Astronomy:2M 1938+4603

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Short description: Binary star system in the constellation Cygnus
2MASS J19383260+4603591
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  19h 38m 32.61s[1]
Declination  46h 03m 59.1s[1]
Characteristics
Spectral type sdBV/M
Astrometry
Proper motion (μ) RA: 5.23±0.04[2] mas/yr
Dec.: -4.40±0.04[2] mas/yr
Parallax (π)2.4400 ± 0.0316[2] mas
Distance1,340 ± 20 ly
(410 ± 5 pc)
Orbit[3]
Period (P)0.12576528 d
Details
Kepler-451 A
Mass0.48±0.03[1] [4] M☉
Radius0.223±0.004/0.158±0.003[1] [4] R☉
Temperature29564±106[1][4] K
Age6±2 Gyr
Kepler-451 B
Mass0.120±0.010 M☉
Other designations
Kepler-451, KIC 9472174, 2MASS J19383260+4603591[5]
Database references
SIMBADdata

2MASS J19383260+4603591 (commonly abbreviated to 2M J1938+4603, also known as Kepler-451) is a binary star system with at least one known planet, Kepler-451b. The system comprises two stars, a pulsating subdwarf B star as well as a small red dwarf star.[3]

Planetary system

It has at least one confirmed exoplanet, Kepler-451b, discovered in 2015[6] by the Kepler spacecraft. The discovery was disputed in 2020,[3] but in 2022 confirmation of Kepler-451b and the discovery of two additional planets was announced.[7]

The 2M 1938+4603 planetary system[7]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
d 1.76±0.18 MJ 0.20±0.03 43.0±0.1 0 — —
b 1.86±0.05 MJ 0.90±0.04 406±4 0.33±0.05 <43[3]° —
c 1.61±0.14 MJ 2.1±0.2 1460±90 0.29±0.07 — —

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "2MASS J19383260+4603591 b/Kepler-451 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-451+b&type=CONFIRMED_PLANET. 
  2. ↑ 2.0 2.1 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 Krzesinski, J.; Blokesz, A.; Siwak, M.; Stachowski, G. (2020), "The quest for planets around subdwarfs and white dwarfs from Kepler space telescope fields", Astronomy & Astrophysics 642: A105, doi:10.1051/0004-6361/202038121 
  4. ↑ 4.0 4.1 4.2 "2MASS J19383260+4603591 system". Open Exoplanet Catalog. http://www.openexoplanetcatalogue.com/planet/2M%201938%2B4603%20b/. 
  5. ↑ "Kepler-451". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-451. 
  6. ↑ Detection of a planet in the sdB + M dwarf binary system 2M 1938+4603
  7. ↑ 7.0 7.1 Ekrem Murat Esmer; Baştürk, Özgür; Selim Osman Selam; Aliş, Sinan (2022), "Detection of two additional circumbinary planets around Kepler-451", Monthly Notices of the Royal Astronomical Society 511 (4): 5207–5216, doi:10.1093/mnras/stac357 




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