XRISM/Xtend Transient Search (XTS) detected an X-ray flare from TWA 11

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https://www.astronomerstelegram.org/?read=17242

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http://hdl.handle.net/11603/40344

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

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Author/Creator ORCID

https://orcid.org/0000-0002-4656-6881

Date

2025-06-23

Type of Work

articles
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Citation of Original Publication

Pottschmidt, K., H. Sugai, K. Fukushima, et al. “XRISM/Xtend Transient Search (XTS) Detected an X-Ray Flare from TWA 11.” The Astronomer’s Telegram, June 23, 2025. https://www.astronomerstelegram.org/?read=17242.

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Abstract

XRISM/Xtend Transient Search (XTS) detected an X-ray flare from an X-ray source XRISM J1236-3952 on 2025-06-22 TT. The source position is determined to be (R.A., Dec.) = (189.005, -39.874), with a systematic error of ∼ 40 arcsec. A plausible counterpart is a Young Stellar Object Candidate TWA 11 (HD 109573). TWA 11 is located ∼ 13 arcsec apart from the position of XRISM J1236-3952 All statistical uncertainties in this report are provided as a 90% confidence level unless stated otherwise. The flare started at 2025-06-22 at ∼ 04:16 TT. The flare reached its peak on 2025-06-22 at ∼ 05:09. The flare exponentially decayed in 4 × 10³ sec. This source also showed fluctuations in flux within a range of ∼ 10 times during the observation conducted the day before. The peak flux is calculated as 1 × 10⁻¹¹ erg s⁻¹ cm⁻² (0.4 – 10.0 keV). A systematic error of roughly 20% should be added to the statistical error. The corresponding luminosity is 8 × D₇₀ₚ꜀ × 10³⁰ erg s⁻¹ by assuming the distance to XRISM J1236-3952 of D₆₇ₚ꜀. We derived the above systematic error for the flux by comparing our derived values for the sources detected with XTS in several observations with those for the corresponding X-ray counterparts. We estimated the systematic error for the source position from the separations between the detected sources with the corresponding counterparts in the same field of view.