Reference : The discoveries of WASP-91b, WASP-105b and WASP-107b: Two warm Jupiters and a planet ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/217477
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
English
Anderson, D. R. mailto [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
Collier Cameron, A. [SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK]
Delrez, L. [Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bât. B5C, Liège 1, Belgium; Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK]
Doyle, A. P. [Department of Physics, University of Warwick, Coventry, CV4 7AL, UK]
Gillon, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Hellier, C. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Lendl, M. [Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bât. B5C, Liège 1, Belgium; Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland]
Maxted, P. F. L. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
Madhusudhan, N. [Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK]
Pepe, F. [Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland]
Pollacco, D. [Department of Physics, University of Warwick, Coventry, CV4 7AL, UK]
Queloz, D. [Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK]
Ségransan, D. [Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland]
Smalley, B. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
Smith, A. M. S. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK; N. Copernicus Astronomical Centre, Polish Academy of Sciences, Bartycka 18, 00-716, Warsaw, Poland; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany]
Triaud, A. H. M. J. [Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland; Centre for Planetary Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, ON, M1C 1A4, Canada; Department of Astronomy & Astrophysics, University of Toronto, Toronto, ON, M5S 3H4, Canada; Institute of Astronomy, Madingley Road, CB3 0HA, UK]
Turner, O. D. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
Udry, S. [Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland]
West, R. G. [Department of Physics, University of Warwick, Coventry, CV4 7AL, UK)]
1-Aug-2017
Astronomy and Astrophysics
EDP Sciences
604
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] planets and satellites: formation ; planets and satellites: individual: WASP-91b ; planetary systems ; planets and satellites: individual: WASP-105b ; planets and satellites: individual: WASP-107b
[en] We report the discoveries of three transiting exoplanets. WASP-91b is a warm Jupiter (1.34 M[SUB]Jup[/SUB], 1.03 R[SUB]Jup[/SUB]) in a 2.8-day orbit around a metal-rich K3 star. WASP-105b is a warm Jupiter (1.8 M[SUB]Jup[/SUB], 0.96 R[SUB]Jup[/SUB]) in a 7.9-day orbit around a metal-rich K2 star. WASP-107b is a warm super-Neptune/sub-Saturn (0.12 M[SUB]Jup[/SUB], 0.94 R[SUB]Jup[/SUB]) 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 M[SUB]Nep[/SUB], 0.40 M[SUB]Sat[/SUB]) places it in the transition region between the ice giants and gas giants of the Solar System. Its radius of 0.94 R[SUB]Jup[/SUB] 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 M[SUB]Nep[/SUB] 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. Based on observations made with: the WASP-South photometric survey instrument, the 0.6-m TRAPPIST robotic imager, and the EulerCam camera and the CORALIE spectrograph mounted on the 1.2-m Euler-Swiss telescope.The photometric time-series and radial-velocity data used in this work are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/A110">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/A110</A>
http://hdl.handle.net/2268/217477
10.1051/0004-6361/201730439
http://adsabs.harvard.edu/abs/2017A%26A...604A.110A

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