SIMBAD references

2026ApJ...998..204C - Astrophys. J., 998, 204 (2026/February-3)

Unveiling the Dual Nature of V1180 Cas: UXor-like Dips and EXor-like Bursts across a Decade.

CHAND T., SHARMA S., SINGH K., NINAN J.P., GHOSH A., OJHA D.K., BAUG T., SAHU D.K., BHATT B.C., KUMAR P., YADAV R.K., PANWAR N., VERMA A., KAUR H., MAMTA, CHAKRABORTY M., GOKHE K. and SINGH A.K.

Abstract (from CDS):

We present a detailed analysis of the long-term photometric and spectroscopic evolution of V1180 Cas over a decade, aiming to identify the dominant mechanisms behind its variability. We combine multiband light curves from 1999 to 2025 with over 30 epochs of optical to near-infrared (NIR) spectroscopy (0.5-2.5 μm), analyzing variability patterns, color behavior, and emission line diagnostics. We investigate the temporal evolution of accretion and outflow indicators and their correlation with photometric states. The light curve reveals a transition from sporadic early dimming events to a quasi-periodic pattern since 2018, with 11 major dips showing asymmetry and stochastic substructure. Color-magnitude diagrams show classic UXor-like blueing during deep minima, while NIR and mid-infrared color changes indicate thermal evolution of the disk. Spectroscopic analysis reveals persistent hydrogen, Ca II, He I, and forbidden line emission. Accretion diagnostics track photometric variability, and forbidden lines often intensify during dips, implying a physical link between extinction and outflows. Estimated accretion rates range from ∼10–8 to 10–7M⊙ yr–1; the outflow rate and density diagnostics are consistent with disk winds and shock-excited jets. V1180 Cas demonstrates dual-mode variability driven by both variable circumstellar extinction and episodic accretion events. The hybrid UXor/EXor behavior, combined with evolving disk signatures and persistent outflows, suggests a young stellar object undergoing coupled accretion-extinction-outflow evolution. Continued monitoring will be essential to fully resolve the physical processes shaping its variability.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Star formation - Pre-main sequence stars - Stellar winds - Spectroscopy - Classical T Tauri stars - Photometry

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 16

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2026ApJ...998..204C and select 'bookmark this link' or equivalent in the popup menu