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Kepler-32

Coordinates: Sky map 19h 51m 22s, +46° 34′ 27″
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Kepler-32
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 51m 22.1742s[1]
Declination +46° 34′ 27.390″[1]
Apparent magnitude (V) 16.0[2]
Characteristics
Spectral type M1V[3]
Astrometry
Proper motion (μ) RA: −13.618±0.058[1] mas/yr
Dec.: 19.646±0.068[1] mas/yr
Parallax (π)3.0595 ± 0.0322 mas[1]
Distance1,070 ± 10 ly
(327 ± 3 pc)
Details
Mass0.58±0.05[2] M☉
Radius0.53±0.04[2] R☉
Surface gravity (log g)4.64[3] cgs
Temperature3900±200[2] K
Metallicity [Fe/H]0.00 dex
Rotation36.220±0.256 days[4]
Other designations
KIC 9787239, KOI-952, 2MASS J19512217+4634273[3]
Database references
SIMBADdata
KICdata

Kepler-32 is an M-type main sequence star located about 1070 light years from Earth, in the constellation of Cygnus. Discovered in January 2012 by the Kepler spacecraft,[5] it shows a 0.58 ± 0.05 solar mass (M☉), a 0.53 ± 0.04 solar radius (R☉), and temperature of 3900.0 K, making it half the mass and radius of the Sun, two-thirds its temperature and 5% its luminosity.[6] It initially was known to have at least 2 planets orbiting around it, the smaller Kepler-32b, orbiting its parent star every 5.90124 days, and Kepler-32c with an orbital period of 8.7522 days.[7] In April 2013, transit-timing variation analysis confirmed 3 other planets to be in the system. However, only very loose constraints of the maximum mass of the planets could be determined.[8]

Planetary system

In 2014, the dynamical simulation shown what the Kepler-32 planetary system have likely to undergone a substantial inward migration in the past, producing an observed pattern of lower-mass planets on tightest orbits.[9]

The Kepler-32 planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
f — 0.013 0.742956 — — 0.81±0.05 R🜨
e — 0.033 2.896009 — — 1.5±0.1 R🜨
b < 4.1 MJ 0.05 5.90124 — — 2.2±0.2 R🜨
c < 0.5 MJ 0.09 8.7522 — — 2.0±0.2 R🜨
d — 0.129 22.780806 — — 2.7±0.1 R🜨

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d "Notes on Kepler-32 b". Retrieved 21 January 2017.
  3. ^ a b c "KOI-952". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 January 2017.
  4. ^ McQuillan, A.; Mazeh, T.; Aigrain, S. (2013). "Stellar Rotation Periods of The Kepler objects of Interest: A Dearth of Close-In Planets Around Fast Rotators". The Astrophysical Journal Letters. 775 (1). L11. arXiv:1308.1845. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11.
  5. ^ NBC. "100 billion alien planets fill our galaxy: study". NBC News. Retrieved 28 February 2013.
  6. ^ Swift, Jonathan J. (2012). "Characterizing the Cool KOIs IV: Kepler-32 as a prototype for the formation of compact planetary systems throughout the Galaxy". The Astrophysical Journal. 764: 105. arXiv:1301.0023. Bibcode:2013ApJ...764..105S. doi:10.1088/0004-637X/764/1/105.
  7. ^ The Extrasolar Planet Encyclopedia. "Kepler-32". Exoplanet.eu. Archived from the original on 3 February 2014. Retrieved 28 February 2013.
  8. ^ Fabrycky, Daniel C.; et al. (2012). "Transit Timing Observations from Kepler: IV. Confirmation of 4 Multiple Planet Systems by Simple Physical Models". The Astrophysical Journal. 750 (2): 114. arXiv:1201.5415. Bibcode:2012ApJ...750..114F. doi:10.1088/0004-637X/750/2/114.
  9. ^ T. O. Hands, R. D. Alexander, W. Dehnen, "Understanding the assembly of Kepler's compact planetary systems", 2014
  10. ^ NASA Exoplanet Archive--Planet Host Overview page:Kepler-32

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