Detecting Exomoons via Doppler Monitoring of Directly Imaged Exoplanets
Detecting Exomoons via Doppler Monitoring of Directly Imaged Exoplanets
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DOI：
10.3847/1538-3881/aae0fc
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
A. Vanderburg;S. Rappaport;A. Mayo
中科院分区：
文献类型：
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作者：
A. Vanderburg;S. Rappaport;A. Mayo
蒂奇等人。最近有报道称，在开普勒区域的一颗巨行星周围发现了一颗候选地外卫星，暂时命名为开普勒-1625b I。候选地外卫星的大小和质量与海王星差不多，比我们太阳系中的任何一颗卫星都大得多，如果得到证实，它将成为新类别的巨型卫星或双星中的第一颗。受开普勒-1625b行星和卫星系统中大质量比的启发，我们通过多普勒光谱研究了直接成像的系外行星周围类似质量的系外行星的可探测性。围绕开普勒-1625b运行的候选卫星将在其宿主行星上产生约200的径向速度(RV)信号，该信号足够大，以至于可以用当前或下一代仪器探测到绕着明亮的附近恒星运行的直接成像行星周围的类似卫星。除了搜索外卫星，RV对直接成像的行星的调查可以揭示行星自转轴的方向，从而有可能识别类似天王星的行星。
Teachey et al. recently reported the detection of a candidate exomoon, tentatively designated Kepler-1625b I, around a giant planet in the Kepler field. The candidate exomoon would be about the size and mass of Neptune, considerably larger than any moon in our solar system, and if confirmed, would be the first in a new class of giant moons or binary planets. Motivated by the large mass ratio in the Kepler-1625b planet and satellite system, we investigate the detectability of similarly massive exomoons around directly imaged exoplanets via Doppler spectroscopy. The candidate moon around Kepler-1625b would induce a radial velocity (RV) signal of about 200 on its host planet, large enough that similar moons around directly imaged planets orbiting bright, nearby stars might be detected with current or next generation instrumentation. In addition to searching for exomoons, an RV survey of directly imaged planets could reveal the orientations of the planets’ spin axes, making it possible to identify Uranus analogs.