# Quiescence of an Outburst of a Low-Mass Young Stellar Object: LDN1415-IRS

**Authors:** Koshvendra Singh, Devendra K. Ojha, Joe P. Ninan, Saurabh Sharma, Supriyo Ghosh, Arpan Ghosh, Bhuwan C. Bhatt, Devendra K. Sahu  
**arXiv:** [2303.09118](https://arxiv.org/abs/2303.09118)  
**Date:** 2023-03-16  
**Summary page:** https://www.summarizepaper.com/en/arxiv-id/2303.09118v1/

## Key points

- Study focuses on LDN1415-IRS, a low-mass young stellar object (YSO) that experienced an outburst between 2001 and 2006
- Outburst led to significant brightening of surrounding nebula LDN1415-Neb by I=3.77 mag by April 2006
- Comprehensive analysis of optical light curve spanning approximately 15.5 years from October 2006 to January 2022
- Initial observations showed winds in the system through optical spectra, but subsequent spectra revealed no indicators of these winds
- Diminishing light curve and absence of P-Cygni profile suggest gradual return to quiescent state post-outburst
- Alignment of two Herbig-Haro objects (HHOs) with respect to optical brightness peak hints at possible edge-on view of circumstellar disk around LDN1415-IRS
- Recent deep near-infrared (NIR) imaging using TANSPEC discovered star-like source south of LDN1415-IRS at angular distance of approximately 5.4 arcsec

## Summary

In a recent study by Koshvendra Singh et al., titled "Quiescence of an Outburst of a Low-Mass Young Stellar Object: LDN1415-IRS," the authors delve into the intriguing case of LDN1415-IRS. This low-mass young stellar object (YSO) experienced a notable outburst between 2001 and 2006, which not only illuminated its surrounding nebula, known as LDN1415-Neb, but also led to a significant brightening of the nebula by I=3.77 mag by April 2006. The study provides a comprehensive analysis of the optical light curve spanning approximately 15.5 years, from October 2006 to January 2022. Initially, observations revealed the presence of winds in the system through optical spectra; however, subsequent spectra showed no indicators of these winds. The diminishing light curve and absence of the P-Cygni profile in later epoch spectra suggest that LDN1415-IRS and its associated nebula are gradually returning to a quiescent state following the outburst. Of particular interest are two Herbig-Haro objects (HHOs) strategically aligned with respect to the optical brightness peak of LDN1415-Neb. This alignment hints at a possible edge-on view of the circumstellar disk surrounding LDN1415-IRS. Furthermore, recent deep near-infrared (NIR) imaging using TANSPEC has unveiled the presence of a star-like source located south of LDN1415-IRS at an angular distance of approximately 5.4 arcsec. Overall, this study sheds light on the dynamic evolution and recovery process of LDN1415-IRS following its outburst phase, offering valuable insights into the mechanisms at play in young stellar objects and their surrounding environments.