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

## TL;DR

This paper reports the discovery and characterization of MASCARA-3b, a hot Jupiter orbiting a bright F7 star with an aligned orbit, providing detailed measurements of its physical and orbital properties.

## Contribution

First detection of a hot Jupiter around a late F-type star by MASCARA, with comprehensive spectroscopic follow-up confirming its properties and orbital alignment.

## Key findings

- MASCARA-3b has a radius of 1.36 R_Jup and mass of 4.2 M_Jup.
- The planet orbits its star every 5.55 days in an almost circular, aligned orbit.
- The host star's projected rotational velocity is 20.4 km/s.

## Abstract

We report the discovery of MASCARA-3b, a hot Jupiter orbiting its bright (V = 8.33) late F-type host every $5.55149\pm 0.00001$ days in an almost circular orbit ($e = 0.050^{+0.020}_{-0.017}$). 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 $1.36\pm 0.05$ $R_{\text{Jup}}$ and $4.2\pm 0.2$ $M_{\text{Jup}}$. In addition, SONG spectroscopic transit observations were obtained on two separate nights. From analyzing the mean out-of-transit broadening function, we obtain $v\sin i_{\star} = 20.4\pm 0.4$ 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 $\lambda = 1.2^{+8.2}_{-7.4}$ deg, which is consistent with alignment.