arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.3678astro-ph.EP
收藏

反对年轻热木星在BD +20 1790附近的证据

Evidence against the young hot-Jupiter around BD +20 1790

P. Figueira, M. Marmier, X. Bonfils, E. di Folco, S. Udry, N. C. Santos, C. Lovis, D. Megevand, C. H. F. Melo, F. Pepe, D. Queloz, D. Segransan, A. H. M. J. Tri… 展开作者

P. Figueira, M. Marmier, X. Bonfils, E. di Folco, S. Udry, N. C. Santos, C. Lovis, D. Megevand, C. H. F. Melo, F. Pepe, D. Queloz, D. Segransan, A. H. M. J. Triaud, P. Viana Almeida

摘要:

上下文年轻的活跃恒星BD +20 1790被认为拥有一颗亚恒星伴星,这是通过径向速度测量发现的,该测量检测到了母星上引起的反射运动。目标。为了评估径向速度信号的性质,需要对径向速度信号进行完整的表征。方法.我们使用CORALIE摄谱仪获得精确的(~10 m/s)速度测量这颗活跃的恒星,同时表征平分线跨度的变化。特别注意的是,正确采样的行星轨道周期为7.8天,恒星自转周期为2.4天。结果探测到的径向速度信号(峰-峰变化<500米/秒)比以前报告的要小,在两次不同的活动中幅度不同。一个类似的旋转周期的周期性的数据,以及径向速度和平分线跨度之间的明确的相关性。这一证据指向恒星径向速度变化的恒星起源,而不是恒星的重心运动,并否定了热木星的检测报告。

英文摘要:

Context. The young active star BD +20 1790 is believed to host a substellar companion, revealed by radial-velocity measurements that detected the reflex motion induced on the parent star. Aims. A complete characterisation of the radial-velocity signal is necessary in order to assess its nature. Methods. We used CORALIE spectrograph to obtain precise (~10 m/s) velocity measurements on this active star, while characterizing the bisector span variations. Particular attention was given to correctly sample both the proposed planetary orbital period, of 7.8 days, and the stellar rotation period, of 2.4 days. Results. A smaller radial-velocity signal (with peak-to-peak variations <500 m/s) than had been reported previously was detected, with different amplitude on two different campaigns. A periodicity similar to the rotational period is found on the data, as well as a clear correlation between radial-velocities and bisector span. This evidence points towards a stellar origin of the radial-velocity variations of the star instead of a barycentric movement of the star, and repudiates the reported detection of a hot-Jupiter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑