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2MASS J19383260+4603591
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 38m 32.612s[1]
Declination +46h 03m 59.14s[1]
Apparent magnitude (V) 12.69[2]
Characteristics
Spectral type sdBV+dM[3]
Astrometry
Proper motion (μ) RA: 5.225(37) mas/yr[1]
Dec.: −4.405(42) mas/yr[1]
Parallax (π)2.4410 ± 0.0316 mas[1]
Distance1,340 ± 20 ly
(410 ± 5 pc)
Orbit[4]
Period (P)0.125765282(5) d
Inclination (i)69.45±0.20°
Semi-amplitude (K1)
(primary)		65.7±0.6 km/s
Details
Kepler-451 A
Mass0.48±0.03[5] M☉
Radius0.203±0.001[6] R☉
Temperature29564±106[5] K
Age6±2[citation needed] Gyr
Kepler-451 B
Mass0.12±0.01[5] M☉
Radius0.168±0.001[6] R☉
Other designations
Kepler-451, KIC 9472174, TYC 3556-3568-1, 2MASS J19383260+4603591[2]
Database references
SIMBADdata

2MASS J19383260+4603591 (abbreviated to 2M1938+4603, also known as Kepler-451) is an eclipsing post-common envelope binary star system that comprises two stars, a pulsating subdwarf B star and a small red dwarf star.[5] It is located about 1,340 light-years (410 parsecs) away in the constellation Cygnus.[1] It has been hypothesized to host one or more exoplanets.[6]

Planetary system[edit]

Periodic variations in the timing of this system's eclipses were detected in 2015 using data from the Kepler space telescope. It was proposed that these variations are caused by the gravitational effects of a Jupiter-mass planet, Kepler-451b, orbiting with a period of 416 days at a distance of 0.92 AU.[4]

The existence of planets in this system is disputed. An independent study in 2020 found no evidence for Kepler-451b, ruling out the presence of any object of at least Jupiter's mass on the claimed orbit with an inclination greater than 43°.[3] A 2022 study instead proposed a three-planet model, including the originally claimed planet as well as two other planets of similar mass with orbital periods of 43 and 1,800 days.[6]

In general, eclipse timing variations of this type are common in post-common envelope binary systems, and their true cause remains uncertain.[7]

The 2MASS J19383260+4603591 planetary system[6]
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[edit]

  1. ^ a b c d e 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.
  2. ^ a b "Kepler-451". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-09.
  3. ^ a b c 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, Bibcode:2020A&A...642A.105K, doi:10.1051/0004-6361/202038121, S2CID 221516872
  4. ^ a b Baran, A. S.; Zola, S.; et al. (May 2015). "Detection of a planet in the sdB + M dwarf binary system 2M 1938+4603". Astronomy & Astrophysics. 577: A146. Bibcode:2015A&A...577A.146B. doi:10.1051/0004-6361/201425392.
  5. ^ a b c d Østensen, R. H.; Green, E. M.; et al. (October 2010). "2M1938+4603: a rich, multimode pulsating sdB star with an eclipsing dM companion observed with Kepler". Monthly Notices of the Royal Astronomical Society: Letters. 408 (1): L51–L55. arXiv:1006.4267. Bibcode:2010MNRAS.408L..51O. doi:10.1111/j.1745-3933.2010.00926.x.
  6. ^ a b c d e 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, Bibcode:2022MNRAS.511.5207E, doi:10.1093/mnras/stac357
  7. ^ Pulley, D.; Sharp, I. D.; Mallett, J.; von Harrach, S. (August 2022). "Eclipse timing variations in post-common envelope binaries: Are they a reliable indicator of circumbinary companions?". Monthly Notices of the Royal Astronomical Society. 514 (4): 5725–5738. arXiv:2206.06919. Bibcode:2022MNRAS.514.5725P. doi:10.1093/mnras/stac1676.
source: https://en.wikipedia.org/wiki/2M_1938%2B4603

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