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arXiv 0910.2887astro-ph.EP
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围绕主序星- I的太阳系外行星的Transit探测。热气球的天空图

Transit detections of extrasolar planets around main-sequence stars - I. Sky maps for hot Jupiters

René Heller, Dimitris Mislis, John Antoniadis

备注：
published in AandA 508, 1509-1516 (2009), 8 pages, 3 figures including 5 transit sky maps, 2 tables; minor orthographic changes, slight title modification, new figure and table arrangement
发表信息：
Astron.Astrophys.508:1509-1516,2009
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摘要：

超过350颗太阳系外行星的发现，其中大多数是非凌日的热彗星，揭示了主序星（MS）宿主恒星的金属丰度与行星入射率之间的相关性。这种联系可以用来计算其他恒星周围的行星形成概率，这些恒星还不知道有行星同伴。我们找到了目前的过境调查的天体平面上的有希望的点，并争取在一般的预期过境次数的绝对值。我们利用第谷星表中大约100万个天体的数据来定位天平面上所有0 m < m_V < 11.5m的恒星。我们采用了第谷星表中列出的参数之间的几个经验关系，例如到地球的距离，m_V和（B-V），以及那些需要解释恒星拥有可观测的凌日系外行星的概率的参数。恒星金属丰度和行星出现之间的经验关系，结合几何因素，用于产生第谷星表中MS星的凌日概率。模拟FOV中的幅度变化，以测试BEST、XO、SuperWASP和HATNet是否会检测到这种波动。我们提出了一个天空地图的预期数量的热木星过境事件的基础上的第谷目录。所考虑的过境调查之间的比较产生了明显不同的预期过境检测的地图。天空积分星等分布预测了20次热木星凌日，轨道周期在1.5 ~ 50 d之间，m_V <8 m，其中两次是目前已知的。总的来说，我们预计在给定的星等范围内，有3412次热木星凌日发生在MS星的前面。地球上最有希望的观测地点位于纬度=-1。

英文摘要：

The findings of more than 350 extrasolar planets, most of them nontransiting Hot Jupiters, have revealed correlations between the metallicity of the main-sequence (MS) host stars and planetary incidence. This connection can be used to calculate the planet formation probability around other stars, not yet known to have planetary companions. We locate the promising spots for current transit surveys on the celestial plane and strive for absolute values of the expected number of transits in general. We used data of the Tycho catalog for about 1 million objects to locate all the stars with 0m < m_V < 11.5m on the celestial plane. We took several empirical relations between the parameters listed in the Tycho catalog, such as distance to Earth, m_V, and (B-V), and those parameters needed to account for the probability of a star to host an observable, transiting exoplanet. The empirical relations between stellar metallicity and planet occurrence combined with geometrical considerations were used to yield transit probabilities for the MS stars in the Tycho catalog. Magnitude variations in the FOV were simulated to test whether this fluctuations would be detected by BEST, XO, SuperWASP and HATNet. We present a sky map of the expected number of Hot Jupiter transit events on the basis of the Tycho catalog. The comparison between the considered transit surveys yields significantly differing maps of the expected transit detections. The sky-integrated magnitude distribution predicts 20 Hot Jupiter transits with orbital periods between 1.5 d and 50 d and m_V < 8m, of which two are currently known. In total, we expect 3412 Hot Jupiter transits to occur in front of MS stars within the given magnitude range. The most promising observing site on Earth is at latitude = -1.

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