CIRCUMBINARY PLANETS ORBITING THE RAPIDLY PULSATING SUBDWARF B-TYPE BINARY NY Vir
CIRCUMBINARY PLANETS ORBITING THE RAPIDLY PULSATING SUBDWARF B-TYPE BINARY NY Vir
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DOI：
10.1088/2041-8205/745/2/l23
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
S. Qian;L.-Y. Zhu;Z.-B. Dai;E. Fernández-Lajús;F. Xiang;J.-J. He-J.
中科院分区：
文献类型：
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作者：
S. Qian;L.-Y. Zhu;Z.-B. Dai;E. Fernández-Lajús;F. Xiang;J.-J. He-J.
We report here the tentative discovery of a Jovian planet in orbit around the rapidly pulsating subdwarf B-type (sdB-type) eclipsing binary NY Vir. By using newly determined eclipse times together with those collected from the literature, we detect that the observed–calculated (O − C) curve of NY Vir shows a small-amplitude cyclic variation with a period of 7.9 yr and a semiamplitude of 6.1 s, while it undergoes a downward parabolic change (revealing a period decrease at a rate of ). The periodic variation was analyzed for the light-travel-time effect via the presence of a third body. The mass of the tertiary companion was determined to be M3sin i′ = 2.3(± 0.3)MJupiter when a total mass of 0.60 M☉ for NY Vir is adopted. This suggests that it is most probably a giant circumbinary planet orbiting NY Vir at a distance of about 3.3 astronomical units (AU). Since the rate of period decrease cannot be explained by true angular momentum loss caused by gravitational radiation or/and magnetic braking, the observed downward parabolic change in the O − C diagram may be only a part of a long-period (longer than 15 years) cyclic variation, which may reveal the presence of another Jovian planet (∼2.5 MJupiter) in the system.
