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

School of Physics and Astronomy

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

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 (0.31M; 1.46R) 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 (0.91M; 1.21R) 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 Gyr and 6000 ± 100 K for WASP-20; 5 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	A64
Number of pages	8
Journal	Astronomy & 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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10.1051/0004-6361/201423591

Cameron_2015_A&A_Wasp
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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard
Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014
Horne, K. D. (PI)
Science & Technology Facilities Council
1/10/11 → 31/03/12
Project: Standard
PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence
Cameron, A. C. (PI), Driver, S. P. (CoI), Greaves, J. S. (CoI) & Horne, K. D. (CoI)
Science & Technology Facilities Council
1/10/10 → 30/09/13
Project: Standard

WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars (dataset)
Anderson, D. R. (Creator), Cameron, A. C. (Creator), Hellier, C. (Creator), Lendl, M. (Creator), Lister, T. A. (Creator), Maxted, P. F. L. (Creator), Queloz, D. (Creator), Smalley, B. (Creator), Smith, A. M. S. (Creator), Triaud, A. H. M. J. (Creator), Brown, D. J. A. (Creator), Gillon, M. (Creator), Neveu-Vanmalle, M. (Creator), Pepe, F. (Creator), Pollacco, D. (Creator), Ségransan, D. (Creator), Udry, S. (Creator), West, R. G. (Creator) & Wheatley, P. J. (Creator), Strasbourg astronomical Data Center, 17 Feb 2015
http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/575/A61
Dataset

Cite this

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 & Astrophysics, 575, Article A64. https://doi.org/10.1051/0004-6361/201423591

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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 (0.31M; 1.46R) 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 (0.91M; 1.21R) 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 Gyr and 6000 ± 100 K for WASP-20; 5 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 = "D.R. Anderson and {Collier Cameron}, A. and C. Hellier and M. Lendl and T.A. Lister and P.F.L. Maxted and D. Queloz and B. Smalley and A.M.S. Smith and A.H.M.J. Triaud and D.J.A. Brown and M. Gillon and M. Neveu-Vanmalle and F. Pepe and D. Pollacco and D. S{\'e}gransan and S. Udry and R.G. West and P.J. Wheatley",

note = "Funding for WASP comes from consortium universities and from the UK{\textquoteright}s Science and Technology Facilities Council. M. Gillon is a FNRS Research Associate. A. H. M. J. Triaud is a Swiss National Science Foundation fellow under grant number PBGEP2-145594. ",

year = "2015",

month = mar,

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

language = "English",

volume = "575",

journal = "Astronomy & Astrophysics",

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publisher = "EDP SCIENCES S A",

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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 & Astrophysics, vol. 575, A64. 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.

N1 - Funding for WASP comes from consortium universities and from the UK’s Science and Technology Facilities Council. M. Gillon is a FNRS Research Associate. A. H. M. J. Triaud is a Swiss National Science Foundation fellow under grant number PBGEP2-145594.

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 (0.31M; 1.46R) 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 (0.91M; 1.21R) 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 Gyr and 6000 ± 100 K for WASP-20; 5 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 (0.31M; 1.46R) 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 (0.91M; 1.21R) 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 Gyr and 6000 ± 100 K for WASP-20; 5 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

AN - SCOPUS:84923375229

SN - 0004-6361

VL - 575

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A64

ER -

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

Abstract

Keywords

Access to Document

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Projects

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

Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014

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

Datasets

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

Cite this