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

Anderson, D. R.; Collier Cameron, A.; Delrez, Laetitia; Doyle, A. P.; Gillon, Michaël; Hellier, C.; Jehin, Emmanuel; Lendl, M.; Maxted, P. F. L.; Madhusudhan, N.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A. M. S.; Triaud, A. H. M. J.; Turner, O. D.; Udry, S.; West, R. G.

doi:10.1051/0004-6361/201730439

Article (Scientific journals)

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

Anderson, D. R.; Collier Cameron, A.; Delrez, Laetitia et al.

2017 • In Astronomy and Astrophysics, 604

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/217477

DOI
10.1051/0004-6361/201730439

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Keywords :

planets and satellites: formation; planets and satellites: individual: WASP-91b; planetary systems; planets and satellites: individual: WASP-105b; planets and satellites: individual: WASP-107b

Abstract :

[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>

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Anderson, D. R.; 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, Laetitia ; 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 ; 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 ; 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

More authors (10 more)

Language :

English

Title :

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

Publication date :

01 August 2017

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

604

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2017A%26A...604A.110A

Available on ORBi :

since 28 December 2017

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