WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star

F. Faedi; S. C. C. Barros; D. R. Anderson; D. J. A. Brown; A. Collier Cameron; D. Pollacco; I. Boisse; G. Hebrard; M. Lendl; T. A. Lister; B. Smalley; R. A. Street; A. H. M. J. Triaud; J. Bento; F. Bouchy; O. W. Butters; B. Enoch; C. A. Haswell; C. Hellier; F. P. Keenan; G. R. M. Miller; V. Moulds; C. Moutou; A. J. Norton; D. Queloz; A. Santerne; E. K. Simpson; I. Skillen; A. M. S. Smith; S. Udry; C. A. Watson; R. G. West; P. J. Wheatley

doi:10.1051/0004-6361/201116671

WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star

F. Faedi^*
, S. C. C. Barros
, D. R. Anderson
, D. J. A. Brown
, A. Collier Cameron
, D. Pollacco
, I. Boisse
, G. Hebrard
, M. Lendl
, T. A. Lister
, B. Smalley
, R. A. Street
, A. H. M. J. Triaud
, J. Bento
, F. Bouchy
, O. W. Butters
, B. Enoch
, C. A. Haswell
, C. Hellier
, F. P. Keenan

G. R. M. Miller, V. Moulds, C. Moutou, A. J. Norton, D. Queloz, A. Santerne, E. K. Simpson, I. Skillen, A. M. S. Smith, S. Udry, C. A. Watson, R. G. West, P. J. Wheatley

^*Corresponding author for this work

Bristol Medical School (PHS)

Research output: Contribution to journal › Article (Academic Journal) › peer-review

118 Citations (Scopus)

Abstract

We present the discovery of WASP-39b, a highly inflated transiting Saturn-mass planet orbiting a late G-type dwarf star with a period of 4.055259 +/- 0.000008 d, Transit Epoch T-0 = 2 455 342.9688 +/- 0.0002 (HJD), of duration 0.1168 +/- 0.0008 d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of M-pl = 0.28 +/- 0.03 M-J and a radius of R-pl = 1.27 +/- 0.04 R-J, resulting in a mean density of 0.14 +/- 0.02 rho(J). The stellar parameters are mass M-star = 0.93 +/- 0.03 M-circle dot, radius R-star = 0.895 +/- 0.23 R-circle dot, and age 9(-4)(+3) Gyr. Only WASP-17b and WASP-31b have lower densities than WASP-39b, although they are slightly more massive and highly irradiated planets. From our spectral analysis, the metallicity of WASP-39 is measured to be [Fe/H] = -0.12 +/- 0.1 dex, and we find the planet to have an equilibrium temperature of 1116(-32)(+33) K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets.

Original language	English
Article number	40
Number of pages	8
Journal	Astronomy and Astrophysics
Volume	531
DOIs	https://doi.org/10.1051/0004-6361/201116671
Publication status	Published - Jul 2011

Keywords

stars: individual: WASP-39
techniques: photometric
techniques: radial velocities
planetary systems
TRANSITING EXTRASOLAR PLANETS
STELLAR ATMOSPHERE MODELS
LIMB-DARKENING LAW
LOW-DENSITY
GIANT PLANETS
LIGHT CURVES
IMPROVED PARAMETERS
SURFACE GRAVITIES
HOT JUPITERS
RADII

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Faedi, F., Barros, S. C. C., Anderson, D. R., Brown, D. J. A., Cameron, A. C., Pollacco, D., Boisse, I., Hebrard, G., Lendl, M., Lister, T. A., Smalley, B., Street, R. A., Triaud, A. H. M. J., Bento, J., Bouchy, F., Butters, O. W., Enoch, B., Haswell, C. A., Hellier, C., ... Wheatley, P. J. (2011). WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star. Astronomy and Astrophysics, 531, Article 40. https://doi.org/10.1051/0004-6361/201116671

@article{189fca836ea44bebb6d6d588b6bf63a7,

title = "WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star",

abstract = "We present the discovery of WASP-39b, a highly inflated transiting Saturn-mass planet orbiting a late G-type dwarf star with a period of 4.055259 +/- 0.000008 d, Transit Epoch T-0 = 2 455 342.9688 +/- 0.0002 (HJD), of duration 0.1168 +/- 0.0008 d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of M-pl = 0.28 +/- 0.03 M-J and a radius of R-pl = 1.27 +/- 0.04 R-J, resulting in a mean density of 0.14 +/- 0.02 rho(J). The stellar parameters are mass M-star = 0.93 +/- 0.03 M-circle dot, radius R-star = 0.895 +/- 0.23 R-circle dot, and age 9(-4)(+3) Gyr. Only WASP-17b and WASP-31b have lower densities than WASP-39b, although they are slightly more massive and highly irradiated planets. From our spectral analysis, the metallicity of WASP-39 is measured to be [Fe/H] = -0.12 +/- 0.1 dex, and we find the planet to have an equilibrium temperature of 1116(-32)(+33) K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets.",

keywords = "stars: individual: WASP-39, techniques: photometric, techniques: radial velocities, planetary systems, TRANSITING EXTRASOLAR PLANETS, STELLAR ATMOSPHERE MODELS, LIMB-DARKENING LAW, LOW-DENSITY, GIANT PLANETS, LIGHT CURVES, IMPROVED PARAMETERS, SURFACE GRAVITIES, HOT JUPITERS, RADII",

author = "F. Faedi and Barros, \{S. C. C.\} and Anderson, \{D. R.\} and Brown, \{D. J. A.\} and Cameron, \{A. Collier\} and D. Pollacco and I. Boisse and G. Hebrard and M. Lendl and Lister, \{T. A.\} and B. Smalley and Street, \{R. A.\} and Triaud, \{A. H. M. J.\} and J. Bento and F. Bouchy and Butters, \{O. W.\} and B. Enoch and Haswell, \{C. A.\} and C. Hellier and Keenan, \{F. P.\} and Miller, \{G. R. M.\} and V. Moulds and C. Moutou and Norton, \{A. J.\} and D. Queloz and A. Santerne and Simpson, \{E. K.\} and I. Skillen and Smith, \{A. M. S.\} and S. Udry and Watson, \{C. A.\} and West, \{R. G.\} and Wheatley, \{P. J.\}",

year = "2011",

month = jul,

doi = "10.1051/0004-6361/201116671",

language = "English",

volume = "531",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Faedi, F, Barros, SCC, Anderson, DR, Brown, DJA, Cameron, AC, Pollacco, D, Boisse, I, Hebrard, G, Lendl, M, Lister, TA, Smalley, B, Street, RA, Triaud, AHMJ, Bento, J, Bouchy, F, Butters, OW, Enoch, B, Haswell, CA, Hellier, C, Keenan, FP, Miller, GRM, Moulds, V, Moutou, C, Norton, AJ, Queloz, D, Santerne, A, Simpson, EK, Skillen, I, Smith, AMS, Udry, S, Watson, CA, West, RG & Wheatley, PJ 2011, 'WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star', Astronomy and Astrophysics, vol. 531, 40. https://doi.org/10.1051/0004-6361/201116671

TY - JOUR

T1 - WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star

AU - Faedi, F.

AU - Barros, S. C. C.

AU - Anderson, D. R.

AU - Brown, D. J. A.

AU - Cameron, A. Collier

AU - Pollacco, D.

AU - Boisse, I.

AU - Hebrard, G.

AU - Lendl, M.

AU - Lister, T. A.

AU - Smalley, B.

AU - Street, R. A.

AU - Triaud, A. H. M. J.

AU - Bento, J.

AU - Bouchy, F.

AU - Butters, O. W.

AU - Enoch, B.

AU - Haswell, C. A.

AU - Hellier, C.

AU - Keenan, F. P.

AU - Miller, G. R. M.

AU - Moulds, V.

AU - Moutou, C.

AU - Norton, A. J.

AU - Queloz, D.

AU - Santerne, A.

AU - Simpson, E. K.

AU - Skillen, I.

AU - Smith, A. M. S.

AU - Udry, S.

AU - Watson, C. A.

AU - West, R. G.

AU - Wheatley, P. J.

PY - 2011/7

Y1 - 2011/7

N2 - We present the discovery of WASP-39b, a highly inflated transiting Saturn-mass planet orbiting a late G-type dwarf star with a period of 4.055259 +/- 0.000008 d, Transit Epoch T-0 = 2 455 342.9688 +/- 0.0002 (HJD), of duration 0.1168 +/- 0.0008 d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of M-pl = 0.28 +/- 0.03 M-J and a radius of R-pl = 1.27 +/- 0.04 R-J, resulting in a mean density of 0.14 +/- 0.02 rho(J). The stellar parameters are mass M-star = 0.93 +/- 0.03 M-circle dot, radius R-star = 0.895 +/- 0.23 R-circle dot, and age 9(-4)(+3) Gyr. Only WASP-17b and WASP-31b have lower densities than WASP-39b, although they are slightly more massive and highly irradiated planets. From our spectral analysis, the metallicity of WASP-39 is measured to be [Fe/H] = -0.12 +/- 0.1 dex, and we find the planet to have an equilibrium temperature of 1116(-32)(+33) K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets.

AB - We present the discovery of WASP-39b, a highly inflated transiting Saturn-mass planet orbiting a late G-type dwarf star with a period of 4.055259 +/- 0.000008 d, Transit Epoch T-0 = 2 455 342.9688 +/- 0.0002 (HJD), of duration 0.1168 +/- 0.0008 d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of M-pl = 0.28 +/- 0.03 M-J and a radius of R-pl = 1.27 +/- 0.04 R-J, resulting in a mean density of 0.14 +/- 0.02 rho(J). The stellar parameters are mass M-star = 0.93 +/- 0.03 M-circle dot, radius R-star = 0.895 +/- 0.23 R-circle dot, and age 9(-4)(+3) Gyr. Only WASP-17b and WASP-31b have lower densities than WASP-39b, although they are slightly more massive and highly irradiated planets. From our spectral analysis, the metallicity of WASP-39 is measured to be [Fe/H] = -0.12 +/- 0.1 dex, and we find the planet to have an equilibrium temperature of 1116(-32)(+33) K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets.

KW - stars: individual: WASP-39

KW - techniques: photometric

KW - techniques: radial velocities

KW - planetary systems

KW - TRANSITING EXTRASOLAR PLANETS

KW - STELLAR ATMOSPHERE MODELS

KW - LIMB-DARKENING LAW

KW - LOW-DENSITY

KW - GIANT PLANETS

KW - LIGHT CURVES

KW - IMPROVED PARAMETERS

KW - SURFACE GRAVITIES

KW - HOT JUPITERS

KW - RADII

U2 - 10.1051/0004-6361/201116671

DO - 10.1051/0004-6361/201116671

M3 - Article (Academic Journal)

SN - 0004-6361

VL - 531

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - 40

ER -

WASP-39b: a highly inflated Saturn-mass planet orbiting a late G-type star

Abstract

Keywords

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