HD 219134

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HD 219134
PIA19832-StarHD219134-Location-20150730.jpg
Star HD 219134 (circled) lies just off the "W" shape of the constellation Cassiopeia.
Observation data
Epoch J2000       Equinox J2000
Constellation Cassiopeia
Right ascension 23h 13m 16.97496s [1]
Declination +57° 10′ 06.0838″ [1]
Apparent magnitude  (V)5.574 [2]
Characteristics
Spectral type K3V [3]
U−B color index +0.902 [2]
B−V color index +0.983 [2]
Variable type Suspected [4]
Astrometry
Radial velocity (Rv)−18.68±0.12 [1]  km/s
Proper motion (μ)RA: 2074.414  mas/yr [1]
Dec.: 294.452  mas/yr [1]
Parallax (π)152.8640 ± 0.0494  mas [1]
Distance 21.336 ± 0.007  ly
(6.542 ± 0.002  pc)
Absolute magnitude  (MV)6.46 [5]
Details
Mass 0.81±0.03 [6]   M☉
Radius 0.778±0.005 [6]   R☉
Luminosity 0.2646 [6]   L☉
Surface gravity (log g)4.567±0.018 [6]   cgs
Temperature 4699 [6]   K
Metallicity [Fe/H]+0.11 (± 0.04) [6]   dex
Rotational velocity (v sin i)6.94 [7]  km/s
Age 11.0 [6]   Gyr
Other designations
BD+56 2966, FK5  875, GCTP  5616.00, Gl  892, HD  219134, HIP  114622, HR 8832, LFT  1767, LHS  71, LTT  16826, SAO  35236. [8]
Database references
SIMBAD data

HD 219134 (also known as Gliese 892 or HR 8832) is a main-sequence star in the constellation of Cassiopeia. It is smaller and less luminous than the Sun, with a spectral class of K3V, which makes it an orange-hued star. HD 219134 is relatively close to our system, with an estimated distance of 21.34 light years. This star is close to the limit of apparent magnitude that can still be seen by the unaided eye. The limit is considered to be magnitude 6 for most observers. This star has a magnitude 9.4 optical companion at an angular separation of 106.6  arcseconds. [9]

Contents

Planetary system

HD 219134 has a system of six known exoplanets. The innermost planet, HD 219134 b, is a rocky super-Earth based on size (1.6 times the size of Earth), and density (6.4 grams per cubic cm). [10] [11] This and three additional exoplanets; one super-Earth (designated c and later found to be rocky as well), one Neptunian world (d), and one Jovian world (e); were deduced using HARPS-N radial velocity data by Motalebi et al. in 2015. [12] [13] Two months later, Vogt et al. published a paper on this system which found a 6-planet solution, with planets b, c & d corresponding to those in Motalebi et al., f & g being new planets, and h corresponding to Motalebi's e but with different, and more accurate, estimated parameters. [14] [15]

A number of independent studies have been done regarding the planetary system of HD 219134, with some of their results conflicting with each other. As of March 2017, the star is known to have at least 5 planets, with two of them (HD 219134 b and c) known to be transiting, rocky super-Earths. [16] [17] While a 2016 study suggested that the radial velocity signal corresponding to planet f might be caused by stellar activity, [15] it has been confirmed by subsequent studies in 2017 [16] and 2021. [18] Planet g has not been reported by subsequent studies, and a 2020 study did not find evidence of its claimed 94-day period, but instead found a period of 192 days. [19]

The HD 219134 planetary system [14] [15] [16]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 4.74±0.19  M🜨 0.03876±0.000473.092926±0.0000100 (fixed)85.05±0.09 ° 1.602±0.055  R🜨
c 4.36±0.22  M🜨 0.06530±0.000806.76458±0.000330.062±0.03987.28±0.10 ° 1.511±0.047  R🜨
f >7.30±0.40  M🜨 0.1463±0.001822.717±0.0150.148±0.047——
d >16.17±0.64  M🜨 0.2370±0.003046.859±0.0280.138±0.025——
g >11±1  M🜨 0.3753±0.000494.2±0.20——
h (e) [20] >98  M🜨 3.11±0.042100.6±2.90.06±0.04——

Habitable Zone

The conservative habitable zone (CHZ) of HD 219134 is estimated to extend from 0.516 to 0.948 AU. [21] [22] None of the planets orbiting the star are confirmed to orbit inside the habitable zone. [23] The planet candidate HD 219134 g may orbit slightly interior to the inner edge of the habitable zone based on its initially published parameters, [14] or may orbit within the habitable zone based on a more recent estimated orbital period of 192 days and semi-major axis of 0.603 AU. [19] This planet is significantly more massive than Earth and therefore it likely retains a dense atmosphere, comparable to the Solar System's ice giants.

Related Research Articles

HD 125612 is a binary star system with three exoplanetary companions in the equatorial constellation of Virgo. It is too dim to be visible to the naked eye, having an apparent visual magnitude of 8.31. The system is located at a distance of 188 light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −18 km/s.

HD 154345 is a star in the northern constellation of Hercules. With an apparent visual magnitude of +6.76 it is a challenge to view with the naked eye, but using binoculars it is an easy target. The distance to this star is 59.6 light years based on parallax, but it is drifting closer with a radial velocity of −47 km/s. At least one exoplanet is orbiting this star.

HD 178911 is a triple star system with an exoplanetary companion in the northern constellation of Lyra. With a combined apparent visual magnitude of 6.70, it is a challenge to view with the naked eye. The system is located at a distance of approximately 161 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −38 km/s.

HD 212301 is a binary star system in the south circumpolar constellation of Octans. This star is also called HIP 110852. With an apparent visual magnitude of 7.76, it is too faint to be visible to the naked eye. The system is located at a distance of 177 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +4.7 km/s. It has an absolute magnitude of 4.06.

HD 45364 is a star in the southern constellation of Canis Major. It is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.08. The distance to this system is 112 light years based on parallax. It is drifting further away from the Sun with a radial velocity of +16.4 km/s, having come within 49 light-years some 1.5 million years ago.

HD 86264 is a single star with an exoplanetary companion in the equatorial constellation of Hydra. It is too faint to be readily visible to the naked eye with an apparent visual magnitude of 7.41. The distance to this star, as determined by parallax measurements, is 219 light-years, and it is drifting further away with a radial velocity of +7.4 km/s. A 2015 survey ruled out the existence of any stellar companions at projected distances above 30 astronomical units.

HD 164604 is a single star in the southern constellation of Sagittarius constellation. It has the proper name Pincoya, as selected in the NameExoWorlds campaign by Chile, during the 100th anniversary of the IAU. Pincoya is a female water spirit from southern Chilean mythology who is said to bring drowned sailors to the Caleuche so that they can live in the afterlife. A 2015 survey ruled out the existence of any additional stellar companions at projected distances from 13 to 340 astronomical units. It is known to host a single super-Jupiter exoplanet.

<span class="mw-page-title-main">HD 190007</span> Star in the constellation Aquila

HD 190007, also known as Gliese 775, is a star in the constellation of Aquila. Parallax measurements by Gaia put the star at a distance of 41.5 light-years away.

HD 220689 is a single star in the equatorial constellation of Aquarius. It is a challenge to view with the naked eye, having an apparent visual magnitude of +7.74, but is readily viewed with a pair of binoculars. The star is located at a distance of 153 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +12 km/s. A survey in 2015 has ruled out the existence of any additional stellar companions at projected distances from 26 to 305 astronomical units.

<span class="mw-page-title-main">HD 219134 b</span> Super-Earth orbiting HD 219134

HD 219134 b is one of at least five exoplanets orbiting HD 219134, a main-sequence star in the constellation of Cassiopeia. HD 219134 b has a size of about 1.6 R🜨, and a density of 6.4 g/cm3 and orbits at 21.25 light-years away. The exoplanet was initially detected by the instrument HARPS-N of the Italian Telescopio Nazionale Galileo via the radial velocity method and subsequently observed by the Spitzer telescope as transiting in front of its star. The exoplanet has a mass of about 4.5 times that of Earth and orbits its host star every three days. In 2017, it was found that the planet likely hosts an atmosphere.

HD 222155 is a star in the northern constellation of Andromeda. It is a yellow star that can be viewed with binoculars or a small telescope, but is too faint to be seen with the naked eye at an apparent visual magnitude of 7.1. The imaging survey in 2017 did not detect any stellar companions to HD 222155.

HD 219134 h, also known as HR 8832 h, is an exoplanet orbiting around the K-type star HD 219134 in the constellation of Cassiopeia. It has a minimum mass of 108 Earth masses, which indicates that the planet is likely a gas giant. Unlike HD 219134 b and c it is not observed to transit and thus its radius and density are unknown.

<span class="mw-page-title-main">LTT 1445</span> Star system in the constellation Eridanus

LTT 1445 is a triple M-dwarf system 22.4 light-years distant in the constellation Eridanus. The primary LTT 1445 A hosts two exoplanets—one discovered in 2019 that transits the star every 5.36 days, and another found in 2021 that transits the star every 3.12 days, close to a 12:7 resonance. As of August 2019 it is the second closest transiting exoplanet system discovered, with the closest being HD 219134 bc.

HD 7449 is a binary star system about 126 light-years way. The primary star, HD 7449 A, is a main-sequence star belonging to the spectral class F9.5. It is younger than the Sun. The primary star is slightly depleted of heavy elements, having 80% of solar abundance.

References

  1. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data 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. S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 Oja, T. (August 1986), "UBV photometry of stars whose positions are accurately known. III", Astronomy and Astrophysics Supplement Series, 65 (2): 405–409, Bibcode:1986A&AS...65..405O.
  3. ↑ Frasca, A.; et al. (December 2009), "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv: 0911.0760 , Bibcode:2009A&A...508.1313F, doi:10.1051/0004-6361/200913327, S2CID   118361131.
  4. ↑ Kukarkin, B. V.; et al. (1981), "Nachrichtenblatt der Vereinigung der Sternfreunde e.V. (Catalogue of suspected variable stars)", Nachrichtenblatt der Vereinigung der Sternfreunde E.V. (1981), Moscow: Academy of Sciences USSR Shternberg: 0, Bibcode:1981CSV...C......0K.
  5. ↑ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv: 0811.3982 , Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID   118577511.
  6. 1 2 3 4 5 6 7 "HD 219134". exoplanetarchive.ipac.caltech.edu. Retrieved 2017-12-24.
  7. ↑ Martínez-Arnáiz, R.; et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF), Astronomy and Astrophysics, 520: A79, arXiv: 1002.4391 , Bibcode:2010A&A...520A..79M, doi:10.1051/0004-6361/200913725, S2CID   43455849, archived from the original (PDF) on 2017-09-22, retrieved 2018-11-04.
  8. ↑ "HR 8832". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-04-08.
  9. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID   14878976.
  10. ↑ "PIA19832: Location of Nearest Rocky Exoplanet Known". NASA . 30 July 2015. Retrieved 30 July 2015.
  11. ↑ Chou, Felicia; Clavin, Whitney (30 July 2015). "NASA's Spitzer Confirms Closest Rocky Exoplanet". NASA . Retrieved 31 July 2015.
  12. ↑ Motalebi, F.; et al. (December 2015). "The HARPS-N Rocky Planet Search. I. HD 219134 b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun". Astronomy & Astrophysics . 584: A72. arXiv: 1507.08532 . Bibcode:2015A&A...584A..72M. doi:10.1051/0004-6361/201526822. S2CID   45652878.
  13. ↑ "Cassiopeia's Hidden Gem". Harvard . 30 July 2015. Retrieved 30 July 2015.
  14. 1 2 3 Vogt, Steven S.; et al. (November 2015). "Six Planets Orbiting HD 219134". The Astrophysical Journal . 814 (1): 12. arXiv: 1509.07912 . Bibcode:2015ApJ...814...12V. doi:10.1088/0004-637X/814/1/12. S2CID   45438051.
  15. 1 2 3 Johnson, Marshall C.; et al. (April 2016). "A 12-year Activity Cycle for the Nearby Planet Host Star HD 219134". The Astrophysical Journal . 821 (2): 74. arXiv: 1602.05200 . Bibcode:2016ApJ...821...74J. doi: 10.3847/0004-637X/821/2/74 . S2CID   118651905.
  16. 1 2 3 Gillon, Michaël; et al. (2017). "Two massive rocky planets transiting a K-dwarf 6.5 parsecs away". Nature Astronomy. 1 (3). 0056. arXiv: 1703.01430 . Bibcode:2017NatAs...1E..56G. doi:10.1038/s41550-017-0056. S2CID   56075932.
  17. ↑ "Back Alley Astronomy: HD 219134 Scorecard: 5 planets, 2 transiting". 18 April 2017.
  18. ↑ Rosenthal, Lee J.; et al. (2021). "The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades". The Astrophysical Journal Supplement Series. 255 (1): 8. arXiv: 2105.11583 . Bibcode:2021ApJS..255....8R. doi: 10.3847/1538-4365/abe23c . S2CID   235186973.
  19. 1 2 Hirsch, Lea A.; et al. (2021), "Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc", The Astronomical Journal , 161 (3): 134, arXiv: 2012.09190 , Bibcode:2021AJ....161..134H, doi: 10.3847/1538-3881/abd639 , S2CID   229297873.
  20. ↑ Van Zandt, Judah; et al. (2023), "TESS-Keck Survey. XIV. Two Giant Exoplanets from the Distant Giants Survey", The Astronomical Journal, 165 (2): 60, arXiv: 2209.06958 , Bibcode:2023AJ....165...60V, doi: 10.3847/1538-3881/aca6ef , S2CID   252280288
  21. ↑ "HD 219134 g". ExoKyoto.
  22. ↑ "HD 219134". hzgallery.org.
  23. ↑ Dietrich, Jeremy; Apai, Dániel; Malhotra, Renu (2022). "An Integrative Analysis of the HD 219134 Planetary System and the Inner solar system: Extending DYNAMITE with Enhanced Orbital Dynamical Stability Criteria". The Astronomical Journal. 163 (2): 88. arXiv: 2112.05337 . Bibcode:2022AJ....163...88D. doi: 10.3847/1538-3881/ac4166 . S2CID   245117944.
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