MASCARA-3b. A hot Jupiter transiting a bright F7 star in an aligned orbit

M. Hjorth , S. Albrecht , G. J. J. Talens , F. Grundahl , A. B. Justesen , G. P. P. L. Otten (1) , V. Antoci , P. Dorval , E. Foxell , M. Fredslund Andersen , F. Murgas , E. Palle , R. Stuik , I. A. G. Snellen , V. van Eylen

1 LAM - Laboratoire d'Astrophysique de Marseille

We report the discovery of MASCARA-3b, a hot Jupiter orbiting its bright (V = 8.33) late F-type host every 5.55149 ± 0.00001 days in an almost circular orbit (e = 0.050_-0.017^+0.020). This is the fourth exoplanet discovered with the Multi-site All-Sky CAmeRA (MASCARA), and the first of these that orbits a late-type star. Follow-up spectroscopic measurements were obtained in and out of transit with the Hertzsprung SONG telescope. Combining the MASCARA photometry and SONG radial velocities reveals a radius and mass of 1.36 ± 0.05 R_Jup and 4.2 ± 0.2 M_Jup. In addition, SONG spectroscopic transit observations were obtained on two separate nights. From analyzing the mean out-of-transit broadening function, we obtain v sin i_⋆ = 20.4 ± 0.4 km s^-1. In addition, investigating the Rossiter-McLaughlin effect, as observed in the distortion of the stellar lines directly and through velocity anomalies, we find the projected obliquity to be λ = 1.2_-7.4^+8.2 deg, which is consistent with alignment.

Reduced photometry and RV measurements are also available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/631/A76

Keywords: planets and satellites: individual: MASCARA-3; Astrophysics - Earth and Planetary Astrophysics

Domains: Sciences of the Universe [physics]; Astrophysics [astro-ph]

M. Hjorth, S. Albrecht, G. J. J. Talens, F. Grundahl, A. B. Justesen, et al.. MASCARA-3b. A hot Jupiter transiting a bright F7 star in an aligned orbit. Astronomy and Astrophysics - A&A, 2019, 631, ⟨10.1051/0004-6361/201936082⟩. ⟨insu-03666710⟩