Discovery and characterization of the exoplanets WASP-148b and c. A transiting system with two interacting giant planets. (arXiv:2004.14645v1 [astro-ph.EP])

Discovery and characterization of the exoplanets WASP-148b and c. A transiting system with two interacting giant planets. (arXiv:2004.14645v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Hebrard_G/0/1/0/all/0/1">G. Hebrard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Diaz_R/0/1/0/all/0/1">R.F. Diaz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Correia_A/0/1/0/all/0/1">A.C.M. Correia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cameron_A/0/1/0/all/0/1">A. Collier Cameron</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Laskar_J/0/1/0/all/0/1">J. Laskar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pollacco_D/0/1/0/all/0/1">D. Pollacco</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Almenara_J/0/1/0/all/0/1">J.-M. Almenara</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Anderson_D/0/1/0/all/0/1">D.R. Anderson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barros_S/0/1/0/all/0/1">S.C.C. Barros</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boisse_I/0/1/0/all/0/1">I. Boisse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bonomo_A/0/1/0/all/0/1">A.S. Bonomo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bouchy_F/0/1/0/all/0/1">F. Bouchy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boue_G/0/1/0/all/0/1">G. Boue</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boumis_P/0/1/0/all/0/1">P. Boumis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brown_D/0/1/0/all/0/1">D.J.A. Brown</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dalal_S/0/1/0/all/0/1">S. Dalal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Deleuil_M/0/1/0/all/0/1">M. Deleuil</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Demangeon_O/0/1/0/all/0/1">O. Demangeon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Doyle_A/0/1/0/all/0/1">A.P. Doyle</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Haswell_C/0/1/0/all/0/1">C.A. Haswell</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hellier_C/0/1/0/all/0/1">C. Hellier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Osborn_H/0/1/0/all/0/1">H. Osborn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kiefer_F/0/1/0/all/0/1">F. Kiefer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kolb_U/0/1/0/all/0/1">U.C. Kolb</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lam_K/0/1/0/all/0/1">K. Lam</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Etangs_A/0/1/0/all/0/1">A. Lecavelier des Etangs</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lopez_T/0/1/0/all/0/1">T. Lopez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martin_Lagarde_M/0/1/0/all/0/1">M. Martin-Lagarde</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Maxted_P/0/1/0/all/0/1">P. Maxted</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McCormac_J/0/1/0/all/0/1">J. McCormac</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nielsen_L/0/1/0/all/0/1">L.D. Nielsen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Palle_E/0/1/0/all/0/1">E. Palle</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Prieto_Arranz_J/0/1/0/all/0/1">J. Prieto-Arranz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Queloz_D/0/1/0/all/0/1">D. Queloz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Santerne_A/0/1/0/all/0/1">A. Santerne</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Smalley_B/0/1/0/all/0/1">B. Smalley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Turner_O/0/1/0/all/0/1">O. Turner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Udry_S/0/1/0/all/0/1">S. Udry</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Verilhac_D/0/1/0/all/0/1">D. Verilhac</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+West_R/0/1/0/all/0/1">R. West</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wheatley_P/0/1/0/all/0/1">P.J. Wheatley</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wilson_P/0/1/0/all/0/1">P.A. Wilson</a>

We present the discovery and characterization of WASP-148, a new extrasolar
system including at least two giant planets. The host star is a slowly
rotating, inactive late-G dwarf with a V=12 magnitude. The planet WASP-148b is
a hot Jupiter of 0.72 RJup and 0.29 MJup transiting its host with an orbital
period of 8.80 days. We found the planetary candidate with the SuperWASP
photometric survey then characterized it with the SOPHIE spectrograph. Our
radial velocity measurements subsequently revealed the presence of a second
planet in the system, WASP-148c, with an orbital period of 34.5 days and a
minimum mass of 0.40 MJup. No transits of that outer planet were detected. The
orbits of both planets are eccentric and fall near the 4:1 mean-motion
resonances. That configuration is stable on long time scales but induces
dynamical interactions so the orbits slightly differ from purely Keplerian
orbits. In particular, WASP-148b shows transit timing variations of typically
15 minutes making it one of the few cases with TTVs detected on ground-based
light curves. We establish the orbital plane of both planets could not have a
mutual inclination larger than 35 degrees, and the true mass of WASP-148c is
below 0.60 MJup. We present photometric and spectroscopic observations of that
system covering a time span of ten years, and their Keplerian and Newtonian
analyses; they should be significantly improved thanks to future TESS
observations.

http://arxiv.org/icons/sfx.gif