Evolution of BD-14 3065b (TOI-4987b) from giant planet to brown dwarf as possible evidence of deuterium burning at old stellar ages

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Volume 688 (August 2024)

A&A, 688 (2024) A120

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Table 4

Derived parameters from the allesfitter analysis.

Parameter	Value
Derived parameters: 2-star model

Host radius over semi-major axis b; R_*/a_b	${0.1664}_{- 0.0032}^{+ 0.0037}$ $\[0.1664_{-0.0332}^{+0.0037}\]$
Semi-major axis b over host radius; a_b/R*	${6.01}_{- 0.13}^{+ 0.12}$ $\[6.01_{-0.13}^{+0.12}\]$
Companion radius b over semi-major axis b; R_b/a_b	${0.01403}_{- 0.00047}^{+ 0.00060}$ $\[0.01403_{-0.00047}^{+0.00060}\]$
Companion radius b; R_b (R_⊕)	21.59 ± 1.05
Companion radius b; R_b (R_jup)	1.926 ± 0.094
Semi-major axis b; a_b (R_⊙)	14.11 ± 0.57
Semi-major axis b; a_b (AU)	0.0656 ± 0.0026
Inclination b; i_b (deg)	${80.78}_{- 0.30}^{+ 0.24}$ $\[80.78_{-0.30}^{+0.24}\]$
Eccentricity b; e_b	${0.0660}_{- 0.011}^{+ 0.0098}$ $\[0.0660_{-0.011}^{+0.0098}\]$
Argument of periastron b; w_b (deg)	${54.0}_{- 9.1}^{+ 6.0}$ $\[54.0_{-9.1}^{+6.0}\]$
Mass ratio b; q_b	${0.00838}_{- 0.00052}^{+ 0.00055}$ $\[0.00838_{-0.00052}^{+0.00055}\]$
Companion mass b; M_b (M_⊕)	$3932_{- 280}^{+ 290}$ $\[3932_{-280}^{+290}\]$
Companion mass b; M_b (M_jup)	${12.37}_{- 0.87}^{+ 0.92}$ $\[12.37_{-0.87}^{+0.92}\]$
Companion mass b; M_b (M_⊙)	${0.01181}_{- 0.00083}^{+ 0.00088}$ $\[0.01181_{-0.00083}^{+0.00088}\]$
Impact parameter b; b_tra;b	${0.9099}_{- 0.0079}^{+ 0.0092}$ $\[0.9099_{-0.0079}^{+0.0092}\]$
Total transit duration b; T_tot;b (h)	3.086 ± 0.041
Full-transit duration b; T_full;b (h)	${0.61}_{- 0.22}^{+ 0.19}$ $\[0.61_{-0.22}^{+0.19}\]$
Epoch occultation b; T_0;occ;b	${2315.7361}_{- 0.0074}^{+ 0.0084}$ $\[2315.7361_{-0.0074}^{+0.0084}\]$
Impact parameter occultation b; b_occ;b	${1.013}_{- 0.024}^{+ 0.020}$ $\[1.013_{-0.024}^{+0.020}\]$
Host density from orbit b; ρ_*;b (cgs)	${0.223}_{- 0.014}^{+ 0.013}$ $\[0.223_{-0.014}^{+0.013}\]$
Companion density b; ρ_b (cgs)	${2.15}_{- 0.48}^{+ 0.53}$ $\[2.15_{-0.48}^{+0.53}\]$
Companion surface gravity b; g_b (cgs)	10536 ± 950
Equilibrium temperature b; T_eq;b (K)¹	2001 ± 31
Transit depth (undil.) b; δ_tr;_undil;b;TESS (ppt)	${6.49}_{- 0.20}^{+ 0.23}$ $\[6.49_{-0.20}^{+0.23}\]$
Transit depth (dil.) b; δ_tr;dil;b;_TESS (ppt)	${5.80}_{- 0.11}^{+ 0.14}$ $\[5.80_{-0.11}^{+0.14}\]$
Occultation depth (undil.) b; δ_occ;_undil;b;TESS (ppt)	${0.482}_{- 0.11}^{+ 0.091}$ $\[0.482_{-0.11}^{+0.091}\]$
Occultation depth (dil.) b; δ_occ;_dil;b;TESS (ppt)	${0.431}_{- 0.096}^{+ 0.081}$ $\[0.431_{-0.096}^{+0.081}\]$

Derived parameters: 3-star model

Host radius over semi-major axis b; R*/a_b	${0.1570}_{- 0.0027}^{+ 0.0028}$ $\[0.1570_{-0.0027}^{+0.0028}\]$
Semi-major axis b over host radius; a_b/R*	6.37 ± 0.11
Companion radius b over semi-major axis b; R_b/a_b	${0.01414}_{- 0.00045}^{+ 0.00047}$ $\[0.01414_{-0.00045}^{+0.00047}\]$
Companion radius b; R_b (R_⊕)	21.41 ± 1.05
Companion radius b; R_b (R_jup)	1.910 ± 0.094
Semi-major axis b; a_b (R_⊙)	13.88 ± 0.57
Semi-major axis b; a_b (AU)	0.0646 ± 0.0026
Inclination b; i_b (deg)	81.40 ± 0.22
Eccentricity b; e_b	${0.0702}_{- 0.011}^{+ 0.0096}$ $\[0.0702_{-0.011}^{+0.0096}\]$
Argument of periastron b; w_b (deg)	${56.2}_{- 7.2}^{+ 4.7}$ $\[56.2_{-7.2}^{+4.7}\]$
Mass ratio b; q_b	0.00826 ± 0.00056
Companion mass b; M_b (M_⊕)	$3850_{- 290}^{+ 300}$ $\[3850_{-290}^{+300}\]$
Companion mass b; M_b (M_jup)	${12.11}_{- 0.91}^{+ 0.95}$ $\[12.11_{-0.91}^{+0.95}\]$
Companion mass b; M_b (M_⊙)	${0.01156}_{- 0.00087}^{+ 0.00091}$ $\[0.01156_{-0.00087}^{+0.00091}\]$
Impact parameter b; b_tra;b	0.8959 ± 0.0067
Total transit duration b; T_tot;b (h)	3.052 ± 0.042
Full-transit duration b; T_full;b (h)	${0.78}_{- 0.17}^{+ 0.14}$ $\[0.78_{-0.17}^{+0.14}\]$
Epoch occultation b; T_0;occ;b	2315.7365 ± 0.0070
Impact parameter occultation b; b_occ;b	${1.007}_{- 0.024}^{+ 0.019}$ $\[1.007_{-0.024}^{+0.019}\]$
Host density from orbit b; ρ_*;b (cgs)	0.266 ± 0.014
Companion density b; ρ_b (cgs)	${2.16}_{- 0.31}^{+ 0.37}$ $\[2.16_{-0.31}^{+0.37}\]$
Companion surface gravity b; g_b (cgs)	10270 ± 850
Equilibrium temperature b; T_eq;b (K)⁽¹⁾	1957 ± 28
Transit depth (undil.) b; δ_tr_{;undil;b;TESS} (ppt)	${7.42}_{- 0.12}^{+ 0.13}$ $\[7.42_{-0.12}^{+0.13}\]$
Transit depth (dil.) b; δ_{tr;dil;b;TESS} (ppt)	${5.741}_{- 0.092}^{+ 0.10}$ $\[5.741_{-0.092}^{+0.10}\]$
Occultation depth (undil.) b; δ_occ;_undil;b;TESS (ppt)	0.57 ± 0.12
Occultation depth (dil.) b; δ_occ;_;dil;b;TESS (ppt)	0.442 ± 0.089

Notes. (1) – computed assuming zero albedo.

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