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| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Scorpius]]
| constell = [[Scorpius]]
| ra = {{RA|16|02|07.576}}<ref name="UCAC2">{{cite journal |title=VizieR Online Data Catalog: The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2) |journal=CDS/ADC Collection of Electronic Catalogues |first1=N. |last1=Zacharias |first2=S. E. |last2=Urban |first3=M. I. |last3=Zacharias |display-authors=etal |number=1289 |date=2003 |bibcode=2003yCat.1289....0Z}}</ref>
| pronounce = <!--Pronunciation guide-->
| ra = {{RA|16|02|07.576}}
| dec = {{DEC|-22|57|46.89}}<ref name="UCAC2" />
| dec = {{DEC|-22|57|46.89}}
| appmag_v = <!--{{val|p=||}}-->
| appmag_v = <!--{{val|p=||}}-->
}}
}}
{{Starbox character
{{Starbox character
| type = [[Pre-main-sequence star|Pre-main-sequence]]
| type = [[Pre-main-sequence star|Pre-main-sequence]]
| class = M1<ref name="Bouy2009">{{cite journal |title=Proper motions of cool and ultracool candidate members in the Upper Scorpius OB association |journal=Astronomy and Astrophysics |first1=H. |last1=Bouy |first2=Eduardo L. |last2=Martín |volume=504 |issue=3 |pages=981–990 |date=September 2009 |doi=10.1051/0004-6361/200811088 |bibcode=2009A&A...504..981B |arxiv=0907.0149|s2cid=14150392 }}</ref>
| class = [[Red dwarf|M1]]
| appmag_1_passband = R
| appmag_1 = 13.7<ref name="preibisch">{{cite journal |title=Exploring the Full Stellar Population of the Upper Scorpius OB Association |journal=The Astronomical Journal |last1=Preibisch |first1=Thomas |last2=Brown |first2=Anthony G. A. |last3=Bridges |first3=Terry |last4=Guenther |first4=Eike |last5=Zinnecker |first5=Hans |volume=124 |issue=1 |pages=404–416 |date=July 2002 |doi=10.1086/341174 |bibcode=2002AJ....124..404P|doi-access=free }}</ref>
| r-i = <!--R−I color-->
| r-i = <!--R−I color-->
| v-r = <!--V−R color-->
| v-r = <!--V−R color-->
Line 22: Line 23:
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| prop_mo_ra = {{val|-13.5|8.7}}
| prop_mo_ra = -12.267±0.123
| prop_mo_dec = {{val|-20.0|8.8}}
| prop_mo_dec = -24.955±0.069
| parallax = <!--Parallax (in milliarcsec)-->
| parallax = 7.1285
| p_error = <!--Parallax error (in milliarcsec)-->
| p_error = 0.0633
| parallax_footnote = <!--Parallax footnote-->
| parallax_footnote = <ref name=GaiaDR2/>
| dist_ly = <!--Distance (in light years)-->
| dist_ly = <!--Distance (in light years)-->
| dist_pc = <!--Distance (in parsecs)-->
| dist_pc = <!--Distance (in parsecs)-->
| absmag_v =
}}
}}
{{Starbox detail
{{Starbox detail
| mass = 0.5
| mass = 0.5<ref name="EPIC"/>
| radius = 0.97
| radius = 0.97<ref name="EPIC"/>
| luminosity_bolometric = 0.15
| luminosity_bolometric = 0.15<ref name="preibisch"/>
| temperature = 3,673<ref name="preibisch"/>
| age_myr = ≈5
| age_myr = ≈5<ref name="EPIC"/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = [[2MASS]] J16020757-2257467, [[UCAC2]] 22721863, [[USNO]]-B1.0 0670-00406583
| names = [[2MASS]] J16020757-2257467, [[UCAC2]] 22721863, [[USNO]]-B1.0 0670-00406583, Gaia DR2 6243130106031671168
}}
}}
{{Starbox reference
{{Starbox reference
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{{Starbox end}}
{{Starbox end}}


'''EPIC 204278916''' is a [[pre-main-sequence star]], about five million years old and of spectral type [[red dwarf|M1]]. It is part of the Upper Scorpius sub-group of the [[Scorpius–Centaurus Association]], and is in the constellation [[Scorpius]]. The star is approximately the size of the Sun at {{solar radius|0.97}}, but is only half its mass ({{solar mass|0.50}}) and a fraction of its luminosity ({{solar luminosity|0.15}}).<ref name="EPIC">{{cite journal |title=The peculiar dipping events in the disk-bearing young-stellar object EPIC 204278916 |journal=Monthly Notices of the Royal Astronomical Society, Advanced Access |first1=S. |last1=Scaringi |first2=C. F. |last2=Manara |first3=S. A. |last3=Barenfeld |first4=P. J. |last4=Groot |first5=A. |last5=Isella |first6=M. A. |last6=Kenworthy |first7=C. |last7=Knigge |first8=T. J. |last8=Maccarone |first9=L. |last9=Ricci |first10=M. |last10=Ansdell |display-authors=5 |date=August 2016 |doi=10.1093/mnras/stw2155 |bibcode=2016MNRAS.tmp.1267S |arxiv=1608.07291}}</ref><ref name="Phys2016Org">{{cite news |url=http://phys.org/news/2016-08-irregular-dimming-young-stellar-astronomers.html |title=Irregular dimming of a young stellar object investigated by astronomers |work=Phys.org |last=Nowakowski |first=Tomasz |date=30 August 2016 |accessdate=5 September 2016}}</ref>
'''[[Ecliptic Plane Input Catalog|EPIC]] 204278916''' is a [[pre-main-sequence star]], about five million years old with a spectral type of M1, implying a [[red dwarf]]. It is part of the Upper Scorpius sub-group of the [[Scorpius–Centaurus association]], and is in the constellation [[Scorpius]]. The star is approximately the size of the Sun at {{solar radius|0.97}}, but is only half its mass ({{solar mass|0.50}}) and a fraction of its luminosity ({{solar luminosity|0.15}}).<ref name="EPIC">{{cite journal |title=The peculiar dipping events in the disk-bearing young-stellar object EPIC 204278916 |journal= Monthly Notices of the Royal Astronomical Society|volume=463 |issue=2 |first1=S. |last1=Scaringi |first2=C. F. |last2=Manara |first3=S. A. |last3=Barenfeld |first4=P. J. |last4=Groot |first5=A. |last5=Isella |first6=M. A. |last6=Kenworthy |first7=C. |last7=Knigge |first8=T. J. |last8=Maccarone |first9=L. |last9=Ricci |first10=M. |last10=Ansdell |display-authors=5 |at=stw2155 |date=August 2016 |doi=10.1093/mnras/stw2155 |doi-access= free|bibcode=2016MNRAS.463.2265S |arxiv=1608.07291|s2cid=8188464 }}</ref>


This stellar object was first characterized by the 2nd [[USNO CCD Astrograph Catalog]] and the [[2MASS|Two Micron All-Sky Survey]], and was further studied during the ''[[Kepler (spacecraft)|Kepler]]'' space telescope's extended ''K2'' mission Campaign 2 between 23 August and 13 November 2014.
This stellar object was first characterized by the 2nd [[USNO CCD Astrograph Catalog]] and the [[2MASS|Two Micron All-Sky Survey]],<ref name="UCAC2" /><ref name="2MASS">{{cite journal |bibcode=2003yCat.2246....0C |title=VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) |journal=CDS/ADC Collection of Electronic Catalogues |pages=II/246 |volume=2246 |last1=Cutri |first1=Roc M. |last2=Skrutskie |first2=Michael F. |last3=Van Dyk |first3=Schuyler D. |last4=Beichman |first4=Charles A. |last5=Carpenter |first5=John M. |last6=Chester |first6=Thomas |last7=Cambresy |first7=Laurent |last8=Evans |first8=Tracey E. |last9=Fowler |first9=John W. |last10=Gizis |first10=John E. |last11=Howard |first11=Elizabeth V. |last12=Huchra |first12=John P. |last13=Jarrett |first13=Thomas H. |last14=Kopan |first14=Eugene L. |last15=Kirkpatrick |first15=J. Davy |last16=Light |first16=Robert M. |last17=Marsh |first17=Kenneth A. |last18=McCallon |first18=Howard L. |last19=Schneider |first19=Stephen E. |last20=Stiening |first20=Rae |last21=Sykes |first21=Matthew J. |last22=Weinberg |first22=Martin D. |last23=Wheaton |first23=William A. |last24=Wheelock |first24=Sherry L. |last25=Zacarias |first25=N. |year=2003 |url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246 }}</ref> and was further studied during the ''[[Kepler (spacecraft)|Kepler]]'' space telescope's extended ''K2'' mission Campaign 2 between 23 August and 13 November 2014.


== Luminosity ==
==Luminosity==
[[File:EPIC204278916LightCurve.png|thumb|left|A [[light curve]] for EPIC 204278916, adapted from Scaringi ''et al.'' (2016).<ref name="EPIC"/> The inset plot shows the first 25 days of the data shown in the main plot.]]
Research conducted by a team of astronomers, led by Simone Scaringi of the [[Max Planck Institute for Extraterrestrial Physics]] in Germany, found that this [[red dwarf]] star has a resolved [[circumstellar disc]], and luminosity dimmings of up to 65% for 25 consecutive days (out of 79 total observation days) were observed. The variability is highly periodic and attributed to stellar rotation. The researchers hypothesize that the ''irregular'' dimmings are caused by either a warped inner-disk edge or transiting cometary-like objects in either circular or eccentric orbits.<ref name="EPIC" />
In August 2016, a team of astronomers, led by Simone Scaringi of the [[Max Planck Institute for Extraterrestrial Physics]] in Germany, reported that this [[red dwarf]] star has a resolved [[circumstellar disc]]. Further, the research team observed unusual luminosity dimmings of up to 65% for 25 consecutive days (out of 79 total observation days). The variability in luminosity was highly periodic and attributed to stellar rotation. The researchers hypothesized that the ''irregular'' dimmings were caused by either a warped inner-disk edge or transiting cometary-like objects in either circular or eccentric orbits.<ref name="EPIC"/>


==See also==
==See also==
* [[Disrupted planet]]
* [[KIC 8462852]], a star showing similar light fluctuations
* [[List of stars that have unusual dimming periods]]


==References==
==References==
{{reflist}}
{{reflist|refs=
<ref name=GaiaDR2>{{cite DR2|6243130106031671168}}</ref>
}}


==External links==
* [http://archive.stsci.edu/k2/epic/search.php EPIC Catalog at MAST]

{{Extraterrestrial life}}
⚫
{{Stars of Scorpius|state=collapsed}}
{{Portal bar|Astronomy|Space}}
{{Portal bar|Astronomy|Space}}


⚫
[[Category:Astronomical objects discovered in 2016]]
⚫
{{Stars of Scorpius}}
⚫
[[Category:Scorpius]]

⚫
[[Category:Astronomical objects discovered in 2015]]
⚫
[[Category:Scorpius (constellation)]]
[[Category:M-type main-sequence stars]]
[[Category:M-type main-sequence stars]]
[[Category:Pre-main-sequence stars]]
[[Category:Pre-main-sequence stars]]
[[Category:2MASS objects]]
[[Category:2MASS objects|J16020757-2257467]]
[[Category:Upper Scorpius]]

{{reddwarf-star-stub}}

Latest revision as of 01:29, 29 October 2024

EPIC 204278916
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Scorpius
Right ascension 16h 02m 07.576s[1]
Declination −22° 57′ 46.89″[1]
Characteristics
Evolutionary stage Pre-main-sequence
Spectral type M1[2]
Apparent magnitude (R) 13.7[3]
J−H color index 0.712
J−K color index 1.033
Astrometry
Proper motion (μ) RA: -12.267±0.123 mas/yr
Dec.: -24.955±0.069 mas/yr
Parallax (π)7.1285 ± 0.0633 mas[4]
Distance458 ± 4 ly
(140 ± 1 pc)
Details
Mass0.5[5] M☉
Radius0.97[5] R☉
Luminosity (bolometric)0.15[3] L☉
Temperature3,673[3] K
Age≈5[5] Myr
Other designations
2MASS J16020757-2257467, UCAC2 22721863, USNO-B1.0 0670-00406583, Gaia DR2 6243130106031671168
Database references
SIMBADdata

EPIC 204278916 is a pre-main-sequence star, about five million years old with a spectral type of M1, implying a red dwarf. It is part of the Upper Scorpius sub-group of the Scorpius–Centaurus association, and is in the constellation Scorpius. The star is approximately the size of the Sun at 0.97 R☉, but is only half its mass (0.50 M☉) and a fraction of its luminosity (0.15 L☉).[5]

This stellar object was first characterized by the 2nd USNO CCD Astrograph Catalog and the Two Micron All-Sky Survey,[1][6] and was further studied during the Kepler space telescope's extended K2 mission Campaign 2 between 23 August and 13 November 2014.

Luminosity

[edit]
A light curve for EPIC 204278916, adapted from Scaringi et al. (2016).[5] The inset plot shows the first 25 days of the data shown in the main plot.

In August 2016, a team of astronomers, led by Simone Scaringi of the Max Planck Institute for Extraterrestrial Physics in Germany, reported that this red dwarf star has a resolved circumstellar disc. Further, the research team observed unusual luminosity dimmings of up to 65% for 25 consecutive days (out of 79 total observation days). The variability in luminosity was highly periodic and attributed to stellar rotation. The researchers hypothesized that the irregular dimmings were caused by either a warped inner-disk edge or transiting cometary-like objects in either circular or eccentric orbits.[5]

See also

[edit]

References

[edit]
  1. ^ a b c Zacharias, N.; Urban, S. E.; Zacharias, M. I.; et al. (2003). "VizieR Online Data Catalog: The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". CDS/ADC Collection of Electronic Catalogues (1289). Bibcode:2003yCat.1289....0Z.
  2. ^ Bouy, H.; Martín, Eduardo L. (September 2009). "Proper motions of cool and ultracool candidate members in the Upper Scorpius OB association". Astronomy and Astrophysics. 504 (3): 981–990. arXiv:0907.0149. Bibcode:2009A&A...504..981B. doi:10.1051/0004-6361/200811088. S2CID 14150392.
  3. ^ a b c Preibisch, Thomas; Brown, Anthony G. A.; Bridges, Terry; Guenther, Eike; Zinnecker, Hans (July 2002). "Exploring the Full Stellar Population of the Upper Scorpius OB Association". The Astronomical Journal. 124 (1): 404–416. Bibcode:2002AJ....124..404P. doi:10.1086/341174.
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  5. ^ a b c d e f Scaringi, S.; Manara, C. F.; Barenfeld, S. A.; Groot, P. J.; Isella, A.; et al. (August 2016). "The peculiar dipping events in the disk-bearing young-stellar object EPIC 204278916". Monthly Notices of the Royal Astronomical Society. 463 (2). stw2155. arXiv:1608.07291. Bibcode:2016MNRAS.463.2265S. doi:10.1093/mnras/stw2155. S2CID 8188464.
  6. ^ Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
[edit]
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