Monitoring Hα Emission from the Wide-orbit Brown-dwarf Companion FU Tau B

Ya Lin Wu*, Yu Chi Cheng, Li Ching Huang, Brendan P. Bowler, Laird M. Close, Wei Ling Tseng, Ning Chen, Da Wei Chen


研究成果: 雜誌貢獻期刊論文同行評審


Monitoring mass accretion onto substellar objects provides insights into the geometry of the accretion flows. We use the Lulin One-meter Telescope to monitor Hα emission from FU Tau B, a ∼19 M Jup brown-dwarf companion at 5.″7 (719 au) from the host star, for six consecutive nights. This is the longest continuous Hα monitoring for a substellar companion near the deuterium-burning limit. We aim to investigate if accretion near the planetary regime could be rotationally modulated as suggested by magnetospheric accretion models. We find tentative evidence that Hα mildly varies on hourly and daily timescales, though our sensitivity is not sufficient to definitively establish any rotational modulation. No burst-like events are detected, implying that accretion onto FU Tau B is overall stable during the time baseline and sampling windows over which it was observed. The primary star FU Tau A also exhibits Hα variations over timescales from minutes to days. This program highlights the potential of monitoring accretion onto substellar objects with small telescopes.

期刊Astronomical Journal
出版狀態已發佈 - 2023 10月 1

ASJC Scopus subject areas

  • 天文和天體物理學
  • 空間與行星科學


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