The discoveries of WASP-91b, WASP-105b and WASP-107b: Two warm Jupiters and a planet in the transition region between ice giants and gas giants

被引：49

作者：

Anderson D.R. ^{[1
]}

Collier Cameron A. ^{[2
]}

Delrez L. ^{[3
,4
]}

Doyle A.P. ^{[5
]}

Gillon M. ^{[3
]}

Hellier C. ^{[1
]}

Jehin E. ^{[3
]}

Lendl M. ^{[3
,6
]}

Maxted P.F.L. ^{[1
]}

Madhusudhan N. ^{[4
]}

Pepe F. ^{[6
]}

Pollacco D. ^{[5
]}

Queloz D. ^{[4
]}

Ségransan D. ^{[6
]}

Smalley B. ^{[1
]}

Smith A.M.S. ^{[1
,7
,8
]}

Triaud A.H.M.J. ^{[6
,9
,10
]}

Turner O.D. ^{[1
]}

Udry S. ^{[6
]}

West R.G. ^{[5
]}

机构：

[1] Astrophysics Group, Keele University, Staffordshire

[2] SUPA, School of Physics and Astronomy, University of St. Andrews, North-Haugh-Fife

[3] Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bât. B5C

[4] Cavendish Laboratory, J J Thomson Avenue, Cambridge

[5] Department of Physics, University of Warwick, Coventry

[6] Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, Sauverny

[7] N. Copernicus Astronomical Centre, Polish Academy of Sciences, Bartycka 18, Warsaw

[8] Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, Berlin

[9] Centre for Planetary Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, M1C 1A4, ON

[10] Astrophysics, University of Toronto, Toronto, M5S 3H4, ON

[11] Institute of Astronomy, Madingley Road

来源：

Astronomy and Astrophysics | 2017年 / 604卷

基金：

英国科学技术设施理事会;

关键词：

Planetary systems; Planets and satellites: formation; Planets and satellites: individual: WASP-105b; Planets and satellites: individual: WASP-107b; Planets and satellites: individual: WASP-91b;

D O I：

10.1051/0004-6361/201730439

中图分类号：

学科分类号：

摘要：

We report the discoveries of three transiting exoplanets. WASP-91b is a warm Jupiter (1.34 MJup, 1.03 RJup) in a 2.8-day orbit around a metal-rich K3 star. WASP-105b is a warm Jupiter (1.8 MJup, 0.96 RJup) in a 7.9-day orbit around a metal-rich K2 star. WASP-107b is a warm super-Neptune/sub-Saturn (0.12 MJup, 0.94 RJup) in a 5.7-day orbit around a solar-metallicity K6 star. Considering that giant planets seem to be more common around stars of higher metallicity and stars of higher mass, it is notable that the hosts are all metal-rich, late-type stars. With orbital separations that place both WASP-105b and WASP-107b in the weak-tide regime, measurements of the alignment between the planets' orbital axes and their stars' spin axes may help us to understand the inward migration of short-period, giant planets. The mass of WASP-107b (2.2 MNep, 0.40 MSat) places it in the transition region between the ice giants and gas giants of the Solar System. Its radius of 0.94 RJup suggests that it is a low-mass gas giant with a H/He-dominated composition. The planet thus sets a lower limit of 2.2 MNep on the planetary mass above which large gaseous envelopes can be accreted and retained by proto-planets on their way to becoming gas giants. We may discover whether WASP-107b more closely resembles an ice giant or a gas giant by measuring its atmospheric metallicity via transmission spectroscopy, for which WASP-107b is a very good target. © ESO, 2017.

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