Amplitude Modulation of Short-timescale Hot Spot Variability

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...

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Bibliographic Details
Published in:The Astrophysical journal 2021-01, Vol.906 (2), p.113
Main Authors: Biddle, Lauren I., Llama, Joe, Cameron, Andrew, Prato, L., Jardine, Moira, Johns-Krull, Christopher M.
Format: Article
Language:English
Subjects:
Accretion
Amplitude modulation
Astrophysics
Classical T Tauri stars
Deposition
Exoplanet formation
Exoplanets
Hot Jupiters
Light curves
Orbits
Planets
Signatures
Stars
Stellar accretion disks
Stellar activity
Stellar rotation
T Tauri stars
Variability
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Summary: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.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/abc889