Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720 b, TOI-6008 b, and TOI-6086 b

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Volume 687 (July 2024)

A&A, 687 (2024) A264

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Table 4

Planetary physical parameters determined from our global MCMC analysis (medians and 1σ error bar) for TOI-5720 b, TOI-6008 b, and TOI-6086 b.

Parameter	TOI-5720 b	TOI-6008 b	TOI-6086 b
Planet/star area ratio

(Rp/R_*)²_TESS [ppm]	$725_{- 186}^{+ 188}$ $\[725_{-186}^{+188}\]$	$1517_{+ 122}^{- 120}$ $\[1517_{+122}^{-120}\]$	$1531_{+ 376}^{- 370}$ $\[1531_{+376}^{-370}\]$
(R_p/R_*)²Sloan-z′ [ppm]	$989_{- 155}^{+ 156}$ $\[989_{-155}^{+156}\]$	$1431_{+ 151}^{- 150}$ $\[1431_{+151}^{-150}\]$	$1783_{+ 269}^{- 261}$ $\[1783_{+269}^{-261}\]$
(R_p/R_*)Sloan-i′ [ppm]	$723_{- 190}^{+ 193}$ $\[723_{-190}^{+193}\]$	$1591_{+ 188}^{- 186}$ $\[1591_{+188}^{-186}\]$	$1969_{+ 286}^{- 275}$ $\[1969_{+286}^{-275}\]$
(R_p/R_*)²Sloan-r′ [ppm]	$635_{- 223}^{+ 218}$ $\[635_{-223}^{+218}\]$	$1420_{+ 301}^{- 292}$ $\[1420_{+301}^{-292}\]$	$1639_{+ 405}^{- 401}$ $\[1639_{+405}^{-401}\]$
(R_p/R_*)²Sloan-g′ [ppm]	$724_{- 186}^{+ 188}$ $\[724_{-186}^{+188}\]$	$970_{+ 746}^{- 610}$ $\[970_{+746}^{-610}\]$	$2951_{+ 1902}^{- 1260}$ $\[2951_{+1902}^{-1260}\]$

Orbital period P [days]	1.4344555 ± 0.0000036	0.8574347 ± 0.0000424	1.3888725 ± 0.0000827
Transit-timing T₀ [BJD_TDB − 2450000]	10 076. 902501 ± 0.00067	10078.016214 ± 0.000311	10131.969501 ± 0.000567
Orbital semi-major axis a [AU]	0.018288 ± 0.000279	0.010777 ± 0.000162	0.01541 ± 0.00024
Impact parameter b [R_*]	0.14 ± 0.09	0.45 ± 0.08	0.608 ± 0.051
Transit duration W [min]	61 ± 2	39 ± 1	42 ± 2
Scaled semi-major axis a/R_*	10.97 ± 0.29	9.44 ± 0.21	12.75 ± 0.26
Orbital inclination i [deg]	89.3 ± 0.6	87.2 ± 0.5	87.3 ± 0.3
Radius ratio R_⊕/R_*	0.02796 ± 0.00158	0.03867 ± 0.00109	0.04173 ± 0.00220
Radius R_p [R_⊕]	1.09 ± 0.07	1.03 ± 0.05	1.18 ± 0.07
Irradiation S_p [S_⊕]	41.7 ± 4.5	41.5 ± 4.5	26.8 ± 2.7
^(a) Equilibrium temperature T_eq [K]	708 ± 19	707 ± 19	634 ± 16
^(b) Mass M_p [M_⊕]	<4.3	${1.1}_{- 0.9}^{+ 3.3}$ $\[1.1_{-0.9}^{+3.3}\]$	−
^(b) RV semi-amplitude K [m s⁻¹]	<64	${2.1}_{- 1.8}^{+ 5.9}$ $\[2.1_{-1.8}^{+5.9}\]$	−
^(c) Predicted mass M_p [M_⊕]	${1.32}_{- 0.47}^{+ 0.92}$ $\[1.32_{-0.47}^{+0.92}\]$	${1.10}_{- 0.36}^{+ 0.73}$ $\[1.10_{-0.36}^{+0.73}\]$	${1.68}_{- 0.56}^{+ 1.15}$ $\[1.68_{-0.56}^{+1.15}\]$
^(c) Predicted RV semi-amplitude K [m s⁻¹]	${1.4}_{- 0.5}^{+ 1.0}$ $\[1.4_{-0.5}^{+1.0}\]$	${2.0}_{- 0.6}^{+ 1.3}$ $\[2.0_{-0.6}^{+1.3}\]$	${2.4}_{- 0.8}^{+ 1.6}$ $\[2.4_{-0.8}^{+1.6}\]$
^(d) Predicted TSM	${9.7}_{- 4.1}^{+ 7.1}$ $\[9.7_{-4.1}^{+7.1}\]$	${18.8}_{- 6.8}^{+ 12.6}$ $\[18.8_{-6.8}^{+12.6}\]$	${12.0}_{- 4.7}^{+ 8.5}$ $\[12.0_{-4.7}^{+8.5}\]$
^(d) Predicted ESM	3.4 ± 0.5	6.4±0.7	4.2±0.7

Notes. ^(a)The equilibrium temperature derived assuming a null albedo. ^(b)Planetary mass and RV semi-amplitude values derived from RVs measurements collected by Subaru/IRD and TrES spectrographs for TOI-6008 b, and TOI-5720 b, respectively. ^(c)Predicted mass and RV semi-amplitude values calculated using the mass-radius relationship from Chen & Kipping (2017). ^(d)TSM (Transmission spectroscopy metric) and ESM (emission spectroscopy metric) values calculated from Kempton et al. (2018).

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