Astronomy and Astrophysics, volume 610A, 63-63 (2018/2-1)
The discovery of WASP-151b, WASP-153b, WASP-156b: Insights on giant planet migration and the upper boundary of the Neptunian desert.
DEMANGEON O.D.S., FAEDI F., HEBRARD G., BROWN D.J.A., BARROS S.C.C., DOYLE A.P., MAXTED P.F.L., CAMERON A.C., HAY K.L., ALIKAKOS J., ANDERSON D.R., ARMSTRONG D.J., BOUMIS P., BONOMO A.S., BOUCHY F., DELREZ L., GILLON M., HASWELL C.A., HELLIER C., JEHIN E., KIEFER F., LAM K.W.F., LENDL M., MANCINI L., McCORMAC J., NORTON A.J., OSBORN H.P., PALLE E., PEPE F., POLLACCO D.L., PRIETO-ARRANZ J., QUELOZ D., SEGRANSAN D., SMALLEY B., TRIAUD A.H.M.J., UDRY S., WEST R. and WHEATLEY P.J.
Abstract (from CDS):
To investigate the origin of the features discovered in the exoplanet population, the knowledge of exoplanets' mass and radius with a good precision (≤10%) is essential. To achieve this purpose the discovery of transiting exoplanets around bright stars is of prime interest. In this paper, we report the discovery of three transiting exoplanets by the SuperWASP survey and the SOPHIE spectrograph with mass and radius determined with a precision better than 15%. WASP-151b and WASP-153b are two hot Saturns with masses, radii, densities and equilibrium temperatures of 0.31–0.03+0.04MJ, 1.13–0.03+0.03RJ, 0.22–0.02+0.03ρJ and 1290–10+20K, and 0.39–0.02+0.02MJ, 1.55–0.08+0.10RJ, 0.11–0.02+0.02ρJ and 1700–40+40K, respectively. Their host stars are early G type stars (with mag V∼13) and their orbital periods are 4.53 and 3.33 days, respectively. WASP-156b is a super-Neptune orbiting a K type star (mag V=11.6). It has a mass of 0.128–0.009+0.010MJ, a radius of 0.51–0.02+0.02RJ, a density of 1.0–0.1+0.1ρJ, an equilibrium temperature of 970–20+30K and an orbital period of 3.83 days. The radius of WASP-151b appears to be only slightly inflated, while WASP-153b presents a significant radius anomaly compared to a recently published model. WASP-156b, being one of the few well characterized super-Neptunes, will help to constrain the still debated formation of Neptune size planets and the transition between gas and ice giants. The estimates of the age of these three stars confirms an already observed tendency for some stars to have gyrochronological ages significantly lower than their isochronal ages. We propose that high eccentricity migration could partially explain this behavior for stars hosting a short period planet. Finally, these three planets also lie close to (WASP-151b and WASP-153b) or below (WASP-156b) the upper boundary of the Neptunian desert. Their characteristics support that the ultra-violet irradiation plays an important role in this depletion of planets observed in the exoplanet population.
© ESO 2018
planets and satellites: detection - techniques: radial velocities - techniques: photometric - stars: individual: WASP-151 - stars: individual: WASP-153 - stars: individual: WASP-156
VizieR on-line data:
<Available at CDS (J/A+A/610/A63): objects.dat rvw151.dat rvw153.dat rvw156.dat lcw151e.dat lcw151e1.dat lcw151i.dat lcw151i1.dat lcw151k.dat lcw151t.dat lcw151w.dat lcw153l.dat lcw153r.dat lcw153w.dat lcw156e.dat lcw156e1.dat lcw156n.dat lcw156w.dat>
Status at CDS
Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.
View the references in ADS
To bookmark this query, right click on this link: simbad:2018A&A...610A..63D and select 'bookmark this link' or equivalent in the popup menu