High-energy spectra of LTT 1445A and GJ 486 reveal flares and activity

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Volume 689 (September 2024)

A&A, 689 (2024) A48

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Table 1

Parameters for the LTT 1445A and GJ 486 systems used in this work.

Star	Unit	LTT 1445A		GJ 486
Distance	pc	6.8638 ± 0.0012		8.0791 ± 0.0021
Radius	R_⊙	${0.265}_{- 0.010}^{+ 0.011}$ $0.265_{ - 0.010}^{ + 0.011}$		0.328 ± 0.011
Mass	M_⊙	0.257 ± 0.014		0.323 ± 0.015
T_eff	K	3340 ± 150		3340 ± 54

Planet		b	c	b

Radius	R_⊕	${1.305}_{- 0.061}^{+ 0.066}$ $1.305_{ - 0.061}^{ + 0.066}$	${1.147}_{- 0.054}^{+ 0.055}$ $1.147_{ - 0.054}^{ + 0.055}$	${1.305}_{- 0.067}^{+ 0.063}$ $1.305_{ - 0.067}^{ + 0.063}$
Mass	M_⊕	${2.87}_{- 0.25}^{+ 0.26}$ $2.87_{ - 0.25}^{ + 0.26}$	${1.54}_{- 0.19}^{+ 0.20}$ $1.54_{ - 0.19}^{ + 0.20}$	${2.82}_{- 0.12}^{+ 0.11}$ $2.82_{ - 0.12}^{ + 0.11}$
Density	g cm⁻³	${7.1}_{- 1.1}^{+ 1.2}$ $7.1_{ - 1.1}^{ + 1.2}$	${5.57}_{- 0.60}^{+ 0.68}$ $5.57_{ - 0.60}^{ + 0.68}$	${7.0}_{- 1.0}^{+ 1.2}$ $7.0_{ - 1.0}^{ + 1.2}$
a	AU	${0.03813}_{- 0.00070}^{+ 0.00068}$ $0.03813_{ - 0.00070}^{ + 0.00068}$	${0.02661}_{- 0.00049}^{+ 0.00047}$ $0.02661_{ - 0.00049}^{ + 0.00047}$	${0.01734}_{- 0.00027}^{+ 0.00026}$ $0.01734_{ - 0.00027}^{ + 0.00026}$
T_eq	K	424 ± 21	508 ± 25	701 ± 13

Notes. Distance values are from Gaia Data Release 3 (Gaia Collaboration 2023), otherwise values for the LTT 1445A system are from Winters et al. (2022) and values for GJ 486 are from Trifonov et al. (2021).

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