Transit timing variation and activity in the WASP-10 planetary system star

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题名:	Transit timing variation and activity in the WASP-10 planetary system star
作者:	Maciejewski,G;Dimitrov,D;Neuhauser,R;Tetzlaff,N;Niedzielski,A;Raetz,S;Chen,WP;Walter,F;Marka,C;Baar,S;Krejcova,T;Budaj,J;Krushevska,V;Tachihara,K;Takahashi,H;Mugrauer,M
贡献者:	天文研究所
关键词:	LIGHT CURVES;OPEN CLUSTERS;SPACED DATA;K STAR;EXOPLANETS;MASS;SEARCH;PHOTOMETRY;EVOLUTION;WASP-B-10
日期:	2011
上传时间:	2012-03-27 18:13:19 (UTC+8)
出版者:	國立中央大學
摘要:	Transit timing analysis may be an effective method of discovering additional bodies in extrasolar systems that harbour transiting exoplanets. The deviations from the Keplerian motion, caused by mutual gravitational interactions between planets, are expected to generate transit timing variations of transiting exoplanets. In 2009, we collected nine light curves of eight transits of the exoplanet WASP-10b. Combining these data with those published, we have found that transit timing cannot be explained by a constant period but by a periodic variation. Simplified three-body models, which reproduce the observed variations of timing residuals, were identified by numerical simulations. We have found that the configuration with an additional planet with a mass of similar to 0.1 M(J) and an orbital period of similar to 5.23 d, located close to the outer 5 : 3 mean motion resonance, is the most likely scenario. If the second planet is a transiter, the estimated flux drop will be similar to 0.3 per cent and can be observed with a ground-based telescope. Moreover, we present evidence that the spots on the stellar surface and the rotation of the star affect the radial-velocity curve, giving rise to a spurious eccentricity of the orbit of the first planet. We argue that the orbit of WASP-10b is essentially circular. Using the gyrochronology method, the host star was found to be 270 +/- 80 Myr old. This young age can explain the large radius reported for WASP-10b.
關聯:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
显示于类别:	[天文研究所] 期刊論文

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