Rapid onset of a Comptonisation zone in the repeating tidal disruption event XMMSL2 J140446.9-251135

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Table 3.

Fits of a Comptonised black-body to XMM-Newton, Swift-XRT and SRG/eROSITA observations of 2MASX 1404-25.

Date	Key	kT^a	τ^b	Flux (0.2–2 keV)	C/d.o.f.
		eV		10⁻¹²ergs s⁻¹cm⁻²
2018-02-28	S1	$76_{- 5}^{+ 6}$ $76^{+6}_{-5}$	< 0.41	$2 . 46_{- 0.29}^{+ 0.30}$ $2.46^{+0.30}_{-0.29}$	39/50
2018-03-07	S2	80 ± 8	$0 . 44_{- 0.35}^{+ 0.28}$ $0.44^{+0.28}_{-0.35}$	$3 . 36_{- 0.31}^{+ 0.33}$ $3.36^{+0.33}_{-0.31}$	89/66
2018-03-12	S3	< 88	$1 . 88_{- 0.30}^{+ 0.50}$ $1.88^{+0.50}_{-0.30}$	$0 . 99_{- 0.28}^{+ 0.32}$ $0.99^{+0.32}_{-0.28}$	24/24
2018-03-19	S4	$77_{- 46}^{+ 27}$ $77^{+27}_{-46}$	$1 . 89_{- 0.49}^{+ 0.56}$ $1.89^{+0.56}_{-0.49}$	$1 . 50_{- 0.20}^{+ 0.23}$ $1.50^{+0.23}_{-0.20}$	76/81
2018-03-26	S5	< 98	$2 . 39_{- 0.66}^{+ 0.40}$ $2.39^{+0.40}_{-0.66}$	$3 . 20_{- 0.57}^{+ 0.65}$ $3.20^{+0.65}_{-0.57}$	65/65
2018-03-29	S6	< 72	$2 . 86_{- 0.47}^{+ 0.51}$ $2.86^{+0.51}_{-0.47}$	$2 . 48_{- 0.61}^{+ 0.75}$ $2.48^{+0.75}_{-0.61}$	34/34
2018-04-07	S7	< 91	$2 . 32_{- 0.92}^{+ 0.53}$ $2.32^{+0.53}_{-0.92}$	$3 . 51_{- 1.02}^{+ 1.01}$ $3.51^{+1.01}_{-1.02}$	37/29
2018-05-18	S8	< 98	$2 . 65_{- 0.73}^{+ 0.41}$ $2.65^{+0.41}_{-0.73}$	$1 . 98_{- 0.39}^{+ 0.42}$ $1.98^{+0.42}_{-0.39}$	43/63
2018-05-23	S9	< 55	$2 . 79_{- 0.20}^{+ 0.20}$ $2.79^{+0.20}_{-0.20}$	$2 . 28_{- 0.25}^{+ 0.28}$ $2.28^{+0.28}_{-0.25}$	117/120
2018-05-30	S10	< 59	$3 . 22_{- 0.21}^{+ 0.22}$ $3.22^{+0.22}_{-0.21}$	$2 . 25_{- 0.24}^{+ 0.26}$ $2.25^{+0.26}_{-0.24}$	135/140
2018-06-06	S11	$94_{- 50}^{+ 37}$ $94^{+37}_{-50}$	$2 . 54_{- 0.56}^{+ 0.56}$ $2.54^{+0.56}_{-0.56}$	$1 . 20_{- 0.16}^{+ 0.18}$ $1.20^{+0.18}_{-0.16}$	84/95
2018-06-13	S12	< 163	$3 . 1_{- 1.7}^{+ 1.0}$ $3.1^{+1.0}_{-1.7}$	$0 . 49_{- 0.14}^{+ 0.19}$ $0.49^{+0.19}_{-0.14}$	22/24
2018-07-17	X1	$50_{- 10}^{+ 9}$ $50^{+9}_{-10}$	$2 . 52_{- 0.15}^{+ 0.15}$ $2.52^{+0.15}_{-0.15}$	$0 . 27_{- 0.01}^{+ 0.01}$ $0.27^{+0.01}_{-0.01}$	147/145
2018-09-02^c	S13-S16	50^d	$2 . 1_{- 1.3}^{+ 1.6}$ $2.1^{+1.6}_{-1.3}$	$0 . 019_{- 0.013}^{+ 0.022}$ $0.019^{+0.022}_{-0.013}$	4.8/5
2019-01-10	X2	50^d	$3 . 61_{- 0.99}^{+ 1.35}$ $3.61^{+1.35}_{-0.99}$	$0 . 0042_{- 0.0013}^{+ 0.0014}$ $0.0042^{+0.0014}_{-0.0013}$	123/133
2020-01-26	eR1	50^d	$2 . 2_{- 0.5}^{+ 0.4}$ $2.2^{+0.4}_{-0.5}$	$0 . 49_{- 0.10}^{+ 0.09}$ $0.49^{+0.09}_{-0.10}$	50/55
2020-07-28	eR2	50^d	$3 . 8_{- 1.9}^{+ 1.2}$ $3.8^{+1.2}_{-1.9}$	$0 . 17_{- 0.06}^{+ 0.05}$ $0.17^{+0.05}_{-0.06}$	22/25
2022-01-26	eR5	50^d	$2 . 7_{- 0.7}^{+ 0.5}$ $2.7^{+0.5}_{-0.7}$	$0 . 51_{- 0.12}^{+ 0.10}$ $0.51^{+0.10}_{-0.12}$	41/45

Notes. Spectral fits to observations of 2MASX 1404-25, modelled by TBABS*COMPBB, consisting of a single-temperature black-body Comptonised by electrons with KT_e fixed at 5 keV, absorbed by the Galactic column of N_H = 6.7 × 10²⁰ cm⁻². Fits used cstat statistics, quoted errors and upper limits are 90% confidence.

^(a)

Observed black-body temperature returned by the fit. Note that this does not represent the physical temperature of the disc, whose emission can be better conceived as the sum of a set of black-bodies of different temperatures subject to multiple correction factors (Mummery 2021).

^(b)

Optical depth of a 5 keV plasma.

^(c)

Combination of observations S13–S16 (2018-08-23 – 2018-09-11).

^(d)

Black-body temperature fixed to kT = 50 eV.

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