{{Short description|Exoplanet}} {{Distinguish|Kepler-296b}} {{Notability|Astro|date=April 2021}} {{Infobox planet | extrasolarplanet = yes | name = K2-296b | image = K2-296b.jpg | caption = Size comparison of the planet K2-296b (''artistic concept'') with Earth | apsis = astron | discovery_ref = <ref name="exoplanet.eu"/> | discoverer = René Heller ''et al.'' | discovered = 2019 | discovery_method = Transit method | alt_names = EPIC 201238110 b, TIC 35019000 b, UCAC4 434-056021 b<ref>{{cite simbad |title=K2-296 |access-date=2024-07-19}}</ref> | orbit_ref = <ref name=":0"/> | periastron = | apoastron = | semimajor = 0.135 | avg_speed = <!--(Average orbital speed)--> | eccentricity = | period = {{val|28.1696|-0.0043|+0.0038}} <ref name="K2"/> | inclination = 89.8° | angular_dist = | long_periastron = <!--(Longitude of periastron)--> | time_periastron = <!--(Time of periastron)--> | semi-amplitude = | physical_ref = <ref name="exoplanet.eu"/> | mean_radius = {{val|0.167|-0.018|+0.04|ul=Jupiter radius}} | surface_area = | volume = | density = | mass = ~4.2 {{Earth mass|sym=y|link=y}}<ref name=":0"/> | surface_grav = <!--Equatorial surface gravity--> | moment_of_inertia_factor = | escape_velocity = | albedo = | single_temperature = {{val|277|ul=K}} ({{convert|277|K|C F|disp=out}}, equilibrium)<ref name=":0"/> |star=EPIC 201238110}}'''K2-296b''' (more commonly referred to as '''EPIC 201238110 b''') is a potentially habitable<ref name=":0"/> planet discovered by Heller et al.<ref name="Exoplanet Archive"/> in 2019, orbiting the M-dwarf star<ref name=Heller2019/> EPIC 201238110.
== Habitability == K2-296b's orbit, which has a semi-major axis of {{convert|0.135|AU|km|abbr=on}},<ref name=":0"/> is located in the habitable zone of the planetary system, meaning liquid water could exist on its surface.<ref name="Heller2019"/> Its equilibrium temperature is estimated at {{convert|277|K|C F}}.<ref name=":0"/> The planet is likely tidally locked to its parent star.<ref name="Heller2019"/> The Habitable Worlds Catalog, issued by the Planetary Habitability Laboratory, classes the planet as a warm superterran, near the inner edge of the optimistic habitable zone.<ref name=":0"/>
== Host star == The host star, EPIC 201238110, is a red dwarf with a mass of 0.41 {{Solar mass|link=y}}<ref name="Heller2019"/> and a radius of 0.37 {{Solar radius|link=y}}.<ref name=":0"/> It has a surface temperature of 3588 K<ref>{{Cite Gaia DR2|3600975145895223040}}</ref> or 3772 K,<ref name=":0"/> and a luminosity of 0.0254 {{Solar luminosity|link=y}}.<ref name=":0"/> There is another transiting<ref name="Exoplanet Archive"/> candidate planet in the system called EPIC 201238110 c, which, if confirmed, would be a hot (427 K) mini-Neptune with a radius of 2.76 {{Earth radius}} and a mass of 8.0 {{Earth mass|sym=y}}, revolving around the star once every 7.9 days at a distance of {{convert|0.058|AU|km|abbr=on}}.<ref name=":0" />
== References == <references>
<ref name="Exoplanet Archive">{{Cite Exoplanet Archive|EPIC 201238110|access-date=2024-07-19}}</ref>
<ref name="exoplanet.eu">{{Cite web|title=The Extrasolar Planet Encyclopaedia — EPIC 201238110 b|url=https://exoplanet.eu/catalog/epic_201238110_b--7756/|work=Extrasolar Planets Encyclopaedia|access-date=2021-04-15}}</ref>
<ref name="K2">{{cite journal | last = Hardegree-Ullman | first = Kevin K. | title = Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 R⊕ | date =2020-03-10 | journal = The Astrophysical Journal Supplement| volume = 247 | issue = 28 | page = 28 | doi = 10.3847/1538-4365/ab7230| arxiv = 2001.11511 | bibcode = 2020ApJS..247...28H | s2cid = 211003631 | url = https://resolver.caltech.edu/CaltechAUTHORS:20200310-154033341 | doi-access = free }}</ref>
<ref name=Heller2019>{{cite journal|title=Transit least-squares survey -- II. Discovery and validation of 17 new sub- to super-Earth-sized planets in multi-planet systems from K2|last1=Heller|first1=René|last2= Hippke|first2=Michael|last3=Rodenbeck|first3=Kai|journal=Astronomy and Astrophysics|volume=627|date=July 2019|doi=10.1051/0004-6361/201935600|arxiv=1905.09038}}</ref>
<ref name=":0">{{Cite web|title=plot_K2-296.png|date=2019-09-03|publisher=Planetary Habitability Laboratory|url=https://www.hpcf.upr.edu/~abel/phl/hec2/splots/plot_K2-296.png}}</ref>
</references>
Category:Exoplanets discovered by K2 Category:Exoplanets discovered in 2019 Category:Exoplanets in the habitable zone Category:Transiting exoplanets
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