Kepler-409b

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.^[1]

Kepler-409b

Discovery
Discovered by	Kepler space telescope
Discovery date	2014
Detection method	Transit
Designations
Alternative names	KOI-1925, KIC 9955598[1]
Orbital characteristics[2]
Semi-major axis	0.3192 AU
Eccentricity	<0.69
Orbital period (sidereal)	68.9583216±0.0000039 d
Inclination	86.30±0.13
Star	Kepler-409
Physical characteristics
Mean radius	1.199 R🜨
Mass	<6 ME
Mean density	<19 g/cm3
Temperature	438±7 K

Possible exomoon

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

References

1. "The Extrasolar Planet Encyclopaedia — Kepler-409b". Extrasolar Planets Encyclopaedia. 1995. Retrieved 11 September 2023.
2. 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. arXiv:2304.05773. Bibcode:2023A&A...677A..33B. doi:10.1051/0004-6361/202346211. ISSN 0004-6361.
3. Fox, Chris; Wiegert, Paul (23 November 2020). "Exomoon Candidates from Transit Timing Variations: Eight Kepler systems with TTVs explainable by photometrically unseen exomoons". Monthly Notices of the Royal Astronomical Society. 501 (2): 2378–2393. arXiv:2006.12997. Bibcode:2021MNRAS.501.2378F. doi:10.1093/mnras/staa3743. S2CID 219980961.
4. Kipping, David (8 August 2020). "An Independent Analysis of the Six Recently Claimed Exomoon Candidates". The Astrophysical Journal. 900 (2): L44. arXiv:2008.03613. Bibcode:2020ApJ...900L..44K. doi:10.3847/2041-8213/abafa9. S2CID 225253170.