Kepler-1638

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Kepler-1638
Cygnus constellation map.svg
Constellation where Kepler-1638 is located
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Cygnus [1]
Right ascension 19h 41m 55.76712s [2]
Declination +48° 31′ 27.9998″ [2]
Apparent magnitude  (V)14.769±0.206 [3]
Characteristics
Evolutionary stage subgiant [2]
Spectral type G [4]
Apparent magnitude  (J)13.550±0.023 [5]
Apparent magnitude  (H)13.204±0.024 [5]
Apparent magnitude  (K)13.138±0.035 [5]
Variable type Planetary transit [3]
Astrometry
Proper motion (μ)RA: −5.092 mas/yr [2]
Dec.: +5.839 mas/yr [2]
Parallax (π)0.6462±0.0165  mas [2]
Distance 5,000 ± 100  ly
(1,550 ± 40  pc)
Details
Mass 1.03 [6]   M☉
Radius 1.62 [6]   R☉
Luminosity 2.59 [6]   L☉
Surface gravity (log g)4.03 [6]   cgs
Temperature 5,745 [6]   K
Metallicity [Fe/H]−0.76+0.32
−0.26 [7]   dex
Rotation 27.7 days [8]
Rotational velocity (v sin i)2.25 [9]  km/s
Age 5.7+5.1
−2.6 [7]   Gyr
Other designations
KOI-5856, KIC 11037818, 2MASS J19415577+4831280 [10]
Database references
SIMBAD data

Kepler-1638 is a G-type subgiant star located about 5,000 light years away in the constellation of Cygnus. [1] One known exoplanet has been found orbiting the star: Kepler-1638b. [11] [12] [13] [14] As of January 2021, Kepler-1638 is the farthest star with a known exoplanet orbiting in the habitable zone. [15]

Contents

Planetary system

The Kepler-1638 planetary system [3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b~4.16  M🜨 0.745+0.021
−0.020		259.33683±0.01303—89.9954+0.0021
−0.0844 ° 		1.87+0.33
−0.22  R🜨

Kepler-1638 b is an exoplanet in orbit of its star, Kepler-1638, located in the constellation Cygnus. It was confirmed in 2016 as part of a study statistically validating hundreds of Kepler planets. Based on the parameters in the discovery paper, the planet is a super-Earth, with a radius of 1.87+0.33
−0.22  R🜨 , and a predicted mass of 4.16 Earths. It has an orbit of 259.337±0.013 days in its system's habitable zone and orbits 0.745 AU from its star. It is the most distant known exoplanet that is considered potentially habitable. [3] [14] [11] [12] [13]

However, these parameters were estimated before the first measurement of the host star's parallax was published as part of Gaia DR2 in 2018. The Gaia parallax suggests a distance of about 1,548 parsecs (5,050 light-years ), [2] much farther than the pre-Gaia estimate of about 764 parsecs (2,490 light-years). [7] This revised distance results in a significantly larger estimate of the radius of the star, and thus of the planet, with a 2018 study finding a planetary radius of 3.226+0.201
−0.315  R🜨 . This would make the planet an ice giant like Neptune, and thus not potentially habitable in an Earth-like sense. [16] [3]

References

  1. 1 2 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.
  2. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 "Kepler-1638". NASA Exoplanet Archive . Retrieved 2 February 2021.
  4. ↑ Holczer, Tomer; Shporer, Avi; Mazeh, Tsevi; Fabrycky, Daniel; Nachmani, Gil; McQuillan, Amy; Sanchis-Ojeda, Roberto; Orosz, Jerome A.; Welsh, William F.; Ford, Eric B.; Jontof-Hutter, Daniel (2015). "Time Variation of Kepler Transits Induced by Stellar Spots—A Way to Distinguish between Prograde and Retrograde Motion. II. Application to KOIs". The Astrophysical Journal. 807 (2): 170. arXiv: 1504.04028 . Bibcode:2015ApJ...807..170H. doi:10.1088/0004-637X/807/2/170.
  5. 1 2 3 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". Vizier Online Data Catalog. Bibcode:2003yCat.2246....0C.
  6. 1 2 3 4 5 Stassun, Keivan G.; et al. (2019). "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 .
  7. 1 2 3 Torres, Guillermo; et al. (December 2017). "Validation of Small Kepler Transiting Planet Candidates in or near the Habitable Zone". The Astronomical Journal . 154 (6): 264. arXiv: 1711.01267 . Bibcode:2017AJ....154..264T. doi: 10.3847/1538-3881/aa984b . S2CID   73678176.
  8. ↑ Mazeh, Tsevi; Perets, Hagai B.; McQuillan, Amy; Goldstein, Eyal S. (2015). "Photometric Amplitude Distribution of Stellar Rotation of KOIs—Indication for Spin-Orbit Alignment of Cool Stars and High Obliquity for Hot Stars". The Astrophysical Journal. 801 (1): 3. arXiv: 1501.01288 . Bibcode:2015ApJ...801....3M. doi:10.1088/0004-637X/801/1/3.
  9. ↑ Abdurro'uf; et al. (2022). "The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar, and APOGEE-2 Data". The Astrophysical Journal Supplement Series. 259 (2): 35. arXiv: 2112.02026 . Bibcode:2022ApJS..259...35A. doi: 10.3847/1538-4365/ac4414 .
  10. ↑ "Kepler-1638". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2 February 2021.
  11. 1 2 Burgess, Matt (11 May 2016). "Nasa's Kepler telescope just found 1,284 exoplanets". Wired UK. ISSN   1357-0978 . Retrieved 22 January 2021.
  12. 1 2 "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 22 January 2021.
  13. 1 2 Mike Wall (11 May 2016). "1st Alien Earth Still Elusive Despite Huge Exoplanet Haul". Space.com. Retrieved 22 January 2021.
  14. 1 2 Morton, Timothy D.; Bryson, Stephen T.; Coughlin, Jeffrey L.; Rowe, Jason F.; Ravichandran, Ganesh; et al. (May 2016). "False Positive Probabilities for all Kepler Objects of Interest: 1284 Newly Validated Planets and 428 Likely False Positives". The Astrophysical Journal. 822 (2): 86. arXiv: 1605.02825 . Bibcode:2016ApJ...822...86M. doi: 10.3847/0004-637X/822/2/86 . S2CID   20832201.
  15. ↑ "The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo". phl.upr.edu. Retrieved 21 January 2021.
  16. ↑ Berger, Travis A.; Huber, Daniel; Gaidos, Eric; van Saders, Jennifer L. (October 2018). "Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2". The Astrophysical Journal . 866 (2): 99. arXiv: 1805.00231 . Bibcode:2018ApJ...866...99B. doi: 10.3847/1538-4357/aada83 .

See also

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