WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars

D. R. Anderson; A. Collier Cameron; C. Hellier; M. Lendl; T. A. Lister; P. F. L. Maxted; D. Queloz; B. Smalley; A. M. S. Smith; A. H. M. J. Triaud; D. J. A. Brown; M. Gillon; M. Neveu-VanMalle; F. Pepe; D. Pollacco; D. Ségransan; S. Udry; R. G. West; P. J. Wheatley

doi:10.1051/0004-6361/201423591

WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars

D. R. Anderson
, A. Collier Cameron
, C. Hellier
, M. Lendl
, T. A. Lister
, P. F. L. Maxted
, D. Queloz
, B. Smalley
, A. M. S. Smith
, A. H. M. J. Triaud
, D. J. A. Brown
, M. Gillon
, M. Neveu-VanMalle
, F. Pepe
, D. Pollacco
, D. Ségransan
, S. Udry
, R. G. West
, P. J. Wheatley

Physics and Astronomy

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

23 Citations (Scopus)

Abstract

We report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31 M_Jup; 1.46 R_Jup) in a 4.9-day, near-aligned (λ = 12.7±4.2°) orbit around CD-24 102 (V = 10.7; F9). Due to the low density of the planet and the apparent brightness of the host star, WASP-20 is a good target for atmospheric characterisation via transmission spectroscopy. WASP-28b is an inflated, Jupiter-mass planet (0.91 M_Jup; 1.21 R_Jup) in a 3.4-day, near-aligned (λ = 8±18°) orbit around a V = 12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars (7⁺²_-1 Gyr and 6000±100 K for WASP-20; 5⁺³_-2 Gyr and 6100±150 K for WASP-28), their orbital alignment is consistent with the hypothesis that close-in giant planets are scattered into eccentric orbits with random alignments, which are then circularised and aligned with their stars' spins via tidal dissipation.

Original language	English
Article number	A61
Number of pages	8
Journal	Astronomy and Astrophysics
Volume	575
Early online date	24 Feb 2015
DOIs	https://doi.org/10.1051/0004-6361/201423591
Publication status	Published - Mar 2015

Keywords

planetary systems
stars: individual: WASP-20b
stars: individual: WASP-28b

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Anderson, D. R., Collier Cameron, A., Hellier, C., Lendl, M., Lister, T. A., Maxted, P. F. L., Queloz, D., Smalley, B., Smith, A. M. S., Triaud, A. H. M. J., Brown, D. J. A., Gillon, M., Neveu-VanMalle, M., Pepe, F., Pollacco, D., Ségransan, D., Udry, S., West, R. G., & Wheatley, P. J. (2015). WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars. Astronomy and Astrophysics, 575, Article A61. https://doi.org/10.1051/0004-6361/201423591

@article{a7052823612443dbb6e6c8a8032f5a65,

title = "WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars",

abstract = "We report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31 MJup; 1.46 RJup) in a 4.9-day, near-aligned (λ = 12.7±4.2°) orbit around CD-24 102 (V = 10.7; F9). Due to the low density of the planet and the apparent brightness of the host star, WASP-20 is a good target for atmospheric characterisation via transmission spectroscopy. WASP-28b is an inflated, Jupiter-mass planet (0.91 MJup; 1.21 RJup) in a 3.4-day, near-aligned (λ = 8±18°) orbit around a V = 12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars (7+2-1 Gyr and 6000±100 K for WASP-20; 5+3-2 Gyr and 6100±150 K for WASP-28), their orbital alignment is consistent with the hypothesis that close-in giant planets are scattered into eccentric orbits with random alignments, which are then circularised and aligned with their stars' spins via tidal dissipation. ",

keywords = "planetary systems, stars: individual: WASP-20b, stars: individual: WASP-28b",

author = "Anderson, \{D. R.\} and \{Collier Cameron\}, A. and C. Hellier and M. Lendl and Lister, \{T. A.\} and Maxted, \{P. F. L.\} and D. Queloz and B. Smalley and Smith, \{A. M. S.\} and Triaud, \{A. H. M. J.\} and Brown, \{D. J. A.\} and M. Gillon and M. Neveu-VanMalle and F. Pepe and D. Pollacco and D. S{\'e}gransan and S. Udry and West, \{R. G.\} and Wheatley, \{P. J.\}",

year = "2015",

month = mar,

doi = "10.1051/0004-6361/201423591",

language = "English",

volume = "575",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Anderson, DR, Collier Cameron, A, Hellier, C, Lendl, M, Lister, TA, Maxted, PFL, Queloz, D, Smalley, B, Smith, AMS, Triaud, AHMJ, Brown, DJA, Gillon, M, Neveu-VanMalle, M, Pepe, F, Pollacco, D, Ségransan, D, Udry, S, West, RG & Wheatley, PJ 2015, 'WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars', Astronomy and Astrophysics, vol. 575, A61. https://doi.org/10.1051/0004-6361/201423591

TY - JOUR

T1 - WASP-20b and WASP-28b

T2 - a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars

AU - Anderson, D. R.

AU - Collier Cameron, A.

AU - Hellier, C.

AU - Lendl, M.

AU - Lister, T. A.

AU - Maxted, P. F. L.

AU - Queloz, D.

AU - Smalley, B.

AU - Smith, A. M. S.

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

AU - Brown, D. J. A.

AU - Gillon, M.

AU - Neveu-VanMalle, M.

AU - Pepe, F.

AU - Pollacco, D.

AU - Ségransan, D.

AU - Udry, S.

AU - West, R. G.

AU - Wheatley, P. J.

PY - 2015/3

Y1 - 2015/3

N2 - We report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31 MJup; 1.46 RJup) in a 4.9-day, near-aligned (λ = 12.7±4.2°) orbit around CD-24 102 (V = 10.7; F9). Due to the low density of the planet and the apparent brightness of the host star, WASP-20 is a good target for atmospheric characterisation via transmission spectroscopy. WASP-28b is an inflated, Jupiter-mass planet (0.91 MJup; 1.21 RJup) in a 3.4-day, near-aligned (λ = 8±18°) orbit around a V = 12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars (7+2-1 Gyr and 6000±100 K for WASP-20; 5+3-2 Gyr and 6100±150 K for WASP-28), their orbital alignment is consistent with the hypothesis that close-in giant planets are scattered into eccentric orbits with random alignments, which are then circularised and aligned with their stars' spins via tidal dissipation.

AB - We report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31 MJup; 1.46 RJup) in a 4.9-day, near-aligned (λ = 12.7±4.2°) orbit around CD-24 102 (V = 10.7; F9). Due to the low density of the planet and the apparent brightness of the host star, WASP-20 is a good target for atmospheric characterisation via transmission spectroscopy. WASP-28b is an inflated, Jupiter-mass planet (0.91 MJup; 1.21 RJup) in a 3.4-day, near-aligned (λ = 8±18°) orbit around a V = 12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars (7+2-1 Gyr and 6000±100 K for WASP-20; 5+3-2 Gyr and 6100±150 K for WASP-28), their orbital alignment is consistent with the hypothesis that close-in giant planets are scattered into eccentric orbits with random alignments, which are then circularised and aligned with their stars' spins via tidal dissipation.

KW - planetary systems

KW - stars: individual: WASP-20b

KW - stars: individual: WASP-28b

U2 - 10.1051/0004-6361/201423591

DO - 10.1051/0004-6361/201423591

M3 - Article

SN - 0004-6361

VL - 575

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A61

ER -

WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars

Abstract

Keywords

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