Dipper stars are extrinsically variable stars with deep dimming events due to extended, often dusty, structures produced by a wide range of mechanisms such as collisions, protoplanetary evolution or stellar winds. ASAS-SN has discovered 12 dipper-like objects as part of its normal operations. Here we systematically search the ∼5.1 million ASAS-SN targets with 13<g<14~mag for dippers with Δg≥0.3~mag to identify 4 new candidates. We also discover 15 long-period eclipsing binary candidates. We characterized the 19 new and 12 previously discovered objects using the ASAS-SN light curves and archival multi-wavelength data. We divide them into three categories: long-period eclipsing binaries with a single eclipse (13 total), long-period eclipsing binaries with multiple eclipses (7 total) and dipper stars with dust or disk occultations (11 total).
@article{arxiv.2507.19594,
title = {A Systematic Search for Big Dippers in ASAS-SN},
author = {B. JoHantgen and D. M. Rowan and R. Forés-Toribio and C. S. Kochanek and K. Z. Stanek and B. J. Shappee and Subo Dong and J. L. Prieto and Todd A. Thompson},
journal= {arXiv preprint arXiv:2507.19594},
year = {2026}
}
Comments
Published in the Open Journal of Astrophysics. Supplemental plots included in the TeX Source files