Astronomy:Kepler-37d

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Short description: Super-Earth orbiting Kepler-37
Kepler-37d
Discovery[1]
Discovery siteKepler space telescope
Discovery date2013
Transit
Orbital characteristics[2]
0.2109±0.0030 astronomical unit|AU
Eccentricity<0.10
Orbital period39.7922622(65) d
Inclination89.335°+0.043°
−0.047°
StarKepler-37
Physical characteristics[2]
Mean radius2.030+0.030
−0.039 R⊕
Mass5.4±1.4 M⊕[3] or <2.0 M⊕[2]
Mean density4.29+0.52
−0.74 g/cm3[3] or <1.3 g/cm3[2]
Physics499±7 K (226 °C; 439 °F, equilibrium)


Kepler-37d is an exoplanet discovered by the Kepler space telescope in February 2013.[4] It is located 209 light years away,[5] in the constellation Lyra.[4] With an orbital period of 39.8 days,[3] it is the largest of the three known planets orbiting its parent star Kepler-37.[6]

A 2021 study detected Kepler-37d via radial velocity, finding a mass of about 5.4 M⊕,[3] but a 2023 study instead found an upper limit on its mass of only 2 M⊕.[2] In either case, it is not a rocky planet, but a low-density planet rich in volatiles.

In 2015, a grant was approved to further expand the Sagan Planet Walk by installing a Kepler-37d station on the Moon 384,500 kilometers (238,900 mi) away.[7][8]

Host star

Main page: Astronomy:Kepler-37

The planet orbits a (G-type) star similar to the Sun, named Kepler-37, orbited by a total of four planets. The star has a mass of 0.80 M☉ and a radius of 0.79 R☉. It has a temperature of 5417 K and is 5.66 billion years old. In comparison, the Sun is 4.6 billion years old,[9] and has a temperature of 5778 K.[10]

The star's apparent magnitude, or how bright it appears from Earth's perspective, is 9.71. Therefore, it is too dim to be seen with the naked eye.

See also

  • List of planets discovered by the Kepler spacecraft

References

  1. ↑ Barclay, T.; Rowe, J. F.; Lissauer, J. J.; Huber, D.; Fressin, F.; Howell, S. B.; Bryson, S. T.; Chaplin, W. J. et al. (2013-02-20). "A sub-Mercury-sized exoplanet". Nature 494 (7438): 452–4. doi:10.1038/nature11914. ISSN 0028-0836. PMID 23426260. Bibcode: 2013Natur.494..452B. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Bonomo, A. S. et al. (April 2023). "Cold Jupiters and improved masses in 38 Kepler and K2 small-planet systems from 3661 high-precision HARPS-N radial velocities. No excess of cold Jupiters in small-planet systems". Astronomy & Astrophysics. doi:10.1051/0004-6361/202346211. 
  3. ↑ 3.0 3.1 3.2 3.3 Rajpaul, V. M.; Buchhave, L. A.; Lacedelli, G.; Rice, K.; Mortier, A.; Malavolta, L.; Aigrain, S.; Borsato, L. et al. (2021), "A HARPS-N mass for the elusive Kepler-37d: A case study in disentangling stellar activity and planetary signals", Monthly Notices of the Royal Astronomical Society 507 (2): 1847–1868, doi:10.1093/mnras/stab2192 
  4. ↑ 4.0 4.1 Black, Charles. "NASA's Kepler discovers small planet system". SEN TV LIMITED. http://www.sen.com/news/nasa-s-kepler-discovers-small-planet-system.html. 
  5. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  6. ↑ Harwood, William. "Kepler telescope spots smallest exoplanet yet". Spaceflight Now Inc. http://spaceflightnow.com/news/n1302/21kepler/. 
  7. ↑ "Tompkins County Strategic Tourism Planning Board". April 15, 2015. http://www.tompkinscountyny.gov/files/tourism/4_15_15_STPB_agenda_PACKET_full.pdf. 
  8. ↑ "Kepler-37d". http://saganplanetwalk.wixsite.com/home/kepler-37d. 
  9. ↑ Fraser Cain (16 September 2008). "How Old is the Sun?". Universe Today. http://www.universetoday.com/18237/how-old-is-the-sun/. 
  10. ↑ Fraser Cain (15 September 2008). "Temperature of the Sun". Universe Today. http://www.universetoday.com/18092/temperature-of-the-sun/. 



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