ANALYSIS OF SPIN–ORBIT ALIGNMENT IN THE WASP-32, WASP-38, AND HAT-P-27/WASP-40 SYSTEMS
ANALYSIS OF SPIN–ORBIT ALIGNMENT IN THE WASP-32, WASP-38, AND HAT-P-27/WASP-40 SYSTEMS
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DOI：
10.1088/0004-637x/760/2/139
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发表时间：
2012-12
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通讯作者：
D. Brown;A. C. Cameron;R. F. Díaz;A. Doyle;M. Gillon;M. Lendl;B. Smalley;A. Triaud;D. Anderson;B. Enoch;C. Hellier;P. Maxted;G. Miller;D. Pollacco;D. Queloz;I. Boisse;G. Hébrard
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作者：
D. Brown;A. C. Cameron;R. F. Díaz;A. Doyle;M. Gillon;M. Lendl;B. Smalley;A. Triaud;D. Anderson;B. Enoch;C. Hellier;P. Maxted;G. Miller;D. Pollacco;D. Queloz;I. Boisse;G. Hébrard
我们目前的测量自旋轨道对准角，λ，热木星系统WASP-32，WASP-38和HAT-P-27/WASP-40，使用HARPS摄谱仪获得的数据的基础上。我们分析了所有三个系统的Rossiter-McLaughlin效应，并对WASP-32和WASP-38进行了多普勒层析成像。我们发现WASP-32（Teff = 6140+90− 100 K）是对齐的，通过层析成像获得的对齐角为λ = 10.°5 + 6.4 − 6.5，WASP-38（Teff = 6180+40− 60 K）也是对齐的，层析成像分析得出λ = 7.°5 + 4.7 − 6.1。与Simpson等人之前的分析相比，后一个结果提供了λ的不确定性的数量级改进。由于我们数据的信噪比很差，我们只能将HAT-P-27/WASP-40（Teff = 5190+160− 170 K）的角度松散地限制为λ = 24.°2 + 76.0 − 44.5。我们认为这一结果是一个非检测下的一个稍微更新的版本的对齐测试布朗等人。我们把我们的结果的背景下的自旋轨道对齐测量的完整样本，发现他们提供了进一步的支持，以前建立的趋势。
We present measurements of the spin–orbit alignment angle, λ, for the hot Jupiter systems WASP-32, WASP-38, and HAT-P-27/WASP-40, based on data obtained using the HARPS spectrograph. We analyze the Rossiter–McLaughlin effect for all three systems and also carry out Doppler tomography for WASP-32 and WASP-38. We find that WASP-32 (Teff = 6140+90− 100 K) is aligned, with an alignment angle of λ = 10.°5 + 6.4 − 6.5 obtained through tomography, and that WASP-38 (Teff = 6180+40− 60 K) is also aligned, with tomographic analysis yielding λ = 7.°5 + 4.7 − 6.1. The latter result provides an order-of-magnitude improvement in the uncertainty in λ compared to the previous analysis of Simpson et al. We are only able to loosely constrain the angle for HAT-P-27/WASP-40 (Teff = 5190+160− 170 K) to λ = 24.°2 + 76.0 − 44.5, owing to the poor signal-to-noise ratio of our data. We consider this result a non-detection under a slightly updated version of the alignment test of Brown et al. We place our results in the context of the full sample of spin–orbit alignment measurements, finding that they provide further support for previously established trends.