TOI-540 b

TOI-540 b
仮符号・別名 TOI 540 b
星座 がか座[1]
分類 太陽系外惑星
軌道の種類 周回軌道
発見
発見年 2020年[2]
発見者 TESS[1]
発見方法 トランジット法[2]
軌道要素と性質
軌道の種類 周回軌道
軌道長半径 (a) 0.01223±0.00036 au[2]
離心率 (e) 0[2]
公転周期 (P) 1.2391491±1.7e-06 [2]
軌道傾斜角 (i) 86.8±0.28 °[2]
通過時刻 2458411.82601±0.00046 BJD[2]
TOI-540の惑星
衛星の数 0
位置
赤経 (RA, α)  05h 05m 14s[2]
赤緯 (Dec, δ) −47° 56′ 16″[2]
物理的性質
半径 0.08056±0.00464 RJ[2]
平均密度 5.2 g/cm³[1]
表面温度 611±23 K[2]
他のカタログでの名称
Template (ノート 解説) ■Project

TOI-540 bとは、地球からがか座の方向に約45.7光年離れた場所に位置する恒星 TOI-540 の周囲を公転している太陽系外惑星である[1]

概要 

大きさの比較
地球 TOI-540 b
地球 Exoplanet

TOI-540 bは、TESSによるトランジット法を用いた観測で発見された[2][1]。大きさは地球の約0.9倍と、地球よりも小さな惑星である[3][1]。主星から受けるエネルギーは地球が太陽から受けるエネルギーの23.4倍(水星の3.5倍)とされており、表面温度は338℃にもなる[1]チリセロ・トロロ汎米天文台による後の観測で惑星の存在が確認された。

主星 

主星であるTOI-540は、2MASS J05051443-4756154UCAC4 211-005570とも呼称されており、質量太陽の16%、大きさは太陽の0.19倍の赤色矮星である[1]惑星を持つ恒星であるTRAPPIST-1も自転速度が速いが、TOI-540はより速いことが判明している(自転周期は17.4時間)。

脚注

  1. ^ a b c d e f g h Hot Exoplanet Smaller than Earth Found Orbiting Nearby Red Dwarf”. SCI NEWS (2020年10月6日). 2020年10月8日閲覧。
  2. ^ a b c d e f g h i j k l Planet TOI-540 b”. 太陽系外惑星エンサイクロペディア (2020年9月30日). 2020年10月8日閲覧。
  3. ^ TOI 540 b: A Planet Smaller than Earth Orbiting a Nearby Rapidly Rotating Low-mass Star”. arXiv (2020年9月28日). 2020年10月8日閲覧。

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