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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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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 ± 0.000008 d, Transit Epoch T₀ = 2 455 342.9688 ± 0.0002(HJD), of duration 0.1168 ± 0.0008d. 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 ρ_J. The stellar parameters are mass M= 0.93 ± 0.03 M, radius R= 0.895 ± 0.23 R, and age 9⁺³_-4Gyr. 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⁺³³_-32K. 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	A40
Pages (from-to)	1-8
Number of pages	8
Journal	Astronomy and Astrophysics
Volume	531
DOIs	https://doi.org/10.1051/0004-6361/201116671
Publication status	Published - 2011
Externally published	Yes

Keywords

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

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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, 1-8. [A40]. https://doi.org/10.1051/0004-6361/201116671

@article{0de5d558e0a84b289dd2fe3f1d8d2c09,

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 T0 = 2 455 342.9688 ± 0.0002(HJD), of duration 0.1168 ± 0.0008d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of Mpl = 0.28 ± 0.03 M J and a radius of Rpl = 1.27 ± 0.04 RJ, resulting in a mean density of 0.14 ± 0.02 ρJ. The stellar parameters are mass M= 0.93 ± 0.03 M, radius R= 0.895 ± 0.23 R, and age 9+3-4Gyr. 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+33-32K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets.",

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

author = "F. Faedi and Barros, {S. C C} and Anderson, {D. R.} and Brown, {D. J A} and {Collier Cameron}, A. and D. Pollacco and I. Boisse and G. H{\'e}brard 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",

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

language = "English",

volume = "531",

pages = "1--8",

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, A40, pp. 1-8. https://doi.org/10.1051/0004-6361/201116671

TY - JOUR

T1 - WASP-39b

T2 - 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

Y1 - 2011

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 T0 = 2 455 342.9688 ± 0.0002(HJD), of duration 0.1168 ± 0.0008d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of Mpl = 0.28 ± 0.03 M J and a radius of Rpl = 1.27 ± 0.04 RJ, resulting in a mean density of 0.14 ± 0.02 ρJ. The stellar parameters are mass M= 0.93 ± 0.03 M, radius R= 0.895 ± 0.23 R, and age 9+3-4Gyr. 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+33-32K. 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 T0 = 2 455 342.9688 ± 0.0002(HJD), of duration 0.1168 ± 0.0008d. A combined analysis of the WASP photometry, high-precision follow-up transit photometry, and radial velocities yield a planetary mass of Mpl = 0.28 ± 0.03 M J and a radius of Rpl = 1.27 ± 0.04 RJ, resulting in a mean density of 0.14 ± 0.02 ρJ. The stellar parameters are mass M= 0.93 ± 0.03 M, radius R= 0.895 ± 0.23 R, and age 9+3-4Gyr. 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+33-32K. Both values strengthen the observed empirical correlation between these parameters and the planetary radius for the known transiting Saturn-mass planets.

KW - planetary systems

KW - stars: individual: WASP-39

KW - techniques: photometric

KW - techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=79958138010&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201116671

DO - 10.1051/0004-6361/201116671

M3 - Article

AN - SCOPUS:79958138010

VL - 531

SP - 1

EP - 8

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A40

ER -

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

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Keywords

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