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KOI-4878.01

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KOI-4878.01
Artist's impression of KOI-4878.01
Discovery
Discovery siteKepler space telescope
Discovery date2015
Transit
Orbital characteristics
1.1392+0.0265
−0.0268[1] AU
Eccentricity0[2]
449.015±0.021[2] days
Inclination89.95[2] °
StarKOI-4878
Physical characteristics
1.02+0.04
−0.13 R🜨[1]
Temperature257 K (−16 °C; 3 °F)[3]

KOI-4878.01 is an exoplanet candidate that orbits the G-type main-sequence star KOI-4878. It is 1,120 light-years (344 pc) distant from Earth.[2] The features of the planet are very similar to that of Earth, and if it is confirmed, it would be one of the most Earth-like planets found. The orbital period of the exoplanet is around 449 days. It is located within the habitable zone of its parent star – a region where water can exist at liquid state.[3]

Host star

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KOI-4878 is a G-type main-sequence star, more precisely of spectral class G4V.[4] It has an apparent magnitude of 12.37[2] and in the constellation Draco.[5] The star has a mass of 1.009±0.129 M☉, a radius of 1.131±0.059 R☉ and an effective temperature of 5674±125 K.[6] Its age is estimated at 6.1±2.5 billion years, older than the Solar System.[3] Despite the unknown age of the star, its low metallicity and fairly high space velocity suggest that KOI-4878 is older than the Sun.[7][8]

Exoplanet detection

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An analysis of the Kepler space telescope's data from its first to the twelve quarter revealed three possible transit events equally spaced in time. A post-analysis in the Sixteen quarter showed that the events happened within a period of 449 days, they had a duration of 12 and half hours and a transit depth of 94 ppm.[9]

Characteristics

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KOI-4878.01 has a slightly larger radius than Earth: 1.02 Earth radii.[1] Its mass has not been measured, and is estimated to be somewhere between 0.4 - 3.0 Earth masses; likely about 0.99 Earth masses.[10][11] The planet has an equilibrium temperature of 257 K (−16 °C; 3 °F), compared to the 255 K (−18 °C; −1 °F) of Earth.[3]

The host star's age of 6.1±2.5 billion years suggest the planet had more time for life to evolve than Earth did. As of such, some astronomers speculate that it may be more suitable for intelligent life than Earth.[3]

Properties of KOI-4878.01[12]
Property Based on KIC data Based on new data
Period (days) 449.015±0.021 449.015±0.021
Semimajor Axis (AU) 1.137 +0.053/-0.040 1.125
Planet Radius (Earth=1) 1.04 +0.38/-0.14 1.05
Seff (Earth=1) 1.05 0.92

Habitability

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The estimated features of the planet are similar to an Earth analog.[13] It completes an orbit around its host star every 449 Earth days. Based on this, KOI-4878.01 should be in the habitable zone of the star.[14][15]

See also

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References

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  1. ^ a b c Berger, Travis A.; Huber, Daniel; Gaidos, Eric; van Saders, Jennifer L.; Weiss, Lauren M. (September 2020). "The Gaia-Kepler Stellar Properties Catalog. II. Planet Radius Demographics as a Function of Stellar Mass and Age". The Astronomical Journal. 160 (3): 108. arXiv:2005.14671. Bibcode:2020AJ....160..108B. doi:10.3847/1538-3881/aba18a. ISSN 0004-6256.
  2. ^ a b c d e "KOI-4878 Overview". NASA Exoplanet Archive.
  3. ^ a b c d e Chawda, Aryan; Guinan, Edward; Engle, Scott (February 2024). "A Better Earth? The Age and X-UV Irradiance of the Superhabitable Earth-Like Exoplanet, KOI-4878.01". American Astronomical Society Meeting Abstracts. 243: 178.03. Bibcode:2024AAS...24317803C.
  4. ^ Frasca, A.; Molenda-Żakowicz, J.; De Cat, P.; Catanzaro, G.; Fu, J. N.; Ren, A. B.; Luo, A. L.; Shi, J. R.; Wu, Y.; Zhang, H. T. (October 2016). "Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra". Astronomy and Astrophysics. 594: A39. arXiv:1606.09149. Bibcode:2016A&A...594A..39F. doi:10.1051/0004-6361/201628337. ISSN 0004-6361.
  5. ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  6. ^ Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; De Lee, Nathan; Collins, Kevin; Latham, David W.; Muirhead, Philip S.; Chittidi, Jay; Rojas-Ayala, Bárbara; Fleming, Scott W.; Rose, Mark E.; Tenenbaum, Peter; Ting, Eric B. (2019-10-01). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. KOI-4878's database entry at VizieR.
  7. ^ "KOI-4878". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-09-30.
  8. ^ Institute, CSIC. "Exoplanets in the Milky Way" (PDF).
  9. ^ "KOI-4878.01: Kepler's Most Earth-like Planet Candidate?". Drew Ex Machina. 2019-09-05. Retrieved 2020-10-01.
  10. ^ How the Universe Works: An Illustrated Guide to the Cosmos. Book Sales. 2017. ISBN 9780785835417.
  11. ^ Institute, CSIC. "Exoplanets in the Milky Way" (PDF).
  12. ^ "KOI-4878.01: Kepler's Most Earth-like Planet Candidate?". Drew Ex Machina. 2019-09-05. Retrieved 2020-10-01.
  13. ^ Atargatis (2020-11-10). "Found more than 20 exoplanets that could host life". Atargatis.news (in Italian). Retrieved 2020-11-12.
  14. ^ Mendez, Abel. Potentially habitable worlds.
  15. ^ "Planetas habitables en los que nunca habitaremos". El Independiente (in Spanish). 2016-10-07. Retrieved 2020-10-04.


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