Astronomy:Kepler-33

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Short description: Star in the constellation Cygnus
Kepler-33
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  19h 16m 18.6100s[1]
Declination +46° 00′ 18.814″[1]
Apparent magnitude (V) 13.988
Characteristics
Spectral type G1IV
Astrometry
Radial velocity (Rv)12.18±3.65[1] km/s
Proper motion (μ) RA: −1.107(15)[1] mas/yr
Dec.: −13.099(14)[1] mas/yr
Parallax (π)0.8136 ± 0.0118[1] mas
Distance4,010 ± 60 ly
(1,230 ± 20 pc)
Details[2]
Mass1.26+0.03
−0.06
 M
Radius1.66±0.03 R
Luminosity3.1+0.2
−0.1
 L
Temperature5947±60 K
Metallicity [Fe/H]0.14±0.04 dex
Age4.2+1.3
−0.3
 Gyr
Other designations
KOI-707, KIC 9458613, 2MASS J19161861+4600187, Gaia DR2 2127355923723254272[3]
Database references
SIMBADdata

Kepler-33 is a star about 4,000 light-years (1,200 parsecs) in the constellation of Cygnus, with a system of five known planets. Having just begun to evolve off from the main sequence,[4] its radius and mass are difficult to ascertain, although data available in 2020 shows its best-fit mass of 1.3M and radius of 1.6R are compatible with a model of a subgiant star.[5]

Planetary system

The first detections of the candidate four-body planetary system were reported in February 2011.[6] On January 26, 2012, the planetary system around the star was confirmed, including a fifth planet.[4] However, unlike some other planets confirmed via Kepler, their masses were initially not known, as Doppler spectroscopy measurements were not done before the announcement. Judging by their radii, b may be a large super-Earth or small hot Neptune while the other four are all likely to be the latter. (As of 2022), the masses of planets e & f have been measured, with upper limits on the masses of planets c & d. These mass measurements confirm Kepler-33 d, e & f to be low-density, gaseous planets.[2]

Planets b and c may actually be in a 7:3 resonance, as there is a 0.05 day discrepancy; there is also a small 0.18 day discrepancy between a 5:3 resonance between planets c and d. The other planets do not seem to be in any resonances, though near resonances are 3d:2e and 4e:3f.

The planetary system in its current configuration is highly susceptible to perturbations, therefore assuming stability, no additional giant planets can be located within 30 AU from the parent star.[7]

The Kepler-33 planetary system[2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.0673+0.0004
−0.0012
5.66816±0.00005 <0.2 >87.0° 1.54+0.06
−0.05
 R
c <19 M 0.1181+0.0008
−0.0020
13.17552±0.00005 <0.05 >88.6° 2.73±0.06 R
d <8.2 M 0.165+0.001
−0.003
21.77574+0.00006
−0.00004
<0.03 >89.02° 4.67±0.09 R
e 6.6+1.1
−1.0
 M
0.212+0.001
−0.004
31.7852±0.0002 <0.02 89.4±0.1° 3.54+0.09
−0.07
 R
f 8.2+1.6
−1.2
 M
0.252+0.002
−0.004
41.0274±0.0002 <0.02 89.7+0.2
−0.1
°
3.96+0.09
−0.07
 R

See also

References

  1. 1.0 1.1 1.2 1.3 1.4 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.
  2. 2.0 2.1 2.2 Sikora, James et al. (December 2022). "Refining the Masses and Radii of the Star Kepler-33 and its Five Transiting Planets". The Astronomical Journal 164 (6): 242. doi:10.3847/1538-3881/ac98c4. Bibcode2022AJ....164..242S. 
  3. "Notes for star Kepler-33". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/star.php?st=Kepler-33. 
  4. 4.0 4.1 Lissauer, Jack J.; Marcy, Geoffrey W.; Rowe, Jason F.; Bryson, Stephen T.; Adams, Elisabeth; Buchhave, Lars A.; Ciardi, David R.; Cochran, William D. et al. (10 May 2012). "Almost All of Kepler's Multiple Planet Candidates are Planets". The Astrophysical Journal 750 (2): 112. doi:10.1088/0004-637X/750/2/112. Bibcode2012ApJ...750..112L. 
  5. Berger, Travis A.; Huber, Daniel; van Saders, Jennifer L.; Gaidos, Eric; Tayar, Jamie; Kraus, Adam L. (2020), "The Gaia-Kepler Stellar Properties Catalog. I. Homogeneous Fundamental Properties for 186,301 Kepler Stars", The Astronomical Journal 159 (6): 280, doi:10.3847/1538-3881/159/6/280, Bibcode2020AJ....159..280B 
  6. Ford, Eric B.; Rowe, Jason F.; Fabrycky, Daniel C.; Carter, Joshua A.; Holman, Matthew J.; Lissauer, Jack J.; Ragozzine, Darin; Steffen, Jason H. et al. (2011), "Transit Timing Observations from Kepler : I. Statistical Analysis of the First Four Months", The Astrophysical Journal Supplement Series 197 (1): 2, doi:10.1088/0067-0049/197/1/2, Bibcode2011ApJS..197....2F 
  7. Becker, Juliette C.; Adams, Fred C. (2017), "Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems", Monthly Notices of the Royal Astronomical Society 468 (1): 549–563, doi:10.1093/mnras/stx461, Bibcode2017MNRAS.468..549B 

Coordinates: Sky map 19h 16m 18.61s, +46° 00′ 18.8″