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Kepler-1704b
Discovery
Discovered by	Paul A. Dalba et al.
Discovery date	2021
Designations
Alternative names	KOI-375.01
Orbital characteristics
Periastron	0.16
Apoastron	3.9
Semi-major axis	2.026+0.024; −0.031 AU
Eccentricity	0.921+0.010; −0.015
Orbital period (sidereal)	988.8811177±0.0009114
Inclination	89.01+0.59; −0.27°
Physical characteristics
Mean radius	10.81 R🜨
Mass	4.15 ± 0.29 MJ
Temperature	253.8+3.7; −4.1 K

Kepler-1704b is a super-Jupiter on a highly eccentric orbit around the star Kepler-1704. It has a mass of 4.51 M_J. The planet's distance from its star varies from 0.16 to 3.9 AU. It is a failed hot Jupiter, having been scattered from its birth orbit to orbit with a periastron just above the tidal circularization distance.^[1]

Characteristics

Kepler-1704b is much more massive than Jupiter, at 4.51 M_J.^[1] The high planetary mass makes Kepler-1704b a super-Jupiter. Kepler-1704b goes on a highly eccentric 2.7 year-long (988.88 days) orbit around its star as well as transiting.^[1] The extreme eccentricity yields a temperature difference of up to 700 K.^[1]

Star

The star, Kepler-1704, is a G2, 5745-kelvin star 825 parsecs (2,690 ly) from Earth and the sun. It has a mass of 1.131 M_☉, a radius of 1.697 R_☉, and a luminosity of 2.83 L_☉. The high radius for the star's mass hints that Kepler-1704 is not a main-sequence star.^[3]

References

^ ^a ^b ^c ^d ^e ^f Dalba, Paul A.; Kane, Stephen R.; Li, Zhexing; Macdougall, Mason G.; Rosenthal, Lee J.; Cherubim, Collin; Isaacson, Howard; Thorngren, Daniel P.; Fulton, Benjamin; Howard, Andrew W.; Petigura, Erik A. (2021-07-14). "Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. II. Discovery of a Failed Hot Jupiter on a 2.7 Yr, Highly Eccentric Orbit". The Astronomical Journal. 162 (4): 154. arXiv:2107.06901. Bibcode:2021AJ....162..154D. doi:10.3847/1538-3881/ac134b. S2CID 235898945.
^ ^a ^b "Kepler Objects of Interest". exoplanetarchive.ipac.caltech.edu. Retrieved 2021-07-25.
^ Dalba, Paul A.; Kane, Stephen R.; Li, Zhexing; Macdougall, Mason G.; Rosenthal, Lee J.; Cherubim, Collin; Isaacson, Howard; Thorngren, Daniel P.; Fulton, Benjamin; Howard, Andrew W.; Petigura, Erik A.; Schwieterman, Edward W.; Peluso, Dan O.; Esposito, Thomas M.; Marchis, Franck; Payne, Matthew J. (2021). "Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. II. Discovery of a Failed Hot Jupiter on a 2.7 Yr, Highly Eccentric Orbit". The Astronomical Journal. 162 (4): 154. arXiv:2107.06901. Bibcode:2021AJ....162..154D. doi:10.3847/1538-3881/ac134b. S2CID 235898945.