Kepler-409b explained

Kepler-409b
Discovery Method:	Transit
Discovered:	2014
Discoverer:	Kepler space telescope
Alt Names:	KOI-1925, KIC 9955598
Extrasolarplanet:	yes
Semimajor:	0.3192 AU
Period:	d
Star:	Kepler-409
Orbit Ref:	^[1]
Mean Radius:	1.199
Mass:	<6
Density:	<
Eccentricity:	<0.69

Kepler-409b is a super-Earth orbiting Kepler-409, a G-type main-sequence star. Its orbital period around the star is 69 days. Kepler-409b has a radius 1.199 times that of Earth and a mass 6 times that of Earth. Its discovery in 2014 was made through the use of the transit detection method. The transit method was performed by the Kepler space telescope.^[2]

Possible exomoon

In 2020, a possible exomoon was discovered from transit timing variations.^[3] Follow-up observations deemed it unlikely.^[4]

Notes and References

1. Bonomo . A. S. . Dumusque . X. . Massa . A. . Mortier . A. . Bongiolatti . R. . Malavolta . L. . Sozzetti . A. . Buchhave . L. A. . Damasso . M. . Haywood . R. D. . Morbidelli . A. . Latham . D. W. . Molinari . E. . Pepe . F. . Poretti . E. . September 2023 . Cold Jupiters and improved masses in 38 Kepler and K2 small planet systems from 3661 HARPS-N radial velocities: No excess of cold Jupiters in small planet systems . Astronomy & Astrophysics . 677 . A33 . 10.1051/0004-6361/202346211 . 0004-6361. free . 2304.05773 .
2. Web site: 1995 . The Extrasolar Planet Encyclopaedia — Kepler-409b . 11 September 2023 . Extrasolar Planets Encyclopaedia.
3. Fox . Chris . Wiegert . Paul . 2006.12997 . Exomoon Candidates from Transit Timing Variations: Eight Kepler systems with TTVs explainable by photometrically unseen exomoons . Monthly Notices of the Royal Astronomical Society . 23 November 2020 . 501 . 2 . 2378–2393 . 10.1093/mnras/staa3743 . 2021MNRAS.501.2378F . 219980961 .
4. Kipping . David . 2008.03613 . An Independent Analysis of the Six Recently Claimed Exomoon Candidates . The Astrophysical Journal . 8 August 2020. 900 . 2 . L44 . 10.3847/2041-8213/abafa9 . 2020ApJ...900L..44K . 225253170 . free .