Photometric monitoring of the young star Par 1724 in Orion

TL;DR

This study presents new photometric data of the young star Par 1724, confirming its 5.7-day rotation period and revealing a possible long-term activity cycle of approximately 9 or 17.5 years, similar to solar cycles.

Contribution

First detection of a long-term activity cycle in a very young star, expanding understanding of stellar magnetic activity evolution.

Findings

Confirmed 5.7-day rotation period in Par 1724.

Detected potential long-term cycle of 9 or 17.5 years.

Provided multi-telescope photometric observations.

Abstract

We report new photometric observations of the 200000 year old naked weak-line run-away T Tauri star Par 1724, located north of the Trapezium cluster in Orion. We observed in the broad band filters B, V, R, and I using the 90cm Dutch telescope on La Silla, the 80cm Wendelstein telescope, and a 25cm telescope of the University Observatory Jena in Grossschwabhausen near Jena. The photometric data in V and R are consistent with a 5.7 day rotation period due to spots, as observed before between 1960ies and 2000. Also, for the first time, we present evidence for a long-term 9 or 17.5 year cycle in photometric data (V band) of such a young star, a cycle similar to that to of the Sun and other active stars.