Unveiling the Dual Nature of V1180 Cas: UXor-like Dips and EXor-like Bursts Across a Decade
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Chand, Tarak Sharma, Saurabh Singh, Koshvendra Ninan, Joe P. Ghosh, Arpan Ojha, Devendra K. Baug, Tapas Sahu, D. K. Bhatt, Bhuwan C. Kumar, Pramod Yadav, Ram K. Panwar, Neelam Verma, Aayushi Kaur, Harmeen Mamta Chakraborty, Manojit Gokhe, Kartik Singh, Ajay Kumar |
| author_facet | Chand, Tarak Sharma, Saurabh Singh, Koshvendra Ninan, Joe P. Ghosh, Arpan Ojha, Devendra K. Baug, Tapas Sahu, D. K. Bhatt, Bhuwan C. Kumar, Pramod Yadav, Ram K. Panwar, Neelam Verma, Aayushi Kaur, Harmeen Mamta Chakraborty, Manojit Gokhe, Kartik Singh, Ajay Kumar |
| contents | 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 multi-band light curves from 1999 to 2025 with over 30 epochs of optical to near-infrared spectroscopy (0.5-2.5 $μ$m), 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 eleven major dips showing asymmetry and stochastic sub-structure. Color-magnitude diagrams show classic UXor-like blueing during deep minima, while near-infrared and mid-infrared color changes indicate thermal evolution of 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 $\sim10^{-8}-10^{-7}$ $M_\odot$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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_20085 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unveiling the Dual Nature of V1180 Cas: UXor-like Dips and EXor-like Bursts Across a Decade Chand, Tarak Sharma, Saurabh Singh, Koshvendra Ninan, Joe P. Ghosh, Arpan Ojha, Devendra K. Baug, Tapas Sahu, D. K. Bhatt, Bhuwan C. Kumar, Pramod Yadav, Ram K. Panwar, Neelam Verma, Aayushi Kaur, Harmeen Mamta Chakraborty, Manojit Gokhe, Kartik Singh, Ajay Kumar Solar and Stellar Astrophysics 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 multi-band light curves from 1999 to 2025 with over 30 epochs of optical to near-infrared spectroscopy (0.5-2.5 $μ$m), 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 eleven major dips showing asymmetry and stochastic sub-structure. Color-magnitude diagrams show classic UXor-like blueing during deep minima, while near-infrared and mid-infrared color changes indicate thermal evolution of 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 $\sim10^{-8}-10^{-7}$ $M_\odot$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. |
| title | Unveiling the Dual Nature of V1180 Cas: UXor-like Dips and EXor-like Bursts Across a Decade |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2512.20085 |