View source for Astronomy:DENIS 0255−4700

{{Short description|Star in the constellation Eridanus}}
{{Sky|02|55|03.579|−|47|00|50.99|15.88}}
{{Starbox begin |
name=DENIS 0255−4700 }}
{{Starbox image 
| image = [[File:L-dwarf-nasa-hurt.png|300px]]
| caption = Artist's impression of an L-dwarf
}} 
{{Starbox observe |
  epoch=J2000 
| ra = {{RA|02|55|03.579}}<ref name="SIMBAD" />
| dec = {{DEC|−47|00|50.99}}<ref name="SIMBAD" />
| constell=[[Astronomy:Eridanus (constellation)|Eridanus]] }}
{{Starbox character |
class=L8/L9<ref name=Stephens2009/> |
appmag_1_passband = V<!-- Passband for first apparent magnitude (e.g., H, J, K, etc.) --> |
appmag_1 = ~22.9<ref name="SIMBAD" /><!-- Value of first apparent magnitude  --> |
appmag_2_passband = R<!-- Passband for first apparent magnitude (e.g., H, J, K, etc.) --> |
appmag_2 = ~20.1<ref name="SIMBAD" /><!-- Value of first apparent magnitude  --> |
appmag_3_passband = I<!-- Passband for second apparent magnitude (e.g., H, J, K, etc.) --> |
appmag_3 = ~17.2<ref name="SIMBAD" /><!-- Value of second apparent magnitude  --> |
appmag_4_passband = J<!-- Passband for first apparent magnitude (e.g., H, J, K, etc.) --> |
appmag_4 = ~13.2<ref name="SIMBAD" /><!-- Value of third apparent magnitude  --> |
  b-v= |
  u-b= |
 r-i = |
 v-r = |
  variable= }}
{{Starbox astrometry
| radial_v=
| prop_mo_ra=1053 ± 11<ref name="SIMBAD" />
| prop_mo_dec= −547 ± 6<ref name="SIMBAD" />
| parallax=205.4251
| p_error= 0.1857
| parallax_footnote= <ref name="GaiaEDR3">{{Cite Gaia EDR3|4752399493622045696}}</ref>
| absmag_v=24.44
}}
{{Starbox detail|
  mass= 0.025–0.065<ref name=Stephens2009/> |
  radius=0.08–0.1<ref name=Stephens2009/> |
  luminosity= 0.0000154<ref>[https://www.aanda.org/articles/aa/pdf/2020/10/aa38295-20.pdf CARMENES input catalogue of M dwarfs V. Luminosities, colours, and spectral energy distributions]</ref>| 
  temperature= ~1300<ref name=Stephens2009/> |
  metal= |
  rotation=1.7 hours<ref name=Osorio2006/> |
rotational_velocity=40.8{{±|8.0}}<ref name=Osorio2006>{{citation|arxiv=astro-ph/0603194|year=2006|title=Spectroscopic Rotational Velocities of Brown Dwarfs|doi=10.1086/505484 |last1=Zapatero Osorio |first1=M. R. |last2=Martin |first2=E. L. |last3=Bouy |first3=H. |last4=Tata |first4=R. |last5=Deshpande |first5=R. |last6=Wainscoat |first6=R. J. |journal=The Astrophysical Journal |volume=647 |issue=2 |pages=1405–1412 |bibcode=2006ApJ...647.1405Z |s2cid=14358043 }}</ref>|
  age_gyr=0.3–10<ref name=Stephens2009/> }}
{{Starbox catalog |
  names= [[Astronomy:Gliese Catalogue of Nearby Stars|GJ]] 10402<ref name="CNS5"/>,2MUCD 10158, <br>DENIS-P J025503.3−470049,<br> [[Astronomy:2MASS|2MASS]] J02550357−4700509,<br> DENIS-P J025503.5−470050,<br> DENIS-P J0255.0−4700,<br> 2MASSI 0255035−470050 }}
{{Starbox reference |
  Simbad=DENIS-P+J0255.0-4700
| ARICNS =  }}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Eridanus_constellation_map.svg
|alt=DENIS 0255−4700 is located in the constellation Eridanus.
|caption=Location of DENIS 0255−4700 in the constellation [[Astronomy:Eridanus (constellation)|Eridanus]]|border=infobox|mark=Red_pog.png|width=300
|label=DENIS&nbsp;0255−4700
|position=top
|lat=23.3
|long=66.8
}}|caption=
}}
{{Starbox end}}

'''DENIS 0255−4700''' is an extremely faint [[Astronomy:Brown dwarf|brown dwarf]] approximately 16 light years from the [[Astronomy:Solar System|Solar System]] in the southern [[Astronomy:Constellation|constellation]] of [[Astronomy:Eridanus (constellation)|Eridanus]].<ref name="SIMBAD">{{cite web
 | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=DENIS-P+J0255.0-4700
 | title=2MUCD 10158 – Brown Dwarf (M<0.08 {{solar mass}}) 
 | publisher=[[Organization:Centre de données astronomiques de Strasbourg|Centre de données astronomiques de Strasbourg]]
 | access-date=2009-12-14 }}</ref><ref name=RECONS2>{{cite web
| url=http://www.astro.gsu.edu/RECONS/press.2006.08.html |title = Discovery of the Nearest L Dwarf: the Intrinsically Faintest Object at Visual Wavelengths Known Beyond our Solar System | publisher=RECONS | access-date=2007-06-17}}</ref> It is the closest isolated L brown dwarf (no undiscovered L-dwarfs are expected to be closer), and only after the binary [[Astronomy:Luhman 16|Luhman 16]]. It is also the faintest brown dwarf (with the absolute magnitude of M<sub>V</sub>=24.44) having measured visible magnitude.<ref name=Costa2006/> A number of nearer T and Y-type dwarfs are known, specifically [[Astronomy:WISE 0855−0714|WISE 0855−0714]], [[Astronomy:Epsilon Indi|Epsilon Indi]] B and C, [[Astronomy:SCR 1845-6357|SCR 1845-6357]] B, [[Astronomy:DEN 1048−3956|DEN 1048−3956]], and [[Astronomy:UGPS J0722−0540|UGPS 0722−05]].

==History of observations==
DENIS 0255−4700 was identified for the first time as a probable nearby object in 1999.<ref name=RECONS2/> Its proximity to the Solar System was established by the RECONS group in 2006 when its trigonometric parallax was measured.<ref name=Costa2006>{{Cite journal | last1 = Costa | first1 = E. | last2 = Méndez | first2 = R. A. | last3 = Jao | first3 = W. -C. | last4 = Henry | first4 = T. J. | last5 = Subasavage | first5 = J. P. | last6 = Ianna | first6 = P. A. | doi = 10.1086/505706 | title = The Solar Neighborhood. XVI. Parallaxes from CTIOPI: Final Results from the 1.5 m Telescope Program | journal = The Astronomical Journal | volume = 132 | issue = 3 | pages = 1234 | year = 2006 |bibcode = 2006AJ....132.1234C | citeseerx = 10.1.1.622.2310 | s2cid = 18952940 }}</ref> DENIS 0255-4700 has a relatively small tangential velocity of {{nowrap|27.0 ± 0.5 km/s}}.<ref name=Stephens2009/>

==Properties==
The photospheric temperature of DENIS 0255−4700 is estimated at about 1300&nbsp;K.<ref name=Stephens2009>{{Cite journal |last1=Stephens |first1=Denise C. |last2=Leggett |first2=Sandy K. |last3=Cushing |first3=Michael C. |last4=Marley |first4=Mark S. |last5=Saumon |first5=Didier |last6=Geballe |first6=Thomas R. |last7=Golimowski |first7=David A. |last8=Fan |first8=Xiaohui |last9=Noll |first9=Keith S. |title=The 0.8–14.5 μm Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity |doi=10.1088/0004-637X/702/1/154 |journal=The Astrophysical Journal |volume=702 |issue=1 |pages=154–170 |year=2009 |arxiv=0906.2991 |bibcode=2009ApJ...702..154S |s2cid=118650774 }}</ref> Its atmosphere in addition to hydrogen and helium contains water vapor, [[Chemistry:Methane|methane]] and possibly [[Chemistry:Ammonia|ammonia]].<ref name=Cushing2006>{{cite journal|first=Michael C. |last=Cushing|title=Spitzer Space Telescope Observations of M, L, and T Dwarfs|year=2006|bibcode=2006ASPC..357...66C|journal=ASP Conference Series|volume=357|pages=66–67}}</ref> The mass of DENIS 0255−4700 lies in the range from 25 to 65 [[Astronomy:Jupiter mass|Jupiter mass]]es corresponding to the age range from 0.3 to 10 billion years.<ref name=Stephens2009/> The brown dwarf is rotating rapidly with the period of 1.7 hours, and its rotational axis is inclined 40 degrees from the line-of-sight.<ref name=Osorio2006/>
<ref name="CNS5">{{cite journal |arxiv=2211.01449 |last1=Golovin |first1=Alex |last2=Reffert |first2=Sabine |last3=Just |first3=Andreas |last4=Jordan |first4=Stefan |last5=Vani |first5=Akash |last6=Jahreiß |first6=Hartmut |title=The Fifth Catalogue of Nearby Stars (CNS5) |date=November 2022 |journal=Astronomy & Astrophysics |volume=670 |issue= |pages=A19 |doi=10.1051/0004-6361/202244250 |bibcode=2023A&A...670A..19G|s2cid=253264922 }} Catalogue can be accessed [https://dc.g-vo.org/CNS5 here].</ref>

==See also==
*[[Astronomy:List of nearest stars and brown dwarfs|List of nearest stars and brown dwarfs]]
*[[Astronomy:List of brown dwarfs|List of brown dwarfs]]
*[[Organization:Research Consortium On Nearby Stars|Research Consortium On Nearby Stars]]

==References==
{{reflist}}

==Notes==
{{reflist|group=nb}}

==External links==
* [http://www.astro.gsu.edu/RECONS/TOP100.posted.htm RECONS List of the 100 nearest stars]
{{Nearest star systems|4}}

{{DEFAULTSORT:DEN 0255-4700}}
[[Category:Eridanus (constellation)]]
[[Category:Brown dwarfs]]
[[Category:DENIS objects]]
[[Category:2MASS objects|J02550357-4700509]]



{{Sourceattribution|DENIS 0255−4700}}