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{{Short description|Multiple star system in the constellation Aries}}
{{Starbox begin {{Starbox begin
| name = 30 Arietis | name = 30 Arietis
}} }}
{{Starbox image {{Starbox image
| image = ] <!--image location, formatted as "]"--> | image = ]
| caption = <!--caption (optional)--> | caption = 30 Arietis star system hierarchy
| credit = <!--credit for image if the image's use requires them (optional)--> | credit = <!--credit for image if the image's use requires them (optional)-->
}} }}
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| eccentricity = <!--Eccentricity--> | eccentricity = <!--Eccentricity-->
| inclination = <!--Inclination (in degrees)--> | inclination = <!--Inclination (in degrees)-->
| node = <!--Longitude of node (in degrees)-->
| periastron = <!--Periastron epoch-->
| periarg = <!--Argument of periastron (in degrees), secondary -->
| periarg_primary = <!--Argument of periastron (in degrees), primary -->
| k1 = <!-- Velocity semi-amplitude (SB1, or primary in SB2), in km/s -->
| k2 = <!-- Velocity semi-amplitude (secondary in SB2), in km/s -->
}}
{{Starbox orbit
| reference = <ref name=Roberts2015/>
| primary = 30 Arietis B
| name = 30 Arietis Bb
| period = 0.917 ± 0.007
| period_unitless = 335.1 ± 2.5 ]
| axis = <!--Semimajor axis (in arcseconds)-->
| axis_unitless = 0.995 ± 0.012 ]
| eccentricity = 0.289 ± 0.092
| inclination = {{val|4.14|0.96|0.90}}°<ref name="Kiefer2020" />
| node = <!--Longitude of node (in degrees)--> | node = <!--Longitude of node (in degrees)-->
| periastron = <!--Periastron epoch--> | periastron = <!--Periastron epoch-->
Line 95: Line 113:
| metal = | metal =
| rotation = | rotation =
| age_myr = {{val|860|630}}<ref name=Roberts2015/>
| age =
| component2 = 30 Arietis Ba | component2 = 30 Arietis Ba
| mass2 = 1.16 ± 0.04<ref name="Guenther2009"/> | mass2 = 1.16 ± 0.04<ref name="Guenther2009"/>
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| metal2 = | metal2 =
| rotation2 = | rotation2 =
| age_myr2 = {{val|910|830}}<ref name=Roberts2015/>
| age2 =
}}
{{Starbox detail
| component1 = 30 Arietis Bb
| mass_mj = {{val|147|41|29}}<ref name="Kiefer2020" />
}} }}
{{Starbox catalog {{Starbox catalog
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}} }}
{{Starbox reference {{Starbox reference
| Simbad = 30+Ari | Simbad = 30+Ari+A|sn=A
| Simbad2 = 30+Ari+A|sn2=A
| Simbad3 = 30+Ari+B|sn3=B | Simbad3 = 30+Ari+B|sn3=B
| NSTED = 30+Ari+B | NSTED = 30+Ari+B
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{{Starbox end}} {{Starbox end}}


'''30 Arietis''' (abbreviated '''30 Ari''') is a 6th-] ]<ref name="Clavin2015"/> in the ] of ]. ''30 Arietis'' is the ]. 30 Arietis A and B are separated by 38.1" or about 1500 ] at a distance of 130 ]s away. The main components of both systems are both binaries with a composite spectra belonging to ]s, meaning they are ] ] in their cores.<ref name="Guenther2009"/> 30 Arietis A is itself a ] with an orbital period of 1.1 days.<ref name=morbey1974/> The 30 Arietis system is 910 million years old, one fifth the age of the ]. '''30 Arietis''' (abbreviated '''30 Ari''') is a 6th-] ]<ref name="Clavin2015"/> in the ] of ]. ''30 Arietis'' is the ]. 30 Arietis A and B are separated by {{val|38.1|ul="}} or about {{val|1500|ul=AU|fmt=commas}} at a distance of 130 ]s away. The main components of both systems are both binaries with a composite spectra belonging to ]s, meaning they are ] ] in their cores. The 30 Arietis system is 910 million years old, one fifth the age of the ].

==Star system==
30 Arietis A and B are separated by 38.1", corresponding to 1,500 ] at a distance of 130 ]s. The pair are at almost the same distance, have very similar ]s, and are considered almost certain to be gravitationally bound with a likely period around 34,000 years.<ref name=Roberts2015/> The main components of both systems are both binaries with a composite spectra belonging to ]s, meaning they are ] ] in their cores.<ref name="Guenther2009"/>

30 Arietis A is a ] with an orbital period of 1.1 days.<ref name=morbey1974/> The primary Aa is an F-type main sequence star about 31% more massive than the Sun, while the companion Ab is a faint red dwarf only about 15% the mass of the Sun.

30 Arietis B has been reported to have a red dwarf companion at a distance of {{val|22|u=AU}}<ref name=Roberts2015/> and another red dwarf Bb at about {{val|1|ul=AU}}.<ref name="Guenther2009"/> In 2020, after the inclination of the planetary orbit was measured, the "planet" was found to fall in the mass range of a ] or ].<ref name="Kiefer2020"/> The more distant companion was referred to as C to distinguish it from Bb, and at about 0.5" it has been imaged using ]s.<ref name=Roberts2015/>

== 30 Arietis Bb ==
'''30 Arietis Bb''' (sometimes abbreviated '''30 Ari Bb''') is a ] which orbits the ] ] ] 30 Arietis Ba, located in a quintuple star system approximately 146 ]s away in the ] ]. The ], initially believed to be a massive planet or ], was announced in a paper published online on September 24, 2009. It was discovered by using precision ] from the ] installed on the ] in ].<ref name="Guenther2009" /> The star had a ] of nearly 10 times that of ].<ref>{{cite web |url=https://exoplanet.eu/catalog/30_ari_b_b--618/ |title=Notes for Planet 30 Ari B b |author=Jean Schneider |year=2011 |work=] |access-date=3 October 2011}}</ref> In 2020, after the inclination of the planetary orbit was measured to be just 4.14{{±|0.96|0.90}}°, the "planet" was found to fall in the mass range of red dwarf stars.<ref name="Kiefer2020" />


==Planetary system== == See also ==
* ]
On November 27, 2009, the discovery of a very massive planet was announced to be orbiting 30 Arietis B at a distance of about 1 AU.<ref name="Guenther2009"/> In 2020, after the inclination of the planetary orbit was measured, the "planet" was found to fall in the mass range of the red dwarf star.<ref name=Kiefer2020/>
* ]


==References== ==References==
{{Reflist|refs= {{Reflist|refs=


<ref name="Gaia DR2 A">{{Cite Gaia DR2|102082409030066560}}</ref> <ref name="Gaia DR2 A">{{cite Gaia DR2|102082409030066560}}</ref>


<ref name="Gaia DR2 B">{{Cite Gaia DR2|102082477749475200}}</ref> <ref name="Gaia DR2 B">{{cite Gaia DR2|102082477749475200}}</ref>


<ref name="Guenther2009">{{cite journal | title=A substellar component orbiting the F-star 30 Arietis B | url=http://www.aanda.org/articles/aa/full_html/2009/45/aa12112-09/aa12112-09.html | last1=Guenther | first1=E. W. | last2=Hartmann | first2=M. | last3=Esposito | first3=M. | last4=Hatzes | first4=A. P. | last5=Cusano | first5=F. | last6=Gandolfi | first6=D. | display-authors=1 | journal=Astronomy and Astrophysics | volume=507 | issue=3 | pages=1659–1665 | date=2009 | arxiv=0912.4619 | bibcode=2009A&A...507.1659G | doi=10.1051/0004-6361/200912112 }}</ref> <ref name="Guenther2009">{{cite journal | title=A substellar component orbiting the F-star 30 Arietis B | last1=Guenther | first1=E. W. | last2=Hartmann | first2=M. | last3=Esposito | first3=M. | last4=Hatzes | first4=A. P. | last5=Cusano | first5=F. | last6=Gandolfi | first6=D. | display-authors=1 | journal=Astronomy and Astrophysics | volume=507 | issue=3 | pages=1659–1665 | date=2009 | arxiv=0912.4619 | bibcode=2009A&A...507.1659G | bibcode-access=free | doi=10.1051/0004-6361/200912112|s2cid=55685116 | doi-access=free }}</ref>
<!-- <!--
<ref name="Kane2015">{{cite journal | title=On the Stellar Companion to the Exoplanet Hosting Star 30 Arietis B | last1=Kane | first1=Stephen R. | last2=Barclay | first2=Thomas | last3=Hartmann | first3=Michael | last4=Hatzes | first4=Artie P. | last5=Jensen | first5=Eric L. N. | last6=Ciardi | first6=David R. | last7=Huber | first7=Daniel | last8=Wright | first8=Jason T. | last9=Quintana | first9=Elisa V. | display-authors=1 | journal=The Astrophysical Journal | volume=815 | issue=1 | at=32 | year=2015 | arxiv=1511.01533 | bibcode=2015ApJ...815...32K | doi=10.1088/0004-637X/815/1/32 | s2cid=16794035 }}</ref> <ref name="Kane2015">{{cite journal | title=On the Stellar Companion to the Exoplanet Hosting Star 30 Arietis B | last1=Kane | first1=Stephen R. | last2=Barclay | first2=Thomas | last3=Hartmann | first3=Michael | last4=Hatzes | first4=Artie P. | last5=Jensen | first5=Eric L. N. | last6=Ciardi | first6=David R. | last7=Huber | first7=Daniel | last8=Wright | first8=Jason T. | last9=Quintana | first9=Elisa V. | display-authors=1 | journal=The Astrophysical Journal | volume=815 | issue=1 | at=32 | year=2015 | arxiv=1511.01533 | bibcode=2015ApJ...815...32K | doi=10.1088/0004-637X/815/1/32 | s2cid=16794035}}</ref>
--> -->
<ref name="Clavin2015">{{cite web |url=http://www.nasa.gov/jpl/planet-reared-by-four-parent-stars/index.html |title=Planet 'Reared' by Four Parent Stars |author=Whitney Clavin |date=2015 |publisher=] |accessdate=4 March 2015}}</ref> <ref name="Clavin2015">{{cite web |url=http://www.nasa.gov/jpl/planet-reared-by-four-parent-stars/index.html |title=Planet 'Reared' by Four Parent Stars |author=Whitney Clavin |date=2015 |publisher=] |access-date=4 March 2015 |archive-date=4 March 2016 |archive-url=https://web.archive.org/web/20160304225833/http://www.nasa.gov/jpl/planet-reared-by-four-parent-stars/index.html |url-status=dead }}</ref>


<ref name=Kiefer2020>{{cite arXiv|eprint=2009.14164|title=Determining the true mass of radial-velocity exoplanets with Gaia 9 planet candidates in the brown-dwarf/stellar regime and 27 confirmed planets|year=2020|last1=Kiefer|first1=Flavien|last2=Hébrard|first2=Guillaume|last3=Lecavelier|first3=Alain|last4=Martioli|first4=Eder|last5=Dalal|first5=Shweta|last6=Vidal-Madjar|first6=Alfred}}</ref> <ref name="Kiefer2020">{{cite journal | title=Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets | last1=Kiefer | first1=F. | last2=Hébrard | first2=G. | last3=Lecavelier des Etangs | first3=A. | last4=Martioli | first4=E. | last5=Dalal | first5=S. | last6=Vidal-Madjar | first6=A. | display-authors=1 | journal=Astronomy & Astrophysics | volume=645 | page=<!-- to prevent citation bot adding nonexistent page number--> | article-number=A7 | date=January 2021 | arxiv=2009.14164 | bibcode=2021A&A...645A...7K | bibcode-access=free | doi=10.1051/0004-6361/202039168 | doi-access=free | s2cid=221995447 }}</ref>


<ref name=Roberts2015>{{cite journal|arxiv=1503.01211|title=Know the Star, Know the Planet. III. Discovery of Late-Type Companions to Two Exoplanet Host Stars|year=2015|doi=10.1088/0004-6256/149/4/118|last1=Roberts Jr|first1=Lewis C.|last2=Tokovinin|first2=Andrei|last3=Mason|first3=Brian D.|last4=Riddle|first4=Reed L.|last5=Hartkopf|first5=William I.|last6=Law|first6=Nicholas M.|last7=Baranec|first7=Christoph|journal=The Astronomical Journal|volume=149|issue=4|page=118|bibcode=2015AJ....149..118R|s2cid=30908636}}</ref> <ref name=Roberts2015>{{cite journal|arxiv=1503.01211|title=Know the Star, Know the Planet. III. Discovery of Late-Type Companions to Two Exoplanet Host Stars|year=2015|doi=10.1088/0004-6256/149/4/118|last1=Roberts Jr|first1=Lewis C.|last2=Tokovinin|first2=Andrei|last3=Mason|first3=Brian D.|last4=Riddle|first4=Reed L.|last5=Hartkopf|first5=William I.|last6=Law|first6=Nicholas M.|last7=Baranec|first7=Christoph|journal=The Astronomical Journal|volume=149|issue=4|page=118|bibcode=2015AJ....149..118R|s2cid=30908636}}</ref>
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* *
* *
* * {{Webarchive|url=https://web.archive.org/web/20160220074405/http://www.nasa.gov/jpl/18927/ |date=2016-02-20 }}


{{Stars of Aries}} {{Stars of Aries}}
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Latest revision as of 02:24, 15 November 2024

Multiple star system in the constellation Aries
30 Arietis

30 Arietis star system hierarchy
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
30 Arietis A
Right ascension 02 37 00.5235
Declination +24° 38′ 49.9880″
30 Arietis B
Right ascension 02 36 57.7449
Declination +24° 38′ 53.0026″
Characteristics
Spectral type F5 V / F6 V
B−V color index 0.410 / 0.510
Astrometry
30 Arietis A
Proper motion (μ) RA: 136.862±0.137 mas/yr
Dec.: −15.188±0.141 mas/yr
Parallax (π)22.1261 ± 0.0726 mas
Distance147.4 ± 0.5 ly
(45.2 ± 0.1 pc)
30 Arietis B
Proper motion (μ) RA: 141.411±0.083 mas/yr
Dec.: −10.677±0.086 mas/yr
Parallax (π)22.3641 ± 0.0516 mas
Distance145.8 ± 0.3 ly
(44.7 ± 0.1 pc)
Orbit
Primary30 Arietis A
Companion30 Arietis BC
Period (P)34000 yr
Semi-major axis (a)40"
(1670 AU)
Orbit
Primary30 Arietis B
Companion30 Arietis C
Period (P)80 yr
Semi-major axis (a)22.3 AU
Orbit
Primary30 Arietis B
Companion30 Arietis Bb
Period (P)335.1 ± 2.5 d
(0.917 ± 0.007 yr)
Semi-major axis (a)0.995 ± 0.012 AU
Eccentricity (e)0.289 ± 0.092
Inclination (i)4.14+0.96
−0.90°°
Details
30 Arietis A
Mass1.31 ± 0.04 M☉
Radius1.37 ± 0.03 R☉
Age860±630 Myr
30 Arietis Ba
Mass1.16 ± 0.04 M☉
Radius1.13 ± 0.03 R☉
Age910±830 Myr
Details
30 Arietis Bb
Mass147+41
−29 MJup
Other designations
CCDM 02370+2439, WDS 02370+2439

30 Arietis A
BD+24°376, HD 16246, HIP 12189, HR 765, SAO 75471

30 Arietis B
BD+24°375, HD 16232, HIP 12184, HR 764, SAO 75470
Database references
SIMBADA
B
Exoplanet Archivedata
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

30 Arietis (abbreviated 30 Ari) is a 6th-apparent-magnitude multiple star system in the constellation of Aries. 30 Arietis is the Flamsteed designation. 30 Arietis A and B are separated by 38.1″ or about 1,500 AU at a distance of 130 light years away. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores. The 30 Arietis system is 910 million years old, one fifth the age of the Sun.

Star system

30 Arietis A and B are separated by 38.1", corresponding to 1,500 AU at a distance of 130 light years. The pair are at almost the same distance, have very similar proper motions, and are considered almost certain to be gravitationally bound with a likely period around 34,000 years. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores.

30 Arietis A is a spectroscopic binary with an orbital period of 1.1 days. The primary Aa is an F-type main sequence star about 31% more massive than the Sun, while the companion Ab is a faint red dwarf only about 15% the mass of the Sun.

30 Arietis B has been reported to have a red dwarf companion at a distance of 22 AU and another red dwarf Bb at about 1 AU. In 2020, after the inclination of the planetary orbit was measured, the "planet" was found to fall in the mass range of a brown or red dwarf. The more distant companion was referred to as C to distinguish it from Bb, and at about 0.5" it has been imaged using adaptive optics.

30 Arietis Bb

30 Arietis Bb (sometimes abbreviated 30 Ari Bb) is a red dwarf which orbits the F-type main sequence star 30 Arietis Ba, located in a quintuple star system approximately 146 light years away in the constellation Aries. The red dwarf, initially believed to be a massive planet or brown dwarf, was announced in a paper published online on September 24, 2009. It was discovered by using precision radial velocity measurements from the echelle spectrograph installed on the Alfred-Jensch telescope in Karl Schwarzschild Observatory. The star had a minimum mass of nearly 10 times that of Jupiter. In 2020, after the inclination of the planetary orbit was measured to be just 4.14
−0.90°, the "planet" was found to fall in the mass range of red dwarf stars.

See also

References

  1. ^ 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. ^ 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.
  3. ^ Guenther, E. W.; et al. (2009). "A substellar component orbiting the F-star 30 Arietis B". Astronomy and Astrophysics. 507 (3): 1659–1665. arXiv:0912.4619. Bibcode:2009A&A...507.1659G. doi:10.1051/0004-6361/200912112. S2CID 55685116.
  4. ^ Whitney Clavin (2015). "Planet 'Reared' by Four Parent Stars". NASA. Archived from the original on 4 March 2016. Retrieved 4 March 2015.
  5. ^ Roberts Jr, Lewis C.; Tokovinin, Andrei; Mason, Brian D.; Riddle, Reed L.; Hartkopf, William I.; Law, Nicholas M.; Baranec, Christoph (2015). "Know the Star, Know the Planet. III. Discovery of Late-Type Companions to Two Exoplanet Host Stars". The Astronomical Journal. 149 (4): 118. arXiv:1503.01211. Bibcode:2015AJ....149..118R. doi:10.1088/0004-6256/149/4/118. S2CID 30908636.
  6. ^ Kiefer, F.; et al. (January 2021). "Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets". Astronomy & Astrophysics. 645 A7. arXiv:2009.14164. Bibcode:2021A&A...645A...7K. doi:10.1051/0004-6361/202039168. S2CID 221995447.
  7. Morbey, C. L.; Brosterhus, E. B. (1974). "A Search for Spectroscopic Binaries from Published Radial Velocity Data". Publications of the Astronomical Society of the Pacific. 86 (512): 455. Bibcode:1974PASP...86..455M. doi:10.1086/129630. JSTOR 40675565.
  8. Jean Schneider (2011). "Notes for Planet 30 Ari B b". Extrasolar Planets Encyclopaedia. Retrieved 3 October 2011.

External links

Constellation of Aries
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