From dense hot Jupiter to low-density Neptune: the discovery of WASP-127b, WASP-136b, and WASP-138b

K. W. F. Lam; F. Faedi; D. J. A. Brown; D. R. Anderson; L. Delrez; M. Gillon; G. Hébrard; M. Lendl; L. Mancini; J. Southworth; B. Smalley; A. H. M. Triaud; O. D. Turner; K. L. Hay; D. J. Armstrong; S. C. C. Barros; A. S. Bonomo; F. Bouchy; P. Boumis; A. Collier Cameron; A. P. Doyle; C. Hellier; T. Henning; E. Jehin; G. King; J. Kirk; T. Louden; P. F. L. Maxted; J. J. McCormac; H. P. Osborn; E. Palle; F. Pepe; D. Pollacco; J. Prieto-Arranz; D. Queloz; J. Rey; D. Ségransan; S. Udry; S. Walker; R. G. West; P. J.  Wheatley

doi:10.1051/0004-6361/201629403

From dense hot Jupiter to low-density Neptune: the discovery of WASP-127b, WASP-136b, and WASP-138b

K. W. F. Lam
, F. Faedi
, D. J. A. Brown
, D. R. Anderson
, L. Delrez
, M. Gillon
, G. Hébrard
, M. Lendl
, L. Mancini
, J. Southworth
, B. Smalley
, A. H. M. Triaud
, O. D. Turner
, K. L. Hay
, D. J. Armstrong
, S. C. C. Barros
, A. S. Bonomo
, F. Bouchy
, P. Boumis
, A. Collier Cameron

A. P. Doyle, C. Hellier, T. Henning, E. Jehin, G. King, J. Kirk, T. Louden, P. F. L. Maxted, J. J. McCormac, H. P. Osborn, E. Palle, F. Pepe, D. Pollacco, J. Prieto-Arranz, D. Queloz, J. Rey, D. Ségransan, S. Udry, S. Walker, R. G. West, P. J. Wheatley

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

Abstract

We report three newly discovered exoplanets from the SuperWASP survey. WASP-127b is a heavily inflated super-Neptune of mass 0.18 ± 0.02 M_J and radius 1.37 ± 0.04 R_J. This is one of the least massive planets discovered by the WASP project. It orbits a bright host star (V_mag = 10.16) of spectral type G5 with a period of 4.17 days. WASP-127b is a low-density planet that has an extended atmosphere with a scale height of 2500 ± 400 km, making it an ideal candidate for transmission spectroscopy. WASP-136b and WASP-138b are both hot Jupiters with mass and radii of 1.51 ± 0.08 M_J and 1.38 ± 0.16 R_J, and 1.22 ± 0.08 M_J and 1.09 ± 0.05 R_J, respectively. WASP-136b is in a 5.22-day orbit around an F9 subgiant star with a mass of 1.41 ± 0.07 M_⊙ and a radius of 2.21 ± 0.22 R_⊙. The discovery of WASP-136b could help constrain the characteristics of the giant planet population around evolved stars. WASP-138b orbits an F7 star with a period of 3.63 days. Its radius agrees with theoretical values from standard models, suggesting the presence of a heavy element core with a mass of ∼ 10 M_⊕. The discovery of these new planets helps in exploring the diverse compositional range of short-period planets, and will aid our understanding of the physical characteristics of both gas giants and low-density planets.

Original language	English
Article number	A3
Number of pages	10
Journal	Astronomy & Astrophysics
Volume	599
Early online date	20 Feb 2017
DOIs	https://doi.org/10.1051/0004-6361/201629403
Publication status	Published - 1 Mar 2017

Keywords

Planetary systems
Stars: individual: WASP-127
Stars: individual: WASP-136
Stars: individual: WASP-138
Techniques: photometric
Techniques: radial velocities

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10.1051/0004-6361/201629403

Cameron_2016_A&A_Low-densityNeptune_AAM
© ESO, 2017. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1051/0004-6361/201629403
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https://arxiv.org/abs/1607.07859

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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. (PI), Cameron, A. (CoI), Cyganowski, C. (CoI), Horne, K. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard
PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence
Cameron, A. (PI), Driver, S. (CoI), Greaves, J. (CoI) & Horne, K. (CoI)
Science & Technology Facilities Council
1/10/10 → 30/09/13
Project: Standard
PATT Linked Travel ST/G001006/1: Patt Linked Travel & Subsistence
Cameron, A. (PI), Driver, S. (CoI), Greaves, J. (CoI) & Horne, K. (CoI)
Science & Technology Facilities Council
1/10/08 → 30/09/10
Project: Standard

Cite this

Lam, K. W. F., Faedi, F., Brown, D. J. A., Anderson, D. R., Delrez, L., Gillon, M., Hébrard, G., Lendl, M., Mancini, L., Southworth, J., Smalley, B., Triaud, A. H. M., Turner, O. D., Hay, K. L., Armstrong, D. J., Barros, S. C. C., Bonomo, A. S., Bouchy, F., Boumis, P., ... Wheatley, P. J. (2017). From dense hot Jupiter to low-density Neptune: the discovery of WASP-127b, WASP-136b, and WASP-138b. Astronomy & Astrophysics, 599, Article A3. https://doi.org/10.1051/0004-6361/201629403

@article{5fc761b761794f87b0f33476ec528222,

title = "From dense hot Jupiter to low-density Neptune: the discovery of WASP-127b, WASP-136b, and WASP-138b",

abstract = "We report three newly discovered exoplanets from the SuperWASP survey. WASP-127b is a heavily inflated super-Neptune of mass 0.18 ± 0.02 MJ and radius 1.37 ± 0.04 RJ. This is one of the least massive planets discovered by the WASP project. It orbits a bright host star (Vmag = 10.16) of spectral type G5 with a period of 4.17 days. WASP-127b is a low-density planet that has an extended atmosphere with a scale height of 2500 ± 400 km, making it an ideal candidate for transmission spectroscopy. WASP-136b and WASP-138b are both hot Jupiters with mass and radii of 1.51 ± 0.08 MJ and 1.38 ± 0.16 RJ, and 1.22 ± 0.08 MJ and 1.09 ± 0.05 RJ, respectively. WASP-136b is in a 5.22-day orbit around an F9 subgiant star with a mass of 1.41 ± 0.07 M⊙ and a radius of 2.21 ± 0.22 R⊙. The discovery of WASP-136b could help constrain the characteristics of the giant planet population around evolved stars. WASP-138b orbits an F7 star with a period of 3.63 days. Its radius agrees with theoretical values from standard models, suggesting the presence of a heavy element core with a mass of ∼ 10 M⊕. The discovery of these new planets helps in exploring the diverse compositional range of short-period planets, and will aid our understanding of the physical characteristics of both gas giants and low-density planets.",

keywords = "Planetary systems, Stars: individual: WASP-127, Stars: individual: WASP-136, Stars: individual: WASP-138, Techniques: photometric, Techniques: radial velocities",

author = "Lam, \{K. W. F.\} and F. Faedi and Brown, \{D. J. A.\} and Anderson, \{D. R.\} and L. Delrez and M. Gillon and G. H{\'e}brard and M. Lendl and L. Mancini and J. Southworth and B. Smalley and Triaud, \{A. H. M.\} and Turner, \{O. D.\} and Hay, \{K. L.\} and Armstrong, \{D. J.\} and Barros, \{S. C. C.\} and Bonomo, \{A. S.\} and F. Bouchy and P. Boumis and \{Collier Cameron\}, A. and Doyle, \{A. P.\} and C. Hellier and T. Henning and E. Jehin and G. King and J. Kirk and T. Louden and Maxted, \{P. F. L.\} and McCormac, \{J. J.\} and Osborn, \{H. P.\} and E. Palle and F. Pepe and D. Pollacco and J. Prieto-Arranz and D. Queloz and J. Rey and D. S{\'e}gransan and S. Udry and S. Walker and West, \{R. G.\} and Wheatley, \{P. J.\}",

year = "2017",

month = mar,

day = "1",

doi = "10.1051/0004-6361/201629403",

language = "English",

volume = "599",

journal = "Astronomy \& Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Lam, KWF, Faedi, F, Brown, DJA, Anderson, DR, Delrez, L, Gillon, M, Hébrard, G, Lendl, M, Mancini, L, Southworth, J, Smalley, B, Triaud, AHM, Turner, OD, Hay, KL, Armstrong, DJ, Barros, SCC, Bonomo, AS, Bouchy, F, Boumis, P, Collier Cameron, A, Doyle, AP, Hellier, C, Henning, T, Jehin, E, King, G, Kirk, J, Louden, T, Maxted, PFL, McCormac, JJ, Osborn, HP, Palle, E, Pepe, F, Pollacco, D, Prieto-Arranz, J, Queloz, D, Rey, J, Ségransan, D, Udry, S, Walker, S, West, RG & Wheatley, PJ 2017, 'From dense hot Jupiter to low-density Neptune: the discovery of WASP-127b, WASP-136b, and WASP-138b', Astronomy & Astrophysics, vol. 599, A3. https://doi.org/10.1051/0004-6361/201629403

TY - JOUR

T1 - From dense hot Jupiter to low-density Neptune

T2 - the discovery of WASP-127b, WASP-136b, and WASP-138b

AU - Lam, K. W. F.

AU - Faedi, F.

AU - Brown, D. J. A.

AU - Anderson, D. R.

AU - Delrez, L.

AU - Gillon, M.

AU - Hébrard, G.

AU - Lendl, M.

AU - Mancini, L.

AU - Southworth, J.

AU - Smalley, B.

AU - Triaud, A. H. M.

AU - Turner, O. D.

AU - Hay, K. L.

AU - Armstrong, D. J.

AU - Barros, S. C. C.

AU - Bonomo, A. S.

AU - Bouchy, F.

AU - Boumis, P.

AU - Collier Cameron, A.

AU - Doyle, A. P.

AU - Hellier, C.

AU - Henning, T.

AU - Jehin, E.

AU - King, G.

AU - Kirk, J.

AU - Louden, T.

AU - Maxted, P. F. L.

AU - McCormac, J. J.

AU - Osborn, H. P.

AU - Palle, E.

AU - Pepe, F.

AU - Pollacco, D.

AU - Prieto-Arranz, J.

AU - Queloz, D.

AU - Rey, J.

AU - Ségransan, D.

AU - Udry, S.

AU - Walker, S.

AU - West, R. G.

AU - Wheatley, P. J.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - We report three newly discovered exoplanets from the SuperWASP survey. WASP-127b is a heavily inflated super-Neptune of mass 0.18 ± 0.02 MJ and radius 1.37 ± 0.04 RJ. This is one of the least massive planets discovered by the WASP project. It orbits a bright host star (Vmag = 10.16) of spectral type G5 with a period of 4.17 days. WASP-127b is a low-density planet that has an extended atmosphere with a scale height of 2500 ± 400 km, making it an ideal candidate for transmission spectroscopy. WASP-136b and WASP-138b are both hot Jupiters with mass and radii of 1.51 ± 0.08 MJ and 1.38 ± 0.16 RJ, and 1.22 ± 0.08 MJ and 1.09 ± 0.05 RJ, respectively. WASP-136b is in a 5.22-day orbit around an F9 subgiant star with a mass of 1.41 ± 0.07 M⊙ and a radius of 2.21 ± 0.22 R⊙. The discovery of WASP-136b could help constrain the characteristics of the giant planet population around evolved stars. WASP-138b orbits an F7 star with a period of 3.63 days. Its radius agrees with theoretical values from standard models, suggesting the presence of a heavy element core with a mass of ∼ 10 M⊕. The discovery of these new planets helps in exploring the diverse compositional range of short-period planets, and will aid our understanding of the physical characteristics of both gas giants and low-density planets.

AB - We report three newly discovered exoplanets from the SuperWASP survey. WASP-127b is a heavily inflated super-Neptune of mass 0.18 ± 0.02 MJ and radius 1.37 ± 0.04 RJ. This is one of the least massive planets discovered by the WASP project. It orbits a bright host star (Vmag = 10.16) of spectral type G5 with a period of 4.17 days. WASP-127b is a low-density planet that has an extended atmosphere with a scale height of 2500 ± 400 km, making it an ideal candidate for transmission spectroscopy. WASP-136b and WASP-138b are both hot Jupiters with mass and radii of 1.51 ± 0.08 MJ and 1.38 ± 0.16 RJ, and 1.22 ± 0.08 MJ and 1.09 ± 0.05 RJ, respectively. WASP-136b is in a 5.22-day orbit around an F9 subgiant star with a mass of 1.41 ± 0.07 M⊙ and a radius of 2.21 ± 0.22 R⊙. The discovery of WASP-136b could help constrain the characteristics of the giant planet population around evolved stars. WASP-138b orbits an F7 star with a period of 3.63 days. Its radius agrees with theoretical values from standard models, suggesting the presence of a heavy element core with a mass of ∼ 10 M⊕. The discovery of these new planets helps in exploring the diverse compositional range of short-period planets, and will aid our understanding of the physical characteristics of both gas giants and low-density planets.

KW - Planetary systems

KW - Stars: individual: WASP-127

KW - Stars: individual: WASP-136

KW - Stars: individual: WASP-138

KW - Techniques: photometric

KW - Techniques: radial velocities

U2 - 10.1051/0004-6361/201629403

DO - 10.1051/0004-6361/201629403

M3 - Article

AN - SCOPUS:85013466570

SN - 0004-6361

VL - 599

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A3

ER -

From dense hot Jupiter to low-density Neptune: the discovery of WASP-127b, WASP-136b, and WASP-138b

Abstract

Keywords

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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence

PATT Linked Travel ST/G001006/1: Patt Linked Travel & Subsistence

Cite this