Kepler-89

Last updated
Kepler-89
Observation data
Epoch J2000       Equinox J2000
Constellation Cygnus [1]
Right ascension 19h 49m 19.9343s [2]
Declination +41° 53′ 28.006″ [2]
Apparent magnitude  (V)12.4 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type F8 IV-V
Astrometry
Proper motion (μ)RA: 2.063(10) mas/yr [2]
Dec.: 1.337(11) mas/yr [2]
Parallax (π)2.1069±0.0086  mas [2]
Distance 1,548 ± 6  ly
(475 ± 2  pc)
Details [4]
Mass 1.25+0.03
−0.04  M☉
Radius 1.61+0.11
−0.12  R☉
Surface gravity (log g)4.123±0.055  cgs
Temperature 6,116  K
Metallicity [Fe/H]−0.01±0.04  dex
Rotational velocity (v sin i)7.33±0.32 km/s
Age 3.9+0.3
−0.2  Gyr
Other designations
Gaia DR2 2076970047474270208, KOI-94, KIC 6462863, 2MASS J19491993+4153280 [5]
Database references
SIMBAD data
KIC data

Kepler-89 is a star with four confirmed planets. Kepler-89 is a possible wide binary star. [6]

Planetary system

The discovery of four planets orbiting the star was announced October 2012 by analyzing data gathered by Kepler space telescope. [4] Follow-up radial velocity measurements confirmed the existence of Kepler-89d, indicating that Kepler-89d is slightly larger and more massive than Saturn. [7] In October 2013, other three planets were confirmed with Kepler-89c and Kepler-89e getting reasonable mass constraints. Transit-timing variations of the outermost planet suggest that additional planets or minor bodies are present in the system. [8]

In 2012, a partial transit of the second outermost planet by the outermost planet was reported. This was the first time a planet-planet transit in front of the star was detected. [9] [4] This allowed to determine the mutual inclination of the planets d and e to be 1.15°. [8]

Stephen R. Kane did a dynamical analysis of the Kepler-89 system that demonstrated that planets c and d, although close to the 2:1 secular resonance, are not permanently in a 2:1 resonance configuration. [10]

The Kepler-89 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b <10.5  M🜨 0.053.7—89.3° 0.13  RJ
c 7.3-11.8  M🜨 0.09910.4<0.188.36° 0.31  RJ
d 0.33±0.034  MJ 0.16522.3<0.189.871° 0.83  RJ
e 11.9-15.5  M🜨 0.29854.3<0.189.76° 0.49  RJ

References

  1. ↑ 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 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. ↑ "Planet Kepler-89 b". Extrasolar Planets Encyclopaedia . Retrieved 26 April 2018.
  4. 1 2 3 Hirano, Teruyuki; et al. (2012). "Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry". The Astrophysical Journal. 759 (2). L36. arXiv: 1209.4362 . Bibcode: 2012ApJ...759L..36H . doi: 10.1088/2041-8205/759/2/L36 .
  5. ↑ "Kepler-89". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-08-07.
  6. ↑ Takahashi, Yasuhiro H.; Norio Narita; Teruyuki Hirano; Masayuki Kuzuhara; et al. (2013). "A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive". arXiv: 1309.2559 [astro-ph.EP].
  7. ↑ Weiss, Lauren M.; et al. (2013). "The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux". The Astrophysical Journal. 768 (1). 14. arXiv: 1303.2150 . Bibcode: 2013ApJ...768...14W . doi: 10.1088/0004-637X/768/1/14 .
  8. 1 2 Masuda, Kento; et al. (2013). "Characterization of the KOI-94 System with Transit Timing Variation Analysis: Implication for the Planet-Planet Eclipse". The Astrophysical Journal. 778 (2). 185. arXiv: 1310.5771 . Bibcode: 2013ApJ...778..185M . doi: 10.1088/0004-637X/778/2/185 .
  9. ↑ "First ever discovery of planet-planet eclipse | UTokyo Research". u-tokyo.ac.jp. Archived from the original on 2013-11-04. Retrieved 2014-01-20.
  10. ↑ Kane, Stephen R. (2019). "Orbital Stability and Precession Effects in the Kepler-89 System". The Astronomical Journal. 158 (2). 72. arXiv: 1906.07193 . Bibcode: 2019AJ....158...72K . doi: 10.3847/1538-3881/ab2a09 .
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