TY - JOUR
T1 - The discoveries of WASP-91b, WASP-105b and WASP-107b
T2 - Two warm Jupiters and a planet in the transition region between ice giants and gas giants
AU - Anderson, D.~R.
AU - Collier Cameron, A.
AU - Delrez, L.
AU - Doyle, A.~P.
AU - Gillon, Michael
AU - Hellier, C.
AU - Jehin, E.
AU - Lendl, M.
AU - Maxted, P.~F.~L.
AU - Madhusudhan, N.
AU - Pepe, F.
AU - Pollacco, D.
AU - Queloz, Didier
AU - Ségransan, D.
AU - Smalley, B.
AU - Smith, A.~M.~S.
AU - Triaud, A.~H.~M.~J.
AU - Turner, O.~D.
AU - Udry, S.
AU - West, R.~G.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - We report the discoveries of three transiting exoplanets. WASP-91b is a warm Jupiter (1.34 M$_Jup$, 1.03 R$_Jup$) in a 2.8-day orbit around a metal-rich K3 star. WASP-105b is a warm Jupiter (1.8 M$_Jup$, 0.96 R$_Jup$) in a 7.9-day orbit around a metal-rich K2 star. WASP-107b is a warm super-Neptune/sub-Saturn (0.12 M$_Jup$, 0.94 R$_Jup$) 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$_Nep$, 0.40 M$_Sat$) places it in the transition region between the ice giants and gas giants of the Solar System. Its radius of 0.94 R$_Jup$ 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$_Nep$ 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 http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/A110
AB - We report the discoveries of three transiting exoplanets. WASP-91b is a warm Jupiter (1.34 M$_Jup$, 1.03 R$_Jup$) in a 2.8-day orbit around a metal-rich K3 star. WASP-105b is a warm Jupiter (1.8 M$_Jup$, 0.96 R$_Jup$) in a 7.9-day orbit around a metal-rich K2 star. WASP-107b is a warm super-Neptune/sub-Saturn (0.12 M$_Jup$, 0.94 R$_Jup$) 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$_Nep$, 0.40 M$_Sat$) places it in the transition region between the ice giants and gas giants of the Solar System. Its radius of 0.94 R$_Jup$ 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$_Nep$ 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 http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/A110
KW - planets and satellites: individual: WASP-107b
KW - planets and satellites: formation
KW - planets and satellites: individual: WASP-91b
KW - planetary systems
KW - planets and satellites: individual: WASP-105b
U2 - 10.1051/0004-6361/201730439
DO - 10.1051/0004-6361/201730439
M3 - Article
SN - 0004-6361
VL - 604
SP - A110
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
ER -