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arXiv 2602.15501astro-ph.EP
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对WASP-31 b的Rossiter-McLaughlin效应的精确测量及其行星传输光谱的表征

Precise measurement of WASP-31 b's Rossiter-McLaughlin effect and characterization of the planet transmission spectra

Observatoire de l’Université de Genève(日内瓦大学天文台);Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto(波尔图大学空间与天体物理研究所);Département de Physique, Institut Trottier de Recherche sur les Exoplanètes, Université de Montréal(蒙特利尔大学特罗蒂埃系外行星研究系);INAF(意大利国家天体物理研究所)
M. Steiner, V. Bourrier, D. Ehrenreich, W. Dethier, H. Chakraborty, S. Pelletier, M. Lendl, B. Akinsanmi, R. Allart, J. M. Almenara, S. Cristiani, J. I. Gonzále… 展开作者

M. Steiner, V. Bourrier, D. Ehrenreich, W. Dethier, H. Chakraborty, S. Pelletier, M. Lendl, B. Akinsanmi, R. Allart, J. M. Almenara, S. Cristiani, J. I. González Hernández, P. D. Marcantonio, C. J. A. P. Martins, L. Mishra, D. Mounzer, M. R. Zapatero Osorio, E. Palle, F. Pepe, A. Psaridi, N. C. Santos, J. V. Seidel, A. Sozzetti, V. Vaulato, G. Viviani, J. Yu

AI总结:

通过精确测量WASP-31 b的Rossiter-McLaughlin效应,研究其传输光谱,发现未检测到大气物种,指出POLD污染仍是高分辨率光谱分析的主要限制。

摘要:

背景。热木星是研究大气成分和动力学的理想自然实验室。然而,高分辨率传输光谱目前受到我们去除行星遮蔽线畸变(POLD)污染能力的限制。目标。在本文中,我们旨在从使用VLT的ESPRESSO光谱仪观测的两个半次光变中表征WASP-31 b的传输光谱。方法。利用RM“革命”方法分析RM特征。在提取行星传输光谱之前,我们使用molecfit校正数据集中的大气线,并进一步使用EvE建模POLD变形。结果。我们确认了之前研究中行星低天空投影自转轨道角的值,并进一步将其值精确定为λ=-0.09±0.31度。我们未在行星大气中检测到任何物种(包括之前已检测到的物种如K或CrH)。在大多数情况下,未检测到的原因是强POLD污染或ESPRESSO波长范围中缺乏可观察的线,因此之前的检测不能被排除。结论。行星遮蔽线畸变污染仍然是高分辨率传输光谱的主要限制因素,阻碍了存在星体和行星中物种的检测,即使使用了最先进的模型,特别是对于具有低天空投影自转轨道角的行星。开发先进的技术来隔离行星信号在ELT类观测到来之际尤为重要。

英文摘要:

Context. Hot Jupiters are ideal natural laboratories to investigate atmospheric composition and dynamics. However, high-resolution transmission spectroscopy is currently limited by our capability of removing planet-occulted line-distortion (POLD) contamination from the signal. Aims. In this paper, we aim to characterize the transmission spectrum of WASP-31 b from two and a half transits observed with the ESPRESSO spectrograph at the VLT. Methods. The Rossiter-McLaughlin (RM) signature was analyzed using the RM "revolutions" method. Before extracting the transmission spectrum of the planet, we corrected the dataset for telluric lines using molecfit and further modeled the POLD deformations using EvE. Results. We confirm the planet low sky-projected spin-orbit angle from previous studies and further refine its value to $λ= -0.09^{+0.31}_{-0.32}$ deg. We do not detect any species (including previously detected species such as K or CrH) in the planetary atmosphere. In most cases the non-detections are due to the strong POLDs contamination or lack of observable lines in the ESPRESSO wavelength range, and so previous detections cannot be ruled out. Conclusions. Planet-occulted line-distortion contamination continues to be the main limitation of high-resolution transmission spectroscopy for species present in both the star and the planet, hindering atmospheric detections even with state-of-the-art models, in particular for planets with a low sky-projected spin-orbit angle. Developing advanced techniques to isolate planetary signatures is of utmost importance in the advent of ELT-like observations.

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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