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词条 WD 1145+017
释义

  1. Stellar characteristics

  2. Planetary system

  3. See also

  4. Notes

  5. References

  6. External links

{{sky|11|48|33.63|+|01|28|59.4|567}}{{Starbox begin
| name = WD 1145+017
}}{{Starbox observe
| constell = Virgo[1]
| epoch = J2000.0
| ra = {{RA|11|48|33.63}}[2]
| dec = {{DEC|+01|28|59.4}}[2]
| appmag_v = 17.0[2]
}}{{Starbox character
| class = DB[3]
}}{{Starbox astrometry
| dist_pc = 174.0[2]
| dist_ly = 570[4]
}}{{Starbox detail
| mass = {{val|0.63|0.05}}[8]
| radius = 0.02[5]
| temperature = 15900 ± 500[2]
{{val|15020|520}}[6]
| metal_fe = ~0.1
| age_gyr = {{val|0.224|0.030}}[6]
}}{{Starbox catalog
| names = WD 1145+017,[3] EPIC 201563164[2]
}}{{Starbox reference
| Simbad = EPIC+201563164
}}{{Starbox end}}

WD 1145+017[3] (also known as EPIC 201563164[2]) is a white dwarf approximately {{convert|570|ly|pc}} from Earth in the constellation of Virgo. It is the first white dwarf to be observed with a transiting planetary-mass object orbiting it.

Stellar characteristics

The white dwarf has a mass of 0.6 {{solar mass}}, radius of 0.02 {{solar radius}} (1.4 {{Earth radius}}) and a temperature of 15,900 K, typical for white dwarf stars. It has been a white dwarf for 175 million years.[7] The star included strong absorption lines due to magnesium, aluminium, silicon, calcium, iron and nickel. These elements commonly found in rocky planets are polluting the surface of the star, and would normally be expected to mix through the star and disappear from view after a million years.[7]

Based on recent studies and its mass, the star was likely an early F-type main sequence star (spectral type F0) before it became a red giant.[8]

The apparent magnitude of the star, or how bright it appears from Earth's perspective, is about 17. Therefore, it is too dim to be seen with the naked eye.

Planetary system

{{OrbitboxPlanet begin
| name = WD 1145+017
| table_ref=[2]
}}{{OrbitboxPlanet
| exoplanet = b
| mass_earth = 0.0006678
| period = 0.1875 ± 0.04
| semimajor = ~0.005
| radius_earth = ~0.15
| inclination = ~89
}}{{OrbitboxPlanet disk
| disk = Dusty disk
| periapsis = 0.5?
| apoapsis =
| inclination =
}}{{Orbitbox end}}

The supposed planetesimal, WD 1145+017 b,[2] with a 4.5 hour orbit, is being ripped apart by the star and is a remnant of the former planetary system that the star hosted before becoming a white dwarf. It is the first observation of a planetary object being shredded by a white dwarf. Several other large pieces have been seen in orbit as well. All the various larger pieces have orbits of 4.5 to 4.9 hours. Rocky material is raining down onto the star, and showing up in the star's spectrum. The system was detected by the Kepler space telescope in its extended K2 mission. Though the system was not a target of interest, it was within the field of view of observing sessions, and analysis of the observed data revealed the system.[9][10][11][12]

An excess of infrared radiation indicates that there is a dusty disk with a temperature of {{convert|1150|K|C}}.[7] Supporting observational data, along with data from the Chandra X-ray Observatory, were also found related to dust debris orbiting WD 1145+017.[13]

See also

{{div col|colwidth=30em}}
  • Disrupted planet
  • EPIC 204278916 - star showing unusual light fluctuations
  • Hereford Arizona Observatory
  • KIC 8462852 - star showing unusual light fluctuations
  • 1SWASP J140747.93-394542.6 - star with unusual eclipses corresponding to a ring system
  • PDS 110 - star surrounded with a disk of dust
  • PSR B1919+21 - pulsar mistaken as alien radio signal (LGM-1)
  • Ross 128 - red dwarf star showing unusual radio signals
  • RZ Piscium – star with unusual light fluctuations
{{div col end}}

Notes

{{notelist}}

References

1. ^{{cite news |url= https://www.sciencenews.org/blog/science-ticker/white-dwarf-upsets-planetary-system-consumes-evidence |title= White dwarf upsets planetary system, consumes evidence |author= Christopher Crockett |date= 21 October 2015 }}
2. ^1 2 3 4 5 6 {{cite web |url= http://exoplanet.eu/catalog/wd_1145%2B017_b/ |title= Planet WD 1145+017 b |publisher= The Extrasolar Planet Encyclopedia |accessdate= 30 October 2015 }}
3. ^1 2 3 4 {{cite simbad |title= WD 1145+017 |access-date= 25 October 2015 }}
4. ^{{cite web |url= https://www.cfa.harvard.edu/news/2015-21 |title= Cosmic "Death Star" is Destroying a Planet |date= 21 October 2015 |id= 2015–21 |author= Christine Pulliam |publisher= Harvard-Smithsonian Center for Astrophysics }}
5. ^{{cite journal |title= A disintegrating minor planet transiting a white dwarf |author1=Andrew Vanderburg |author2=John Asher Johnson |author3=Saul Rappaport |author4=Allyson Bieryla |author5=Jonathan Irwin |author6=John Arban Lewis |author7=David Kipping |author8=Warren R. Brown |author9=Patrick Dufour |author10=David R. Ciardi |author11=Ruth Angus |author12=Laura Schaefer |author13=David W. Latham |author14=David Charbonneau |author15=Charles Beichman |author16=Jason Eastman |author17=Nate McCrady |author18=Robert A. Wittenmyer |author19=Jason T. Wright |arxiv= 1510.06387 |bibcode= 2015Natur.526..546V |doi= 10.1038/nature15527 |url= https://www.cfa.harvard.edu/~avanderb/wd1145_017.pdf |date= 11 June 2015 |publicationdate= 22 October 2015 |journal= Nature |volume= 526 |issue=7574 |pages= 546–549 |pmid=26490620}}
6. ^1 2 {{cite journal |last1=Izquierdo |first1=P. |last2=Rodríguez-Gil |first2=P. |last3=Gänsicke |first3=B. T. |last4=Mustill |first4=A. J. |last5=Toloza |first5=O. |last6=Tremblay |first6=P. E. |last7=Wyatt |first7=M. |last8=Chote |first8=P. |last9=Eggl |first9=S. |last10=Farihi |first10=J. |last11=Koester |first11=D. |last12=Lyra |first12=W. |last13=Manser |first13=C. J. |last14=Marsh |first14=T. R. |last15=Pallé |first15=E. |last16=Raddi |first16=R. |last17=Veras |first17=D. |last18=Villaver |first18=E. |last19=Zwart |first19=S. Portegies |title=Fast spectrophotometry of WD 1145+017 |journal=Monthly Notices of the Royal Astronomical Society |pages=2192 |arxiv=1808.07320 |bibcode=2018MNRAS.tmp.2192I |doi=10.1093/mnras/sty2315 |year=2018 }}
7. ^1 2 {{cite journal|title= Multiwavelength Transit Observations of the Candidate Disintegrating Planetesimals Orbiting WD 1145+017 |author1=Bryce Croll |author2=Paul A. Dalba |author3=Andrew Vanderburg |author4=Jason Eastman |author5=Saul Rappaport |author6=John DeVore |author7=Allyson Bieryla |author8=Philip S. Muirhead |author9=Eunkyu Han |author10=David W. Latham |author11=Thomas G. Beatty |author12=Robert A. Wittenmyer |author13=Jason T. Wright |author14=John Asher Johnson |author15=Nate McCrady |arxiv=1510.06434|date= 8 October 2015 |doi=10.3847/1538-4357/836/1/82 |volume=836 |issue=1 |journal=The Astrophysical Journal |page=82|bibcode = 2017ApJ...836...82C |hdl=1721.1/109507 }}
8. ^{{Cite journal|arxiv=1601.05419|last1=Veras|first1=Dimitri|title=Post-main-sequence planetary system evolution|journal=Royal Society Open Science|volume=3|issue=2|pages=150571|year=2016|bibcode=2016RSOS....350571V|doi=10.1098/rsos.150571|pmid=26998326|pmc=4785977}}
9. ^{{cite news |url= http://news.discovery.com/space/astronomy/caught-in-the-act-white-dwarf-is-killing-a-planet-151021.htm |title= Caught in the Act: White Dwarf is Killing a Planet |date= 21 October 2015 |author= Ian O'Neill |publisher= Discovery Channel }}
10. ^{{cite news |url= http://news.nationalgeographic.com/2015/10/151021-zombie-dead-star-eats-asteroid-astronomy/ |title= Zombie Star Caught Feasting On Asteroids |author= Michael D. Lemonick |date= 21 October 2015 |publisher= National Geographic }}
11. ^{{cite news |url= http://www.sci-news.com/astronomy/science-kepler-wd-1145-017-white-dwarf-03366.html |title= NASA’s Kepler K2 Mission Discovers Planet-Destroying White Dwarf Star |date= 22 October 2015 |publisher= Sci-News.com }}
12. ^{{cite news |url= http://www.skyandtelescope.com/astronomy-news/white-dwarf-eats-planet2610201523/ |title= White Dwarf Eats Mini Planet? |author= Camille M. Carlisle |date= 26 October 2015 |publisher= Sky and Telescope }}
13. ^{{Cite journal|last1=Rappaport |first1=S. |last2=Gary |first2=B.L. |last3=Vanderburg |first3=A. |last4=Xu |first4=S. |last5=Pooley |first5=D. |last6=Mukai |first6=K. |title=WD 1145+017: Optical Activity During 2016-2017 and Limits on the X-Ray Flux |journal=Monthly Notices of the Royal Astronomical Society |volume=474 |issue=1 |pages=933 |date=24 September 2017 |arxiv=1709.08195 |doi=10.1093/mnras/stx2663 |bibcode=2018MNRAS.474..933R }}

External links

  • Harvard Center for Astrophysics, [https://www.cfa.harvard.edu/~avanderb/k2c1/ep201563164.html EPIC 201563164]
  • AstronomyNow, [https://astronomynow.com/tag/wd-1145017/ WD 1145+017]
  • AmericaSpace, WD 1145+017

2 : White dwarfs|Virgo (constellation)
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