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Amplitude modulation of short-timescale hot spot variability

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Author(s)

Lauren I. Biddle, Joe Llama, Andrew Cameron, L. Prato, Moira Jardine, Christopher M. Johns-Krull

School/Research organisations

Abstract

Variability of Classical T Tauri stars (CTTS) occurs over a vast range of timescales. CTTS in particular are subject to variability caused by accretion shocks, which can occur stochastically, periodically, or quasi-periodically on timescales over a few days. The detectability of young planets within these systems is likely hampered by activity; therefore, it is essential that we understand the origin of young star variability over a range of timescales to help disentangle stellar activity from signatures of planetary origin. We present an analysis of the stochastic small-amplitude photometric variability in the K2 lightcurve of CI Tau occurring on timescales of ≲1 day. We find the amplitude of this variability exhibits the same periodic signatures as detected in the large-amplitude variability, indicating that the physical mechanism modulating these brightness features is the same. The periods detected are also in agreement with the rotation period of the star (∼6.6 days) and the orbital period of the planet (∼9.0 days) known to drive pulsed accretion onto the star.

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Original languageEnglish
Article number113
Number of pages7
JournalAstrophysical Journal
Volume906
Issue number2
DOIs
Publication statusPublished - 14 Jan 2021

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