CoRoT's first seven planets: An overview

TL;DR

The paper reviews CoRoT's first seven exoplanets, highlighting their diverse properties, the expanded range of known planet characteristics, and the potential for detecting Earth-sized planets with high-precision photometry.

Contribution

It provides a comprehensive overview of the first seven CoRoT exoplanets, emphasizing their unique properties and the mission's capability to detect small, terrestrial planets.

Findings

Detection of planets with masses from 5 Earth masses to 21 Jupiter masses.

Identification of planets around stars with very low metallicity.

Evidence of CoRoT's ability to detect Earth-sized planets.

Abstract

The up to 150 day uninterrupted high-precision photometry of about 100000 stars - provided so far by the exoplanet channel of the CoRoT space telescope - gave a new perspective on the planet population of our galactic neighbourhood. The seven planets with very accurate parameters widen the range of known planet properties in almost any respect. Giant planets have been detected at low metallicity, rapidly rotating and active, spotted stars. CoRoT-3 populated the brown dwarf desert and closed the gap of measured physical properties between standard giant planets and very low mass stars. CoRoT extended the known range of planet masses down to 5 Earth masses and up to 21 Jupiter masses, the radii to less than 2 Earth radii and up to the most inflated hot Jupiter found so far, and the periods of planets discovered by transits to 9 days. Two CoRoT planets have host stars with the lowest content of heavy elements known to show a transit hinting towards a different planet-host-star-metallicity relation then the one found by radial-velocity search programs. Finally the properties of the CoRoT-7b prove that terrestrial planets with a density close to Earth exist outside the Solar System. The detection of the secondary transit of CoRoT-1 at the $10^{-5}$-level and the very clear detection of the 1.7 Earth radii of CoRoT-7b at $3.5 10^{-4}$ relative flux are promising evidence of CoRoT being able to detect even smaller, Earth sized planets.