HD 22781

HD 22781
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Perseus
Right ascension	03h 40m 49.5246s
Declination	+31° 49′ 34.6489″
Apparent magnitude (V)	8.78
Characteristics
Evolutionary stage	main-sequence star
Spectral type	K0
Astrometry
Radial velocity (Rv)	8.26 km/s
Proper motion (μ)	RA: 40.576 mas/yr ; Dec.: −94.254 mas/yr
Parallax (π)	30.6433 ± 0.1071 mas
Distance	106.4 ± 0.4 ly ; (32.6 ± 0.1 pc)
Absolute magnitude (MV)	+6.21
Details
Mass	0.75±0.02 M☉
Radius	0.70±0.02 R☉
Surface gravity (log g)	4.57±0.04 cgs
Temperature	5175±15 K
Metallicity [Fe/H]	−0.35±0.02 dex
Rotational velocity (v sin i)	1.73 km/s
Age	4.14±3.63 Gyr
Other designations
	BD+31 630, Gaia DR2 217334764042444288, HD 22781, HIP 17187, TYC 2355-246-1, GSC 02355-00246, 2MASS J03404953+3149345
Database references
SIMBAD	data

Short description: Star in the constellation Perseus

HD 22781, is a single star about 106 light-years away. It is a K-type main-sequence star. The star’s age is poorly constrained at 4.14±3.63 billion years, but is likely similar to that of the Sun.^[6] HD 22781 is heavily depleted in heavy elements, having just 45% of Sun's concentration of iron,^[3] yet is comparatively rich in carbon, having 90% of Sun's abundance.^[6]

An imaging survey in 2012 has failed to find any stellar companions, suggesting HD 22781 is a single star.^[7]

Planetary system

In 2011 a transiting superjovian planet or brown dwarf b was detected on an extremely eccentric orbit.^[4] It is located just outside of the conservative habitable zone of the parent star.^[8] Planets around such metal-poor stars are rare; the only three known similar cases are HD 111232 and HD 181720.^[9]

In 2012, a radial velocity data review indicated there are no additional giant planets in the system.^[10]

The HD 22781 planetary system^[4]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥13.65±0.97 M_J	1.167±0.039	528.07±0.14	0.8191±0.0023	—	—

References

↑ ^1.0 ^1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
↑ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 "HD 22781". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+22781.
↑ ^3.0 ^3.1 ^3.2 Maldonado, J.; Villaver, E.; Eiroa, C.; Micela, G. (2019), "Connecting substellar and stellar formation. The role of the host star's metallicity", Astronomy & Astrophysics 624: A94, doi:10.1051/0004-6361/201833827, Bibcode: 2019A&A...624A..94M
↑ ^4.0 ^4.1 ^4.2 ^4.3 Díaz, Rodrigo F.; Santerne, Alexandre; Sahlmann, Johannes; Hébrard, Guillaume; Eggenberger, Anne; Santos, Nuno C.; Moutou, Claire; Arnold, Luc et al. (2012), "The SOPHIE search for northern extrasolar planets IV. Massive companions in the planet-brown dwarf boundary", Astronomy & Astrophysics A113: 538, doi:10.1051/0004-6361/201117935, Bibcode: 2012A&A...538A.113D
↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
↑ ^6.0 ^6.1 ^6.2 Maldonado, J.; Villaver, E. (2017), "Searching for chemical signatures of brown dwarf formation", Astronomy & Astrophysics 602: A38, doi:10.1051/0004-6361/201630120, Bibcode: 2017A&A...602A..38M
↑ Ginski, C.; Mugrauer, M.; Seeliger, M.; Eisenbeiss, T. (2012), "A lucky imaging multiplicity study of exoplanet host stars", Monthly Notices of the Royal Astronomical Society 421 (3): 2498–2509, doi:10.1111/j.1365-2966.2012.20485.x, Bibcode: 2012MNRAS.421.2498G
↑ Agnew, Matthew T.; Maddison, Sarah T.; Thilliez, Elodie; Horner, Jonathan (2017), "Stable habitable zones of single Jovian planet systems", Monthly Notices of the Royal Astronomical Society 471 (4): 4494–4507, doi:10.1093/mnras/stx1449, Bibcode: 2017MNRAS.471.4494A
↑ Adibekyan, Vardan (2019), "Heavy Metal Rules. I. Exoplanet Incidence and Metallicity", Geosciences 9 (3): 105, doi:10.3390/geosciences9030105, Bibcode: 2019Geosc...9..105A
↑ Wittenmyer, Robert A.; Wang, Songhu; Horner, Jonathan; Tinney, C. G.; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Bailey, J. et al. (2013), "Forever alone? Testing single eccentric planetary systems for multiple companions", The Astrophysical Journal Supplement Series 208 (1): 2, doi:10.1088/0067-0049/208/1/2, Bibcode: 2013ApJS..208....2W

Coordinates: 03^h 40^m 49.5246^s, +31° 49′ 34.6489″

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Original source: https://en.wikipedia.org/wiki/HD 22781. Read more

[xhip-1] 1.0 ^1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.

[simbad-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 "HD 22781". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+22781.

[Maldonado2019-3] 3.0 ^3.1 ^3.2 Maldonado, J.; Villaver, E.; Eiroa, C.; Micela, G. (2019), "Connecting substellar and stellar formation. The role of the host star's metallicity", Astronomy & Astrophysics 624: A94, doi:10.1051/0004-6361/201833827, Bibcode: 2019A&A...624A..94M

[Diaz2011-4] 4.0 ^4.1 ^4.2 ^4.3 Díaz, Rodrigo F.; Santerne, Alexandre; Sahlmann, Johannes; Hébrard, Guillaume; Eggenberger, Anne; Santos, Nuno C.; Moutou, Claire; Arnold, Luc et al. (2012), "The SOPHIE search for northern extrasolar planets IV. Massive companions in the planet-brown dwarf boundary", Astronomy & Astrophysics A113: 538, doi:10.1051/0004-6361/201117935, Bibcode: 2012A&A...538A.113D

[dr2-5] Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.

[Maldonado2017-6] 6.0 ^6.1 ^6.2 Maldonado, J.; Villaver, E. (2017), "Searching for chemical signatures of brown dwarf formation", Astronomy & Astrophysics 602: A38, doi:10.1051/0004-6361/201630120, Bibcode: 2017A&A...602A..38M

[7] Ginski, C.; Mugrauer, M.; Seeliger, M.; Eisenbeiss, T. (2012), "A lucky imaging multiplicity study of exoplanet host stars", Monthly Notices of the Royal Astronomical Society 421 (3): 2498–2509, doi:10.1111/j.1365-2966.2012.20485.x, Bibcode: 2012MNRAS.421.2498G

[8] Agnew, Matthew T.; Maddison, Sarah T.; Thilliez, Elodie; Horner, Jonathan (2017), "Stable habitable zones of single Jovian planet systems", Monthly Notices of the Royal Astronomical Society 471 (4): 4494–4507, doi:10.1093/mnras/stx1449, Bibcode: 2017MNRAS.471.4494A

[9] Adibekyan, Vardan (2019), "Heavy Metal Rules. I. Exoplanet Incidence and Metallicity", Geosciences 9 (3): 105, doi:10.3390/geosciences9030105, Bibcode: 2019Geosc...9..105A

[10] Wittenmyer, Robert A.; Wang, Songhu; Horner, Jonathan; Tinney, C. G.; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Bailey, J. et al. (2013), "Forever alone? Testing single eccentric planetary systems for multiple companions", The Astrophysical Journal Supplement Series 208 (1): 2, doi:10.1088/0067-0049/208/1/2, Bibcode: 2013ApJS..208....2W

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Observation data Equinox J2000.0]] (ICRS)
Constellation	Perseus^[1]
Right ascension	03^h 40^m 49.5246^s^[2]
Declination	+31° 49′ 34.6489″^[2]
Apparent magnitude (V)	8.78^[3]
Characteristics
Evolutionary stage	main-sequence star^[4]
Spectral type	K0^[3]
Astrometry

Radial velocity (R_v)	8.26^[2] km/s
Proper motion (μ)	RA: 40.576^[2] mas/yr Dec.: −94.254^[2] mas/yr
Parallax (π)	30.6433 ± 0.1071^[5] mas
Distance	106.4 ± 0.4 ly (32.6 ± 0.1 pc)
Absolute magnitude (M_V)	+6.21^[1]

Details^[6]

Mass	0.75±0.02 `M`_☉
Radius	0.70±0.02 `R`_☉
Surface gravity (log g)	4.57±0.04 cgs
Temperature	5175±15 K
Metallicity [Fe/H]	−0.35±0.02 dex
Rotational velocity (v sin i)	1.73^[4] km/s
Age	4.14±3.63 Gyr

Other designations
BD+31 630, Gaia DR2 217334764042444288, HD 22781, HIP 17187, TYC 2355-246-1, GSC 02355-00246, 2MASS J03404953+3149345^[2]
Database references
SIMBAD	data

v t e Stars of Perseus
Bayer	α (Mirfak) β (Algol) γ δ ε ζ η (Miram) θ ι κ (Misam) λ μ ν ξ (Menkib) ο (Atik) π (Gorgonea Secunda) ρ (Gorgonea Tertia) σ τ φ ψ ω (Gorgonea Quarta) b
Flamsteed	1 2 3 4 (g) 5 7 (χ) 8 9 (i) 10 11 12 14 16 17 20 21 24 29 30 31 32 (l) 34 36 40 (o) 42 (n) 43 (A) 48 (c) 49 50 52 (f) 53 (d) 54 55 56 57 (m) 58 (e) 59 1 Aur
Variable	S T U V X Z RS RT RV RW RY ST SU SV TZ UV UX UY VX XX XY XZ YZ AB AG AR AS AW AX BM DM DY FO GK IK IP IQ IU IW IX IZ KP KS KT KW LX V351 V356 V357 V361 V376 V380 V386 V396 V392 V400 V423 V432 V440 V459 V461 V471 V472 V473 V480 V490 V492 V493 V505 V509 V520 (61 And) V521 V545 V551 V572 V573 V575 V576 V621 V718
HR	470 526 529 538 540 621 641 787 792 810 820 831 842 846 849 864 865 876 885 886 890 894 918 (k) 920 923 930 949 950 956 964 966 969 973 975 979 986 991 1001 1019 1034 1037 1041 1047 1051 1056 1059 1074 1097 1113 1127 1130 1133 1141 1160 1164 1176 1191 1197 1198 1207 1215 1226 1234 1286 1301 1330 1333 1337 1344 1371 1390 1419 1424 1482 1489 1493 1500 1514
HD	13519 14433 14434 16691 16760 17092 17245 17605 21684 22781 23301 23596 25329 26702 29587
Other	BD+31 643 BD+48 740 G 38-29 G 95-57 GD 61 GRO J0422+32 HAT-P-15 HAT-P-29 IRAS 04296+3429 L1448-IRS2E LkHα 101 LRLL 54361 NGC 1333 13 NGC 1333 IRAS 2A NGC 1333 IRAS 4A NGC 1333 IRAS 4B NSV 1436 PSR B0355+54 PSR J0357+3205
List

HD 22781

Topic: Astronomy

Planetary system

References