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| | discoverers = | | discoverers = | ||
| | discovery_method = ] (]) | | discovery_method = ] (]) | ||
| | detection_methods = Ellipsoidal light variations <br> |
| detection_methods = Ellipsoidal light variations <br> Reflection/emission modulations | ||
| | discovery_status = Confirmed | | discovery_status = Confirmed | ||
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Revision as of 10:06, 26 December 2013
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Kepler-91b is a planet orbiting Kepler-91, star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star.
Discovery
Kepler-91b was detected by analyzing the data of Kepler spacecraft where a transit-like signal was found. Initially thought to be a false positive due to light curve variations by a self-luminous object, it was later revealed that due low density of Kepler-91's shape is distorted to slightly ellipsoidal shape due to gravitational effects of the planet. Ellipsoidal light variations caused by Kepler-91b constitute more than the third of light variations compared to transit depth. Ellipsoidal light variations also allowed to determine the planet's mass. It was also found that Kepler-91b reflects some of the starlight from its star.
Characteristics
Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, transit was detected due to low semi-major axis to host star radius ratio.
Kepler-91b is expected to be engulfed by the parent star within about 55 million years.
References
- Kepler-91b: a planet at the end of its life. Planet and giant host star properties via light-curve variations
- Kepler-91b: a planet at the end of its life. Planet and giant host star properties via light-curve variations J. Lillo-Box, D. Barrado, A. Moya, B. Montesinos, J. Montalbán, A. Bayo, M. Barbieri, C. Régulo, L. Mancini, H. Bouy, T. Henning: 14 Dec 2013
External links
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