Qatar-1b: a hot Jupiter orbiting a metal-rich K dwarf star

TL;DR

This paper reports the discovery and initial characterization of Qatar-1b, a hot Jupiter orbiting a metal-rich K dwarf star, identified through the Alsubai Project transit survey, with detailed measurements of its mass, radius, and orbit.

Contribution

It introduces the first planet discovered by the Alsubai Project and details the survey strategy, candidate selection, and initial characterization of Qatar-1b.

Findings

Planet mass: 1.09±0.08 Mjup

Planet radius: 1.16±0.05 Rjup

Orbital period: 1.420033 days

Abstract

We report the discovery and initial characterisation of Qatar-1b, a hot Jupiter orbiting a metal-rich K dwarf star, the first planet discovered by the Alsubai Project exoplanet transit survey. We describe the strategy used to select candidate transiting planets from photometry generated by the Alsubai Project instrument. We examine the rate of astrophysical and other false positives found during the spectroscopic reconnaissance of the initial batch of candidates. A simultaneous fit to the follow-up radial velocities and photometry of Qatar-1b yield a planetary mass of 1.09+/-0.08 Mjup and a radius of 1.16+/-0.05 Rjup. The orbital period and separation are 1.420033 days and 0.0234 AU for an orbit assumed to be circular. The stellar density, effective temperature and rotation rate indicate an age greater than 4 Gyr for the system.