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. Hébrard; 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. Hébrard, 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. KeenanG.~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

Physics and Astronomy

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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 plusmn 0.000008 d, Transit Epoch T$_0$ = 2 455 342.9688 plusmn 0.0002 (HJD), of duration 0.1168 plusmn 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 plusmn 0.03 M$_J$ and a radius of R$_pl$ = 1.27 plusmn 0.04 R$_J$, resulting in a mean density of 0.14 plusmn 0.02 $$_J$. The stellar parameters are mass M$_⋆$ = 0.93 plusmn 0.03 M$_⊙$, radius R$_⋆$ = 0.895 plusmn 0.23 R$_⊙$, and age 9$^+3$$_-4$ 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 plusmn 0.1 dex, and we find the planet to have an equilibrium temperature of 1116$^+33$$_-32$ K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets. Spectroscopic and photometric data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A40

Original language	English
Pages (from-to)	A40
Journal	Astronomy and Astrophysics
Volume	531
DOIs	https://doi.org/10.1051/0004-6361/201116671
Publication status	Published - 1 Jul 2011

Keywords

stars: individual: WASP-39, techniques: photometric, techniques: radial velocities, planetary systems

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10.1051/0004-6361/201116671

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Faedi, F., Barros, S. C. C., Anderson, D. R., Brown, D. J. A., Collier Cameron, A., Pollacco, D., Boisse, I., Hébrard, 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, A40. https://doi.org/10.1051/0004-6361/201116671

@article{c963705785314f56b97e1094b9ffdb9b,

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 plusmn 0.000008 d, Transit Epoch T$_0$ = 2 455 342.9688 plusmn 0.0002 (HJD), of duration 0.1168 plusmn 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 plusmn 0.03 M$_J$ and a radius of R$_pl$ = 1.27 plusmn 0.04 R$_J$, resulting in a mean density of 0.14 plusmn 0.02 $$_J$. The stellar parameters are mass M$_⋆$ = 0.93 plusmn 0.03 M$_⊙$, radius R$_⋆$ = 0.895 plusmn 0.23 R$_⊙$, and age 9$^+3$$_-4$ 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 plusmn 0.1 dex, and we find the planet to have an equilibrium temperature of 1116$^+33$$_-32$ K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets. Spectroscopic and photometric data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A40 ",

keywords = "stars: individual: WASP-39, techniques: photometric, techniques: radial velocities, planetary systems",

author = "F. Faedi and S.~C.~C. Barros and D.~R. Anderson and D.~J.~A. Brown and {Collier Cameron}, A. and D. Pollacco and I. Boisse and G. H{\'e}brard and M. Lendl and T.~A. Lister and B. Smalley and R.~A. Street and A.~H.~M.~J. Triaud and J. Bento and F. Bouchy and O.~W. Butters and B. Enoch and C.~A. Haswell and C. Hellier and F.~P. Keenan and G.~R.~M. Miller and V. Moulds and C. Moutou and A.~J. Norton and D. Queloz and A. Santerne and E.~K. Simpson and I. Skillen and A.~M.~S. Smith and S. Udry and C.~A. Watson and R.~G. West and P.~J. Wheatley",

year = "2011",

month = jul,

day = "1",

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

language = "English",

volume = "531",

pages = "A40",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Faedi, F, Barros, SCC, Anderson, DR, Brown, DJA, Collier Cameron, A, Pollacco, D, Boisse, I, Hébrard, 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, pp. A40. 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 - Collier Cameron, A.

AU - Pollacco, D.

AU - Boisse, I.

AU - Hébrard, 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 - 2011/7/1

Y1 - 2011/7/1

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 plusmn 0.000008 d, Transit Epoch T$_0$ = 2 455 342.9688 plusmn 0.0002 (HJD), of duration 0.1168 plusmn 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 plusmn 0.03 M$_J$ and a radius of R$_pl$ = 1.27 plusmn 0.04 R$_J$, resulting in a mean density of 0.14 plusmn 0.02 $$_J$. The stellar parameters are mass M$_⋆$ = 0.93 plusmn 0.03 M$_⊙$, radius R$_⋆$ = 0.895 plusmn 0.23 R$_⊙$, and age 9$^+3$$_-4$ 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 plusmn 0.1 dex, and we find the planet to have an equilibrium temperature of 1116$^+33$$_-32$ K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets. Spectroscopic and photometric data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A40

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 plusmn 0.000008 d, Transit Epoch T$_0$ = 2 455 342.9688 plusmn 0.0002 (HJD), of duration 0.1168 plusmn 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 plusmn 0.03 M$_J$ and a radius of R$_pl$ = 1.27 plusmn 0.04 R$_J$, resulting in a mean density of 0.14 plusmn 0.02 $$_J$. The stellar parameters are mass M$_⋆$ = 0.93 plusmn 0.03 M$_⊙$, radius R$_⋆$ = 0.895 plusmn 0.23 R$_⊙$, and age 9$^+3$$_-4$ 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 plusmn 0.1 dex, and we find the planet to have an equilibrium temperature of 1116$^+33$$_-32$ K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets. Spectroscopic and photometric data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A40

KW - stars: individual: WASP-39, techniques: photometric, techniques: radial velocities, planetary systems

U2 - 10.1051/0004-6361/201116671

DO - 10.1051/0004-6361/201116671

M3 - Article

SN - 0004-6361

VL - 531

SP - A40

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

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

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