HD 154088

Last updated
HD 154088
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Ophiuchus
Right ascension 17h 04m 27.84s ± 5.62 [1]
Declination −28° 34 57.64 ± 3.16 [1]
Apparent magnitude  (V)6.7258 ± 0.005 [1]
Characteristics
Spectral type K0V
B−V color index 0.814 ± 0.034 [1]
Astrometry
Radial velocity (Rv)14.2972 ± 0.0003 [2]  km/s
Proper motion (μ)RA: 83.76 ± 0.64 [1]   mas/yr
Dec.: -268.69 ± 0.36 [1]   mas/yr
Parallax (π)56.06 ± 0.50  mas [1]
Distance 58.2 ± 0.5  ly
(17.8 ± 0.2  pc)
Absolute magnitude  (MV)5.47 ± 0.02
Details
Mass 0.97 ± 0.05 [3]   M
Radius 0.95 ± 0.03 [4]   R
Luminosity 0.68 +0.06
0.05
(log -0.169 ± 0.033) [5]   L
Surface gravity (log g)4.40 ± 0.11 [3]   cgs
Temperature 5423 ± 51 [3]   K
Metallicity [Fe/H]0.31 ± 0.03 [3]   dex
Rotation 42.6 ± 4.4 [6]
Rotational velocity (v sin i)1.9 ± 0.5 [5]  km/s
Age 3 - 8 [3]   Gyr
Other designations
CD−28° 12769, GJ  652, HIP  83541, SAO  184990
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

HD 154088 is a seventh magnitude metal-rich K-type main sequence star that lies approximately 58 light-years away in the constellation of Ophiuchus. The star is orbited by a hot Super-Earth.

Contents

Properties

The position of HD 154088 on the Hertzsprung-Russell diagram. HRDiagram.png
The position of HD 154088 on the Hertzsprung-Russell diagram.
Chess tile xg.svg

HD 154088 is a modestly bright star that lies at the bottom of Ophiuchus, near to the border with Scorpius and near to the plane of the Milky Way. The star was recognised as a high proper motion star during the last century, and early Earth-based parallax measurements such as that of the Gliese Catalogue of Nearby Stars indicated a distance of about 50 light-years.

The star has a spectral type of K0V, indicating that it is a main sequence star that is about 350 degrees cooler than the Sun. On the Hertzsprung-Russell diagram (left), the star lies slightly above the main sequence. This is because the star is very metal-rich; with an Fe/H of 0.3 dex the star has about twice the solar abundance of iron, which makes HD 154088 fall into the somewhat vague group of super metal-rich (SMR) stars. The giant planet occurrence rate of Fe/H = 0.3 stars is on the order of 30%, but HD 154088 is not currently known to host any giant planets.

HD 154088 has a pronounced magnetic field. [3] It also has a magnetic cycle similar to the Sun, [6] though its length is not well constrained.

The survey in 2015 have ruled out the existence of any additional stellar companions at projected distances from 8 to 119 astronomical units. [7]

Planetary system

A planet orbiting HD 154088 discovered with the HARPS spectrograph was announced in September 2011. With a minimum mass of 6 Earth masses, the companion falls into the regime of Super-Earths.

The HD 154088 planetary system [2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b≥6.15 ± 0.86  M🜨 0.1316 ± 0.002118.596 ± 0.0210.38 ± 0.15

HD 154088 is also being observed under the Keck Eta-Earth radial velocity survey. [8] HD 154088 b is a close match for planet candidate 1 (orbital period = 18.1 days, minimum mass = 6.5 M🜨), so they may be the same detection. The planet existence was finally confirmed in 2021. [9]

Related Research Articles

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<span class="mw-page-title-main">HD 40307</span> Star in the constellation Pictor

HD 40307 is an orange (K-type) main-sequence star located approximately 42 light-years away in the constellation of Pictor, taking its primary name from its Henry Draper Catalogue designation. It is calculated to be slightly less massive than the Sun. The star has six known planets, three discovered in 2008 and three more in 2012. One of them, HD 40307 g, is a potential super-Earth in the habitable zone, with an orbital period of about 200 days. This object might be capable of supporting liquid water on its surface, although much more information must be acquired before its habitability can be assessed.

Nu<sup>2</sup> Lupi Star in the constellation of Lupus

Nu2 Lupi (ν2 Lupi) is a 6th magnitude G-type main-sequence star located approximately 48 light-years away in the constellation of Lupus. The physical properties of the star are similar to those of the Sun, though Nu2 Lupi is significantly older.

HD 204313 is a star with two and possibly three exoplanetary companions in the southern constellation of Capricornus. With an apparent magnitude of 7.99, it is an eighth magnitude star that is too faint to be readily visible to the naked eye. The star is located at a distance of 157 light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −10 km/s.

<span class="mw-page-title-main">HD 10180</span> Star in the constellation Hydrus

HD 10180, also designated 2MASS J01375356-6030414, is a Sun-like star in the southern constellation Hydrus that is notable for its large planetary system. Since its discovery, at least six exoplanets have been observed orbiting it, and some studies have proposed up to nine potential planets, which would make it potentially the largest of all known planetary systems, including the Solar System.

<span class="mw-page-title-main">HD 114613</span> Star in the constellation Centaurus

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<span class="mw-page-title-main">HD 40307 e</span> Extrasolar planet in the constellation Pictor

HD 40307 e is an extrasolar planet candidate suspected to be orbiting the star HD 40307. It is located 42 light-years away in the direction of the southern constellation Pictor. The planet was discovered by the radial velocity method, using the European Southern Observatory's HARPS apparatus by a team of astronomers led by Mikko Tuomi at the University of Hertfordshire and Guillem Anglada-Escude of the University of Göttingen, Germany.

HD 40307 f is an extrasolar planet orbiting the star HD 40307. It is located 42 light-years away in the direction of the southern constellation Pictor. The planet was discovered by the radial velocity method, using the European Southern Observatory's HARPS apparatus by a team of astronomers led by Mikko Tuomi at the University of Hertfordshire and Guillem Anglada-Escude of the University of Göttingen, Germany. The existence of planet was confirmed in 2015.

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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.

<span class="mw-page-title-main">HD 189567</span> Star in the constellation Pavo

HD 189567 is a G3V star located 58.5 light years away, in the constellation of Pavo. The star HD 189567 is also known as Gliese 776, CD-67 2385, and HR 7644.

HD 39194 is a star located in the southern circumpolar constellation Mensa. It has an apparent magnitude of 8.07, making it readily visible in binoculars but not to the naked eye. The object is relatively close at a distance of 86 light years but is receding with a heliocentric radial velocity of 13.9 km/s.

HD 21693 is a star in the constellation Reticulum. It has an apparent visual magnitude of 7.94, therefore it is not visible to the naked eye. From its parallax measured by the Gaia spacecraft, it is located at a distance of 108.6 light-years (33.3 parsecs) from Earth.

References

  1. 1 2 3 4 5 6 7 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 Mayor, M.; et al. (2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv: 1109.2497 . Bibcode:2011arXiv1109.2497M.{{cite journal}}: Cite journal requires |journal= (help)
  3. 1 2 3 4 5 6 Fossati, L.; et al. (2013). "Detection of a magnetic field in three old and inactive solar-like planet-hosting stars". Astronomy. 551: A85. arXiv: 1302.0879 . Bibcode:2013A&A...551A..85F. doi:10.1051/0004-6361/201220997. S2CID   53377473.
  4. Takeda, Genya; et al. (2007). "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog". The Astrophysical Journal Supplement Series. 168 (2): 297–318. arXiv: astro-ph/0607235 . Bibcode:2007ApJS..168..297T. doi:10.1086/509763. S2CID   18775378.
  5. 1 2 Valenti, J. A.; Fischer, D. A. (2005). "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs". The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi: 10.1086/430500 .
  6. 1 2 Lovis, C.; et al. (2011). "The HARPS search for southern extra-solar planets. XXXI. Magnetic activity cycles in solar-type stars: statistics and impact on precise radial velocities". arXiv: 1107.5325 . Bibcode:2011arXiv1107.5325L.{{cite journal}}: Cite journal requires |journal= (help)
  7. Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3): 3127–3136. Bibcode:2015MNRAS.450.3127M. doi: 10.1093/mnras/stv771 . hdl: 1887/49340 . Retrieved 19 June 2020.
  8. Howard, Andrew A.; et al. (2010). "The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters". Science. 330 (6004): 653–655. arXiv: 1011.0143 . Bibcode:2010Sci...330..653H. doi:10.1126/science.1194854. PMID   21030652. S2CID   34792507.
  9. Unger, N.; Ségransan, D.; Queloz, D.; Udry, S.; Lovis, C.; Mordasini, C.; Ahrer, E.; Benz, W.; Bouchy, F.; Delisle, J.-B.; Díaz, R. F.; Dumusque, X.; Lo Curto, G.; Marmier, M.; Mayor, M.; Pepe, F.; Santos, N. C.; Stalport, M.; Alonso, R.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Moutou, C.; Pollacco, D.; Pompei, E. (2021), "The HARPS search for southern extra-solar planets", Astronomy & Astrophysics, 654: A104, arXiv: 2108.10198 , Bibcode:2021A&A...654A.104U, doi:10.1051/0004-6361/202141351