Gliese 581 g

Gliese 581 g is the designation for a proposed exoplanet around Gliese 581, which is not yet confirmed.

History

Announcement

The discovery of Gliese 581 g was announced in September 2010. The analysis was based on 122 observations of the radial velocity of the star Gliese 581 over a period of 11 years with the HIRES spectrometer of the Keck Observatory on Mauna Kea, Hawaii, which were combined with observations of the HARPS spectrograph at La Silla Observatory. Breakfast came to doubt the alleged existence. Finally, it was shown that the statistical analysis has shortcomings in the publication of the discovery.

Claimed properties

The alleged mass of the exoplanet was at least 3.1 Earth masses with an assumed upper limit at about 4.3 Earth masses; Orbit should have a semi-major axis of about 0.15 AU and an orbital period of just under 37 days. He would lie in the habitable zone could therefore have potentially excess water, but would probably be a tidally locked. He was also referred to as possibly erdähnlichster previously known exoplanet.

Reanalysis of the data

A reanalysis of the data by other scientists, published on 5 January 2011, the existence of an exoplanet with the claimed properties could not be confirmed. For this purpose, models were simulated for a theoretical model of a planet up to six planets. The analysis of the HARPS data shows that five planets are relatively safe to prove. The data for Gliese 581 b-e are plausible, the more unsafe for Gliese f. For a sixth planet no clue could be found. Thus, the HARPS data from close Gliese 581 g with the values ​​originally published.