Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) - I. Detection of hot neutral sodium at high altitudes on WASP-49b

A. Wyttenbach; C. Lovis; D. Ehrenreich; V. Bourrier; L. Pino; R. Allart; N. Astudillo-Defru; H. M. Cegla; K. Heng; B. Lavie; C. Melo; F. Murgas; A. Santerne; D. Ségransan; S. Udry; F. Pepe

doi:10.1051/0004-6361/201630063

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Volume 602 (June 2017)

A&A, 602 (2017) A36

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Table 1

Adopted values for the orbital and physical parameters of the WASP-49 system.

Parameter	Value

Star: WASP-49
V mag	11.36
Spectral type	G6 v^*
M _⋆	1.003 ± 0.10 M_⊙ ^*
R_⋆	1.038 ± 0.038 R_⊙ ^*
T_eff	5600 ± 150 K^*^†
log g	4.5 ± 0.1^*^†
	−5.17 ± 0.02 ^‡

Transit
T ₀	2 456 267.68389 ± 0.00013 BJD_tdb ^*
P	2.7817362 ± 0.0000014 d^*
(R_p/R_⋆)²	0.01345 ± 0.00017 ^*
ΔT₁₋₄	2.14 ± 0.01 h^*
b	^*
a	0.03873 ± 0.00130 au^*
i	84.48° ± 0.13° ^*
u ₁ , u ₂	0.34,0.28 ^* ^§

Radial velocity
K ₁	57.5 ± 2.1 m s^-1^‡
e	0^‡
ω	90° ^‡
γ	41 726.1 ± 1.1 m s^-1^‡

Planet: WASP-49b
M _p	0.399 ± 0.030 M _J ^‡
R _p	1.198 ± 0.047 R _J ^*
ρ	0.288 ± 0.006 g cm^-3^‡
g _surf	689 ± 11 cm s^-2^‡
T _eq	1400 ± 80 K^‡^¶
H	730 ± 40 km^‡^¶
	230 ± 17 ppm^‡

Notes.

^(*)

Lendl et al. (2016).

^(†)

Stassun et al. (2017).

^(‡)

This work.

^(§)

Quadratic limb darkening from the NGTS filter.

^(¶)

For the planetary equilibrium temperature T_eq and the atmospheric scale height H, we assume an albedo A = 0, a redistribution factor f = 1 and a mean molecular weight μ_atm = 2.3.

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