| Revision as of 04:37, 14 February 2015 edit82.44.68.56 (talk)No edit summary← Previous edit | Revision as of 23:02, 30 April 2015 edit undoJimp (talk | contribs)Pending changes reviewers64,660 edits use {{val}}Next edit → | ||
| Line 7: | Line 7: | ||
| | RA = {{RA|19|02|41.0}} | | RA = {{RA|19|02|41.0}} | ||
| | DEC = {{DEC|+44|07|00}} | | DEC = {{DEC|+44|07|00}} | ||
| | dist_pc = 1030 |
| dist_pc = {{val|1030|150}} | ||
| | dist_ly = 3360 | | dist_ly = {{val|3360}} | ||
| | app_mag = 12.9 | | app_mag = 12.9 | ||
| | mass = 1.31 |
| mass = {{val|1.31|0.1}} | ||
| | radius = 6.3 |
| radius = {{val|6.3|0.16}} | ||
| | temperature = 4550 |
| temperature = {{val|4550|75}} | ||
| | metallicity = 0.11 |
| metallicity = {{val|0.11|0.07}} | ||
| | age = 4.86 |
| age = {{val|4.86|2.13}} | ||
| }} | }} | ||
| {{Planetbox character | {{Planetbox character | ||
| | mass = 0.88 |
| mass = {{val|0.88|+0.33|-0.17}} | ||
| | radius = 1.322 |
| radius = {{val|1.322|+0.094|-0.086}} | ||
| | stellar_flux = | | stellar_flux = | ||
| | density_cgs = 0.44 | | density_cgs = 0.44 | ||
| | geometric_albedo = 0.39 <ref>http://arxiv.org/pdf/1407.2245v1.pdf</ref> | | geometric_albedo = 0.39 <ref>http://arxiv.org/pdf/1407.2245v1.pdf</ref> | ||
| | temperature = 2132 |
| temperature = {{val|2132|u=K}} | ||
| }} | }} | ||
| {{Planetbox orbit | {{Planetbox orbit | ||
| | period = 6.24658 | | period = {{val|6.24658}} | ||
| | semimajor = 0.072 |
| semimajor = {{val|0.072|+0.007|-0.002}} | ||
| | eccentricity = | | eccentricity = | ||
| | inclination = 68.5 |
| inclination = {{val|68.5|+1.6|-1|a=l}} | ||
| }} | }} | ||
| {{Planetbox discovery | {{Planetbox discovery | ||
| Line 34: | Line 34: | ||
| | discoverers = | | discoverers = | ||
| | discovery_method = ] (]) | | discovery_method = ] (]) | ||
| | detection_methods = Ellipsoidal light variations <br> Reflection/emission modulations | | detection_methods = Ellipsoidal light variations <br /> Reflection/emission modulations | ||
| | discovery_status = Confirmed}} | | discovery_status = Confirmed}} | ||
| {{Planetbox catalog | {{Planetbox catalog | ||
Revision as of 23:02, 30 April 2015
Template:Planetbox begin Template:Planetbox star Template:Planetbox character Template:Planetbox orbit Template:Planetbox discovery Template:Planetbox catalog Template:Planetbox end
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star.
Discovery and further confirmation
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.
Further analysis managed to question the planetary nature of the object, suspecting that it is a self-luminous object. However, the planetary nature was eventually confirmed again.
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
- "[1401.1207] A High False Positive Rate for Kepler Planetary Candidates of Giant Stars using Asterodensity Profiling". arxiv.org. Retrieved 2014-01-20.
- 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
- Changing Phases of Alien Worlds: Probing Atmospheres of Kepler Planets with High-Precision Photometry Lisa J. Esteves, Ernst J. W. De Mooij, Ray Jayawardhana: 10 Jul 2014
External links
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