Activity of TIC 88785435 and Atmospheric Mass Loss of its Planet

IF 0.7 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS

Astrophysics Pub Date : 2025-08-18 DOI:10.1007/s10511-025-09867-0

I. S. Savanov

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引用次数: 0

Abstract

We studied the activity of the young K7V star TIC 88785435 and estimated a possible atmospheric mass loss from its exoplanet. TIC 88785435 is a member of the ϕ Lup subgroup, with an age of 9.9–17.7 Myr; the age of the star itself is 16.0 ± 1.6 Myr. according to our estimates based on TESS data, the star spots cover 6.3% and 10.5% of its visible surface area, which corresponds to absolute values of 43,000 and 71,300 millionths of the solar hemisphere (MSH) for Sectors 38 and 65, respectively. The most reliable flare detected from this star had a total emitted energy of 1.03·10³³ erg. The planet TIC 88785435 b is classified as a super-Neptune. It orbits the star with a period of 10.51 days, has a radius of R_b = 5.03R_⨁, and an estimated mass of M_b = 20.0M_⨁, based on empirical mass–radius relation (M–R). Atmospheric escape calculations using the energy-limited escape model revealed that the planetary mass-loss rate from TIC 88785435/b may lie in the range of 2.7·10⁸ g/s to 1.7·10⁹ g/s, depending on the level of stellar activity.

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TIC 88785435的活动与行星大气质量损失

我们研究了年轻的K7V恒星TIC 88785435的活动，并估计了它的系外行星可能造成的大气质量损失。TIC 88785435是φ - Lup子群的成员，年龄为9.9-17.7 Myr；恒星本身的年龄是16.0±1.6 Myr。根据我们基于TESS数据的估计，恒星黑子覆盖了其可见表面积的6.3%和10.5%，分别对应于38区和65区太阳半球（MSH）的43,000和71,300分之一的绝对值。从这颗恒星探测到的最可靠的耀斑总发射能量为1.03·1033尔格。行星TIC 88785435 b被归类为超级海王星。它绕恒星运行的周期为10.51天，半径Rb = 5.03R ω，根据经验质量-半径关系（M-R）估计质量Mb = 20.0M ω。利用能量限制逸出模型进行的大气逸出计算表明，TIC 88785435/b的行星质量损失率可能在2.7·108 g/s至1.7·109 g/s之间，具体取决于恒星活动水平。

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来源期刊

Astrophysics 地学天文-天文与天体物理

CiteScore

0.90

自引率

20.00%

发文量

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.