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'''OTS 44''' is a free-floating planetary-mass object or [[brown dwarf]] located |
'''OTS 44''' is a free-floating planetary-mass object or [[brown dwarf]] located approximately {{Convert|550|ly|pc}} away in the [[constellation]] [[Chamaeleon]]. It is among the lowest-mass free-floating substellar objects, with approximately 11.5 times the mass of [[Jupiter]], or approximately 1.1% that of the [[Sun]].<ref name=Bonnefoy2014_AA562/><ref>{{cite journal|last1=Luhmann|first1=K. L.|last2=Peterson|first2=D. E.|last3=Megeath|first3=S. T.|title=Spectroscopic Confirmation of the Least Massive Known Brown Dwarf in Chamaeleon|journal=The Astrophysical Journal|volume=617|issue=1|date=2004|doi=10.1086/425228}}</ref> |
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Its radius is not very well known and is estimated to be |
Its radius is not very well known and is estimated to be 23–57% that of the Sun.<ref name=apj620_1_L51/><ref name=joergens2013_AA558/> |
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This brown dwarf is located in the star-forming region Chamaeleon I. Based upon infrared observations with the [[Spitzer Space Telescope]] and the [[Herschel Space Observatory]], OTS 44 emits an [[infrared excess|excess of infrared radiation]] for an object of its type, suggesting it has a circumstellar disk of dust and particles of rock and ice.<ref name=apj620_1_L51/><ref name=joergens2013_AA558/><ref>{{cite web|title=Blurring the lines between stars and planets: Lonely planets offer clues to star formation|url=http://www.mpia.de/Public/menu_q2e.php?Aktuelles/PR/2013/PR_2013_09/PR_2013_09_en.html|website=MPIA Science Release 2013-09|accessdate=1 September 2014}}</ref> This disk has a mass of at least 10 Earth masses.<ref name=joergens2013_AA558/> |
This brown dwarf is located in the star-forming region Chamaeleon I. Based upon infrared observations with the [[Spitzer Space Telescope]] and the [[Herschel Space Observatory]], OTS 44 emits an [[infrared excess|excess of infrared radiation]] for an object of its type, suggesting it has a circumstellar disk of dust and particles of rock and ice.<ref name=apj620_1_L51/><ref name=joergens2013_AA558/><ref>{{cite web|title=Blurring the lines between stars and planets: Lonely planets offer clues to star formation|url=http://www.mpia.de/Public/menu_q2e.php?Aktuelles/PR/2013/PR_2013_09/PR_2013_09_en.html|website=MPIA Science Release 2013-09|accessdate=1 September 2014}}</ref> This disk has a mass of at least 10 Earth masses.<ref name=joergens2013_AA558/> |
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Observations with the SINFONI spectrograph at the [[Very Large Telescope]] show that the disk |
Observations with the SINFONI spectrograph at the [[Very Large Telescope]] show that the disk |
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is accreting matter at the rate of |
is accreting matter at the rate of approximately 10<sup>−11</sup> of the mass of the Sun per year.<ref name=joergens2013_AA558/> It could eventually develop into a [[planetary system]]. |
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==See also== |
==See also== |
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* [[SCR 1845-6357]], a binary system comprising a red dwarf and a brown dwarf |
* [[SCR 1845-6357]], a binary system comprising a red dwarf and a brown dwarf |
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* [[Cha 110913-773444]], an astronomical object |
* [[Cha 110913-773444]], an astronomical object that may be a free-floating planet surrounded by what appears to be a protoplanetary disk |
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==References== |
==References== |
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| |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 11h10m 11.5s |
| Declination | −76° 32′ 13″ |
| Characteristics | |
| Spectral type | M9.5[1] |
| Astrometry | |
| Distance | 554 ly (170 pc) |
| Details | |
| Mass | 0.011[2] M☉ |
| Radius | 0.23[1]–0.57[3] R☉ |
| Luminosity | 0.0013[1]–0.0024[3] L☉ |
| Temperature | 1700[2][3]–2300[1] K |
OTS 44 is a free-floating planetary-mass object or brown dwarf located approximately 550 light-years (170 pc) away in the constellation Chamaeleon. It is among the lowest-mass free-floating substellar objects, with approximately 11.5 times the mass of Jupiter, or approximately 1.1% that of the Sun.[2][4] Its radius is not very well known and is estimated to be 23–57% that of the Sun.[1][3]
This brown dwarf is located in the star-forming region Chamaeleon I. Based upon infrared observations with the Spitzer Space Telescope and the Herschel Space Observatory, OTS 44 emits an excess of infrared radiation for an object of its type, suggesting it has a circumstellar disk of dust and particles of rock and ice.[1][3][5] This disk has a mass of at least 10 Earth masses.[3] Observations with the SINFONI spectrograph at the Very Large Telescope show that the disk is accreting matter at the rate of approximately 10−11 of the mass of the Sun per year.[3] It could eventually develop into a planetary system.
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