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NSVS 14256825

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NSVS 14256825

Avisual bandlight curvefor NSVS 14256825, adapted from Almeidaet al.(2012)[1]
Observation data
EpochJ2000EquinoxJ2000
Constellation Aquila
Right ascension 20h20m00.45867s[2]
Declination +04° 37′ 56.5198″[2]
Apparent magnitude(V) 13.2[3]
Characteristics
Spectral type sdOB/ M V[3]
Astrometry
Radial velocity(Rv)12.10 ± 1.5[4]km/s
Proper motion(μ)RA:8.063[2]mas/yr
Dec.:1.133[2]mas/yr
Parallax(π)1.1929 ± 0.0599mas[2]
Distance2,700 ± 100ly
(840 ± 40pc)
Orbit[1]
Period(P)0.110374230 d
Inclination(i)82.5°
Periastronepoch(T)2454274.20874 JD
Details[3]
Mass0.528M☉
Temperature42,000K
Other designations
V1828 Aql,2MASSJ20200045+0437564[5]
Database references
SIMBADdata

NSVS 14256825,also known asV1828 Aquilae,is aneclipsing binarysystem (of theAlgol type) in theconstellationofAquila.The system comprises asubdwarf OBstar andred dwarfstar. The two stars orbit each other every 2.648976hours.[1]Based on thestellar parallaxof the system, observed byGaia,the system is located approximately 2,700 light-years (840 parsecs) away.[2]

Nomenclature

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The system is most commonly referred to using its designation from the Northern Sky Variability Survey (NSVS), a survey of stars withapparent magnitudesbetween 8 and 15.5.[6]It also has avariable star designation,V1828 Aquilae.[5]

Eclipse timing variations

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NSVS 14256825 has been extremely well-studied usingphotometry,[7]but the resulting models often contradict each other, even with similar statistical significance,[8]or with data that are collected later.[7]Many studies have found that this system exhibitseclipse timing variations(ETVs) that are significant, cyclic[7]and not explainable by other stellar mechanisms such as theApplegate mechanism.[9]In 2012, it was found that the orbit of NSVS 14256825 was increasing at a rate of12×10−12days 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 ofJupiterorbiting 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 to15MJ[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

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References

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  1. ^abcdAlmeida, L. A.; Jablonski, F.; Tello, J.; Rodrigues, C. V. (2012). "A photometric and spectroscopic study of NSVS 14256825: the second sdOB+dM eclipsing binary".Monthly Notices of the Royal Astronomical Society.423(1): 478–485.arXiv:1203.1266.Bibcode:2012MNRAS.423..478A.doi:10.1111/j.1365-2966.2012.20891.x.S2CID119177743.{{cite journal}}:CS1 maint: unflagged free DOI (link)
  2. ^abcdefBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.
  3. ^abc"Notes on NSVS 1425 (AB) b".Extrasolar Planets Encyclopaedia.Retrieved26 November2016.
  4. ^Kupfer, T.; Geier, S.; Heber, U.; Østensen, R. H.; Barlow, B. N.; Maxted, P. F. L.; Heuser, C.; Schaffenroth, V.; Gänsicke, B. T. (2015). "Hot subdwarf binaries from the MUCHFUSS project. Analysis of 12 new systems and a study of the short-period binary population".Astronomy and Astrophysics.576:A44.arXiv:1501.03692.Bibcode:2015A&A...576A..44K.doi:10.1051/0004-6361/201425213.S2CID53724563.
  5. ^ab"NSVS 14256825".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2020-10-16.
  6. ^Woźniak, P. R.; Vestrand, W. T.; Akerlof, C. W.; Balsano, R.; Bloch, J.; Casperson, D.; Fletcher, S.; Gisler, G.; Kehoe, R.; Kinemuchi, K.; Lee, B. C.; Marshall, S.; McGowan, K. E.; McKay, T. A.; Rykoff, E. S.; Smith, D. A.; Szymanski, J.; Wren, J. (2004). "Northern Sky Variability Survey: Public Data Release".The Astronomical Journal.127(4): 2436–2449.arXiv:astro-ph/0401217.Bibcode:2004AJ....127.2436W.doi:10.1086/382719.S2CID2974543.
  7. ^abcPulley, D.; Faillace, G.; Smith, D.; Watkins, A.; von Harrach, S. (2018). "The quest for stable circumbinary companions to post-common envelope SDB eclipsing binaries. Does the observational evidence support their existence?".Astronomy and Astrophysics.611:611.arXiv:1711.03749.Bibcode:2018A&A...611A..48P.doi:10.1051/0004-6361/201731125.S2CID54997940.
  8. ^Hinse, Tobias Cornelius; Lee, Jae Woo; Goździewski, Krzysztof; Horner, Jonathan; Wittenmyer, Robert A. (2014). "Revisiting the proposed circumbinary multiplanet system NSVS 14256825".Monthly Notices of the Royal Astronomical Society.438(1): 307.arXiv:1311.3021.Bibcode:2014MNRAS.438..307H.doi:10.1093/mnras/stt2183.{{cite journal}}:CS1 maint: unflagged free DOI (link)
  9. ^abNasiroglu, Ilham; Goździewski, Krzysztof; Słowikowska, Aga; Krzeszowski, Krzysztof; Żejmo, Michał; Zola, Staszek; Er, Huseyin; Ogłoza, Waldemar; Dróżdż, Marek; Koziel-Wierzbowska, Dorota; Debski, Bartlomiej; Karaman, Nazli (2017)."Is There a Circumbinary Planet around NSVS 14256825?".The Astronomical Journal.153(3): 137.arXiv:1701.05211.Bibcode:2017AJ....153..137N.doi:10.3847/1538-3881/aa5d10.S2CID118936443.
  10. ^Kilkenny, D.; Koen, C. (2012)."Detection of an increasing orbital period in the subdwarf B eclipsing system NSVS 14256825".Monthly Notices of the Royal Astronomical Society.421(4): 3238.Bibcode:2012MNRAS.421.3238K.doi:10.1111/j.1365-2966.2012.20547.x.hdl:10566/891.
  11. ^Beuermann, K.; Breitenstein, P.; Debski, B.; Diese, J.; Dubovsky, P. A.; Dreizler, S.; Hessman, F. V.; Hornoch, K.; Husser, T. -O.; Pojmanski, G.; Wolf, M.; Woźniak, P. R.; Zasche, P.; Denk, B.; Langer, M.; Wagner, C.; Wahrenberg, D.; Bollmann, T.; Habermann, F. N.; Haustovich, N.; Lauser, M.; Liebing, F.; Niederstadt, F. (2012). "The quest for companions to post-common envelope binaries. II. NSVS14256825 and HS0705+6700".Astronomy and Astrophysics.540:A8.arXiv:1202.5990.Bibcode:2012A&A...540A...8B.doi:10.1051/0004-6361/201118105.S2CID119267859.
  12. ^Zhu, Li-Ying; Qian, Sheng-Bang; Fernández Lajús, Eduardo; Wang, Zhi-Hua; Li, Lin-Jia; -J, Li L. (2019). "A close-in substellar object orbiting the sdOB-type eclipsing-binary system NSVS 14256825".Research in Astronomy and Astrophysics.19(9): 134.arXiv:1904.11664.Bibcode:2019RAA....19..134Z.doi:10.1088/1674-4527/19/9/134.S2CID135471537.
  13. ^Wolf, M.; Kučáková, H.; Zasche, P.; Hornoch, K.; Kára, J.; Merc, J.; Zejda, M. (2021). "Possible substellar companions in dwarf eclipsing binaries. SDSS J143547.87+373338.5, NSVS 7826147, and NSVS 14256825".Astronomy and Astrophysics.647:647.arXiv:2101.08475.Bibcode:2021A&A...647A..65W.doi:10.1051/0004-6361/202039851.S2CID231662494.
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