WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit

M. Lendl; A. H. M. J. Triaud; D. R. Anderson; A. Collier Cameron; L. Delrez; A. P. Doyle; M. Gillon; C. Hellier; E. Jehin; P. F. L. Maxted; M. Neveu-VanMalle; F. Pepe; D. Pollacco; D. Queloz; D. Ségransan; B. Smalley; A. M. S. Smith; S. Udry; V. Van Grootel; R. G. West

doi:10.1051/0004-6361/201424481

WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit

M. Lendl, A. H. M. J. Triaud, D. R. Anderson, A. Collier Cameron, L. Delrez, A. P. Doyle, M. Gillon, C. Hellier, E. Jehin, P. F. L. Maxted, M. Neveu-VanMalle, F. Pepe, D. Pollacco, D. Queloz, D. Ségransan, B. Smalley, A. M. S. Smith, S. Udry, V. Van Grootel, R. G. West

Physics and Astronomy

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

23 Citations (Scopus)

Abstract

We report the discovery of WASP-117b, the first planet with a period beyond 10 days found by the WASP survey. The planet has a mass of M_p = 0.2755 ± 0.0089 M_J, a radius of and is in an eccentric (e = 0.302 ± 0.023), 10.02165 ± 0.00055 d orbit around a main-sequence F9 star. The host star's brightness (V = 10.15 mag) makes WASP-117 a good target for follow-up observations, and with a periastron planetary equilibrium temperature of K and a low planetary mean density () it is one of the best targets for transmission spectroscopy among planets with periods around 10 days. From a measurement of the Rossiter-McLaughlin effect, we infer a projected angle between the planetary orbit and stellar spin axes of β = -44 ± 11 deg, and we further derive an orbital obliquity of deg. Owing to the large orbital separation, tidal forces causing orbital circularization and realignment of the planetary orbit with the stellar plane are weak, having had little impact on the planetary orbit over the system lifetime. WASP-117b joins a small sample of transiting giant planets with well characterized orbits at periods above ~8 days.

Original language	English
Article number	A81
Number of pages	6
Journal	Astronomy and Astrophysics
Volume	568
DOIs	https://doi.org/10.1051/0004-6361/201424481
Publication status	Published - 22 Aug 2014

Keywords

planetary systems
techniques: radial velocities
techniques: photometric

Access to Document

10.1051/0004-6361/201424481Licence: None: All rights reserved

https://doi.org/10.1051/0004-6361/201424481Licence: None: All rights reserved

Cite this

Lendl, M., Triaud, A. H. M. J., Anderson, D. R., Collier Cameron, A., Delrez, L., Doyle, A. P., Gillon, M., Hellier, C., Jehin, E., Maxted, P. F. L., Neveu-VanMalle, M., Pepe, F., Pollacco, D., Queloz, D., Ségransan, D., Smalley, B., Smith, A. M. S., Udry, S., Van Grootel, V., & West, R. G. (2014). WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit. Astronomy and Astrophysics, 568, Article A81. https://doi.org/10.1051/0004-6361/201424481

@article{eb5b0d5b38b546fab3cd27bfeafdf6f4,

title = "WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit",

abstract = "We report the discovery of WASP-117b, the first planet with a period beyond 10 days found by the WASP survey. The planet has a mass of Mp = 0.2755 ± 0.0089 MJ, a radius of and is in an eccentric (e = 0.302 ± 0.023), 10.02165 ± 0.00055 d orbit around a main-sequence F9 star. The host star's brightness (V = 10.15 mag) makes WASP-117 a good target for follow-up observations, and with a periastron planetary equilibrium temperature of K and a low planetary mean density () it is one of the best targets for transmission spectroscopy among planets with periods around 10 days. From a measurement of the Rossiter-McLaughlin effect, we infer a projected angle between the planetary orbit and stellar spin axes of β = -44 ± 11 deg, and we further derive an orbital obliquity of deg. Owing to the large orbital separation, tidal forces causing orbital circularization and realignment of the planetary orbit with the stellar plane are weak, having had little impact on the planetary orbit over the system lifetime. WASP-117b joins a small sample of transiting giant planets with well characterized orbits at periods above ~8 days. ",

keywords = "planetary systems, techniques: radial velocities, techniques: photometric",

author = "M. Lendl and Triaud, {A. H. M. J.} and Anderson, {D. R.} and {Collier Cameron}, A. and L. Delrez and Doyle, {A. P.} and M. Gillon and C. Hellier and E. Jehin and Maxted, {P. F. L.} and M. Neveu-VanMalle and F. Pepe and D. Pollacco and D. Queloz and D. S{\'e}gransan and B. Smalley and Smith, {A. M. S.} and S. Udry and {Van Grootel}, V. and West, {R. G.}",

year = "2014",

month = aug,

day = "22",

doi = "10.1051/0004-6361/201424481",

language = "English",

volume = "568",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Lendl, M, Triaud, AHMJ, Anderson, DR, Collier Cameron, A, Delrez, L, Doyle, AP, Gillon, M, Hellier, C, Jehin, E, Maxted, PFL, Neveu-VanMalle, M, Pepe, F, Pollacco, D, Queloz, D, Ségransan, D, Smalley, B, Smith, AMS, Udry, S, Van Grootel, V & West, RG 2014, 'WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit', Astronomy and Astrophysics, vol. 568, A81. https://doi.org/10.1051/0004-6361/201424481

TY - JOUR

T1 - WASP-117b

T2 - a 10-day-period Saturn in an eccentric and misaligned orbit

AU - Lendl, M.

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

AU - Anderson, D. R.

AU - Collier Cameron, A.

AU - Delrez, L.

AU - Doyle, A. P.

AU - Gillon, M.

AU - Hellier, C.

AU - Jehin, E.

AU - Maxted, P. F. L.

AU - Neveu-VanMalle, M.

AU - Pepe, F.

AU - Pollacco, D.

AU - Queloz, D.

AU - Ségransan, D.

AU - Smalley, B.

AU - Smith, A. M. S.

AU - Udry, S.

AU - Van Grootel, V.

AU - West, R. G.

PY - 2014/8/22

Y1 - 2014/8/22

N2 - We report the discovery of WASP-117b, the first planet with a period beyond 10 days found by the WASP survey. The planet has a mass of Mp = 0.2755 ± 0.0089 MJ, a radius of and is in an eccentric (e = 0.302 ± 0.023), 10.02165 ± 0.00055 d orbit around a main-sequence F9 star. The host star's brightness (V = 10.15 mag) makes WASP-117 a good target for follow-up observations, and with a periastron planetary equilibrium temperature of K and a low planetary mean density () it is one of the best targets for transmission spectroscopy among planets with periods around 10 days. From a measurement of the Rossiter-McLaughlin effect, we infer a projected angle between the planetary orbit and stellar spin axes of β = -44 ± 11 deg, and we further derive an orbital obliquity of deg. Owing to the large orbital separation, tidal forces causing orbital circularization and realignment of the planetary orbit with the stellar plane are weak, having had little impact on the planetary orbit over the system lifetime. WASP-117b joins a small sample of transiting giant planets with well characterized orbits at periods above ~8 days.

AB - We report the discovery of WASP-117b, the first planet with a period beyond 10 days found by the WASP survey. The planet has a mass of Mp = 0.2755 ± 0.0089 MJ, a radius of and is in an eccentric (e = 0.302 ± 0.023), 10.02165 ± 0.00055 d orbit around a main-sequence F9 star. The host star's brightness (V = 10.15 mag) makes WASP-117 a good target for follow-up observations, and with a periastron planetary equilibrium temperature of K and a low planetary mean density () it is one of the best targets for transmission spectroscopy among planets with periods around 10 days. From a measurement of the Rossiter-McLaughlin effect, we infer a projected angle between the planetary orbit and stellar spin axes of β = -44 ± 11 deg, and we further derive an orbital obliquity of deg. Owing to the large orbital separation, tidal forces causing orbital circularization and realignment of the planetary orbit with the stellar plane are weak, having had little impact on the planetary orbit over the system lifetime. WASP-117b joins a small sample of transiting giant planets with well characterized orbits at periods above ~8 days.

KW - planetary systems

KW - techniques: radial velocities

KW - techniques: photometric

U2 - 10.1051/0004-6361/201424481

DO - 10.1051/0004-6361/201424481

M3 - Article

SN - 0004-6361

VL - 568

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A81

ER -

WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit

Abstract

Keywords

Access to Document

Fingerprint

Cite this