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

Abstract : 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 RJup and 4.2 ± 0.2 MJup. 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 ( or via

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Submitted on : Thursday, May 12, 2022 - 5:02:07 PM
Last modification on : Friday, August 5, 2022 - 3:37:49 PM


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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⟩



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