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'''AWI0005s3x''' is a 45{{su|b=−7|p=+11}} Myr old <ref>Bell, C. P. M., Mamajek, E. E., & Naylor, T. 2015, MNRAS, 454, 593</ref> [[star]] [[star system|system]] in the [[Carina constellation]] with a [[debris disk]] orbiting an [[stellar classification|M-type]] [[red dwarf]] about 212 [[lightyear]]s from [[Earth]].
'''AWI0005x3s''' is a 45{{su|b=−7|p=+11}} Myr old <ref>{{Cite journal|last=Bell|first=Cameron P. M.|last2=Mamajek|first2=Eric E.|last3=Naylor|first3=Tim|date=2015-11-21|title=A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood|url=https://academic.oup.com/mnras/article/454/1/593/1134330|journal=Monthly Notices of the Royal Astronomical Society|language=en|volume=454|issue=1|pages=593–614|arxiv=1508.05955|doi=10.1093/mnras/stv1981|issn=0035-8711|via=}}</ref> [[star]] [[star system|system]] in the [[Carina constellation]] with a [[debris disk]] orbiting an [[stellar classification|M-type]] [[red dwarf]] about 212 [[lightyear]]s from [[Earth]].


On October 21, 2016, [[NASA]]'s [[Goddard Space Flight Center]] announced that its [[citizen science]] project, [[Disk Detective]], discovered a debris disk around '''WISE J080822.18-644357.3''', a M5.5V dwarf with significant [[infrared]] excess at both 12 and 22 [[Micrometre|μm]]. Classified as [[Disk Detective#Classification|DDOI]] AWI0005x3s, a BANYAN II Bayesian analysis revealed (with 93.9% probability) the star's [[radial velocity]] as 20.6 ± 1.4 [[Kilometre|km]]/[[second|s]], associating it with Carina's ∼45 [[megayear|Myr]] old [[young stellar object|young]] [[proper motion|moving group]]. Since most M dwarf debris disks fade in less than 30 million years, this would be the oldest M dwarf debris disk detected in a moving group, implying a change in understanding of constraint in M dwarf debris disk evolution.<ref>[http://www.nasa.gov/press-release/nasa-citizen-scientists-discover-potential-new-hunting-ground-for-exoplanets "NASA, Citizen Scientists Discover Potential New Hunting Ground for Exoplanets," NASA, release 16-101, 21 October, 2016.]</ref>
On October 21, 2016, [[NASA]]'s [[Goddard Space Flight Center]] announced that its [[citizen science]] project, [[Disk Detective]], discovered a debris disk around '''WISE J080822.18-644357.3''', a M5.5V dwarf with significant [[infrared]] excess at both 12 and 22 [[Micrometre|μm]]. Classified as [[Disk Detective#Classification|DDOI]] AWI0005x3s, a BANYAN II Bayesian analysis revealed (with 93.9% probability) the star's [[radial velocity]] as 20.6 ± 1.4 [[Kilometre|km]]/[[second|s]], associating it with Carina's ∼45 [[megayear|Myr]] old [[young stellar object|young]] [[proper motion|moving group]]. Since most M dwarf debris disks fade in less than 30 million years, this would be the oldest M dwarf debris disk detected in a moving group, implying a change in understanding of constraint in M dwarf debris disk evolution.<ref>[http://www.nasa.gov/press-release/nasa-citizen-scientists-discover-potential-new-hunting-ground-for-exoplanets "NASA, Citizen Scientists Discover Potential New Hunting Ground for Exoplanets," NASA, release 16-101, 21 October, 2016.]</ref><ref>{{Cite journal|last=Silverberg|first=Steven M.|last2=Kuchner|first2=Marc J.|last3=Wisniewski|first3=John P.|last4=Gagné|first4=Jonathan|last5=Bans|first5=Alissa S.|last6=Bhattacharjee|first6=Shambo|last7=Currie|first7=Thayne R.|last8=Debes|first8=John R.|last9=Biggs|first9=Joseph R.|date=14 October 2016|title=A NEW M DWARF DEBRIS DISK CANDIDATE IN A YOUNG MOVING GROUP DISCOVERED WITH DISK DETECTIVE|url=https://doi.org/10.3847%2F2041-8205%2F830%2F2%2Fl28|journal=The Astrophysical Journal|language=en|volume=830|issue=2|pages=L28|arxiv=1610.05293|doi=10.3847/2041-8205/830/2/L28|issn=2041-8205|via=}}</ref>

A follow-up study with an [[Spectroscopy|optical spectrum]] obtained with the [[Siding Spring 2.3 m Telescope|ANU Siding Spring 2.3 meter telescope]] showed a [[Lithium|Li]]-rich M5-star with strong [[H-alpha|Hα]] emission. The data is consistent with a low [[Accretion (astrophysics)|accretion]] of 10<sup>-10</sup> [[Solar mass|M<sub>ʘ</sub>]] yr <sup>-1</sup>.<ref>{{Cite journal|last=Murphy|first=Simon J.|last2=Mamajek|first2=Eric E.|last3=Bell|first3=Cameron P. M.|date=2018-05-21|title=WISE J080822.18−644357.3 – a 45 Myr-old accreting M dwarf hosting a primordial disc|url=https://academic.oup.com/mnras/article/476/3/3290/4898077|journal=Monthly Notices of the Royal Astronomical Society|language=en|volume=476|issue=3|pages=3290–3302|arxiv=1703.04544|doi=10.1093/mnras/sty471|issn=0035-8711|via=}}</ref> [[Atacama Large Millimeter Array|ALMA]] observations did not detect any [[carbon monoxide]], but unresolved 1.3 mm dust emission was detected.<ref>{{Cite journal|last=Flaherty|first=Kevin|last2=Hughes|first2=A. Meredith|last3=Mamajek|first3=Eric E.|last4=Murphy|first4=Simon J.|date=2019-02-13|title=The Planet Formation Potential around a 45 Myr Old Accreting M Dwarf|url=https://iopscience.iop.org/article/10.3847/1538-4357/aaf794|journal=The Astrophysical Journal|volume=872|issue=1|pages=92|arxiv=1812.04124|doi=10.3847/1538-4357/aaf794|issn=1538-4357|via=}}</ref>

There are other examples of low-mass stars and [[Brown dwarf|brown dwarfs]] that show accretion or circumstellar disks and were found in the GAYA (Great Austral Young Association, containing Carina, Columba, Tucana-Horologium<ref>{{Cite web|url=http://aspmonographs.org/custom/publications/paper/005-0757.html|title=Young Nearby Loose Associations - aspmonographs.org|last=Torres|first=C.A.O.|last2=Quast|first2=G.R.|date=|website=aspmonographs.org|arxiv=0808.3362|archive-url=|archive-date=|dead-url=|access-date=2019-07-25|last3=Melo|first3=C.H.F.|last4=Sterzik|first4=M.F.}}</ref>) complex. Examples are 2MASS J0041353-562112 in Tuc-Hor<ref>{{Cite journal|last=Reiners|first=Ansgar|date=21 August 2009|title=EVIDENCE FOR ACCRETION IN A NEARBY, YOUNG BROWN DWARF|url=https://doi.org/10.1088%2F0004-637x%2F702%2F2%2Fl119|journal=The Astrophysical Journal|language=en|volume=702|issue=2|pages=L119–L123|arxiv=0908.3482|doi=10.1088/0004-637X/702/2/L119|issn=1538-4357|via=}}</ref><ref>{{Cite journal|last=Gagné|first=Jonathan|last2=Lafrenière|first2=David|last3=Doyon|first3=René|last4=Malo|first4=Lison|last5=Artigau|first5=Étienne|date=24 February 2014|title=BANYAN. II. VERY LOW MASS AND SUBS℡LAR CANDIDATE MEMBERS TO NEARBY, YOUNG KINEMATIC GROUPS WITH PREVIOUSLY KNOWN SIGNS OF YOUTH|url=https://doi.org/10.1088%2F0004-637x%2F783%2F2%2F121|journal=The Astrophysical Journal|language=en|volume=783|issue=2|pages=121|arxiv=1312.5864|doi=10.1088/0004-637X/783/2/121|issn=0004-637X|via=}}</ref>, 2MASS J05010082-4337102 in Columbia and 2MASS J02265658-5327032 in Tuc-Hor.<ref>{{Cite journal|last=Boucher|first=Anne|last2=Lafrenière|first2=David|last3=Gagné|first3=Jonathan|last4=Malo|first4=Lison|last5=Faherty|first5=Jacqueline K.|last6=Doyon|first6=René|last7=Chen|first7=Christine H.|date=15 November 2016|title=BANYAN. VIII. NEW LOW-MASS STARS AND BROWN DWARFS WITH CANDIDATE CIRCUMS℡LAR DISKS|url=https://doi.org/10.3847%2F0004-637x%2F832%2F1%2F50|journal=The Astrophysical Journal|language=en|volume=832|issue=1|pages=50|arxiv=1608.08259|doi=10.3847/0004-637X/832/1/50|issn=0004-637X|via=}}</ref> The Tuc-Hor association has an age of 45±4 Myr and the Columba association has an age of 42{{su|b=−4|p=+6}} Myr. Together with AWI0005x3s these older low-mass accretors in nearby moving groups are being called [[Peter Pan]] Disks by the Disk Detective collaboration<ref>{{Cite web|url=https://www.nhn.ou.edu/~smsilver/PeterPanDisks.html|title=Low-mass Stars {{!}} Steven M. Silverberg|website=www.nhn.ou.edu|access-date=2019-07-25}}</ref>.


==References==
==References==

Revision as of 11:26, 25 July 2019

AWI0005x3s
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 08h 08m 22.18s
Declination −64° 43′ 57.3″
Distance65.4 +8.8
−7.6 pc
Spectral typeM5.5V
Other designations
WISE J080822.18-644357.3
Database references
SIMBADdata

AWI0005x3s is a 45+11
−7 Myr old [1] star system in the Carina constellation with a debris disk orbiting an M-type red dwarf about 212 lightyears from Earth.

On October 21, 2016, NASA's Goddard Space Flight Center announced that its citizen science project, Disk Detective, discovered a debris disk around WISE J080822.18-644357.3, a M5.5V dwarf with significant infrared excess at both 12 and 22 μm. Classified as DDOI AWI0005x3s, a BANYAN II Bayesian analysis revealed (with 93.9% probability) the star's radial velocity as 20.6 ± 1.4 km/s, associating it with Carina's ∼45 Myr old young moving group. Since most M dwarf debris disks fade in less than 30 million years, this would be the oldest M dwarf debris disk detected in a moving group, implying a change in understanding of constraint in M dwarf debris disk evolution.[2][3]

A follow-up study with an optical spectrum obtained with the ANU Siding Spring 2.3 meter telescope showed a Li-rich M5-star with strong Hα emission. The data is consistent with a low accretion of 10-10 Mʘ yr -1.[4] ALMA observations did not detect any carbon monoxide, but unresolved 1.3 mm dust emission was detected.[5]

There are other examples of low-mass stars and brown dwarfs that show accretion or circumstellar disks and were found in the GAYA (Great Austral Young Association, containing Carina, Columba, Tucana-Horologium[6]) complex. Examples are 2MASS J0041353-562112 in Tuc-Hor[7][8], 2MASS J05010082-4337102 in Columbia and 2MASS J02265658-5327032 in Tuc-Hor.[9] The Tuc-Hor association has an age of 45±4 Myr and the Columba association has an age of 42+6
−4 Myr. Together with AWI0005x3s these older low-mass accretors in nearby moving groups are being called Peter Pan Disks by the Disk Detective collaboration[10].

References

  1. ^ Bell, Cameron P. M.; Mamajek, Eric E.; Naylor, Tim (2015-11-21). "A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 454 (1): 593–614. arXiv:1508.05955. doi:10.1093/mnras/stv1981. ISSN 0035-8711.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  2. ^ "NASA, Citizen Scientists Discover Potential New Hunting Ground for Exoplanets," NASA, release 16-101, 21 October, 2016.
  3. ^ Silverberg, Steven M.; Kuchner, Marc J.; Wisniewski, John P.; Gagné, Jonathan; Bans, Alissa S.; Bhattacharjee, Shambo; Currie, Thayne R.; Debes, John R.; Biggs, Joseph R. (14 October 2016). "A NEW M DWARF DEBRIS DISK CANDIDATE IN A YOUNG MOVING GROUP DISCOVERED WITH DISK DETECTIVE". The Astrophysical Journal. 830 (2): L28. arXiv:1610.05293. doi:10.3847/2041-8205/830/2/L28. ISSN 2041-8205.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  4. ^ Murphy, Simon J.; Mamajek, Eric E.; Bell, Cameron P. M. (2018-05-21). "WISE J080822.18−644357.3 – a 45 Myr-old accreting M dwarf hosting a primordial disc". Monthly Notices of the Royal Astronomical Society. 476 (3): 3290–3302. arXiv:1703.04544. doi:10.1093/mnras/sty471. ISSN 0035-8711.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  5. ^ Flaherty, Kevin; Hughes, A. Meredith; Mamajek, Eric E.; Murphy, Simon J. (2019-02-13). "The Planet Formation Potential around a 45 Myr Old Accreting M Dwarf". The Astrophysical Journal. 872 (1): 92. arXiv:1812.04124. doi:10.3847/1538-4357/aaf794. ISSN 1538-4357.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  6. ^ Torres, C.A.O.; Quast, G.R.; Melo, C.H.F.; Sterzik, M.F. "Young Nearby Loose Associations - aspmonographs.org". aspmonographs.org. arXiv:0808.3362. Retrieved 2019-07-25. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  7. ^ Reiners, Ansgar (21 August 2009). "EVIDENCE FOR ACCRETION IN A NEARBY, YOUNG BROWN DWARF". The Astrophysical Journal. 702 (2): L119 – L123. arXiv:0908.3482. doi:10.1088/0004-637X/702/2/L119. ISSN 1538-4357.
  8. ^ Gagné, Jonathan; Lafrenière, David; Doyon, René; Malo, Lison; Artigau, Étienne (24 February 2014). "BANYAN. II. VERY LOW MASS AND SUBS℡LAR CANDIDATE MEMBERS TO NEARBY, YOUNG KINEMATIC GROUPS WITH PREVIOUSLY KNOWN SIGNS OF YOUTH". The Astrophysical Journal. 783 (2): 121. arXiv:1312.5864. doi:10.1088/0004-637X/783/2/121. ISSN 0004-637X.
  9. ^ Boucher, Anne; Lafrenière, David; Gagné, Jonathan; Malo, Lison; Faherty, Jacqueline K.; Doyon, René; Chen, Christine H. (15 November 2016). "BANYAN. VIII. NEW LOW-MASS STARS AND BROWN DWARFS WITH CANDIDATE CIRCUMS℡LAR DISKS". The Astrophysical Journal. 832 (1): 50. arXiv:1608.08259. doi:10.3847/0004-637X/832/1/50. ISSN 0004-637X.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  10. ^ "Low-mass Stars | Steven M. Silverberg". www.nhn.ou.edu. Retrieved 2019-07-25.


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