View source for Astronomy:2MASS J09373487+2931409

{{Short description|T-type brown dwarf in the constellation Leo}}
{{Sky|09|37|34.9|+|29|31|41|19.96}}
{{Starbox begin
|name=2MASS J09373487+2931409}}
{{Starbox observe
|epoch=J2000
|ra={{RA|09|37|34.9}}
|dec={{DEC|29|31|41}}
|constell=[[Astronomy:Leo (constellation)|Leo]]}}
{{Starbox character
|class=T6p
|appmag_1=
|appmag_1_passband=
}}
{{Starbox astrometry
|radial_v=
|prop_mo_ra=944.15 ± 1.24
|prop_mo_dec=−1319.78 ± 1.21
|parallax=163.39
|p_error=1.76
|parallax_footnote={{r|Schilbach2009}}
|absmag_v= }}
{{Starbox detail
|mass_mj=41.56{{±|25.72}}<ref name=Filippazzo2015/>
|radius_rj=0.94{{±|0.16}}<ref name=Filippazzo2015/>
|luminosity=0.000005<ref name=Filippazzo2015>{{citation|arxiv=1508.01767|year=2015|title=Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime|doi=10.1088/0004-637X/810/2/158 |last1=Filippazzo |first1=Joseph C. |last2=Rice |first2=Emily L. |last3=Faherty |first3=Jacqueline |last4=Cruz |first4=Kelle L. |last5=Van Gordon |first5=Mollie M. |last6=Looper |first6=Dagny L. |journal=The Astrophysical Journal |volume=810 |issue=2 |page=158 |s2cid=89611607 }}</ref>
|temperature=881{{±|74}}<ref name=Filippazzo2015/>
|metal=
|rotation=
|rotational_velocity=
|gravity=4.97{{±|0.48}}<ref name=Filippazzo2015/>
|age_gyr=0.5-10<ref name=Filippazzo2015/>
}}
{{Starbox catalog
|names=2MASS J09373487+2931409<br />2MASSI J0937347+293142<br />2MASS 0937+2931}}
{{Starbox reference
|Simbad=2MASS+J09373487%2B2931409
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Leo_constellation_map.svg
|alt=2MASS 0937+2931 is located in the constellation Leo
|caption=Location of 2MASS 0937+2931 in the constellation [[Astronomy:Leo (constellation)|Leo]]|border=infobox|mark=Red_pog.png|width=320
|label=2MASS&nbsp;0937+2931
|lat=87.3
|long=92.5
}}|caption=
}}
{{Starbox end}}

'''2MASS J09373487+2931409''', or '''2MASSI J0937347+293142''' (abbreviated to '''2MASS 0937+2931''') is a [[Astronomy:Brown dwarf|brown dwarf]] of spectral class T6,{{r|Burgasser2002|Simbad}} located in the constellation [[Astronomy:Leo (constellation)|Leo]] about 19.96 [[Astronomy:Light-year|light-year]]s from [[Astronomy:Earth|Earth]].{{r|Schilbach2009}}

==Discovery==
2MASS 0937+2931 was discovered in 2002 by Adam J. Burgasser et al. from [[Astronomy:2MASS|Two Micron All-Sky Survey (2MASS)]], conducted from 1997 to 2001. Follow-up observations were made in 1998–2001 using the Near-Infrared Camera, mounted on the [[Organization:Palomar Observatory|Palomar]] 60 inch (1.5 m) Telescope; CTIO Infrared Imager (CIRIM) and Ohio State Infrared Imager/Spectrometer (OSIRIS), mounted on the Cerro Tololo Inter-American Observatory (CTIO) 1.5 m Telescope; and some additional observations were made using the Near Infrared Camera (NIRC), mounted on the Keck I 10 m telescope, and nearinfrared camera D78, mounted on the [[Organization:Palomar Observatory|Palomar]] 5 m [[Astronomy:Hale Telescope|Hale Telescope]]. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0937+2931. This 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and this discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in [[Astronomy:Sloan Digital Sky Survey|SDSS]] data).{{r|Burgasser2002}}

==Distance==
Currently the most precise distance estimate of 2MASS 0937+2931 is trigonometric parallax, published in 2009 by Schilbach et al.: 163.39 ± 1.76 mas, corresponding to a distance 6.12 ± 0.07 [[Astronomy:Parsec|pc]], or 19.96 ± 0.22 [[Astronomy:Light-year|ly]].{{r|Schilbach2009}} A less precise parallax of this object, measured under U.S. Naval Observatory Infrared Astrometry Program, was published in 2004 by Vrba et al.{{r|Vrba2004}}

==Properties==
2MASS 0937+2931 has an unusual spectrum, indicating a metal-poor atmosphere and/or a high surface gravity (high pressure at the surface).{{r|Burgasser2002}}  Its effective temperature is estimated at about 800 Kelvin. The [[Organization:Research Consortium On Nearby Stars|Research Consortium On Nearby Stars]] (RECONS) estimates the brown dwarf to be 0.03&nbsp;[[Astronomy:Solar mass|solar mass]]es.{{r|RECONS}} No optical variability was detected as in 2014.<ref>{{citation|arxiv=1412.6733|year=2014|title=Weather on Other Worlds. III. A Survey for T Dwarfs with High-Amplitude Optical Variability|doi=10.1088/0004-637X/801/2/104 |last1=Heinze |first1=Aren N. |last2=Metchev |first2=Stanimir |last3=Kellogg |first3=Kendra |journal=The Astrophysical Journal |volume=801 |issue=2 |page=104 |s2cid=119217978 }}</ref>

==See also==
The other 10 brown dwarfs, presented in ''Burgasser et al. (2002)'':<ref name="Burgasser2002"/>
*[[Astronomy:2MASS J02431371-2453298|2MASS 0243-2453]] (T6)
*[[Astronomy:2MASS J04151954-0935066|2MASS 0415-0935]] (T8)
*2MASS 0727+1710 (T7)
*[[Astronomy:List of stars in Leo|List of stars in Leo]]

==References==
{{reflist|colwidth=30em|refs =
<ref name="Simbad">{{cite web
 | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=2MASS+J09373487%2B2931409
 | title=2MASS J09373487+2931409 -- Brown Dwarf (M<0.08solMass)
 | work=[[Astronomy:SIMBAD|SIMBAD]]
 | publisher=Centre de Données astronomiques de Strasbourg
 | access-date=2012-11-26}}</ref>
<ref name="RECONS">{{cite web |website=Research Consortium on Nearby Stars |publisher=[[Organization:Georgia State University|Georgia State University]] |date = January 1, 2012 |title=The 100 nearest star systems |url=http://www.astro.gsu.edu/RECONS/TOP100.posted.htm |access-date = 2012-06-11}}</ref>
<ref name="Burgasser2002">{{cite journal |last1=Burgasser |first1=Adam J. |last2=Kirkpatrick |first2=J. Davy |last3=Brown |first3=Michael E. |author-link3=Michael E. Brown |last4=Reid |first4=I. Neill |last5=Burrows |first5=Adam |last6=Liebert |first6=James |last7=Matthews |first7=Keith |last8=Gizis |first8=John E. |last9=Dahn |first9=Conard C. |last10=Monet |first10=David G. |last11=Cutri |first11=Roc M. |last12=Skrutskie |first12=Michael F. |title=The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification |year=2002 |journal=[[Astronomy:The Astrophysical Journal|The Astrophysical Journal]] |volume=564 |issue=1 |pages=421–451 |arxiv=astro-ph/0108452 |doi=10.1086/324033 |bibcode=2002ApJ...564..421B |s2cid=9273465 }}</ref>
<ref name="Vrba2004">{{cite journal  |last=Vrba |first=F. J.  |author2=Henden, A. A. |author3=Luginbuhl, C. B. |author4=Guetter, H. H. |author5=Munn, J. A. |author6=Canzian, B. |author7=Burgasser, Adam J. |author8=Kirkpatrick, J. Davy |author9=Fan, X. |author10=Geballe, T. R. |author11=Golimowski, D. A. |author12=Knapp, G. R. |author13=Leggett, S. K. |author14=Schneider, D. P. |author15=Brinkmann, J.  |title=Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program  |year=2004  |journal=[[Astronomy:The Astronomical Journal|The Astronomical Journal]]  |volume=127 | issue=5 | pages=2948–2968  |arxiv=astro-ph/0402272  |doi=10.1086/383554  |bibcode=2004AJ....127.2948V|s2cid=16344176 }}</ref>
<ref name="Schilbach2009">{{cite journal  |last=Schilbach |first=E.  |author2=Röser, S. |author3=Scholz, R.-D.  |title=Trigonometric parallaxes of ten ultracool subdwarfs  |year=2009  |journal=Astronomy and Astrophysics  |volume=493 | issue=2 | pages=L27–L30  |arxiv=0811.4136  |doi=10.1051/0004-6361:200811281  |bibcode=2009A&A...493L..27S|s2cid=17774863 }}</ref>
}}

==External links==
* Burgasser et al.: [http://cdsads.u-strasbg.fr/abs/2006ApJ...639.1095B A Method for Determining the Physical Properties of the Coldest Known Brown Dwarfs"]; in: The Astrophysical Journal, Vol.&nbsp;639, Issue&nbsp;2, S.&nbsp;1095ff. (2006)
* Cushing et al.: [http://cdsads.u-strasbg.fr/abs/2006ApJ...648..614C A Spitzer Infrared Spectrograph Spectral Sequence of M, L, and T Dwarfs"]; in: The Astrophysical Journal, Vol.&nbsp;648, Issue&nbsp;1, S.&nbsp;614ff. (2006)

{{Nearest systems|4}}
{{Stars of Leo}}

{{DEFAULTSORT:2MASS J09373487+2931409}}
[[Category:Leo (constellation)]]
[[Category:Brown dwarfs]]
[[Category:2MASS objects|J09373487+2931409]]

{{Sourceattribution|2MASS J09373487+2931409}}