CoRoT-7d

CoRoT-7d is an unconfirmed exoplanet that orbits around CoRoT-7, a G-type star younger and smaller than the Sun. This exoplanet is approximately 489 light-years away from the solar system[1] in the constellation Monoceros (the Unicorn). A planetary system of two or three planets was detected around this star:

• CoRoT-7b
• CoRoT-7c
• CoRoT-7d

This exoplanet was discovered by A. P. Hatzes et al in 2010 by the radial velocity method. The nature of CoRoT-7d is not definitively confirmed.

Characteristics

CoRoT-7d's mass is 0.052 times Jupiter, but its volume mass and diameter are unknown. One year on CoRoT-7d is equivalent to 9.021 days on Earth.

Observation

Because of its closeness to its star and its apparent magnitude of +11.7, the exoplanet cannot be seen in a telescope, only its gravitational effect can be detected by Doppler–Fizeau effect on its electromagnetic spectrum (radial velocity method).

Age

Because CoRoT-7 is believed to be about 1,500,000,000 years old, we estimate the age of CoRoT-7d at between 500,000,000 and 1,000,000,000 years.

References

1. Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry

External Links

• "Planet CoRoT-7 d". The Extrasolar Planet Encyclopaedia.
• "Most Earth-like Planet Yet Found". The Night Sky Guy. 26 November 2011. Archived from the original on 26 November 2011.
• Hatzes, A. P.; Dvorak, R.; Wuchterl, G.; Guterman, P.; Hartmann, M.; Fridlund, M.; Gandolfi, D.; Guenther, E.; Pätzold, M. (8 October 2010). "An investigation into the radial velocity variations of CoRoT-7". Astronomy and Astrophysics. 520: A93. doi:10.1051/0004-6361/201014795.