{{Short description|Binary star system in the constellation Taurus}} {{Starbox begin | name = UX Tauri }} {{Starbox image |image=250px |caption=An artist's conception of a circumstellar disk around UX Tauri A, along with several hypothetical protoplanets }} {{Starbox observe | epoch = J2000.0 | constell = Taurus<ref>{{cite constellation|UX Tauri}}</ref> | ra = {{RA|04|30|03.99626}}<ref name="van Leeuwen2007">{{cite journal |title=Validation of the new Hipparcos reduction |last=van Leeuwen |first=F. |journal=Astronomy and Astrophysics |volume=474 |issue=2 |pages=653–664 |date=2007 |arxiv=0708.1752 |bibcode=2007A&A...474..653V |doi=10.1051/0004-6361:20078357 |s2cid=18759600 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=14774 Vizier catalog entry ] {{Webarchive|url=https://web.archive.org/web/20190402114112/https://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%26A...474..653VFUL |date=2019-04-02 }}</ref> | dec = {{DEC|+18|13|49.4355}}<ref name="van Leeuwen2007"/> | appmag_v = 10.5 - 13.9<ref name=vsx>{{cite web |url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=35054 |title=UX Tau |website=International Variable Star Index |access-date=2025-04-30 }}</ref> }} {{Starbox character | class = K2Ve + M1Ve<ref>{{cite journal |last=Herbig |first=G. H. |date=1977 |title=Radial velocities and spectral types of T Tauri stars |journal=Astrophysical Journal |volume=214 |pages=747–758 |bibcode=1977ApJ...214..747H |doi=10.1086/155304 |doi-access=free }}</ref> | variable = T Tau<ref name=gcvs>{{cite journal |bibcode=2017ARep...61...80S |title=General catalogue of variable stars: Version GCVS 5.1 |last1=Samus' |first1=N. N. |last2=Kazarovets |first2=E. V. |last3=Durlevich |first3=O. V. |last4=Kireeva |first4=N. N. |last5=Pastukhova |first5=E. N. |journal=Astronomy Reports |date=2017 |volume=61 |issue=1 |page=80 |doi=10.1134/S1063772917010085 }}</ref> }} {{Starbox astrometry | radial_v=22.90<ref name=RV>{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|last=Gontcharov |first=G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053|s2cid=119231169}}</ref> | prop_mo_ra=17.18 | prop_mo_dec=-21.91 | pm_footnote = <ref name="van Leeuwen2007"/> | parallax = -3.70 | p_error = 5.73 | parallax_footnote = <ref name="van Leeuwen2007"/> | dist_ly = {{Convert|139.4|±|2.0|pc|ly|disp=number}} | dist_pc = {{val|139.4|2.0}}<ref name=Mendigutia2026/> | dist_footnote = }} {{Starbox detail | source = | component1 = UX Tauri A | mass = {{Val|2.34|0.29|0.43}}<ref name=Mendigutia2026/> | radius = {{solar radius calculator|type=logLT|0.95|5490|decimals=1}}<ref name=Mendigutia2026/>{{Efn|name=radius1|1=Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of {{val|fmt=commas|5,772|ul=K}}:<math display="block">\sqrt{\biggl(\frac{5,772}{5,490}\biggr)^4 \cdot 10^{0.95}} = 3.3\ R_\odot.</math>}} | temperature = {{Val|5490|130|210|fmt=commas}}<ref name=Mendigutia2026/> | luminosity = {{Val|8.9|3.7|2.5}}<ref name=Mendigutia2026/> | gravity = {{Val|3.77|0.17}}<ref name=Mendigutia2026/> | metal_fe = {{val|+0.02|0.02}}<ref name=Mendigutia2026/> | rotation = {{val|5.0|0.9}}<ref name=Mendigutia2026/> days | rotational_velocity = {{Val|128|12}}<ref name=Mendigutia2026/> | age_myr = {{Val|1.26|1.03|0.63}}<ref name=Mendigutia2026/> | component2 = UX Tauri B | mass2 = 0.4<ref name=Magazzu1991>{{cite journal|last=Magazzu |first=A. |date=1991|title=Lithium in the pre-main sequence triple system UX Tauri|journal=Astronomy and Astrophysics|volume=249|number=1|pages=149–155|bibcode=1991A&A...249..149M }}</ref> | radius2 = {{solar radius calculator|type=LT|0.5|3500|decimals=1}}<ref name=Magazzu1991/>{{Efn|name=radius2|1=Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of {{val|fmt=commas|5,772|ul=K}}:<math display="block">\sqrt{\biggl(\frac{5,772}{3,500}\biggr)^4 \cdot 0.5} = 1.9\ R_\odot.</math>}} | temperature2 = 3,500<ref name=Magazzu1991/> | luminosity2 = 0.5<ref name=Magazzu1991/> | gravity2 = 3.5<ref name=Magazzu1991/> | age_myr2 = 1<ref name=Magazzu1991/> }} {{Starbox catalog |names=UX Tau, HD 285846, HIP 20990, WDS J04301+1814AB, CCDM J04301+1814AB, 1RXS J043004.5+181342<ref name="SIMBAD">{{cite simbad | title=UX Tau | access-date=5 December 2016}}</ref> }} {{Starbox reference |Simbad=UX+Tau}} {{Starbox end}} __NOTOC__ [[File:UXTauLightCurve.png|thumb|left|A visual-band light curve for UX Tauri, plotted from ''ASAS-SN'' data<ref name="ASAS-SN"/>]] '''UX Tauri''', abbreviated as '''UX Tau''', is a binary star system approximately 450 light-years away in the constellation of Taurus (the Bull). It is notable for the fact that, despite its recent (in stellar terms) creation, the Spitzer Space Telescope discovered that its protoplanetary disk contains a gap. The dust, which normally accumulates in an expanding ring starting right next to the star at such a young age, is either very thin or nonexistent at a range of 0.2 to 56 AU from the star. Typically, this means that the early ancestors of planets may be forming from the disk, though the star only ignited about 1 million years ago.<ref>{{Cite web |url=http://www.nasa.gov/mission_pages/spitzer/news/spitzer-20071128.html |title=NASA - Youthful Star Sprouts Planets Early<!-- Bot generated title --> |access-date=2007-11-28 |archive-date=2012-10-21 |archive-url=https://web.archive.org/web/20121021170908/http://www.nasa.gov/mission_pages/spitzer/news/spitzer-20071128.html |url-status=dead }}</ref> In contrast, Earth was formed approximately 4.54 billion years ago, placing its formation about sixty million years after the Sun's ignition around 4.6 billion years ago. {{clear left}} ==See also== * HD 98800 * Vega * V4046 Sagittarii
==Notes== {{notelist}}
==References== <references> <ref name="ASAS-SN">{{cite web |url=https://asas-sn.osu.edu/variables/lookup |website=ASAS-SN Variable Stars Database|title=ASAS-SN Variable Stars Database|publisher=ASAS-SN |access-date=6 January 2022}}</ref>
<ref name=Mendigutia2026>{{Cite journal |last=Mendigutía |first=I. |last2=Campbell-White |first2=J. |last3=Montesinos |first3=B. |last4=Maldonado |first4=J. |last5=Fullana-García |first5=L. |last6=Mirouh |first6=G. M. |last7=Meeus |first7=G. |last8=Vioque |first8=M. |last9=Sicilia-Aguilar |first9=A. |last10=Zapatero-Osorio |first10=M. R. |last11=Villaver |first11=E. |last12=Kahar |first12=R. |date=2026-04-06 |title=Lithium and the evolution of intermediate-mass T Tauri and Herbig stars. Rotation, accretion, and planets |journal=Astronomy & Astrophysics |doi=10.1051/0004-6361/202659302 |arxiv=2604.05040 |issn=0004-6361}}</ref> </references>
==External links== * {{Cite journal |journal=Astronomy and Astrophysics |bibcode=1991A&A...249..149M |title=Lithium in the pre-main sequence triple system UX Tauri |date=September 1991 |volume=249 |issue=1 |author=Magazzu, A. |author2=Martin, E. L. |author3=Rebolo, R.|page=149 }} * {{cite web |url=http://jumk.de/astronomie/exoplanets/ux-tauri.shtml |title=UX Tauri |access-date=2008-06-16 |work=Jumk.de}}
{{Stars of Taurus}}
Category:Circumstellar disks Category:Binary stars Category:T Tauri stars Category:Taurus (constellation) Category:Hypothetical planetary systems Tauri, UX Category:K-type main-sequence stars Category:M-type main-sequence stars Category:Emission-line stars 285846 020990
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