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HD 190007

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HD 190007

Four representativelight curvesfor HD 190007, adapted from Burtet al.(2020)[1]
Observation data
EpochJ2000EquinoxJ2000
Constellation Aquila[2]
Right ascension 20h02m47.04569s[3]
Declination +03° 19′ 34.2658″[3]
Apparent magnitude(V) 7.46[1]
Characteristics
Evolutionary stage main sequence[4]
Spectral type K5 V[5]
U−Bcolor index +1.09[6]
B−Vcolor index +1.11[6]
Variable type BY Dra[7]
Astrometry
Radial velocity(Rv)−30.268±0.0013[8]km/s
Proper motion(μ)RA:−90.383mas/yr[3]
Dec.:119.430mas/yr[3]
Parallax(π)78.6465 ± 0.0198mas[3]
Distance41.47 ± 0.01ly
(12.715 ± 0.003pc)
Absolute magnitude(MV)6.91[2]
Details
Mass0.77±0.02[1]M☉
Radius0.80[9]R☉
Luminosity0.24[9]L☉
Surface gravity(logg)4.50[10]cgs
Temperature4,610±20[1]K
Metallicity[Fe/H]0.16[10]dex
Rotation28.626±0.046d[1]
Other designations
V1654 Aql,BD+02°4076,GJ775,HD190007,HIP98698,SAO125379[11]
Database references
SIMBADdata
ARICNSdata

HD 190007,also known asGliese 775,is astarwith a close orbitingexoplanetin theconstellationofAquila.Parallaxmeasurements byGaiaput the star at a distance of 41.5light-years(12.7parsecs) away from the Sun. It is drifting closer with aradial velocityof −30.3 km/s,[8]and is predicted to come within 11.8 light-years in 375,000 years.[12]The star has anabsolute magnitudeof 6.91,[2]but at its present distance theapparent visual magnitudeis 7.46,[1]which is too faint to be viewed with the naked eye.

Thespectrumof HD 190007 matches aK-type main-sequence starwith astellar classificationof K5 V.[5]It is classified as aBY Draconis variable,showing a moderate level ofmagnetic activityin itschromosphere[4]with a suspectedactivity cyclelasting 13.7 years.[13]The star displays a mild enhancement ofmetalsand its age is uncertain. It has 77%[1]of the mass of the Sun, 80% of the Sun's radius,[9]and is spinning with arotation periodof 28.6 days.[1]HD 190007 is radiating 24%[9]of the luminosity of the Sun from itsphotosphereat aneffective temperatureof 4,610 K.[1]

Planetary system

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The exoplanet HD 190007 b on a close orbit was first detected in 2020 by theradial-velocity method.[1]Between 2015 and 2019, theRoque de los Muchachos Observatoryin the Canary Islands observed HD 190007 to accumulate 37spectrographs.This, combined with 33 spectrographs from theW. M. Keck Observatoryin Hawaii over 6 years (1998 to 2014), flux measurements from theFairborn Observatoryin Arizona over 20 years, and a two-minute cadence with theTransiting Exoplanet Survey Satellitein 2022 provided the data to update the exoplanetary parameters by M. Stalport and associates in 2023.[4]

As theinclinationof theorbital planeis uncertain, only a lower bound on the exoplanet mass can be determined. It has at least 15.5 times the mass of theEarth.It is orbiting close to its parent star with a moderateeccentricityand aperiodof just 11.7 days.

The HD 190007 planetary system[1][4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥15.5+1.2
−1.3M🜨 		0.092±0.0008 11.724128(99) 0.136+0.085
−0.080 		— —

See also

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References

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  1. ^abcdefghijkBurt, Jennifer; et al. (2021)."A Collage of Small Planets from the Lick–Carnegie Exoplanet Survey: Exploring the Super-Earth and Sub-Neptune Mass Regime".The Astronomical Journal.161(1): 10.arXiv:2011.08867.Bibcode:2021AJ....161...10B.doi:10.3847/1538-3881/abc2d0.S2CID227013469.
  2. ^abcAnderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters.38(5): 331.arXiv:1108.4971.Bibcode:2012AstL...38..331A.doi:10.1134/S1063773712050015.S2CID119257644.
  3. ^abcdVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData 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.S2CID244398875. Gaia DR3 record for this sourceatVizieR.
  4. ^abcdStalport, M.; et al. (August 2023). "A review of planetary systems around HD 99492, HD 147379 and HD 190007 with HARPS-N".Astronomy & Astrophysics.678:A90.arXiv:2308.05669.Bibcode:2023A&A...678A..90S.doi:10.1051/0004-6361/202346887.S2CID260775534.A90.
  5. ^abKirkpatrick, J. D.; et al. (1991)."A standard stellar spectral sequence in the red/near-infrared - Classes K5 to M9".Astrophysical Journal Supplement Series.77:417.Bibcode:1991ApJS...77..417K.doi:10.1086/191611.
  6. ^abJ.-C., Mermilliod (1986)."Compilation of Eggen's UBV data, transformed to UBV (unpublished)".Catalogue of Eggen's UBV Data.Bibcode:1986EgUBV........0M.
  7. ^Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)".VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.1:B/gcvs.Bibcode:2009yCat....102025S.
  8. ^abSoubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars".Astronomy and Astrophysics.616:A7.arXiv:1804.09370.Bibcode:2018A&A...616A...7S.doi:10.1051/0004-6361/201832795.S2CID52952408.
  9. ^abcdChandler, Colin Orion; et al. (2016)."The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars".The Astronomical Journal.151(3): 59.arXiv:1510.05666.Bibcode:2016AJ....151...59C.doi:10.3847/0004-6256/151/3/59.S2CID119246448.
  10. ^abMishenina, T. V.; et al. (2013). "Abundances of neutron-capture elements in stars of the Galactic disk substructures".Astronomy & Astrophysics.552:A128.arXiv:1303.1730.Bibcode:2013A&A...552A.128M.doi:10.1051/0004-6361/201220687.S2CID119268097.
  11. ^"HD 190007".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved4 September2017.
  12. ^Bailer-Jones, C.A.L.; et al. (2018). "New stellar encounters discovered in the second Gaia data release".Astronomy & Astrophysics.616:A37.arXiv:1805.07581.Bibcode:2018A&A...616A..37B.doi:10.1051/0004-6361/201833456.S2CID56269929.
  13. ^Obridko, V. N.; et al. (October 2022)."Solar and stellar activity cycles - no synchronization with exoplanets".Monthly Notices of the Royal Astronomical Society.516(1): 1251–1255.arXiv:2208.06190.Bibcode:2022MNRAS.516.1251O.doi:10.1093/mnras/stac2286.
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