New Eruptive YSOs from SPICY and WISE

• Published in: Journal of the Korean Astronomical Society, 56(2) Vol. 56; no. 2; pp. 253 - 262
• Main Authors: Carlos Contreras Pena, Mizna Ashraf, Jeong-Eun Lee, Gregory Herczeg, Phil Lucas, Zhen Guo, Doug Johnstone, Ho-Gyu Lee, Jessy Jose
• Format: Journal Article
• Language: English
• Published: 한국천문학회 01.07.2023
• Subjects: 천문학; Herbig Ae/Be — stars: formation; stars: pre-main sequence— stars: protostars— stars: variables: T Tauri
• ISSN: 1225-4614; 2288-890X
• DOI: 10.5303/JKAS.2023.56.2.253

This work presents four high-amplitude variable YSOs (≃3 mag at near- or mid-IR wavelengths) arising from the SPICY catalog. Three outbursts show a duration that is longer than 1 year, and are still ongoing. And additional YSO brightened over the last two epochs of NEOWISE observations and the duration of the outburst is thus unclear. Analysis of the spectra of the four sources confirms them as new members of the eruptive variable class. We find two YSOs that can be firmly classified as bona fide FUors and one object that falls in the V1647 Ori-like class. Given the uncertainty in the duration of its outburst, an additional YSO can only be classified as a candidate FUor. Continued monitoring and follow-up of these particular sources is important to better understand the accretion process of YSOs.