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→55 Cancri e: HTTP --> HTTPS #3, replaced: http://arxiv.org → https://arxiv.org
55 Cancri e is the fourth planet to be discovered in the 55 Cancri system and the closest to its parent star. Like the other worlds, 55 Cancri e was discovered through [[radial velocity]]. It was discovered on August 30, 2004.
55 Cancri e is the fourth planet to be discovered in the 55 Cancri system and the closest to its parent star. Like the other worlds, 55 Cancri e was discovered through [[radial velocity]]. It was discovered on August 30, 2004.
'''55 Cancri e''' is only 0.038 AU from its parent star with an orbit of only 2.8 days. Such a close orbit is often known as a "torch orbit". The minimum mass of the planet is measured to be some 11 times that of Earth or about 60 percent of [[Neptune]]. At this time it is unknown whether the planet is a very small [[gas giant]] or a large terrestrial, rocky world. Another hypothesis is that the world may be a gas giant core that could not accumulate a significantly large gaseous atmosphere.<ref name="exo2">http://arxiv.org/abs/0712.3917</ref>
'''55 Cancri e''' is only 0.038 AU from its parent star with an orbit of only 2.8 days. Such a close orbit is often known as a "torch orbit". The minimum mass of the planet is measured to be some 11 times that of Earth or about 60 percent of [[Neptune]]. At this time it is unknown whether the planet is a very small [[gas giant]] or a large terrestrial, rocky world. Another hypothesis is that the world may be a gas giant core that could not accumulate a significantly large gaseous atmosphere.<ref name="exo2">https://arxiv.org/abs/0712.3917</ref>
===55 Cancri f===
===55 Cancri f===