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arXiv 2106.15902astro-ph.SRastro-ph.EP
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在J1407(V1400 Cen)系统中寻找凌日伴星

A search for transiting companions in the J1407 (V1400 Cen) system

S. Barmentloo, C. Dik, M. A. Kenworthy, E. E. Mamajek, F. -J. Hambsch, D. E. Reichart, J. E. Rodriguez, D. M. van Dam

摘要:

2007年,年轻的恒星1 SWASP J140747.93-394542.6(V1400 Cen)经历了一系列复杂的深蚀,历时56天。这是由于一个环系统的凌日填充了一个看不见的亚恒星伴星的希尔球的很大一部分。随后的光度监测没有发现任何其他来自这个候选环系统的深凌,但如果有更多的亚恒星伴星,并且它们与潜在的环系统共面,它们也有可能会经过恒星。这颗年轻的恒星是活跃的,光变曲线显示出5%的振幅调制,由于恒星黑子的旋转,其主要旋转周期为3.2天。我们的模型,并删除旋转调制的J1407光变曲线和搜索额外的过境签名围绕J1407轨道的亚恒星同伴。我们结合测光J1407从几个天文台,跨越19年的基线。我们通过将可变性建模为周期性信号来去除旋转调制,由于恒星的活动周期,其周期性随着时间的推移在几年内缓慢变化。凌日最小二乘(TLS)分析在清洁光变曲线内搜索任何周期性凌日信号。我们确定了J1407的活动周期为5.4年。凌日最小二乘搜索在光变曲线中没有发现任何合理的周期性日食,从5天的1.2%振幅到20天的1.9%振幅。这种灵敏度是通过将人工凌日注入光变曲线并确定作为凌日深度和轨道周期函数的恢复分数来证实的。J1407被确认为一颗年轻的活跃恒星,其活动周期与快速旋转的太阳质量恒星一致。由于旋转调制被移除,TLS分析排除了半径大于1木星的凌日伴星。

英文摘要:

In 2007, the young star 1SWASP J140747.93-394542.6 (V1400 Cen) underwent a complex series of deep eclipses over 56 days. This was attributed to the transit of a ring system filling a large fraction of the Hill sphere of an unseen substellar companion. Subsequent photometric monitoring has not found any other deep transits from this candidate ring system, but if there are more substellar companions and they are coplanar with the potential ring system, there is a chance that they will transit the star as well. This young star is active and the light curves show a 5% modulation in amplitude with a dominant rotation period of 3.2 days due to star spots rotating in and out of view. We model and remove the rotational modulation of the J1407 light curve and search for additional transit signatures of substellar companions orbiting around J1407. We combine the photometry of J1407 from several observatories, spanning a 19 year baseline. We remove the rotational modulation by modeling the variability as a periodic signal, whose periodicity changes slowly with time over several years due to the activity cycle of the star. A Transit Least Squares (TLS) analysis searches for any periodic transiting signals within the cleaned light curve. We identify an activity cycle of J1407 with a period of 5.4 years. A Transit Least Squares search does not find any plausible periodic eclipses in the light curve, from 1.2% amplitude at 5 days up to 1.9% at 20 days. This sensitivity is confirmed by injecting artificial transits into the light curve and determining the recovery fraction as a function of transit depth and orbital period. J1407 is confirmed as a young active star with an activity cycle consistent with a rapidly rotating solar mass star. With the rotational modulation removed, the TLS analysis rules out transiting companions with radii larger than about 1 Jupiter.

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