sim25\%$过境,并将WASP-189 b的半径更新为$1.619\pm0.021 R_J$。我们进一步测量了投影的轨道平行度为$λ= 86.4^{+2.9}_{-4.4}$ deg,该值与以前的光谱观测测量值非常一致,并得出了真正的平行度为$Ψ= 85.4\pm4.3$ deg。最后,我们提供了参考值的测光精度所达到的CHEOPS卫星:对于V=6.6等的恒星,并使用一个小时的binning,我们得到一个剩余的RMS之间的10和17 ppm的个人光变曲线,和5.7 ppm时,结合四次访问。

英文摘要:

The CHEOPS space mission dedicated to exoplanet follow-up was launched in December 2019, equipped with the capacity to perform photometric measurements at the 20 ppm level. As CHEOPS carries out its observations in a broad optical passband, it can provide insights into the reflected light from exoplanets and constrain the short-wavelength thermal emission for the hottest of planets by observing occultations and phase curves. Here, we report the first CHEOPS observation of an occultation, namely, that of the hot Jupiter WASP-189b, a $M_P \approx 2 M_J$ planet orbiting an A-type star. We detected the occultation of WASP-189 b at high significance in individual measurements and derived an occultation depth of $dF = 87.9 \pm 4.3$ppm based on four occultations. We compared these measurements to model predictions and we find that they are consistent with an unreflective atmosphere heated to a temperature of $3435 \pm 27$K, when assuming inefficient heat redistribution. Furthermore, we present two transits of WASP-189b observed by CHEOPS. These transits have an asymmetric shape that we attribute to gravity darkening of the host star caused by its high rotation rate. We used these measurements to refine the planetary parameters, finding a $\sim25\%$ deeper transit compared to the discovery paper and updating the radius of WASP-189b to $1.619\pm0.021 R_J$. We further measured the projected orbital obliquity to be $λ= 86.4^{+2.9}_{-4.4}$deg, a value that is in good agreement with a previous measurement from spectroscopic observations, and derived a true obliquity of $Ψ= 85.4\pm4.3$deg. Finally, we provide reference values for the photometric precision attained by the CHEOPS satellite: for the V=6.6 mag star, and using a one-hour binning, we obtain a residual RMS between 10 and 17ppm on the individual light curves, and 5.7ppm when combining the four visits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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