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'''K2-155d''' is an [[exoplanet]] in the [[K2-155]] system. It is probably a [[Terrestrial planet|rocky]] [[super-Earth]],<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/|publisher=[[CNET]]|date=March 13, 2018}}</ref> It is the outermost of three known planets orbiting K2-155, a bright [[red dwarf]] star.<ref name=PRNewswire/> It is one of the 15 exoplanets discovered by Japanese astronomer Teruyuki Hirano of the [[Tokyo Institute of Technology]].<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 evidence for its discovery comes from data gathered during the [[Kepler (spacecraft)#Second Light (K2)|extended mission of NASA's Kepler spacecraft]].<ref name=CNET/> Analyses show that it may fall within the habitable zone and may be able to support liquid water.<ref name=Newsweek/><ref name=CNET/>
'''K2-155d''' is an [[exoplanet]] in the [[K2-155]] system. It is probably a [[Terrestrial planet|rocky]] [[super-Earth]],<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/|publisher=[[CNET]]|date=March 13, 2018}}</ref> It is the outermost of three known planets orbiting K2-155, a bright [[red dwarf]] star.<ref name=PRNewswire/> It is one of the 15 exoplanets discovered by Japanese astronomer Teruyuki Hirano of the [[Tokyo Institute of Technology]].<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 evidence for its discovery comes from data gathered during the [[Kepler (spacecraft)#Second Light (K2)|extended mission]] of [[NASA]]'s [[Kepler (spacecraft)|Kepler spacecraft]].<ref name=CNET/> Analyses show that it may fall within the habitable zone and may be able to support 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/>
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/>


K2-155d has also been observed through numerous ground-based telescopes, including the [[Nordic Optical Telescope]] in Spain and the [[Subaru Telescope]] in [[Hawaii]].<ref name=CNET/> 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 has also been observed through numerous ground-based telescopes, including the Nordic Optical Telescope in Spain and the Subaru Telescope.<ref name=CNET/> 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 and 0.146 of [[Jupiter]].<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> Its radius lies halfway the similarities of small rocky planets and bigger gas-rich planets.<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 web|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|publisher=[[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 that of Earth.<ref name=Hirano_et_al_2018/> Its physical temperature is 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 and 0.146 of [[Jupiter]].<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> Its radius lies halfway the similarities of small rocky planets and bigger gas-rich planets.<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 web|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|publisher=[[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 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 one of three known planets in the system orbiting [[K2-155]], a red dwarf star located 200 light years from Earth.<ref name=PRNewswire/> Its parent star has 88% less volume than the Sun.<ref name=Exoplorer.org/> It 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|url=https://arxiv.org/abs/1505.02814|publisher=[[arXiv]]|date=May 11, 2015|arxiv=1505.02814}}</ref>
K2-155d is one of three known planets in the system orbiting [[K2-155]], a red dwarf star located 200 light years from Earth.<ref name=PRNewswire/> Its parent star has 88% less volume than the Sun.<ref name=Exoplorer.org/> 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|url=https://arxiv.org/abs/1505.02814|publisher=[[arXiv]]|date=May 11, 2015|arxiv=1505.02814}}</ref>


==Habitability potential==
==Habitability potential==

Revision as of 11:57, 7 May 2018

Size comparison
Earth K2-155d[1]
Exoplanet

Template:Planetbox begin Template:Planetbox star Template:Planetbox character Template:Planetbox orbit Template:Planetbox discovery Template:Planetbox end

K2-155d is an exoplanet in the K2-155 system. It is probably a rocky super-Earth,[2] It is the outermost of three known planets orbiting K2-155, a bright red dwarf star.[3] It is one of the 15 exoplanets discovered by Japanese astronomer Teruyuki Hirano of the Tokyo Institute of Technology.[4] The evidence for its discovery comes from data gathered during the extended mission of NASA's Kepler spacecraft.[2] Analyses show that it may fall within the habitable zone and may be able to support liquid water.[5][2]

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.[2] Its discovery is based on data from the K2 mission of NASA’s Kepler spacecraft.[2] 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.[2] Its characteristics were confirmed using speckle imaging and high-dispersion optical spectroscopy.[6] 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.[6]

K2-155d has also been observed through numerous ground-based telescopes, including the Nordic Optical Telescope in Spain and the Subaru Telescope.[2] The brightness of its host star makes K2-155d a good target for future studies using instruments such as the James Webb Space Telescope.[6]

Characteristics

K2-155d is a super-Earth exoplanet with a radius 1.64 times that of Earth and 0.146 of Jupiter.[1] Its radius lies halfway the similarities of small rocky planets and bigger gas-rich planets.[6][5] Climate models predict that it is located near its star's habitable zone and has an insolation 1.67 ± 0.38 that of Earth.[6] Its physical temperature is estimated to be 289 K, which is 16 degrees Celsius or 61 degrees Fahrenheit.[7] Studies have shown that the planet would maintain a moderate surface temperature if its insolation is smaller than ∼1.5 times that of Earth.[6]

K2-155d is one of three known planets in the system orbiting K2-155, a red dwarf star located 200 light years from Earth.[3] Its parent star has 88% less volume than the Sun.[8] 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.[2] K2-155d has an orbital radius of 0.1886 AU[1] and studies suggest that the planet has a low orbital eccentricity.[9]

Habitability potential

K2-155d has been labeled a potentially habitable planet that may be able to harbor liquid water.[5][2] A three-dimensional climate simulation was used to confirm the possibility of the existence of water.[2] However, its discoverer Teruyuki Hirano was cautious about the findings, stating that they do not guarantee K2-155d is habitable.[5] Factors such as the absence of solar flares could also decide if K2-155d is habitable.[2]

References

Wikinews has related news:
  1. ^ a b c "Confirmed Planet Overview Page: K2-155d". NASA Exoplanet Archive. 2018.
  2. ^ a b c d e f g h i j k Mack, Eric (March 13, 2018). "A super-Earth around a red star could be wet and wild". CNET.
  3. ^ a b Cite error: The named reference PRNewswire was invoked but never defined (see the help page).
  4. ^ "15 new planets confirmed around cool dwarf stars". Tokyo Tech News. March 12, 2018.
  5. ^ 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.
  6. ^ a b c d e f 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. 124.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  7. ^ Cite error: The named reference HEC was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Exoplorer.org was invoked but never defined (see the help page).
  9. ^ Eylen, Vincent; Albrecht, Simon (May 11, 2015). "Eccentricity from transit photometry: small planets in Kepler multi-planet systems have low eccentricities". arXiv. arXiv:1505.02814. {{cite journal}}: Cite journal requires |journal= (help)
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