LEIA detected the X-ray flare from the nova ASASSN-23hd
ATel #16334; X. P. Xu (NAOC, CAS), H. N. Yang (NAOC, CAS), M. J. Liu (NAOC, CAS), X. Pan (NAOC, CAS), Y. Liu (NAOC, CAS), Z. X. Ling (NAOC, CAS), C. Zhang (NAOC, CAS), W. Chen (NAOC, CAS), H. Q. Cheng (NAOC, CAS), C. Z. Cui (NAOC, CAS), D. W. Fan (NAOC, CAS), H. B. Hu (NAOC, CAS), J. W. Hu (NAOC, CAS), M. H. Huang (NAOC, CAS), C. C. Jin (NAOC, CAS), D. M. Li (BNU), D. Y. Li (NAOC, CAS), Q. X. Li (BNU), T. Y. Lian (NAOC, CAS), H. Y. Liu (NAOC, CAS), Z. Z. Lv (NAOC, CAS), X. Mao (NAOC, CAS), H. W. Pan (NAOC, CAS), H. Sun (NAOC, CAS), C. Y. Wang (THU), W. X. Wang (NAOC, CAS), Y. L. Wang (NAOC, CAS), Q. Y. Wu (NAOC, CAS), Y. F. Xu (NAOC, CAS), M. Zhang (NAOC, CAS), W. D. Zhang (NAOC, CAS), W. J. Zhang (NAOC, CAS), Y. J. Zhang (THU), D. H. Zhao (NAOC, CAS) and W. Yuan (NAOC, CAS), on behalf of the LEIA and Einstein Probe team
on 14 Nov 2023; 09:24 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Yuan Liu (liuyuan@bao.ac.cn)
Subjects: X-ray, Nova, Transient
We report on LEIA detections of the X-ray flare from the transient ASASSN-23hd in the LMC, which was initially discovered by ASAS-SN on 2023-10-13, and then was classified as a classical nova by SOAR spectroscopic follow-up on 2023-10-15 (ATel #16294).
LEIA firstly detected this source at 2023-11-07T01:28:08 with a 0.5-4 keV flux of ~4.3e-11 erg/s/cm^2, and continuous brightening were detected until 2023-11-12T18:16:08 with a peak 0.5-4 keV flux of ~8.4e-11 erg/s/cm^2. ASASSN-23hd had formerly been monitored by Swift/XRT from 2023-10-18 till 2023-11-1, of which the last observation gave a 0.5-4 keV flux of ~4.8e-13erg/s/cm^2. New XRT observations of this source had been carried out since 2023-11-11. We looked into the recent observation at 2023-11-11T17:45:57 (obs ID: 00016292009, 650s exposure time in Windowed Timing mode), and used an absorbed apec plus blackbody (the column density is fixed to 1.1e21 cm^-2) to fit the 0.3-10 keV spectrum, the fitted model gave an absorbed flux of ~8.6e-11 erg/s/cm^2 in the 0.5-4 keV band, which is consistent with the flux given by LEIA.
The continuous brightening in X-ray indicates that the outburst of this nova is still in progress and more follow-up observations are encouraged.
LEIA (Zhang et al, ApJL, 941, 2) is a soft X-ray Lobster-eye imager (0.5 - 4.0 keV) with a FoV of 340 square degrees aboard the SATech-01 satellite of CAS, launched on July 27, 2022.
