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{{Infobox planet
| name                     = Kepler-91b
<!-- DISCOVERY           -->
| discovered               = 2013
| discovery_method         = [[Methods of detecting exoplanets#Transit photometry|Transit]] ([[Kepler Mission]])
<!-- DESIGNATIONS        -->
<!-- ORBITAL             --> 
| apsis                    = astron
| semimajor                = {{val|0.072|+0.007|-0.002}} [[astronomical unit|AU]]
| period                   = {{val|6.24658}} [[day|d]]
| inclination              = {{val|68.5|+1.6|-1}}
| star                     = [[Kepler-91]]
<!-- PHYS CHARS          --> 
| mean_radius              = {{val|1.322|+0.094|-0.086}} {{Jupiter radius|link=y}}
| mass                     = {{val|0.88|+0.33|-0.17}} {{Jupiter mass|link=y}}
| density                  = {{convert|0.44|g/cm3|lk=on|abbr=on}}
| albedo                   = 0.39 <ref name="Esteves">{{Cite journal|arxiv=1407.2245|last1= Esteves|first1= Lisa J.|title= Changing Phases of Alien Worlds: Probing Atmospheres of Kepler Planets with High-Precision Photometry|journal= The Astrophysical Journal|volume= 804|issue= 2|pages= 150|last2=  De Mooij|first2= Ernst J. W.|last3= Jayawardhana|first3= Ray|year= 2014|doi= 10.1088/0004-637X/804/2/150|bibcode= 2015ApJ...804..150E|s2cid= 117798959}}</ref>
| single_temperature       = {{val|2132|u=K}}
<!-- ATMOSPHERE          --> 
<!-- NOTES               --> 
}}
'''Kepler-91b''' is a giant 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 space telescope]] 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 to Kepler-91's low density, its shape is distorted to a slightly ellipsoidal shape due to gravitational effects of the planet. Ellipsoidal light variations caused by Kepler-91b constitute more than the third of the 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.<ref name="Lillo-Box">{{Cite journal|arxiv=1312.3943|last1= Lillo-Box|first1= J.|title= Kepler-91b: A planet at the end of its life. Planet and giant host star properties via light-curve variations|journal= Astronomy & Astrophysics|volume= 562|pages= A109|last2=  Barrado|first2= D.|last3=  Moya|first3= A.|last4=  Montesinos|first4= B.|last5=  Montalbán|first5= J.|last6=  Bayo|first6= A.|last7=  Barbieri|first7= M.|last8=  Régulo|first8= C.|last9=  Mancini|first9= L.|last10=  Bouy|first10= H.|last11=  Henning|first11= T.|year= 2013|doi= 10.1051/0004-6361/201322001|bibcode= 2014A&A...562A.109L|s2cid= 118486056}}</ref>

Further analysis managed to question the planetary nature of the object, suspecting that it is a self-luminous object.<ref name="arxiv">{{Cite journal|last1=Sliski|first1=David H.|last2=Kipping|first2=David M.|year=2014|title=A High False Positive Rate for Kepler Planetary Candidates of Giant Stars using Asterodensity Profiling|journal=The Astrophysical Journal|volume=788|issue=2|pages=148|arxiv=1401.1207|bibcode=2014ApJ...788..148S|doi=10.1088/0004-637X/788/2/148|s2cid=118665291}}</ref> However, the planetary nature was eventually confirmed again through both the radial velocity technique<ref>{{Cite journal|last1=Lillo-Box|first1=J.|last2=Barrado|first2=D.|last3=Henning|first3=Th.|last4=Mancini|first4=L.|last5=Ciceri|first5=S.|last6=Figueira|first6=P.|last7=Santos|first7=N. C.|last8=Aceituno|first8=J.|last9=Sánchez|first9=S.|date=August 2014|title=Radial velocity confirmation of Kepler-91 b|url=https://www.aanda.org/articles/aa/abs/2014/08/aa24587-14/aa24587-14.html|journal=Astronomy & Astrophysics|language=en|volume=568|pages=L1|doi=10.1051/0004-6361/201424587|issn=0004-6361|arxiv=1408.1528|s2cid=118424631}}</ref> and re-analysis of the light curve modulations.<ref>{{Cite journal|last1=Barclay|first1=Thomas|last2=Endl|first2=Michael|last3=Huber|first3=Daniel|last4=Foreman-Mackey|first4=Daniel|last5=Cochran|first5=William D.|last6=MacQueen|first6=Phillip J.|last7=Rowe|first7=Jason F.|last8=Quintana|first8=Elisa V.|date=2015|title=Radial Velocity Observations and Light Curve Noise Modeling Confirm that Kepler-91b is a Giant Planet Orbiting a Giant Star|url=http://stacks.iop.org/0004-637X/800/i=1/a=46|journal=The Astrophysical Journal|language=en|volume=800|issue=1|pages=46|doi=10.1088/0004-637X/800/1/46|issn=0004-637X|arxiv=1408.3149|bibcode=2015ApJ...800...46B|s2cid=118528237}}</ref>

==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&nbsp;million years.<ref name="Lillo-Box"/><ref name="Esteves"/>

==Possible trojan companion==
The possibility of a [[trojan planet]] to Kepler-91b was suggested due to the presence of a small dim in the phase-folded light curve at phase 0.68.<ref name="Lillo-Box" /> This was subsequently studied but the conclusion was that the transit-signal was a false-positive.<ref>{{Cite journal|arxiv=1511.01068|last1=Placek|first1=Ben|title=Characterization of Kepler-91b and the Investigation of a Potential Trojan Companion Using EXONEST|journal=The Astrophysical Journal|volume=814|issue=2|pages=147|last2= Knuth|first2=Kevin H.|last3=Angerhausen|first3=Daniel|last4= Jenkins|first4=Jon M.|year=2015|doi=10.1088/0004-637X/814/2/147|bibcode=2015ApJ...814..147P|s2cid=118366565}}</ref>

==References==
{{reflist|refs=

}}

==External links==
*[https://www.technology.org/2013/12/16/kepler-91b-planet-end-life/ Technology.org: Kepler-91b: a planet at the end of its life]

{{Exoplanets}}
{{2013 in space}}

[[Category:Exoplanets discovered in 2013]]
[[Category:Transiting exoplanets]]
[[Category:Exoplanets discovered by the Kepler space telescope]]
[[Category:Lyra]]
[[Category:Hot Jupiters]]

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