NSVS 14256825

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NSVS 14256825

A visual band light curve for NSVS 14256825, adapted from Almeida et al. (2012)[1]
Observation data
J2000
Constellation Aquila
Right ascension 20h 20m 00.45867s[2]
Declination +04° 37′ 56.5198″[2]
Apparent magnitude (V) 13.2[3]
Characteristics
Spectral type sdOB / M V[3]
Distance
2,700 ± 100 ly
(840 ± 40 pc)
Periastron epoch
(T)		2454274.20874 JD
Details[3]
Mass0.528 M☉
Temperature42,000 K
V1828 Aql, 2MASS J20200045+0437564[5]
Database references
SIMBADdata

NSVS 14256825, also known as V1828 Aquilae, is an

eclipsing binary system (of the Algol type) in the constellation of Aquila. The system comprises a subdwarf OB star and red dwarf star. The two stars orbit each other every 2.648976 hours.[1] Based on the stellar parallax of the system, observed by Gaia, the system is located approximately 2,700 light-years (840 parsecs) away.[2]

Nomenclature

The system is most commonly referred to using its designation from the Northern Sky Variability Survey (NSVS), a survey of stars with

variable star designation, V1828 Aquilae.[5]

Eclipse timing variations

NSVS 14256825 has been extremely well-studied using

eclipse timing variations (ETVs) that are significant, cyclic[7] and not explainable by other stellar mechanisms such as the Applegate mechanism.[9] In 2012, it was found that the orbit of NSVS 14256825 was increasing at a rate of 12×10−12 days per orbit.[10]

Initially, in 2012 it was claimed that two giant planets were in orbit around the binary, with masses of 2.9 and 8.1 times the mass of Jupiter orbiting with periods of 3.5 and 6.9 years respectively.[1] Another paper claimed the existence of one planet with a mass 12 times that of Jupiter, in a 20-year orbit.[11] However, subsequent studies have come up with different results with masses up to 15 MJ[9] and periods down to 8.83 years.[12] Studies also do not agree on whether one substellar body can explain the ETVs, or whether additional companions are necessary, but further research is needed to obtain better coverage of data.[13]

See also

References

  1. ^
    S2CID 119177743
    .
  2. ^
    doi:10.1051/0004-6361/201833051
    .
  3. ^ a b c "Notes on NSVS 1425 (AB) b". Extrasolar Planets Encyclopaedia. Retrieved 26 November 2016.
  4. S2CID 53724563
    .
  5. ^ a b "NSVS 14256825". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-16.
  6. S2CID 2974543
    .
  7. ^
    S2CID 54997940
    .
  8. doi:10.1093/mnras/stt2183
    .
  9. ^
    S2CID 118936443
    .
  10. hdl:10566/891
    .
  11. S2CID 119267859
    .
  12. S2CID 135471537
    .
  13. S2CID 231662494
    .
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