Activity of the Star Gl 414A with Two Planets and its Effect on the Loss of Mass of the Atmosphere of the Planet Gl 414A b

IF 0.6 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS
I. S. Savanov
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引用次数: 0

Abstract

Results are presented from a study of manifestations of the activity of the dwarf Gl 414A of spectral class K7 with two planets, one of which (the planet Gl 414A b) with an eccentricity e=0.45 was found to be within the habitable zone over a large part of its orbit. Our analysis showed that the most reliable determination of the rotation period of Gl 414A was obtained from an analysis of photometric observations of the star in the KELT (Kilodegree Extremely Little Telescope) survey which yield a rotation period of P=42 days. However, the existence of this period is not confirmed by periodograms constructed from other observations of Gl 414A. The long-term activity cycle of the star is on the order of 3800 days (10.4 years). The obtained data on the activity of the star were used to estimate the loss of matter from the atmosphere of the planet Gl 414A b using an approximation formula for a model of atmospheric loss with a limit on energy. Based on 486 estimates of the parameter SHK, the loss of matter by the atmosphere of Gl 414A b over an interval of 5805 days (15.9 years) was calculated. The magnitude of these losses mainly lies within a range of log(Mloss) from 7.15 to 7.50 with a median of 7.30. For an eccentricity of 0.45 the distance from the central star to Gl 414A b ranges from 0.13 to 0.34 a.u., and for these distances the estimated losses of matter by the atmosphere are 16.21·1017 and 2.37·1017 g/s, respectively.

两行星恒星Gl 414A的活动及其对行星Gl 414A b大气质量损失的影响
对光谱类K7的矮行星Gl 414A的两颗行星的活动表现进行了研究,发现其中一颗(行星Gl 414A b)的离心率为e=0.45,在其大部分轨道上处于宜居带内。我们的分析表明,对Gl 414A旋转周期的最可靠的确定是通过对KELT(千度极小望远镜)巡天中恒星的光度观测进行分析得出的,该巡天得出的旋转周期为P=42天。然而,这一周期的存在并没有得到其他Gl 414A观测数据所构建的周期图的证实。这颗恒星的长期活动周期约为3800天(10.4年)。所获得的恒星活动数据被用于估计行星Gl 414A b大气中物质的损失,使用一个具有能量限制的大气损失模型的近似公式。基于对参数SHK的486次估计,计算了Gl 414A b在5805天(15.9年)的时间间隔内大气的物质损失。这些损失的大小主要在7.15到7.50的log(Mloss)范围内,中位数为7.30。在离心率为0.45的情况下,从中心恒星到Gl 414A b的距离在0.13到0.34 a.u.之间,对于这些距离,大气对物质的估计损失分别为16.21·1017和2.37·1017 g/s。
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来源期刊
Astrophysics
Astrophysics 地学天文-天文与天体物理
CiteScore
0.90
自引率
20.00%
发文量
32
审稿时长
6-12 weeks
期刊介绍: Astrophysics (Ap) is a peer-reviewed scientific journal which publishes research in theoretical and observational astrophysics. Founded by V.A.Ambartsumian in 1965 Astrophysics is one of the international astronomy journals. The journal covers space astrophysics, stellar and galactic evolution, solar physics, stellar and planetary atmospheres, interstellar matter. Additional subjects include chemical composition and internal structure of stars, quasars and pulsars, developments in modern cosmology and radiative transfer.
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