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Coordinates: Sky map 17h 11m 15.7219s, −56° 40′ 50.865″
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{{Short description|Star in the constellation of Ara}}
{{Starbox short
{{Starbox begin}}
| name = HD 154857
{{Starbox observe
| epoch = [[J2000.0]]
| epoch = J2000
| constell = [[Ara (constellation)|Ara]]
| constell = [[Ara (constellation)|Ara]]
| ra = {{RA|17|11|15.7219}}
| dec = {{DEC|–56|40|50.865}}
| ra = {{RA|17|11|15.72180}}<ref name=GaiaDR2/>
| dec = {{DEC|−56|40|50.8706}}<ref name=GaiaDR2/>
| spectral = G5V
| appmag_v = 7.25
| appmag_v = 7.25<ref name=Anderson_Francis_2012/>
| dist_ly = 223.55
| dist_pc = 68.54
| names = HIP 84069, SAO 244491
}}
}}
{{Starbox character
'''HD 154857''' is a [[star]] in the [[Ara (constellation)| constellation Ara]]. Like our [[Sun]], it is a [[yellow dwarf]].
| type =
| class = G5IV-V<ref name="McCarthy2004"/>
| b-v = {{val|0.699|0.001}}<ref name=Anderson_Francis_2012/>
| u-b =
| variable = Constant<ref name=Bonfanti_et_al_2016/>
}}
{{Starbox astrometry
| radial_v = {{val|+28.06|0.15}}<ref name=GaiaDR2/>
| prop_mo_ra = 87.585<ref name=GaiaDR2/>
| prop_mo_dec = −55.891<ref name=GaiaDR2/>
| parallax = 15.7321
| p_error = 0.0385
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v = 3.07<ref name="McCarthy2004"/>
}}
{{Starbox detail
| mass = {{val|1.718|0.03|0.022}}<ref name="Wittenmyer"/>
| radius = {{val|2.1|0.1}}<ref name=Bonfanti_et_al_2016/>
| luminosity = {{val|4.4|0.3}}<ref name=Bonfanti_et_al_2016/>
| temperature = {{val|5740|46|fmt=commas}}<ref name=Bonfanti_et_al_2016/>
| metal_fe = {{val|−0.26|0.01}}<ref name=Sousa_et_al_2018/>
| rotational_velocity = {{val|1.44|0.50}}<ref name=Butler_et_al_2006/>
| gravity = {{val|3.83|0.03}}<ref name=Bonfanti_et_al_2016/>
| age_gyr = {{val|5.8|0.5}}<ref name=Bonfanti_et_al_2016/>
}}
{{Starbox catalog
| names = {{odlist | CD=−56° 6717 | CPC=20 5475 | CPD=−56° 8059 | GC=23146 | GSC=08735-01682 | HD=154857 | HIP=84069 | PPM=345752 | SAO=244491 | TYC=8735-1682-1 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = HD+154857
| ARICNS =
}}
{{Starbox end}}


'''HD 154857''' is a [[star]] with two [[exoplanet]]ary companions in the southern [[constellation]] of [[Ara (constellation)|Ara]]. It is too dim to be visible with the naked eye having an [[apparent visual magnitude]] of 7.25.<ref name=Anderson_Francis_2012/> The star is located at a distance of 207&nbsp;[[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]] measurements, and is drifting further away with a [[radial velocity]] of +28&nbsp;km/s.<ref name=GaiaDR2/>
==Planets==
There is one confirmed and one unconfirmed [[exoplanet|planet]] discovered in 2004 and 2007 respectively.


This is a [[G-type star]] with a [[stellar classification]] of G5IV-V.<ref name="McCarthy2004"/> The [[absolute magnitude]] of this star is two magnitudes above the [[main sequence]], which suggests that the star is [[stellar evolution|evolving]] toward the [[subgiant star|subgiant]] stage.<ref name="McCarthy2004"/> It is a [[metallicity|metal-poor]] [[thin disk]] star<ref name=Gonzalez2009/> approximately six&nbsp;billion years old and is [[magnetic activity|chromopherically quiet]] although not in a [[Maunder Minimum]] state.<ref name=Bonfanti_et_al_2016/> The star is larger, more massive, and more luminous than the Sun. It is spinning with a [[projected rotational velocity]] of 1.4&nbsp;km/s.<ref name=Butler_et_al_2006/>
===HD 154857 b===

{{Planetbox begin
==Planetary system==
| name = HD 154857 b

}}
The discovery of one confirmed and one unconfirmed Jovian [[exoplanet]] was reported in 2004<ref name="McCarthy2004"/> and 2007<ref name="O'Toole2007"/> respectively. The former planet [[HD 154857 b]] has [[mass]] >1.8 times that of [[Jupiter]]. It orbits the star 20% further than [[Earth]]-[[Sun]] distance, taking 409 days with 47% [[Orbital eccentricity|eccentricity]]. The additional object ([[HD 154857 c]]) was confirmed as a planetary companion in January 2014.<ref name="Wittenmyer"/>
{{Planetbox orbit

| semimajor = 1.2±0.2
{{OrbitboxPlanet begin
| eccentricity = 0.47±0.02
| table_ref = <ref name="Wittenmyer" />
| period = 409±1
| ang_dist = 17.518
| long_peri = 59±4
| t_peri = 2450346±5
| semi-amp = 50.4±1
}}
}}
{{OrbitboxPlanet
{{Planetbox character
| exoplanet = [[HD 154857 b|b]]
| mass = &gt; 1.8±0.4
| mass = {{val|2.24|0.05|p=≥&nbsp;}}
}}
| period = {{val|408.6|0.5}}
{{Planetbox discovery
| semimajor = {{val|1.291|0.008}}
| discovery_date = 2004
| eccentricity = {{val|0.06|0.05}}
| discoverers = McCarthy et al.
}}
| discovery_method = Radial velocity
{{OrbitboxPlanet
| discovery_status = Published
| exoplanet = [[HD 154857 c|c]]
}}
| mass = {{val|2.58|0.16|p=≥&nbsp;}}
{{Planetbox end}}
| period = {{val|3452|105|fmt=commas}}
'''HD 154857 b''' is an extrasolar planet of [[gas giant]] mass that orbits the star in an eccentric orbit. This planet was detected by using [[Anglo-Australian Telescope]] (AAT) UCLE [[spectrometer]].
| semimajor = {{val|5.36|0.09}}
<div style="clear:both;"></div>
| eccentricity = {{val|0.06|0.05}}
}}
{{Orbitbox end}}


===HD 154857 c===
==See also==

{{Planetbox begin
* [[List of extrasolar planets]]
| name = HD 154857 c
}}
{{Planetbox orbit
| eccentricity = 0.25
| period = 1900
}}
{{Planetbox discovery
| discovery_date = 2007
| discoverers = O' Toole
| discovery_method = Radial velocity
| discovery_status = Unconfirmed
}}
{{Planetbox end}}
'''HD 154857 c''' is a possible planet discovered in 2007, together with [[HD 23127]] b and [[HD 159868]] b. More measurements are required to confirm its existence.
<div style="clear:both;"></div>


==References==
==References==
{{Reflist|colwidth=30em|refs=
*{{cite journal |url=http://adsabs.harvard.edu/abs/2004ApJ...617..575M |author=McCarthy, Chris; Butler, R. Paul; Tinney, C. G.; Jones, Hugh R. A.; Marcy, Geoffrey W.; Carter, Brad; Penny, Alan J.; Fischer, Debra A. |title=Multiple Companions to HD 154857 and HD 160691 |work=Astronomy Abstract Service |year=2004 |volume=617 |issue=1 |pages=575–579 |accessdate=2007-07-08 |doi=10.1086/425214 |journal=The Astrophysical Journal }}
*{{cite journal | url=http://www.journals.uchicago.edu/doi/abs/10.1086/513563 | author=O'Toole ''et al.'' | title=New Planets around Three G Dwarfs | journal=The [[Astrophysical Journal]] | volume=660 | issue=2 | year=2007 | pages=1636 – 1641 | doi=10.1086/513563 }} ([http://xxx.lanl.gov/abs/astro-ph/0702213 web Preprint])


<ref name=SIMBAD>{{cite simbad
==External links==
| title=HD 154857 | access-date=2021-10-10 }}</ref>
*[http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=HD+154857&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id SIMBAD Query result]
*[http://exoplanet.eu/ '''The Extrasolar Planets Encyclopaedia:'''] [http://vo.obspm.fr/exoplanetes/encyclo/star.php?st=HD+154857 HD 154857] + [http://vo.obspm.fr/exoplanetes/encyclo/planet.php?p1=HD+154857&p2=b b] + [http://vo.obspm.fr/exoplanetes/encyclo/planet.php?p1=HD+154857&p2=c c]


<ref name=GaiaDR2>{{Cite Gaia DR2|5917212800626605824}}</ref>


<ref name=Anderson_Francis_2012>{{cite journal
[[Category:Yellow dwarfs]]
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
[[Category:Extrasolar planets]]
| title=XHIP: An extended hipparcos compilation
[[Category:Ara constellation]]
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>

<ref name="McCarthy2004">{{cite journal
| title=Multiple Companions to HD 154857 and HD 160691
| last1=McCarthy | first1=Chris | last2=Butler | first2=R. Paul
| last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A.
| last5=Marcy | first5=Geoffrey W. | last6=Carter | first6=Brad
| last7=Penny | first7=Alan J. | last8=Fischer | first8=Debra A.
| display-authors=1 | journal=The Astrophysical Journal
| volume=617 | issue=1 | pages=575–579 | date=2004
| arxiv=astro-ph/0409335 | bibcode=2004ApJ...617..575M
| doi=10.1086/425214 | s2cid=119446133 }}</ref>

<ref name="O'Toole2007">{{cite journal
| title=New Planets around Three G Dwarfs
| last1=O'Toole | first1=Simon J. | last2=Butler | first2=R. Paul
| last3=Tinney | first3=C. G. | last4=Jones | first4=Hugh R. A.
| last5=Marcy | first5=Geoffrey W. | last6=Carter | first6=Brad
| last7=McCarthy | first7=Chris | last8=Bailey | first8=Jeremy
| last9=Penny | first9=Alan J. | display-authors=1
| journal=The Astrophysical Journal
| volume=660 | issue=2 | pages=1636–1641 | date=2007
| arxiv=astro-ph/0702213 | bibcode=2007ApJ...660.1636O
| doi=10.1086/513563 | s2cid=118958847 }}</ref>

<ref name="Wittenmyer">{{cite journal
| title=The Anglo-Australian Planet Search. XXIII. Two New Jupiter Analogs
| first1=Robert A. | last1=Wittenmyer | first2=Jonathan | last2=Horner
| first3=C. G. | last3=Tinney | first4=R. P. | last4=Butler
| first5=H. R. A. | last5=Jones | first6=Mikko | last6=Tuomi
| first7=G. S. | last7=Salter | first8=B. D. | last8=Carter
| first9=F. Elliott | last9=Koch | first10=S. J. | last10=O'Toole
| first11=J. | last11=Bailey | first12=D. | last12=Wright
| display-authors=1 | journal=The Astrophysical Journal
| volume=783 | issue=2 | id=103 | pages=9 | date=March 2014
| doi=10.1088/0004-637X/783/2/103 | arxiv=1401.5525
| bibcode=2014ApJ...783..103W | s2cid=14082923 }}</ref>

<ref name=Sousa_et_al_2018>{{cite journal
| title=SWEET-Cat updated. New homogenous spectroscopic parameters
| display-authors=1 | last1=Sousa | first1=S. G.
| last2=Adibekyan | first2=V. | last3=Delgado-Mena | first3=E.
| last4=Santos | first4=N. C. | last5=Andreasen | first5=D. T.
| last6=Ferreira | first6=A. C. S. | last7=Tsantaki | first7=M.
| last8=Barros | first8=S. C. C. | last9=Demangeon | first9=O.
| last10=Israelian | first10=G. | last11=Faria | first11=J. P.
| last12=Figueira | first12=P. | last13=Mortier | first13=A.
| last14=Brandão | first14=I. | last15=Montalto | first15=M.
| last16=Rojas-Ayala | first16=B. | last17=Santerne | first17=A.
| journal=Astronomy & Astrophysics
| volume=620 | id=A58 | pages=13 | date=November 2018
| doi=10.1051/0004-6361/201833350 | arxiv=1810.08108
| bibcode=2018A&A...620A..58S | s2cid=119374557 }}</ref>

<ref name=Bonfanti_et_al_2016>{{cite journal
| title=Age consistency between exoplanet hosts and field stars
| last1=Bonfanti | first1=A.
| last2=Ortolani | first2=S. | last3=Nascimbeni | first3=V.
| journal=Astronomy & Astrophysics
| year=2016 | volume=585 | id=A5 | pages=14
| arxiv=1511.01744 | bibcode=2016A&A...585A...5B
| doi=10.1051/0004-6361/201527297 | s2cid=53971692 }}</ref>

<ref name=Butler_et_al_2006>{{cite journal
| last1=Butler | first1=R. P. | last2=Wright | first2=J. T.
| last3=Marcy | first3=G. W. | last4=Fischer | first4=D. A.
| last5=Vogt | first5=S. S. | last6=Tinney | first6=C. G.
| last7=Jones | first7=H. R. A. | last8=Carter | first8=B. D.
| last9=Johnson | first9=J. A. | display-authors=1
| title=Catalog of Nearby Exoplanets
| journal=The Astrophysical Journal
| volume=646 | issue=1 | pages=505–522 | date=December 2006
| doi=10.1086/504701 | arxiv=astro-ph/0607493
| bibcode=2006ApJ...646..505B | s2cid=119067572 }}</ref>

<ref name=Gonzalez2009>{{cite journal
| title=Stars with planets and the thick disc
| last=Gonzalez | first=Guillermo
| journal=Monthly Notices of the Royal Astronomical Society: Letters
| volume=399 | issue=1 | pages=L103–L107 | date=October 2009
| doi=10.1111/j.1745-3933.2009.00734.x | bibcode=2009MNRAS.399L.103G | doi-access=free }}</ref>

}}

==External links==
* {{cite encyclopedia|url=http://exoplanet.eu/star.php?st=HD+154857|archive-url=https://web.archive.org/web/20070702190615/http://exoplanet.eu/star.php?st=HD+154857|url-status=dead|archive-date=July 2, 2007|encyclopedia=[[Extrasolar Planets Encyclopaedia]]|title=HD 154857|access-date=2008-07-21}}
* [https://web.archive.org/web/20080916061358/http://planetquest.jpl.nasa.gov/atlas/atlas_profile.cfm?Planet=261 http://planetquest.jpl.nasa.gov]


{{Sky|17|11|15.7219|-|56|40|50.865|223.55}}
{{main-star-stub}}
{{Stars of Ara}}


[[sk:HD 154857]]
{{DEFAULTSORT:HD 154857}}
<!-- Properties -->
[[Category:G-type subgiants]]
[[Category:Planetary systems with two confirmed planets]]
<!-- Other -->
[[Category:Ara (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|154857]]
[[Category:Hipparcos objects|084069]]

Latest revision as of 06:22, 22 December 2023

HD 154857
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 11m 15.72180s[1]
Declination −56° 40′ 50.8706″[1]
Apparent magnitude (V) 7.25[2]
Characteristics
Spectral type G5IV-V[3]
B−V color index 0.699±0.001[2]
Variable type Constant[4]
Astrometry
Radial velocity (Rv)+28.06±0.15[1] km/s
Proper motion (μ) RA: 87.585[1] mas/yr
Dec.: −55.891[1] mas/yr
Parallax (π)15.7321 ± 0.0385 mas[1]
Distance207.3 ± 0.5 ly
(63.6 ± 0.2 pc)
Absolute magnitude (MV)3.07[3]
Details
Mass1.718+0.03
−0.022[5] M☉
Radius2.1±0.1[4] R☉
Luminosity4.4±0.3[4] L☉
Surface gravity (log g)3.83±0.03[4] cgs
Temperature5,740±46[4] K
Metallicity [Fe/H]−0.26±0.01[6] dex
Rotational velocity (v sin i)1.44±0.50[7] km/s
Age5.8±0.5[4] Gyr
Other designations
CD−56° 6717, CPD−56° 8059, GC 23146, HD 154857, HIP 84069, SAO 244491, PPM 345752, TYC 8735-1682-1, GSC 08735-01682[8]
Database references
SIMBADdata

HD 154857 is a star with two exoplanetary companions in the southern constellation of Ara. It is too dim to be visible with the naked eye having an apparent visual magnitude of 7.25.[2] The star is located at a distance of 207 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +28 km/s.[1]

This is a G-type star with a stellar classification of G5IV-V.[3] The absolute magnitude of this star is two magnitudes above the main sequence, which suggests that the star is evolving toward the subgiant stage.[3] It is a metal-poor thin disk star[9] approximately six billion years old and is chromopherically quiet although not in a Maunder Minimum state.[4] The star is larger, more massive, and more luminous than the Sun. It is spinning with a projected rotational velocity of 1.4 km/s.[7]

Planetary system

[edit]

The discovery of one confirmed and one unconfirmed Jovian exoplanet was reported in 2004[3] and 2007[10] respectively. The former planet HD 154857 b has mass >1.8 times that of Jupiter. It orbits the star 20% further than Earth-Sun distance, taking 409 days with 47% eccentricity. The additional object (HD 154857 c) was confirmed as a planetary companion in January 2014.[5]

The HD 154857 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥ 2.24±0.05 MJ 1.291±0.008 408.6±0.5 0.06±0.05 — —
c ≥ 2.58±0.16 MJ 5.36±0.09 3,452±105 0.06±0.05 — —

See also

[edit]

References

[edit]
  1. ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c Anderson, 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. S2CID 119257644.
  3. ^ a b c d e McCarthy, Chris; et al. (2004). "Multiple Companions to HD 154857 and HD 160691". The Astrophysical Journal. 617 (1): 575–579. arXiv:astro-ph/0409335. Bibcode:2004ApJ...617..575M. doi:10.1086/425214. S2CID 119446133.
  4. ^ a b c d e f g Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: 14. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297. S2CID 53971692. A5.
  5. ^ a b c Wittenmyer, Robert A.; et al. (March 2014). "The Anglo-Australian Planet Search. XXIII. Two New Jupiter Analogs". The Astrophysical Journal. 783 (2): 9. arXiv:1401.5525. Bibcode:2014ApJ...783..103W. doi:10.1088/0004-637X/783/2/103. S2CID 14082923. 103.
  6. ^ Sousa, S. G.; et al. (November 2018). "SWEET-Cat updated. New homogenous spectroscopic parameters". Astronomy & Astrophysics. 620: 13. arXiv:1810.08108. Bibcode:2018A&A...620A..58S. doi:10.1051/0004-6361/201833350. S2CID 119374557. A58.
  7. ^ a b Butler, R. P.; et al. (December 2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572.
  8. ^ "HD 154857". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-10.
  9. ^ Gonzalez, Guillermo (October 2009). "Stars with planets and the thick disc". Monthly Notices of the Royal Astronomical Society: Letters. 399 (1): L103 – L107. Bibcode:2009MNRAS.399L.103G. doi:10.1111/j.1745-3933.2009.00734.x.
  10. ^ O'Toole, Simon J.; et al. (2007). "New Planets around Three G Dwarfs". The Astrophysical Journal. 660 (2): 1636–1641. arXiv:astro-ph/0702213. Bibcode:2007ApJ...660.1636O. doi:10.1086/513563. S2CID 118958847.
[edit]


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