Kepler-89

Kepler-89
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 49m 19.9345s[1]
Declination +41° 53′ 28.0059″[1]
Apparent magnitude (V) 12.4[2]
Characteristics
Spectral type F8 V
Astrometry
Proper motion (μ) RA: 1.966±0.038 mas/yr
Dec.: 1.365±0.044 mas/yr
Parallax (π)2.0676 ± 0.0216[1] mas
Distance1,580 ± 20 ly
(484 ± 5 pc)
Details[3]
Mass1.25+0.03
−0.04 M☉
Radius1.61+0.11
−0.12 R☉
Surface gravity (log g)4.123 ± 0.055 cgs
Temperature6116 K
Metallicity [Fe/H]−0.01 ± 0.04 dex
Rotational velocity (v sin i)7.33 ± 0.32 km/s
Age3.9+0.3
−0.2 Gyr
Other designations
KOI-94, KIC 6462863, 2MASS J19491993+4153280
Database references
SIMBADdata
KICdata

Kepler-89 is a star with four confirmed planets. Kepler-89 is a possible wide binary star.[4]

Planetary system

The discovery of four planets orbiting the star was announced October 2012 by analyzing data gathered by Kepler space telescope.[5] Follow-up radial velocity measurements confirmed the existence of Kepler-89d, indicating that Kepler-89d is slightly larger and more massive than Saturn.[6] 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.[7]

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.[8][5] This allowed to determine the mutual inclination of the planets d and e to be 1.15°.[7]

The Kepler-89 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b <10.5 M⊕ 0.05 3.7 — 89.3° 0.13 RJ
c 7.3-11.8 M⊕ 0.099 10.4 <0.1 88.36° 0.31 RJ
d 0.33±0.034 MJ 0.165 22.3 <0.1 89.871° 0.83 RJ
e 11.9-15.5 M⊕ 0.298 54.3 <0.1 89.76° 0.49 RJ

References

  1. 1 2 3 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. ↑ "Planet Kepler-89 b". Extrasolar Planets Encyclopaedia. Retrieved 26 April 2018.
  3. ↑ Hirano, Teruyuki; Narita, Norio; Sato, Bun'ei; Takahashi, Yasuhiro H; Masuda, Kento; Takeda, Yoichi; Aoki, Wako; Tamura, Motohide; Suto, Yasushi (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.
  4. ↑ 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 [EP astro-ph. EP].
  5. 1 2 Teruyuki Hirano; Norio Narita; Bun'ei Sato; Takahashi, Yasuhiro H.; 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 [astro-ph.EP]. Bibcode:2012ApJ...759L..36H. doi:10.1088/2041-8205/759/2/L36. Cite uses deprecated parameter |class= (help)
  6. ↑ Weiss, Lauren M.; Marcy, Geoffrey W.; Rowe, Jason F.; Howard, Andrew W.; Isaacson, Howard; Fortney, Jonathan J.; Miller, Neil; Demory, Brice-Olivier; Fischer, Debra A.; Adams, Elisabeth R.; Dupree, Andrea K.; Howell, Steve B.; Kolbl, Rea; Johnson, John Asher; Horch, Elliott P.; Everett, Mark E.; Fabrycky, Daniel C.; Seager, Sara (2013). "The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux". The Astrophysical Journal. 768: 14. arXiv:1303.2150. Bibcode:2013ApJ...768...14W. doi:10.1088/0004-637X/768/1/14.
  7. 1 2 Masuda, Kento; Hirano, Teruyuki; Taruya, Atsushi; Nagasawa, Makiko; Suto, Yasushi (2013). "Characterization of the KOI-94 System with Transit Timing Variation Analysis: Implication for the Planet-Planet Eclipse". The Astrophysical Journal. 778 (2): 185–200. arXiv:1310.5771. Bibcode:2013ApJ...778..185M. doi:10.1088/0004-637X/778/2/185.
  8. ↑ "First ever discovery of planet-planet eclipse | UTokyo Research". u-tokyo.ac.jp. Retrieved 2014-01-20.
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