Astronomy:Kepler-88

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Short description: Sun-like star in the constellation Lyra
Kepler-88
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lyra
Right ascension  +19h 24m 35.5431s[1]
Declination +40° 40′ 09.8098″[1]
Apparent magnitude (V) 13.5[2]
Characteristics
Spectral type G8IV or B[3]
Astrometry
Proper motion (μ) RA: 1.114±0.023[1] mas/yr
Dec.: 4.963±0.028[1] mas/yr
Parallax (π)2.6246 ± 0.0140[1] mas
Distance1,243 ± 7 ly
(381 ± 2 pc)
Absolute magnitude (MV)5.183+0.116
−0.090
[4]
Details
Mass1.022+0.023
−0.026
[4] M
Radius0.961+0.020
−0.024
[4] R
Luminosity0.755+0.056
−0.067
[4] L
Surface gravity (log g)4.482+0.018
−0.016
[4] cgs
Temperature5513±67[4] K
Metallicity [Fe/H]+0.37 ± 0.08[4] dex
Rotation30.689±0.383 days[5]
Age2.45+1.20
−0.77
[4] Gyr
Other designations
KOI-142, KIC 5446285, 2MASS J19243554+4040098, Gaia DR2 2101507367429089664[6]
Database references
SIMBADdata
KICdata

Kepler-88 is a Sun-like star in the constellation of Lyra, with three confirmed planets. In April 2012, scientists discovered that a Kepler candidate known as KOI-142.01 (Kepler-88b) exhibited very significant transit-timing variations caused by a non-transiting planet.[4] Timing variations were large enough to cause changes to transit durations to Kepler-88b as well. Large transit-timing variations helped to put tight constraints to masses of both planets. The non-transiting planet was further confirmed through the radial velocity method in November 2013.[7]

Planetary system

Kepler-88b is the innermost planet in the system and is Neptune-sized but almost half as dense.

Kepler 88c is about 60% as massive as Jupiter, but its radius is not known due to not transiting the planet.

Kepler-88d orbits its star every four years, and its orbit is not circular, but elliptical. At three times the mass of Jupiter, it is the most massive.[8] It was discovered based on six years of radial velocity (RV) follow-up from the W. M. Keck Observatory High Resolution Echelle Spectrometer spectrograph.[9]

The Kepler-88 planetary system[9]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.09604+0.00063−0.00066 MJ 0.098 10.91647±0.00014 0.05561±0.00013 90.97±0.12° 3.780 R
c 0.656+0.027−0.026 MJ 0.15525 22.26492±0.00067 0.05724±0.00045 93.15±0.68°
d ≥3.15±0.15 MJ 2.45±0.02 1409+14−13 0.424+0.031−0.032

References

  1. 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. "Notes on Kepler-88 b". Extrasolar Planets Encyclopaedia. http://exoplanet.eu/catalog/kepler-88_b/. 
  3. "Kepler-88". http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Kepler-88. 
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Nesvorný, David; Kipping, David; Terrell, Dirk; Hartman, Joel; Bakos, Gáspár Á; Buchhave, Lars A (2013). "KOI-142, the King of Transit Variations, is a Pair of Planets Near the 2:1 Resonance". The Astrophysical Journal 777 (1): 3. doi:10.1088/0004-637X/777/1/3. Bibcode2013ApJ...777....3N. 
  5. 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. doi:10.1088/2041-8205/775/1/L11. Bibcode2013ApJ...775L..11M. 
  6. "Kepler-88". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-88. 
  7. SOPHIE velocimetry of kepler transit candidates:X KOI-142c: first radial velocity confirmation of a non-transiting exoplanet discovered by transit timing: S.C.C. Barros (1), R. F. Diaz, A. Santerne, G. Bruno, M. Deleuil, J.M. Almenara, A.S. Bonomo, F. Bouchy, C. Damiani, G. Hebrard, G. Montagnier, C. Moutou (1- Laboratoire d'astrophysique de Marseille)2
  8. "Newly discovered planetary system". COSPAR Information Bulletin 2002 (154): 8–9. August 2002. doi:10.1016/s0045-8732(02)80068-7. ISSN 0045-8732. Bibcode2002CIBu..154....8.. 
  9. 9.0 9.1 Weiss, Lauren M.; Fabrycky, Daniel C.; Agol, Eric; Mills, Sean M.; Howard, Andrew W.; Isaacson, Howard; Petigura, Erik A.; Fulton, Benjamin et al. (2020-04-29). "The Discovery of the Long-Period, Eccentric Planet Kepler-88 d and System Characterization with Radial Velocities and Photodynamical Analysis". The Astronomical Journal 159 (5): 242. doi:10.3847/1538-3881/ab88ca. ISSN 1538-3881. Bibcode2020AJ....159..242W. https://authors.library.caltech.edu/99954/1/1909.02427.pdf.