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)
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.^[5] HD 22781 is heavily depleted in heavy elements, having just 45% of Sun's concentration of iron,^[2] yet is comparatively rich in carbon, having 90% of Sun`s abundance.^[5]

An imaging survey in 2012 has failed to find any stellar companions, suggesting HD 22781 is a single star.^[6]

Planetary system

In 2011 a transiting superjovian planet or brown dwarf b was detected on an extremely eccentric orbit.^[3] It is located just outside of the conservative habitable zone of the parent star.^[7] Planets around such metal-poor stars are rare; the only three known similar cases are HD 111232 and HD 181720.^[8]

In 2012, a radial velocity data review indicated there are no additional giant planets in the system.^[9]

The HD 22781 planetary system^[3]
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 ^1.2 ^1.3 ^1.4 ^1.5 "HD 22781". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+22781.
↑ ^2.0 ^2.1 ^2.2 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
↑ ^3.0 ^3.1 ^3.2 ^3.3 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.
↑ ^5.0 ^5.1 ^5.2 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

[simbad-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 "HD 22781". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+22781.

[Maldonado2019-2] 2.0 ^2.1 ^2.2 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

[Diaz2011-3] 3.0 ^3.1 ^3.2 ^3.3 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

[dr2-4] 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.

[Maldonado2017-5] 5.0 ^5.1 ^5.2 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

[6] 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

[7] 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

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

[9] 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
Right ascension	03^h 40^m 49.5246^s^[1]
Declination	+31° 49′ 34.6489″^[1]
Apparent magnitude (V)	8.78^[2]
Characteristics
Evolutionary stage	main-sequence star^[3]
Spectral type	K0^[2]
Astrometry

Radial velocity (R_v)	8.26^[1] km/s
Proper motion (μ)	RA: 40.576^[1] mas/yr Dec.: −94.254^[1] mas/yr
Parallax (π)	30.6433 ± 0.1071^[4] mas
Distance	106.4 ± 0.4 ly (32.6 ± 0.1 pc)

Details^[5]

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^[3] 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^[1]
Database references
SIMBAD	data

HD 22781

Topic: Astronomy

Planetary system

References