2MASS J19383260+4603591

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]

2MASS J19383260+4603591
Observation data
Epoch J2000      Equinox J2000
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 mas/yr[2]
Dec.: -4.40±0.04 mas/yr[2]
Parallax (π)2.4400 ± 0.0316 mas[2]
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

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 2MASS J19383260+4603591 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. "2MASS J19383260+4603591 b/Kepler-451 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-09.
  2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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, arXiv:2009.02749, doi:10.1051/0004-6361/202038121, S2CID 221516872
  4. "2MASS J19383260+4603591 system". Open Exoplanet Catalog. Retrieved 2015-10-09.
  5. "Kepler-451". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-09.
  6. Detection of a planet in the sdB + M dwarf binary system 2M 1938+4603
  7. 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, arXiv:2202.02118, doi:10.1093/mnras/stac357
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