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

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Table C.1.

Fits of Comptonised thermal disc emission to XMM-Newton and Swift-XRT observations of 2MASX 1404-25

Date	Key	R_p^a	T_P^b	Γ^c	f_c^d	L_bol^e	C/dof
		10¹² cm	10⁵ K			10⁴³ergs s⁻¹
2018-02-28	S1	0.82	$5 . 96_{- 0.10}^{+ 0.10}$ $5.96^{+0.10}_{-0.10}$	-	< 0.022	59.8	42/50
		0.41	$7 . 33_{- 0.10}^{+ 0.14}$ $7.33^{+0.14}_{-0.10}$	-	< 0.01	34.2	45/50
		1.23	$5 . 27_{- 0.0}^{+ 0.11}$ $5.27^{+0.11}_{-0.0}$	-	< 0.044	83.2	52/50
2018-03-07	S2	0.82	$6 . 20_{- 0.12}^{+ 0.12}$ $6.20^{+0.12}_{-0.12}$	> 2.67	$0 . 048_{- 0.044}^{+ 0.028}$ $0.048^{+0.028}_{-0.044}$	71.9	95/66
		0.41	$7 . 79_{- 0.12}^{+ 0.12}$ $7.79^{+0.12}_{-0.12}$	-	< 0.0002	44.2	89/66
		1.23	$5 . 35_{- 0.13}^{+ 0.13}$ $5.35^{+0.13}_{-0.13}$	> 4.5	0.13	93.6	107/66
2018-03-12	S3	0.82	$4 . 50_{- 0.85}^{+ 0.50}$ $4.50^{+0.50}_{-0.85}$	> 2.1	$0 . 19_{- 0.18}^{+ 0.81}$ $0.19^{+0.81}_{-0.18}$	23.0	25/24
		0.41	$5 . 81_{1.00}^{+ 0.50}$ $5.81^{+0.50}_{1.00}$	$3 . 2_{- 1.8}^{+ 1.8}$ $3.2^{+1.8}_{-1.8}$	0.11	15.4	25/24
		1.23	$3 . 91_{- 0.76}^{+ 0.52}$ $3.91^{+0.52}_{-0.76}$	$3 . 8_{- 1.4}^{+ 1.2}$ $3.8^{+1.2}_{-1.4}$	0.22	29.8	25/24
2018-03-19	S4	0.82	$4 . 13_{- 0.20}^{+ 0.11}$ $4.13^{+0.11}_{-0.20}$	$3 . 8_{- 0.3}^{+ 0.2}$ $3.8^{+0.2}_{-0.3}$	$1 . 0_{- 0.61}^{+ 0}$ $1.0^{+0}_{-0.61}$	25.6	77/81
		0.41	$5 . 47_{- 0.20}^{+ 0.14}$ $5.47^{+0.14}_{-0.20}$	$4 . 1_{- 0.6}^{+ 0.2}$ $4.1^{+0.2}_{-0.6}$	1.0	18.8	76/81
		1.23	$3 . 53_{- 0.19}^{+ 0.08}$ $3.53^{+0.08}_{-0.19}$	$3 . 8_{- 0.3}^{+ 0.2}$ $3.8^{+0.2}_{-0.3}$	1.0	31.2	78/81
2018-03-26	S5	0.82	$4 . 62_{- 0.30}^{+ 1.12}$ $4.62^{+1.12}_{-0.30}$	$3 . 7_{- 0.6}^{+ 0.3}$ $3.7^{+0.3}_{-0.6}$	$1 . 0_{- 0.77}^{+ 0}$ $1.0^{+0}_{-0.77}$	42.4	65/65
		0.41	$6 . 55_{- 0.30}^{+ 0.75}$ $6.55^{+0.75}_{-0.30}$	$3 . 9_{- 1.0}^{+ 0.3}$ $3.9^{+0.3}_{-1.0}$	0.5	34.2	65/65
		1.23	$4 . 23_{- 0.20}^{+ 0.55}$ $4.23^{+0.55}_{-0.20}$	$3 . 5_{- 0.4}^{+ 0.4}$ $3.5^{+0.4}_{-0.4}$	0.6	55.8	65/65
2018-03-29	S6	0.82	$5 . 34_{- 1.02}^{+ 0.5}$ $5.34^{+0.5}_{-1.02}$	$2 . 5_{- 0.9}^{+ 0.9}$ $2.5^{+0.9}_{-0.9}$	$0 . 11_{- 0.09}^{+ 0.89}$ $0.11^{+0.89}_{-0.09}$	48.8	32/34
		0.41	$6 . 98_{- 0.80}^{+ 0.52}$ $6.98^{+0.52}_{-0.80}$	$2 . 1_{- 1.0}^{+ 1.0}$ $2.1^{+1.0}_{-1.0}$	0.07	36.0	30/34
		1.23	$4 . 61_{- 0.80}^{+ 0.49}$ $4.61^{+0.49}_{-0.80}$	$2 . 7_{- 0.8}^{+ 0.7}$ $2.7^{+0.7}_{-0.8}$	0.12	60.3	32/34
2018-04-07	S7	0.82	$6 . 12_{- 0.60}^{+ 0.36}$ $6.12^{+0.36}_{-0.60}$	$1 . 6_{- 1.6}^{+ 1.8}$ $1.6^{+1.8}_{-1.6}$	$0 . 01_{- 0.005}^{+ 0.21}$ $0.01^{+0.21}_{-0.005}$	75.3	33/29
		0.41	$7 . 72_{- 0.40}^{+ 0.38}$ $7.72^{+0.38}_{-0.40}$	$1 . 2_{- 1.1}^{+ 1.4}$ $1.2^{+1.4}_{-1.1}$	0.02	51.0	30/29
		1.23	$5 . 29_{- 1.10}^{+ 0.39}$ $5.29^{+0.39}_{-1.10}$	$2 . 3_{- 2.3}^{+ 1.8}$ $2.3^{+1.8}_{-2.3}$	0.03	92.4	31/29
2018-05-18	S8	0.82	$4 . 43_{- 0.30}^{+ 0.74}$ $4.43^{+0.74}_{-0.30}$	$3 . 3_{- 0.7}^{+ 0.4}$ $3.3^{+0.4}_{-0.7}$	$1 . 0_{- 0.89}^{+ 0}$ $1.0^{+0}_{-0.89}$	30.8	43/63
		0.41	$5 . 43_{- 0.40}^{+ 0.15}$ $5.43^{+0.15}_{-0.40}$	$3 . 5_{- 1.2}^{+ 0.4}$ $3.5^{+0.4}_{-1.2}$	1	21.0	43/63
		1.23	$3 . 45_{- 0.30}^{+ 0.08}$ $3.45^{+0.08}_{-0.30}$	$3 . 4_{- 0.8}^{+ 0.4}$ $3.4^{+0.4}_{-0.8}$	1	32.6	43/63
2018-05-23	S9	0.82	$4 . 90_{- 0.60}^{+ 0.34}$ $4.90^{+0.34}_{-0.60}$	$3 . 0_{- 0.4}^{+ 0.4}$ $3.0^{+0.4}_{-0.4}$	$0 . 27_{- 0.14}^{+ 0.73}$ $0.27^{+0.73}_{-0.14}$	38.9	116/120
		0.41	$6 . 46_{- 0.48}^{+ 0.32}$ $6.46^{+0.32}_{-0.48}$	$2 . 8_{- 0.4}^{+ 0.4}$ $2.8^{+0.4}_{-0.4}$	0.22	29.0	114/120
		1.23	$4 . 2_{- 0.48}^{+ 0.33}$ $4.2^{+0.33}_{-0.48}$	$3 . 1_{- 0.4}^{+ 0.2}$ $3.1^{+0.2}_{-0.4}$	0.29	47.3	116/120
2018-05-30	S10	0.82	$4 . 45_{- 0.40}^{+ 0.48}$ $4.45^{+0.48}_{-0.40}$	$2 . 7_{- 0.3}^{+ 0.3}$ $2.7^{+0.3}_{-0.3}$	$0 . 4_{- 0.22}^{+ 0.6}$ $0.4^{+0.6}_{-0.22}$	33.7	136/140
		0.41	$5 . 16_{- 0.20}^{+ 0.08}$ $5.16^{+0.08}_{-0.20}$	$2 . 7_{- 0.3}^{+ 0.3}$ $2.7^{+0.3}_{-0.3}$	1	22.8	137/140
		1.23	$3 . 85_{- 0.5}^{+ 0.28}$ $3.85^{+0.28}_{-0.5}$	$2 . 8_{- 0.3}^{+ 0.2}$ $2.8^{+0.2}_{-0.3}$	0.36	40.2	135/140
2018-06-06	S11	0.82	$3 . 43_{- 0.10}^{+ 0.11}$ $3.43^{+0.11}_{-0.10}$	$2 . 9_{- 0.3}^{+ 0.3}$ $2.9^{+0.3}_{-0.3}$	$1 . 0_{- 0.60}^{+ 0}$ $1.0^{+0}_{-0.60}$	17.5	88/95
		0.41	$4 . 66_{- 0.30}^{+ 0.14}$ $4.66^{+0.14}_{-0.30}$	$3 . 0_{- 0.3}^{+ 0.3}$ $3.0^{+0.3}_{-0.3}$	1	14.1	87/95
		1.23	$2 . 89_{- 0.2}^{+ 0.08}$ $2.89^{+0.08}_{-0.2}$	$3 . 0_{- 0.3}^{+ 0.3}$ $3.0^{+0.3}_{-0.3}$	1	19.9	88/95
2018-06-13	S12	0.82	$2 . 76_{- 0.58}^{+ 0.1}$ $2.76^{+0.1}_{-0.58}$	$2 . 8_{- 1.0}^{+ 0.6}$ $2.8^{+0.6}_{-1.0}$	$1 . 0_{- 0.97}^{+ 0}$ $1.0^{+0}_{-0.97}$	7.85	22/24
		0.41	$3 . 73_{- 0.60}^{+ 0.22}$ $3.73^{+0.22}_{-0.60}$	$2 . 8_{- 1.2}^{+ 0.6}$ $2.8^{+0.6}_{-1.2}$	1	6.3	22/24
		1.23	$2 . 53_{- 0.51}^{+ 0.10}$ $2.53^{+0.10}_{-0.51}$	$2 . 8_{- 1.0}^{+ 0.6}$ $2.8^{+0.6}_{-1.0}$	0.56	10.3	22/24
2018-07-17	X1	0.82	$2 . 91_{- 0.03}^{+ 0.02}$ $2.91^{+0.02}_{-0.03}$	$3 . 7_{- 0.1}^{+ 0.1}$ $3.7^{+0.1}_{-0.1}$	$1 . 0_{- 0.22}^{+ 0}$ $1.0^{+0}_{-0.22}$	6.6	162/145
		0.41	$3 . 82_{- 0.03}^{+ 0.02}$ $3.82^{+0.02}_{-0.03}$	$3 . 8_{- 0.1}^{+ 0.1}$ $3.8^{+0.1}_{-0.1}$	1	4.8	154/145
		1.23	$2 . 49_{- 0.03}^{+ 0.02}$ $2.49^{+0.02}_{-0.03}$	$3 . 6_{- 0.1}^{+ 0.1}$ $3.6^{+0.1}_{-0.1}$	1	8.2	166/145
2018-09-02^f	S13-S16	0.82	$1 . 82_{- 0.80}^{+ 0.33}$ $1.82^{+0.33}_{-0.80}$	$3 . 8_{- 1.6}^{+ 1.2}$ $3.8^{+1.2}_{-1.6}$	$1 . 0_{- 0.99}^{+ 0.0}$ $1.0^{+0.0}_{-0.99}$	0.99	5/4
		0.41	$2 . 28_{- 1.0}^{+ 2.23}$ $2.28^{+2.23}_{-1.0}$	$3 . 7_{- 1.5}^{+ 1.3}$ $3.7^{+1.3}_{-1.5}$	1	0.63	5/4
		1.23	$1 . 57_{- 0.79}^{+ 0.25}$ $1.57^{+0.25}_{-0.79}$	$3 . 8_{- 1.6}^{+ 1.2}$ $3.8^{+1.2}_{-1.6}$	1	1.24	5/4
2019-01-10	X2	0.82	$1 . 47_{- 0.40}^{+ 0.71}$ $1.47^{+0.71}_{-0.40}$	$2 . 9_{- 0.7}^{+ 0.7}$ $2.9^{+0.7}_{-0.7}$	$0 . 22_{- 0.20}^{+ 0.78}$ $0.22^{+0.78}_{-0.20}$	0.31	124/132
		0.41	$1 . 38_{- 0.30}^{+ 0.08}$ $1.38^{+0.08}_{-0.30}$	$2 . 9_{- 0.6}^{+ 0.7}$ $2.9^{+0.7}_{-0.6}$	1	0.12	124/132
		1.23	$1 . 56_{- 0.80}^{+ 0.46}$ $1.56^{+0.46}_{-0.80}$	$2 . 9_{- 0.6}^{+ 0.7}$ $2.9^{+0.7}_{-0.6}$	1	0.70	124/132

Notes. Spectral fits to observations of 2MASX 1404-25, modelled by TBABS*SIMPL*TDEDISCSPEC, consisting of photons from a thermally emitting disc, Compton-upscattered into a simple power-law, absorbed by the Galactic column of N_H = 6.7 × 10²⁰ cm⁻². The TDEDISCSPEC model is used with the index γ fixed to 0.5 for a face-on disc with the temperature maximum inside the disc body, luminosity distance, D_L = 190Mpc, and normalisation = 1. The photon power-law index, Γ is left free in SIMPL and the model is used in upscattering-only mode. Fits used cstat statistics, quoted errors are 90% confidence.

^(a)

R_P is the radius where the disc emits the peak temperature. This is fixed at values of 0.82, 0.41, and 1.23 ×10¹²cm using the relation given in equation 13 of Mummery et al. (2023), corresponding to the black hole mass range adopted in appendix B, $M_{BH} = 4_{- 2}^{+ 2} \times 10^{6} M_{⊙}$ $M_{BH} = 4^{+2}_{-2}\times10^{6}\,M_{\odot}$ .

^(b)

Peak intrinsic temperature of the disc.

^(c)

Slope of the SIMPL power-law component.

^(d)

Fraction of scattered photons.

^(e)

Bolometric luminosity. Due to simplifications in the treatment of photons outside of the X-ray band by TDEDISCSPEC, XSPEC itself can not be used to calculate the integrated bolometric luminosity of the model. We have used equation 13 of Mummery et al. (2023) to calculate the disc luminosity from values of R_P and T_P and have used XSPEC to calculate the extra luminosity contained in the upscattered photons.

^(f)

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

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