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{{Short description|Exoplanet in constellation Taurus}}
{{Infobox planet
{{Infobox planet
| name = K2-155d
| name = K2-155d
<!-- DISCOVERY -->
<!-- DISCOVERY -->
| discoverer = Teruyuki Hirano et al. <ref name ="TTN">{{Cite web|title=15 new planets confirmed around cool dwarf stars|url=https://www.titech.ac.jp/english/news/2018/040761.html|publisher=[[Tokyo Institute of Technology|Tokyo Tech News]]|date=March 12, 2018}}</ref>
| discoverer = Teruyuki Hirano{{cn|date=June 2019}}
| discovery_site = [[Tokyo Institute of Technology]]
| discovery_site = [[Tokyo Institute of Technology]]
| discovered = March 2018
| discovered = March 2018
| discovery_method = [[Transit method]]
| discovery_method = [[Transit method]]
<!-- DESIGNATIONS -->
<!-- DESIGNATIONS -->
| alt_names = LP 415-17 c, EPIC 210897587 c<ref name ="exoplanet">{{cite encyclopedia |title=The Extrasolar Planet Encyclopaedia — K2-155 d |url=https://exoplanet.eu/catalog/k2_155_d--6709/ |encyclopedia=[[Extrasolar Planets Encyclopaedia]] |access-date=2024-04-29}}</ref>
<!-- ORBITAL -->
<!-- ORBITAL -->
| apsis = astron
| apsis = astron
| semimajor = 0.1886 (± 0.0066)<ref name=Hirano_et_al_2018/> [[astronomical unit|AU]]
| semimajor = 0.1886 (± 0.0066)<ref name="Hirano_et_al_2018" /> [[astronomical unit|AU]]
| eccentricity = unknown
| eccentricity = unknown
| period = 40.6835 (± 0.0031)<ref name=Hirano_et_al_2018/> [[day|d]]
| period = 40.6835 (± 0.0031)<ref name="Hirano_et_al_2018" /> [[day|d]]
| inclination = unknown
| inclination = unknown
| star = [[K2-155]]
| star = [[K2-155]]
<!-- PHYS CHARS -->
<!-- PHYS CHARS -->
| mean_radius = 1.64 {{±|0.18|0.17}}<ref name=Hirano_et_al_2018/> {{Earth radius|link=y}}
| mean_radius = 1.64 {{±|0.18|0.17}}<ref name="Hirano_et_al_2018" /> {{Earth radius|link=y}}
| density = {{convert|5.41|±|1.11|kg/m3|lk=on|abbr=on}}
| density = {{val|5.41|1.11|ul=g/cm3}}
| single_temperature = {{convert|289|K|C F}}<ref name="HEC">{{Cite web|title=HEC: Exoplanets Calculator (K2-155d)|url=http://phl.upr.edu/projects/habitable-exoplanets-catalog/calculators|publisher=Planetary Habibility Laboratory}}</ref>
| single_temperature = {{convert|289|K|C F}}<ref name="HEC">{{Cite web|title=HEC: Exoplanets Calculator (K2-155d)|url=http://phl.upr.edu/projects/habitable-exoplanets-catalog/calculators|publisher=Planetary Habibility Laboratory|access-date=2018-03-30|archive-date=2017-08-24|archive-url=https://web.archive.org/web/20170824164045/http://phl.upr.edu/projects/habitable-exoplanets-catalog/calculators|url-status=dead}}</ref>
<!-- ATMOSPHERE -->
<!-- ATMOSPHERE -->
<!-- NOTES -->
<!-- NOTES -->
}}
}}
'''K2-155d''' is a potentially habitable [[Super-Earth]] [[exoplanet]] in the [[K2-155]] system.<ref name=CNET>{{cite web|last1=Mack|first1=Eric|title=A super-Earth around a red star could be wet and wild|url=https://www.cnet.com/news/super-earth-exoplanet-k2-155d-found-could-be-habitable-nasa/|website=[[CNET]]|date=March 13, 2018}}</ref> It is the outermost of three known planets orbiting K2-155, a bright [[red dwarf]] star in the constellation [[Taurus (constellation)|Taurus]].{{cn|date=June 2019}} It is one of 15 new exoplanets around red dwarf stars discovered by Japanese astronomer Teruyuki Hirano of the [[Tokyo Institute of Technology]] and his team.<ref>{{Cite web|title=15 new planets confirmed around cool dwarf stars|url=https://www.titech.ac.jp/english/news/2018/040761.html|publisher=[[Tokyo Institute of Technology|Tokyo Tech News]]|date=March 12, 2018}}</ref> The team used data from NASA's [[Kepler (spacecraft)|Kepler Space Telescope]] during its extended K2 "Second Light" mission. K2-155d orbits near the so-called habitable zone of its system, and has the potential to host liquid water.<ref name=Newsweek/><ref name=CNET/>
'''K2-155d''' is a potentially habitable [[Super-Earth]] [[exoplanet]] in the [[K2-155]] system.<ref name="CNET">{{cite web|last1=Mack|first1=Eric|title=A super-Earth around a red star could be wet and wild|url=https://www.cnet.com/news/super-earth-exoplanet-k2-155d-found-could-be-habitable-nasa/|website=[[CNET]]|date=March 13, 2018}}</ref> It is the outermost of three known planets orbiting around the [[K-type main-sequence star|K-type]] star [[K2-155]] in the constellation [[Taurus (constellation)|Taurus]], approximately 290 [[light year]]s (90 [[parsec]]s) from Earth.<ref name="K2-155_NASA_Exoplanet_Archive">{{Cite web|title=K2-155 PLANET HOST OVERVIEW PAGE |url=https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-155|publisher=[[NASA Exoplanet Archive]]}}</ref> It is one of 15 new exoplanets around red dwarf stars discovered by Japanese astronomer Teruyuki Hirano of the [[Tokyo Institute of Technology]] and his team.<ref name="TTN" /> The team used data from NASA's [[Kepler (spacecraft)|Kepler Space Telescope]] during its extended K2 "Second Light" mission. K2-155d orbits near the so-called habitable zone of its system, and has the potential to host liquid water.<ref name="Newsweek" /><ref name="CNET" />


==Discovery and observations==
==Discovery and observations==
K2-155d is one of 15 exoplanets discovered by a team of Japanese astronomers led by Teruyuki Hirano at the Tokyo Institute of Technology.<ref name=CNET/> Its discovery is based on data from the K2 mission of NASA's [[Kepler (spacecraft)|Kepler spacecraft]].<ref name=CNET/> The exoplanet has also been observed from ground-based telescopes including the [[Nordic Optical Telescope]] (NOT) in La Palma and the [[Subaru Telescope]] in Hawaii.<ref name=CNET/> Its characteristics were confirmed using [[speckle imaging]] and [[Optical spectroscopy|high-dispersion optical spectroscopy]].<ref name=Hirano_et_al_2018/> The mass of K2-155d and the brightness of its host star may be measured by future observations from the [[W. M. Keck Observatory]] and the [[James Webb Space Telescope]].<ref name=Hirano_et_al_2018/> The brightness of its host star makes K2-155d a good target for future studies using instruments such as the James Webb Space Telescope.<ref name=Hirano_et_al_2018/>
K2-155d is one of 15 exoplanets discovered by a team of Japanese astronomers led by Teruyuki Hirano at the Tokyo Institute of Technology.<ref name="CNET" /> Its discovery is based on data from the K2 mission of NASA's [[Kepler (spacecraft)|Kepler spacecraft]].<ref name="CNET" /> The exoplanet has also been observed from ground-based telescopes including the [[Nordic Optical Telescope]] (NOT) in La Palma and the [[Subaru Telescope]] in Hawaii.<ref name="CNET" /> Its characteristics were confirmed using [[speckle imaging]] and [[Optical spectroscopy|high-dispersion optical spectroscopy]].<ref name="Hirano_et_al_2018" /> The mass of K2-155d and the brightness of its host star may be measured by future observations from the [[W. M. Keck Observatory]] and the [[James Webb Space Telescope]].<ref name="Hirano_et_al_2018" /> The brightness of its host star makes K2-155d a good target for future studies using instruments such as the James Webb Space Telescope.<ref name="Hirano_et_al_2018" />


==Characteristics==
==Characteristics==
K2-155d is a super-Earth exoplanet with a radius 1.64 times that of Earth, near the transition zone between small rock-based and larger gaseous planets.<ref name="Exoplanet Archive">{{Cite web|title=Confirmed Planet Overview Page: K2-155d|url=https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-155+d&type=CONFIRMED_PLANET|publisher=[[NASA Exoplanet Archive]]|year=2018}}</ref><ref name=Hirano_et_al_2018>{{cite journal | title=K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths | display-authors=1 | last1=Hirano | first1=Teruyuki | last2=Dai | first2=Fei | last3=Livingston | first3=John H. | last4=Fujii | first4=Yuka | last5=Cochran | first5=William D. | last6=Endl | first6=Michael | last7=Gandolfi | first7=Davide | last8=Redfield | first8=Seth | last9=Winn | first9=Joshua N. | last10=Guenther | first10=Eike W. | last11=Prieto-Arranz | first11=Jorge | last12=Albrecht | first12=Simon | last13=Barragan | first13=Oscar | last14=Cabrera | first14=Juan | last15=Cauley | first15=P. Wilson | last16=Csizmadia | first16=Szilard | last17=Deeg | first17=Hans | last18=Eigmüller | first18=Philipp | last19=Erikson | first19=Anders | last20=Fridlund | first20=Malcolm | last21=Fukui | first21=Akihiko | last22=Grziwa | first22=Sascha | last23=Hatzes | first23=Artie P. | last24=Korth | first24=Judith | last25=Narita | first25=Norio | last26=Nespral | first26=David | last27=Niraula | first27=Prajwal | last28=Nowak | first28=Grzegorz | last29=Pätzold | first129=Martin | last30=Palle | first30=Enric | last31=Persson | first31=Carina M. | last32=Rauer | first32=Heike | last33=Ribas | first33=Ignasi | last34=Smith | first34=Alexis M. S. | last35=Van Eylen, Vincent | journal=[[The Astronomical Journal]] | volume=155 | issue=3 | id=124 | pages=11 | date=March 2018 | doi=10.3847/1538-3881/aaaa6e | bibcode=2018AJ....155..124H | arxiv=1801.06957 }}</ref><ref name=Newsweek>{{cite magazine|last1=Dovey|first1=Dana|title=Super Earth 200 Light-Years Away May Hold Ideal Temperatures For Liquid Water And Life|url=http://www.newsweek.com/space-exoplanet-dwarf-star-k2-155d-843565|magazine=[[Newsweek]]|date=March 14, 2018}}</ref> Climate models predict that it is located near its star's [[Circumstellar habitable zone|habitable zone]] and has an [[Solar irradiance|insolation]] 1.67 ± 0.38 (between 1.29 and 2.05) times that of Earth.<ref name=Hirano_et_al_2018/> Its physical temperature is estimated to be 289 K, which is 16 degrees Celsius or 61 degrees Fahrenheit.<ref name="HEC"/> Studies have shown that the planet would maintain a moderate surface temperature if its insolation is smaller than ∼1.5 times that of Earth.<ref name=Hirano_et_al_2018/>
K2-155d is a super-Earth exoplanet with a radius 1.64 times that of Earth, near the transition zone between small rock-based and larger gaseous planets.<ref name="Exoplanet Archive">{{Cite web|title=Confirmed Planet Overview Page: K2-155d|url=https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=K2-155+d&type=CONFIRMED_PLANET|publisher=[[NASA Exoplanet Archive]]|year=2018}}</ref><ref name="Hirano_et_al_2018">{{cite journal | title=K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths | display-authors=1 | last1=Hirano | first1=Teruyuki | last2=Dai | first2=Fei | last3=Livingston | first3=John H. | last4=Fujii | first4=Yuka | last5=Cochran | first5=William D. | last6=Endl | first6=Michael | last7=Gandolfi | first7=Davide | last8=Redfield | first8=Seth | last9=Winn | first9=Joshua N. | last10=Guenther | first10=Eike W. | last11=Prieto-Arranz | first11=Jorge | last12=Albrecht | first12=Simon | last13=Barragan | first13=Oscar | last14=Cabrera | first14=Juan | last15=Cauley | first15=P. Wilson | last16=Csizmadia | first16=Szilard | last17=Deeg | first17=Hans | last18=Eigmüller | first18=Philipp | last19=Erikson | first19=Anders | last20=Fridlund | first20=Malcolm | last21=Fukui | first21=Akihiko | last22=Grziwa | first22=Sascha | last23=Hatzes | first23=Artie P. | last24=Korth | first24=Judith | last25=Narita | first25=Norio | last26=Nespral | first26=David | last27=Niraula | first27=Prajwal | last28=Nowak | first28=Grzegorz | last29=Pätzold | first29=Martin | last30=Palle | first30=Enric | last31=Persson | first31=Carina M. | last32=Rauer | first32=Heike | last33=Ribas | first33=Ignasi | last34=Smith | first34=Alexis M. S. | last35=Van Eylen, Vincent | journal=[[The Astronomical Journal]] | volume=155 | issue=3 | id=124 | pages=11 | date=March 2018 | doi=10.3847/1538-3881/aaaa6e | bibcode=2018AJ....155..124H | arxiv=1801.06957 | s2cid=73590567 | doi-access=free }}</ref><ref name="Newsweek">{{cite magazine|last1=Dovey|first1=Dana|title=Super Earth 200 Light-Years Away May Hold Ideal Temperatures For Liquid Water And Life|url=http://www.newsweek.com/space-exoplanet-dwarf-star-k2-155d-843565|magazine=[[Newsweek]]|date=March 14, 2018}}</ref> Climate models predict that it is located near its star's [[Circumstellar habitable zone|habitable zone]] and has an [[Solar irradiance|insolation]] 1.67 ± 0.38 (between 1.29 and 2.05) times that of Earth.<ref name="Hirano_et_al_2018" /> Its physical temperature is estimated to be 289 K (16 degrees Celsius or 61 degrees Fahrenheit).<ref name="HEC" /> Studies have shown that the planet would maintain a moderate surface temperature if its insolation is smaller than ~1.5 times that of Earth.<ref name="Hirano_et_al_2018" />


K2-155d is one of three known planets in the system orbiting [[K2-155]], a red dwarf star located 200 light years from Earth.{{cn|date=June 2019}} Its parent star has 88% less volume than the Sun.<ref name=Exoplorer.org>{{Cite web|title=K2-155d|url=http://exoplorer.org/en/exoplanets/k2-155-d|publisher=[[Exoplanet Data Explorer]]|year=2018}}</ref> K2-155d orbits its star with a 40.7 day period, but as the planet is tidally locked the same side always faces its sun.<ref name=CNET/> K2-155d has an orbital radius of 0.1886{{nbs}}AU<ref name="Exoplanet Archive"/> and studies suggest that the planet has a low orbital eccentricity.<ref>{{Cite journal|last1=Eylen|first1=Vincent|last2=Albrecht|first2=Simon|title=Eccentricity from transit photometry: small planets in Kepler multi-planet systems have low eccentricities|journal=The Astrophysical Journal|volume=808|issue=2|pages=126|arxiv=1505.02814|date=May 11, 2015|doi=10.1088/0004-637X/808/2/126|bibcode=2015ApJ...808..126V}}</ref>
K2-155d is one of three known planets in the system orbiting [[K2-155]], a red dwarf star located {{convert|62.3|pc|ly}} from Earth.<ref name="Hirano_et_al_2018"/> Its parent star has 88% less volume than the Sun.<ref name="Exoplorer.org">{{Cite web|title=K2-155d|url=http://exoplorer.org/en/exoplanets/k2-155-d|publisher=[[Exoplanet Data Explorer]]|year=2018|access-date=2018-03-21|archive-date=2018-03-22|archive-url=https://web.archive.org/web/20180322021039/http://exoplorer.org/en/exoplanets/k2-155-d|url-status=dead}}</ref> K2-155d orbits its star with a 40.7 day period, but as the planet is tidally locked the same side always faces its sun.<ref name="CNET" /> K2-155d has an orbital radius of 0.1886{{nbs}}AU<ref name="Exoplanet Archive" /> and studies suggest that the planet has a low orbital eccentricity.<ref>{{Cite journal|last1=Eylen|first1=Vincent|last2=Albrecht|first2=Simon|title=Eccentricity from transit photometry: small planets in Kepler multi-planet systems have low eccentricities|journal=The Astrophysical Journal|volume=808|issue=2|pages=126|arxiv=1505.02814|date=May 11, 2015|doi=10.1088/0004-637X/808/2/126|bibcode=2015ApJ...808..126V|s2cid=14405731 }}</ref>


==Potential habitability==
==Potential habitability==
K2-155d has been labeled a potentially habitable planet that may be able to harbor liquid water.<ref name=Newsweek/><ref name=CNET/> A three-dimensional [[Climate model|climate simulation]] was used to confirm the possibility of the existence of water.<ref name=CNET/> However, its discoverer Teruyuki Hirano was cautious about the findings, stating that they do not guarantee K2-155d is habitable, as the ranges in its orbit and temperature allow the possibility of it being outside the habitable zone.<ref name=Newsweek/> Factors such as the absence of solar flares could also decide if K2-155d is habitable.<ref name=CNET/>
K2-155d has been labeled a potentially habitable planet that may be able to harbor liquid water.<ref name="Newsweek" /><ref name="CNET" /> A three-dimensional [[Climate model|climate simulation]] was used to confirm the possibility of the existence of water.<ref name="CNET" /> However, its discoverer Teruyuki Hirano was cautious about the findings, stating that they do not guarantee K2-155d is habitable, as the ranges in its orbit and temperature allow the possibility of it being outside the habitable zone.<ref name="Newsweek" /> Factors such as the absence of solar flares could also decide if K2-155d is habitable.<ref name="CNET" />

[[File:K2-155d.jpg|thumb|Size comparison of the planet K2-155 d (''artistic concept'') with Earth]]


==References==
==References==
{{Wikinews|Scientists report exoplanet K2-155d could hold liquid water}}
{{reflist}}
{{reflist}}


{{2018 in space}}
{{2018 in space}}
{{Taurus (constellation)}}
{{Stars of Taurus}}


[[Category:Exoplanets discovered in 2018]]
[[Category:Exoplanets discovered in 2018]]
[[Category:Super-Earths in the habitable zone]]
[[Category:Super-Earths in the habitable zone]]
[[Category:Taurus (constellation)]]
[[Category:Taurus (constellation)]]
[[Category:Exoplanets discovered by K2]]
[[Category:Transiting exoplanets]]
[[Category:Transiting exoplanets]]
[[Category:Discoveries by the Mauna Kea Observatories]]
[[Category:Discoveries by the Mauna Kea Observatories]]

Latest revision as of 02:25, 19 November 2024

K2-155d
Discovery
Discovered byTeruyuki Hirano et al. [1]
Discovery siteTokyo Institute of Technology
Discovery dateMarch 2018
Transit method
Designations
LP 415-17 c, EPIC 210897587 c[2]
Orbital characteristics
0.1886 (± 0.0066)[3] AU
Eccentricityunknown
40.6835 (± 0.0031)[3] d
Inclinationunknown
StarK2-155
Physical characteristics
1.64 +0.18
−0.17[3] R🜨
Mean density
5.41±1.11 g/cm3
Temperature289 K (16 °C; 61 °F)[4]

K2-155d is a potentially habitable Super-Earth exoplanet in the K2-155 system.[5] It is the outermost of three known planets orbiting around the K-type star K2-155 in the constellation Taurus, approximately 290 light years (90 parsecs) from Earth.[6] It is one of 15 new exoplanets around red dwarf stars discovered by Japanese astronomer Teruyuki Hirano of the Tokyo Institute of Technology and his team.[1] The team used data from NASA's Kepler Space Telescope during its extended K2 "Second Light" mission. K2-155d orbits near the so-called habitable zone of its system, and has the potential to host liquid water.[7][5]

Discovery and observations

[edit]

K2-155d is one of 15 exoplanets discovered by a team of Japanese astronomers led by Teruyuki Hirano at the Tokyo Institute of Technology.[5] Its discovery is based on data from the K2 mission of NASA's Kepler spacecraft.[5] The exoplanet has also been observed from ground-based telescopes including the Nordic Optical Telescope (NOT) in La Palma and the Subaru Telescope in Hawaii.[5] Its characteristics were confirmed using speckle imaging and high-dispersion optical spectroscopy.[3] The mass of K2-155d and the brightness of its host star may be measured by future observations from the W. M. Keck Observatory and the James Webb Space Telescope.[3] The brightness of its host star makes K2-155d a good target for future studies using instruments such as the James Webb Space Telescope.[3]

Characteristics

[edit]

K2-155d is a super-Earth exoplanet with a radius 1.64 times that of Earth, near the transition zone between small rock-based and larger gaseous planets.[8][3][7] Climate models predict that it is located near its star's habitable zone and has an insolation 1.67 ± 0.38 (between 1.29 and 2.05) times that of Earth.[3] Its physical temperature is estimated to be 289 K (16 degrees Celsius or 61 degrees Fahrenheit).[4] Studies have shown that the planet would maintain a moderate surface temperature if its insolation is smaller than ~1.5 times that of Earth.[3]

K2-155d is one of three known planets in the system orbiting K2-155, a red dwarf star located 62.3 parsecs (203 ly) from Earth.[3] Its parent star has 88% less volume than the Sun.[9] K2-155d orbits its star with a 40.7 day period, but as the planet is tidally locked the same side always faces its sun.[5] K2-155d has an orbital radius of 0.1886 AU[8] and studies suggest that the planet has a low orbital eccentricity.[10]

Potential habitability

[edit]

K2-155d has been labeled a potentially habitable planet that may be able to harbor liquid water.[7][5] A three-dimensional climate simulation was used to confirm the possibility of the existence of water.[5] However, its discoverer Teruyuki Hirano was cautious about the findings, stating that they do not guarantee K2-155d is habitable, as the ranges in its orbit and temperature allow the possibility of it being outside the habitable zone.[7] Factors such as the absence of solar flares could also decide if K2-155d is habitable.[5]

Size comparison of the planet K2-155 d (artistic concept) with Earth

References

[edit]
  1. ^ a b "15 new planets confirmed around cool dwarf stars". Tokyo Tech News. March 12, 2018.
  2. ^ "The Extrasolar Planet Encyclopaedia — K2-155 d". Extrasolar Planets Encyclopaedia. Retrieved 2024-04-29.
  3. ^ a b c d e f g h i j Hirano, Teruyuki; et al. (March 2018). "K2-155: A Bright Metal-poor M Dwarf with Three Transiting Super-Earths". The Astronomical Journal. 155 (3): 11. arXiv:1801.06957. Bibcode:2018AJ....155..124H. doi:10.3847/1538-3881/aaaa6e. S2CID 73590567. 124.
  4. ^ a b "HEC: Exoplanets Calculator (K2-155d)". Planetary Habibility Laboratory. Archived from the original on 2017-08-24. Retrieved 2018-03-30.
  5. ^ a b c d e f g h i Mack, Eric (March 13, 2018). "A super-Earth around a red star could be wet and wild". CNET.
  6. ^ "K2-155 PLANET HOST OVERVIEW PAGE". NASA Exoplanet Archive.
  7. ^ a b c d Dovey, Dana (March 14, 2018). "Super Earth 200 Light-Years Away May Hold Ideal Temperatures For Liquid Water And Life". Newsweek.
  8. ^ a b "Confirmed Planet Overview Page: K2-155d". NASA Exoplanet Archive. 2018.
  9. ^ "K2-155d". Exoplanet Data Explorer. 2018. Archived from the original on 2018-03-22. Retrieved 2018-03-21.
  10. ^ Eylen, Vincent; Albrecht, Simon (May 11, 2015). "Eccentricity from transit photometry: small planets in Kepler multi-planet systems have low eccentricities". The Astrophysical Journal. 808 (2): 126. arXiv:1505.02814. Bibcode:2015ApJ...808..126V. doi:10.1088/0004-637X/808/2/126. S2CID 14405731.
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