View source for 2MASS J08381155+1511155

{{short description|2M0838+15 is a triple brown dwarf}}
{{Starbox begin
| name = 2M0838+15
}}
{{Starbox image
| image = [[File:2M0838+15ABC Keck NIRC2.jpg|250px]]
| caption = Keck Observatory image of 2M0838+15ABC
| credit = <!--credit for image if the image's use requires them (optional)-->
}}
{{Starbox observe
| epoch = J2000
| equinox = J2000
| constell = [[Cancer (constellation)|Cancer]]
| ra = {{RA|08|38|11.55}}
| dec = {{Dec|+15|11|15.51}}
}}
{{Starbox character
| type = brown dwarf
| class = T3+T3+T4.5<ref name="Radigan2013"/>
}}
{{Starbox astrometry
| radial_v           =   <!--Radial velocity (in km/sec)-->
| prop_mo_ra         =   -139.0 ±1.9
| prop_mo_dec        =   5.9 ±1.8
| pm_footnote        =   <ref name="Best2018"/>
| dist_ly            =   160 ±39
| dist_pc            =   49 ±12
| dist_footnote      =   <ref name="Radigan2013"/>
}}
{{Starbox detail
| source                 =   <ref name="Radigan2013"/>
| component1             =   2M0838+15A
| mass_mj = 63 ±9
| component2             =   2M0838+15B
| mass_mj2 = 58 ±8
}}
{{Starbox detail|no_heading=y
| component             =   2M0838+15C
| mass_mj = 52 ±8
}}
{{Starbox relpos
| reference = <ref name="Radigan2013"/>
| epoch = 2010 January 8
| primary = 2M0838+15A
| component = 2M0838+15(BC)
| angdistmas = 549 ±1
| posang = 18.8 ±0.1
| projsep = 27 ±5
}}
{{Starbox relpos
| reference = <ref name="Radigan2013"/>
| epoch = 2010 January 8
| primary = 2M0838+15B
| component = 2M0838+15C
| angdistmas = 50.2 ±0.5
| posang = -6 ± 2
| projsep = 2.5 ±0.5
}}
{{Starbox catalog
| names      =[[2MASS]]&nbsp;J08381155+1511155, [[Ecliptic Plane Input Catalog|EPIC]]&nbsp;211646606, [[Sloan Digital Sky Survey|SDSS]]&nbsp;J083811.45+151115.5, [[TESS Input Catalog|TIC]]&nbsp;21274825, [[Wide-field Infrared Survey Explorer|WISEA]]&nbsp;J083811.44+151115.0, WISE&nbsp;J083811.44+151115.1
}}
{{Starbox reference
| Simbad =2MASS+J08381155%2B1511155
}}
{{starbox end}}
'''2M0838+15''' (also known as '''2MASS J08381155+1511155''') is a [[Star system|triple]] [[brown dwarf]] with all three components being [[T dwarf|T dwarfs]]. It was the first fully resolved triple T-type brown dwarf system that was discovered.<ref name="Radigan2013"/>
== Description ==
2M0838+15 was discovered in a cross-match of [[2MASS]] and [[Wide-field Infrared Survey Explorer|WISE]] as a possible T6-T7 dwarf.<ref name="Aberasturi2011"/> An unresolved spectrum with [[NASA Infrared Telescope Facility|NASA IRTF]] was obtained. Follow-up imaging observations with [[W. M. Keck Observatory|Keck]] NIRC2 showed that this system is a triple system. Follow-up observations with Keck/OSIRIS resulted in resolved spectrum of the A and the BC components. The spectrum for component A matches a T3 ±1 spectral type. The BC spectrum matches a combined spectral type, which is composed of T3 ± 1 (B), and T4.5 ± 1 (C). Follow-up imaging showed that the triple has a common [[proper motion]]. Components BC have a relative small separation of around 2.5 [[astronomical unit|AU]] and should have an orbital period of around 12 or 21 years. This could mean that in the future the masses can be measured for both components by using the dynamical mass method. For an age of 3 billion years the researchers estimate masses of 63+58+52 {{jupiter mass|link=true}}, and for an age of 300 million years the researchers estimate masses of 21+19+17 {{jupiter mass}}. The researchers find that for an age of 3 billion years the system would have a [[gravitational binding energy]] of about 20 × 10<sup>41</sup> [[erg]]. This would be high enough for the system to survive a dynamical ejection from a [[star-forming region]]. For an age of 300 million years, the gravitational binding energy is about 1.6 × 10<sup>41</sup> erg, which would make it a rare weakly bound triple. The researchers conclude that it is less likely that 2M0838+15 is young.<ref name="Radigan2013"/>
== See also ==
other triple brown dwarfs:
* [[DENIS-P J020529.0−115925]]
* [[2M1510]] includes eclipsing binary pair
* [[VHS J1256–1257]]
* [[2MASSW J0920122+351742|2MASS J0920+3517]]
== References ==
{{reflist |refs=
<ref name="Radigan2013">{{Cite journal |last1=Radigan |first1=Jacqueline |last2=Jayawardhana |first2=Ray |last3=Lafrenière |first3=David |last4=Dupuy |first4=Trent J. |last5=Liu |first5=Michael C. |last6=Scholz |first6=Alexander |date=2013-11-01 |title=Discovery of a Visual T-dwarf Triple System and Binarity at the L/T Transition |url=https://ui.adsabs.harvard.edu/abs/2013ApJ...778...36R/abstract |journal=The Astrophysical Journal |volume=778 |issue=1 |pages=36 |arxiv=1308.5702 |bibcode=2013ApJ...778...36R |doi=10.1088/0004-637X/778/1/36 |hdl=10023/5496 |issn=0004-637X}}</ref>
<ref name="Aberasturi2011">{{Cite journal |last1=Aberasturi |first1=M. |last2=Solano |first2=E. |last3=Martín |first3=E. L. |date=2011-10-01 |title=WISE/2MASS-SDSS brown dwarfs candidates using Virtual Observatory tools |url=https://ui.adsabs.harvard.edu/abs/2011A&A...534L...7A/abstract |journal=Astronomy and Astrophysics |volume=534 |pages=L7 |arxiv=1108.1724 |bibcode=2011A&A...534L...7A |doi=10.1051/0004-6361/201117822 |issn=0004-6361}}</ref>
<ref name="Best2018">{{Cite journal |last1=Best |first1=William M. J. |last2=Magnier |first2=Eugene A. |last3=Liu |first3=Michael C. |last4=Aller |first4=Kimberly M. |last5=Zhang |first5=Zhoujian |last6=Burgett |first6=W. S. |last7=Chambers |first7=K. C. |last8=Draper |first8=P. |last9=Flewelling |first9=H. |last10=Kaiser |first10=N. |last11=Kudritzki |first11=R. -P. |last12=Metcalfe |first12=N. |last13=Tonry |first13=J. L. |last14=Wainscoat |first14=R. J. |last15=Waters |first15=C. |date=2018-01-01 |title=Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3π Survey |journal=The Astrophysical Journal Supplement Series |volume=234 |issue=1 |pages=1 |arxiv=1701.00490 |bibcode=2018ApJS..234....1B |doi=10.3847/1538-4365/aa9982 |doi-access=free |issn=0067-0049}}</ref>
}}
[[Category:Triple star systems]]
[[Category:T-type brown dwarfs]]
[[Category:Cancer (constellation)]]
[[Category:Astronomical objects discovered in 2011]]