TABLE 1 XO3 Results Parameter Value Units RV Step Parameters ...

1 TABLE 2 Priors

TABLE 1 XO3 Results Parameter

Value

RV Step Parameters log(Pb ) 0.50399877 ±4.3e − 07 Tc,b 2454864.7668 ±0.0004 √ eb cos ωb 0.5085 +0.0056 −0.0058 √ eb sin ωb -0.151 +0.025 −0.023 log(Kb ) 3.1611 +0.0063 −0.0059 γ1 -186 +19 −21 γ2 942 ±60 γ3 -229 +61 −60 γ˙ -0.046 +0.028 −0.026 γ ¨ ≡ 0.0 ±0.0 jitter 47 +15 −11 RV Model Parameters Pb 3.1915288 ±3.2e − 06 Tc,b 2454864.7668 ±0.0004 eb 0.2817 +0.0056 −0.0055 ωb 351.3 +1.4 −1.3 Kb 1449 +21 −20 γ1 -186 +19 −21 γ2 942 ±60 γ3 -229 +61 −60 γ˙ -0.046 +0.028 −0.026 γ ¨ ≡ 0.0 ±0.0 jitter 47 +15 −11 RV Derived Parameters e cos ω 0.2784 ±0.0049 e sin ω -0.0424 +0.0073 −0.007 95540 links saved Reference epoch for γ,γ,¨ ˙ γ : 2455101.0

Units

log(days) BJDTDB

m s−1 m s−1 m s−1 m s−1 m s−1 day−1 m s−1 day−2 m s−1 days BJDTDB degrees m s−1 m s−1 m s−1 m s−1 m s−1 day−1 m s−1 day−2 m s−1

Parameter Pb Tc,b Ts1 Ts2

Prior

Width

Units

3.1915289 2454864.7668 2454908.402 2454943.51

3.2e-06 0.0004 0.017 0.02

days BJDTDB BJDTDB BJDTDB

2

Residuals

−𝟣

RV [m s ]

2000 1500 1000 500 0 −500 −1000 500 0 −300

14000

14500

14000

14500

2000

15000

15500

16000

15000

15500

16000

BJD

𝖳𝖣𝖡

− 2440000

P𝘣 = 3.19 days K𝘣 = 1441.16 m s e𝘣 = 0.28 M𝘣𝗌𝗂𝗇𝘪𝘣 = 10.01 M 𝖬

1500

−𝟣

−𝟣

RV [m s ]

1000

𝟤/𝟥

𝖩

⋆

500 0

−500

−1000 −1500

−0.4

−0.2

0.0

0.2

Phase

0.4

Fig. 1.— Best-fitting model.

14000

+𝟢.𝟢𝟤𝟫𝟢𝟩𝟪 −𝟢.𝟢𝟦𝟧𝟪𝟢𝟩−𝟢.𝟢𝟤𝟨𝟢𝟪𝟢

12000

10000

8000

6000

4000

2000

0 −0.20 −0.15 −0.10 −0.05

Fig. 2.— Posterior distribution for γ. ˙

0.00

0.05

0.10

0.15

0.20

3

Fig. 3.— All step parameters.