Proplyd

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Proplyds in the Orion Nebula Orion Nebula with proplyd highlights (captured by the Hubble Space Telescope).jpg
Proplyds in the Orion Nebula

A proplyd, short for ionized protoplanetary disk, is an externally illuminated photoevaporating protoplanetary disk around a young star. Nearly 180 proplyds have been discovered in the Orion Nebula. [1] Images of proplyds in other star-forming regions are rare, while Orion is the only region with a large known sample due to its relative proximity to Earth. [2]

Contents

History

In 1979 observations with the Lallemand electronic camera at the Pic-du-Midi Observatory showed six unresolved high-ionization sources near the Trapezium Cluster. These sources were not interpreted as proplyds, but as partly ionized globules (PIGs). The idea was that these objects are being ionized from the outside by M42. [3] Later observations with the Very Large Array showed solar-system-sized condensations associated with these sources. Here the idea appeared that these objects might be low-mass stars surrounded by an evaporating protostellar accretion disk. [4]

Proplyds were clearly resolved in 1993 using images of the Hubble Space Telescope Wide Field Camera and the term "proplyd" was used. [5]

Characteristics

Illustration of the dynamics of a proplyd, including an astrophysical jet Opo0113i.jpg
Illustration of the dynamics of a proplyd, including an astrophysical jet
Components of proplyd 177-341W in the Orion Nebula observed with VLT MUSE, showing an ionization front, protoplanetary disk, and tail 177-341W collage Aru et al 2024.png
Components of proplyd 177-341W in the Orion Nebula observed with VLT MUSE, showing an ionization front, protoplanetary disk, and tail

In the Orion Nebula the proplyds observed are usually one of two types. Some proplyds glow around luminous stars, in cases where the disk is found close to the star, glowing from the star's luminosity. Other proplyds are found at a greater distance from the host star and instead show up as dark silhouettes due to the self-obscuration of cooler dust and gases from the disk itself. Some proplyds show signs of movement from solar irradiance shock waves pushing the proplyds. The Orion Nebula is approximately 1,500 light-years from the Sun with very active star formation. The Orion Nebula and the Sun are in the same spiral arm of the Milky Way galaxy. [7] [8] [9] [10]

A proplyd may form new planets and planetesimal systems. Current models show that the metallicity of the star and proplyd, along with the correct planetary system temperature and distance from the star, are keys to planet and planetesimal formation. To date, the Solar System, with 8 planets, 5 dwarf planets and 5 planetesimal systems, is the largest planetary system found. [11] [12] [13] Most proplyds develop into a system with no planetesimal systems, or into one very large planetesimal system. [14] [15] [16] [17] [18] [19]

Proplyds in other star-forming regions

Dusty proplyds pointing to HD 17505 in Westerhout 5 as seen by the Spitzer Space Telescope Devastated Stellar Neighborhood.jpg
Dusty proplyds pointing to HD 17505 in Westerhout 5 as seen by the Spitzer Space Telescope

Photoevaporating proplyds in other star forming regions were found with the Hubble Space Telescope. NGC 1977 currently represents the star-forming region with the largest number of proplyds outside of the Orion Nebula, with 7 confirmed proplyds. It was also the first instance where a B-type star, 42 Orionis is responsible for the photoevaporation. [20] In addition, 4 clear and 4 candidate proplyds were discovered in the very young region NGC 2024, two of which have been photoevaporated by a B star. [21] The NGC 2024 proplyds are significant because they imply that external photoevaporation of protoplanetary disks could compete even with very early planet formation (within the first half a million years).

Another type of photoevaporating proplyd was discovered with the Spitzer Space Telescope. These cometary tails represent dust being pulled away from the disks. [22] Westerhout 5 is a region with many dusty proplyds, especially around HD 17505. [23] These dusty proplyds are depleted of any gas in the outer regions of the disk, but the photoevaporation could leave an inner, more robust, and possibly gas-rich disk component of radius 5-10 astronomical units. [24]

The proplyds in the Orion Nebula and other star-forming regions represent proto-planetary disks around low-mass stars being externally photoevaporated. These low-mass proplyds are usually found within 0.3 parsec (60,000 astronomical units) of the massive OB star and the dusty proplyds have tails with a length of 0.1 to 0.2 parsec (20,000 to 40,000 au). [22] There is a proposed type of intermediate massive counterpart, called proplyd-like objects. Objects in NGC 3603 and later in Cygnus OB2 were proposed as intermediate massive versions of the bright proplyds found in the Orion Nebula. The proplyd-like objects in Cygnus OB2 for example are 6 to 14 parsec distant to a large collection of OB stars and have tail lengths of 0.11 to 0.55 parsec (24,000 to 113,000 au). [25] [26] The nature of proplyd-like objects as intermediate massive proplyds is partly supported by a spectrum for one object, which showed that the mass loss rate is higher than the mass accretion rate. Another object did not show any outflow, but accretion. [27]

List of star-forming regions with proplyds

List is sorted after distance.

Star-Forming region (SFR)example imageDistance

(light-years)

Age of SFR

(Myrs)

Ionizing starsspectral type of

ionizing stars

Number of proplydstype of proplydReferences
NGC 1977 NGC 1977 proplyds zoom.png 13054 42 Orionis B1V7gaseous + dusty tails [28] [20]
Lambda Orionis Cluster Proplyd Lambda Orionis.png 13056 Meissa O8IIIf+B0.5V2dusty tails [29]
Orion Nebula Proplyd 182-413 JWST NIRCam.jpg 13441 Theta1 Orionis C O6Vp+B0V178gaseous + dark disks [1] [28]
Messier 43 Proplyd 332-1605 JWST only proplyd.jpg 13001NU Orionis (HD 37061)B0.5V3gaseous [30] [31]
Flame Nebula New bright proplyd Flame Nebula.png 13500.2 to 0.5IRS1, IRS2bB0.5V, O8V4 or 8gaseous [21]
NGC 2264 Proplyd NGC 2264.png 26094 S Mon O7Ve1dusty tails [32]
IC 1396 Proplyd IC 1396.png 27233 HD 206267 O6V1dusty tails [32]
NGC 6193 Proplyd NGC 6193.png 37835 HD 150136, CD-48 11071O3.5-4III(f*)+O6IV, B0V8 or 9dusty tails [33]
Cygnus OB2 IRAS20324 (48339932252).png 45663-5Cluster of O-stars11large "proplyd-like" objects + dusty tails [34] [35]
NGC 2244 Proplyd NGC 2244.png 48924 HD 46150 O5V1dusty tails [32]
Trifid Nebula Closeup of Proplyd in Trifid Nebula (opo0417e).jpg 54798HD 164492AO7.51gaseous [28] [36]
Pismis 24 Pismis 24 proplyd 1 F850LP.png 55441Pis 24-1, Pis 24-2O3I, O5.5 V(f)5gaseous [37]
Lagoon Nebula Lagoon Nebula proplyd.jpg 58715Herschel 36O7V1gaseous [28] [38]
Westerhout 5 Proplyd W5-HD 17505.png 75005HD 17505, HD 18326O6.5III((f))n+O8V, O7V4dusty tails [39] [23]
Carina Nebula (disputed) [40] Proplyds within the Carina Nebula (NGC 3372) (noao0301a).jpg 75013Cluster of O-stars"dozens"large "proplyd-like" objects + dark disks [41]
NGC 3603 NGC 3603 proplyd 1.jpg 195691Cluster of O-stars3large "proplyd-like" objects [28] [42]
Sgr A* 26673unknownMultiple O- and WR-stars 34gaseous [43]

See also

References

  1. 1 2 Ricci, L.; et al. (2008). "The Hubble Space Telescope/Advanced Camera for Surveys Atlas of Protoplanetary Disks in the Great Orion Nebula". Astronomical Journal. 136 (5): 2136–2151. Bibcode:2008AJ....136.2136R. doi: 10.1088/0004-6256/136/5/2136 .
  2. ↑ Sharkey, Colleen; Ricci, Luca (Dec 14, 2009). "Born in beauty: proplyds in the Orion Nebula" (Press release). Hubble/ESA, Garching, Germany. NASA/ESA. Retrieved Aug 4, 2015.
  3. ↑ Laques, P.; Vidal, J. L. (March 1979). "Detection of a new kind of condensations in the center of the Orion Nebula, by means of S 20 photocathodes associated with a Lallemand electronic camera". Astronomy & Astrophysics. 73: 97–106. Bibcode:1979A&A....73...97L. ISSN   0004-6361.
  4. ↑ Churchwell, E.; Felli, M.; Wood, D. O. S.; Massi, M. (October 1987). "Solar System--sized Condensations in the Orion Nebula". Astrophysical Journal. 321: 516. Bibcode:1987ApJ...321..516C. doi: 10.1086/165648 . ISSN   0004-637X.
  5. ↑ O'dell, C. R.; Wen, Zheng; Hu, Xihai (June 1993). "Discovery of New Objects in the Orion Nebula on HST Images: Shocks, Compact Sources, and Protoplanetary Disks". Astrophysical Journal. 410: 696. Bibcode:1993ApJ...410..696O. doi: 10.1086/172786 . ISSN   0004-637X.
  6. ↑ Aru, Mari-Liis; Mauco, Karina; Manara, Carlo F. (December 2024). "A tell-tale tracer for externally irradiated protoplanetary disks: Comparing the [C I] 8727 Å line and ALMA observations in proplyds". Astronomy & Astrophysics. 692: A137. arXiv: 2410.21018 . doi:10.1051/0004-6361/202451737.
  7. ↑ "Born in beauty: proplyds in the Orion Nebula". www.spacetelescope.org.
  8. ↑ "Proplyds". www.spacetelescope.org.
  9. ↑ Nemiroff, R.; Bonnell, J., eds. (22 December 2009). "Planetary Systems Now Forming in Orion". Astronomy Picture of the Day . NASA.
  10. ↑ Nemiroff, R.; Bonnell, J., eds. (7 December 1996). "Planetary Systems Now Forming in Orion". Astronomy Picture of the Day . NASA.
  11. ↑ "The Solar System: The Sun, Planets, Dwarf Planets, Moons, Asteroids, Comets, Meteors, Solar System Formation - Windows to the Universe".
  12. ↑ Williams, Matt (September 5, 2015). "Solar System Guide".
  13. ↑ Williams, Matt (December 3, 2014). "The Inner Planets of Our Solar System".
  14. ↑ "Planet-Metallicity Correlation". sites.astro.caltech.edu.
  15. ↑ Fischer, Debra A.; Valenti, Jeff (April 1, 2005). "The Planet-Metallicity Correlation". The Astrophysical Journal. 622 (2): 1102–1117. Bibcode:2005ApJ...622.1102F. doi: 10.1086/428383 . S2CID   121872365.
  16. ↑ Wang, Ji; Fischer, Debra A. (January 1, 2015). "Revealing A Universal Planet-Metallicity Correlation For Planets of Different Sizes Around Solar-Type Stars". The Astronomical Journal. 149 (1): 14. arXiv: 1310.7830 . Bibcode:2015AJ....149...14W. doi:10.1088/0004-6256/149/1/14. S2CID   118415186.
  17. ↑ Sanders, Ray (9 April 2012). "When Stellar Metallicity Sparks Planet Formation". Astrobiology Magazine. Archived from the original on 2020-12-07.
  18. ↑ From Lithium to Uranium (IAU S228): Elemental Tracers of Early Cosmic Evolution By International Astronomical Union. Symposium, by Vanessa Hill, Patrick Francois, Francesca Primas, page 509-511, "the G star problem"
  19. ↑ Kokubo, E.; Ida, S. (30 October 2012). "Dynamics and accretion of planetesimals". Progress of Theoretical and Experimental Physics. 2012 (1): 1A308–0. arXiv: 1212.1558 . doi: 10.1093/ptep/pts032 .
  20. 1 2 Kim, Jinyoung Serena; Clarke, Cathie J.; Fang, Min; Facchini, Stefano (July 2016). "Proplyds Around a B1 Star: 42 Orionis in NGC 1977". The Astrophysical Journal. 826 (1): L15. arXiv: 1606.08271 . Bibcode:2016ApJ...826L..15K. doi: 10.3847/2041-8205/826/1/L15 . hdl: 10150/621402 . ISSN   2041-8205. S2CID   118562469.
  21. 1 2 Haworth, Thomas; Jinyoung, Kim; Winter, Andrew; Hines, Dean; Clarke, Cathie; Sellek, Andrew; Ballabio, Giulia; Stapelfeldt, Karl (March 2021). "Proplyds in the flame nebula NGC 2024". Monthly Notices of the Royal Astronomical Society. 501 (3): 3502–3514. arXiv: 2012.09166 . doi: 10.1093/mnras/staa3918 .
  22. 1 2 Balog, Zoltan; Rieke, G. H.; Su, Kate Y. L.; Muzerolle, James; Young, Erick T. (2006-09-25). "Spitzer MIPS 24 μm Detection of Photoevaporating Protoplanetary Disks". The Astrophysical Journal Letters. 650 (1): L83. arXiv: astro-ph/0608630 . Bibcode:2006ApJ...650L..83B. doi: 10.1086/508707 . ISSN   1538-4357.
  23. 1 2 Koenig, X. P.; Allen, L. E.; Kenyon, S. J.; Su, K. Y. L.; Balog, Z. (2008-10-03). "Dusty Cometary Globules in W5". The Astrophysical Journal Letters. 687 (1): L37. arXiv: 0809.1993 . Bibcode:2008ApJ...687L..37K. doi: 10.1086/593058 . ISSN   1538-4357.
  24. ↑ Balog, Zoltan; Rieke, George H.; Muzerolle, James; Bally, John; Su, Kate Y. L.; Misselt, Karl; Gáspár, András (November 2008). "Photoevaporation of Protoplanetary Disks". The Astrophysical Journal. 688 (1): 408. arXiv: 0807.3724 . Bibcode:2008ApJ...688..408B. doi: 10.1086/592063 . ISSN   0004-637X.
  25. ↑ Wright, Nicholas J.; Drake, Jeremy J.; Drew, Janet E.; Guarcello, Mario G.; Gutermuth, Robert A.; Hora, Joseph L.; Kraemer, Kathleen E. (February 2012). "Photoevaporating Proplyd-Like Objects in Cygnus Ob2". The Astrophysical Journal. 746 (2): L21. arXiv: 1201.2404 . Bibcode:2012ApJ...746L..21W. doi:10.1088/2041-8205/746/2/L21. ISSN   2041-8205. S2CID   16509383.
  26. ↑ Brandner, Wolfgang; Grebel, Eva K.; Chu, You-Hua; Dottori, Horacio; Brandl, Bernhard; Richling, Sabine; Yorke, Harold W.; Points, Sean D.; Zinnecker, Hans (January 2000). "HST/WFPC2 and VLT/ISAAC Observations of Proplyds in the Giant H II Region NGC 3603*". The Astronomical Journal. 119 (1): 292. arXiv: astro-ph/9910074 . Bibcode:2000AJ....119..292B. doi:10.1086/301192. ISSN   1538-3881. S2CID   15502401.
  27. ↑ Guarcello, M. G.; Drake, J. J.; Wright, N. J.; García-Alvarez, D.; Kraemer, K. E. (September 2014). "Accretion and Outflow in the Proplyd-Like Objects Near Cygnus Ob2". The Astrophysical Journal. 793 (1): 56. arXiv: 1409.1017 . Bibcode:2014ApJ...793...56G. doi: 10.1088/0004-637X/793/1/56 . ISSN   0004-637X.
  28. 1 2 3 4 5 Kharchenko, N. V.; Piskunov, A. E.; Schilbach, E.; Röser, S.; Scholz, R. -D. (2016-01-01). "Global survey of star clusters in the Milky Way. V. Integrated JHKS magnitudes and luminosity functions". Astronomy and Astrophysics. 585: A101. Bibcode:2016A&A...585A.101K. doi: 10.1051/0004-6361/201527292 . ISSN   0004-6361.
  29. ↑ Thévenot, Melina; Doll, Katharina; Durantini Luca, Hugo A. (2019-07-01). "Photoevaporation of Two Proplyds in the Star Cluster Collinder 69 Discovered with Spitzer MIPS". Research Notes of the American Astronomical Society. 3 (7): 95. Bibcode:2019RNAAS...3...95T. doi: 10.3847/2515-5172/ab30c5 . ISSN   2515-5172.
  30. ↑ O'Dell, C. R. (2001-11-01). "New Proplyds, Outflows, Shocks, and a Reflection Nebula in M43 and the Outer Parts of the Orion Nebula". The Astronomical Journal. 122: 2662–2667. Bibcode:2001AJ....122.2662O. doi:10.1086/323720. ISSN   0004-6256.
  31. ↑ Habart, Emilie; Peeters, Els; Berné, Olivier; Trahin, Boris; Canin, Amélie; Chown, Ryan; Sidhu, Ameek; Van De Putte, Dries; Alarcón, Felipe; Schroetter, Ilane; Dartois, Emmanuel; Vicente, Sílvia; Abergel, Alain; Bergin, Edwin A.; Bernard-Salas, Jeronimo (2024-05-01). "PDRs4All. II. JWST's NIR and MIR imaging view of the Orion Nebula". Astronomy and Astrophysics. 685: A73. arXiv: 2308.16732 . Bibcode:2024A&A...685A..73H. doi:10.1051/0004-6361/202346747. ISSN   0004-6361.
  32. 1 2 3 Balog, Zoltan; Rieke, G. H.; Su, Kate Y. L.; Muzerolle, James; Young, Erick T. (2006-10-01). "Spitzer MIPS 24 μm Detection of Photoevaporating Protoplanetary Disks". The Astrophysical Journal. 650 (1): L83 –L86. arXiv: astro-ph/0608630 . Bibcode:2006ApJ...650L..83B. doi: 10.1086/508707 . ISSN   0004-637X.
  33. ↑ Thévenot, Melina (2020-01-01). "Cometary Tails as a Sign of Disk Photoevaporation in NGC 6193". Research Notes of the American Astronomical Society. 4 (1): 15. Bibcode:2020RNAAS...4...15T. doi: 10.3847/2515-5172/ab701d . ISSN   2515-5172.
  34. ↑ Guarcello, M. G.; Drake, J. J.; Wright, N. J.; Drew, J. E.; Gutermuth, R. A.; Hora, J. L.; Naylor, T.; Aldcroft, T.; Fruscione, A.; García-Alvarez, D.; Kashyap, V. L.; King, R. (2013-08-01). "The Protoplanetary Disks in the Nearby Massive Star-forming Region Cygnus OB2". The Astrophysical Journal. 773 (2): 135. arXiv: 1306.5757 . Bibcode:2013ApJ...773..135G. doi:10.1088/0004-637X/773/2/135. hdl: 10871/22086 . ISSN   0004-637X.
  35. ↑ Wright, Nicholas J.; Drake, Jeremy J.; Drew, Janet E.; Guarcello, Mario G.; Gutermuth, Robert A.; Hora, Joseph L.; Kraemer, Kathleen E. (2012-02-01). "Photoevaporating Proplyd-like Objects in Cygnus OB2". The Astrophysical Journal. 746 (2): L21. arXiv: 1201.2404 . Bibcode:2012ApJ...746L..21W. doi:10.1088/2041-8205/746/2/L21. ISSN   0004-637X.
  36. ↑ Yusef-Zadeh, F.; Biretta, J.; Geballe, T. R. (2005-09-01). "Hubble Space Telescope and United Kingdom Infrared Telescope Observations of the Center of the Trifid Nebula: Evidence for the Photoevaporation of a Proplyd and a Protostellar Condensation". The Astronomical Journal. 130 (3): 1171–1176. arXiv: astro-ph/0505155 . Bibcode:2005AJ....130.1171Y. doi:10.1086/432095. ISSN   0004-6256.
  37. ↑ Fang, M.; van Boekel, R.; King, R. R.; Henning, Th.; Bouwman, J.; Doi, Y.; Okamoto, Y. K.; Roccatagliata, V.; Sicilia-Aguilar, A. (2012-03-01). "Star formation and disk properties in Pismis 24". Astronomy and Astrophysics. 539: A119. arXiv: 1201.0833 . Bibcode:2012A&A...539A.119F. doi:10.1051/0004-6361/201015914. hdl: 10486/662673 . ISSN   0004-6361.
  38. ↑ Stecklum, B.; Henning, T.; Feldt, M.; Hayward, T. L.; Hoare, M. G.; Hofner, P.; Richter, S. (1998-02-01). "The Ultracompact H II Region G5.97-1.17: an Evaporating Circumstellar Disk in M8". The Astronomical Journal. 115 (2): 767–776. Bibcode:1998AJ....115..767S. doi: 10.1086/300204 . ISSN   0004-6256.
  39. ↑ Sota, A.; Maíz Apellániz, J.; Walborn, N. R.; Alfaro, E. J.; Barbá, R. H.; Morrell, N. I.; Gamen, R. C.; Arias, J. I. (2011-04-01). "The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500". The Astrophysical Journal Supplement Series. 193 (2): 24. arXiv: 1101.4002 . Bibcode:2011ApJS..193...24S. doi: 10.1088/0067-0049/193/2/24 . ISSN   0067-0049.
  40. ↑ Sahai, R.; Güsten, R.; Morris, M. R. (2012-12-01). "Are Large, Cometary-shaped Proplyds Really (Free-floating) Evaporating Gas Globules?". The Astrophysical Journal. 761 (2): L21. arXiv: 1211.0345 . Bibcode:2012ApJ...761L..21S. doi:10.1088/2041-8205/761/2/L21. ISSN   0004-637X.
  41. ↑ Smith, Nathan; Bally, John; Morse, Jon A. (2003-04-01). "Numerous Proplyd Candidates in the Harsh Environment of the Carina Nebula". The Astrophysical Journal. 587 (2): L105 –L108. Bibcode:2003ApJ...587L.105S. doi:10.1086/375312. ISSN   0004-637X.
  42. ↑ Brandner, Wolfgang; Grebel, Eva K.; Chu, You-Hua; Dottori, Horacio; Brandl, Bernhard; Richling, Sabine; Yorke, Harold W.; Points, Sean D.; Zinnecker, Hans (2000-01-01). "HST/WFPC2 and VLT/ISAAC Observations of Proplyds in the Giant H II Region NGC 3603". The Astronomical Journal. 119 (1): 292–301. arXiv: astro-ph/9910074 . Bibcode:2000AJ....119..292B. doi: 10.1086/301192 . ISSN   0004-6256.
  43. ↑ Yusef-Zadeh, F.; Roberts, D. A.; Wardle, M.; Cotton, W.; Schödel, R.; Royster, M. J. (2015-03-01). "Radio Continuum Observations of the Galactic Center: Photoevaporative Proplyd-like Objects Near Sgr A*". The Astrophysical Journal. 801 (2): L26. arXiv: 1502.03109 . Bibcode:2015ApJ...801L..26Y. doi:10.1088/2041-8205/801/2/L26. ISSN   0004-637X.
  44. ↑ Kirwan, A.; Manara, C. F.; Whelan, E. T.; Robberto, M.; McLeod, A. F.; Facchini, S.; Beccari, G.; Miotello, A.; Schneider, P. C.; Murphy, A.; Vicente, S. (2023-03-01). "A spectacular jet from the bright 244-440 Orion proplyd: the MUSE NFM view". Astronomy and Astrophysics. 673: A166. arXiv: 2303.13205 . Bibcode:2023A&A...673A.166K. doi:10.1051/0004-6361/202245428.
  45. ↑ Luhman, K. L.; Alves de Oliveira, C; Baraffe, I.; Chabrier, G.; Manjavacas, E.; Parker, R. J.; Tremblin, P. (13 Oct 2024). "JWST/NIRSpec Observations of Brown Dwarfs in the Orion Nebula Cluster". arXiv: 2410.10000 [astro-ph].
  46. ↑ Aru, Mari-Liis; Mauco, Karina; Manara, Carlo F. (July 2024). "Kaleidoscope of irradiated disks: MUSE observations of proplyds in the Orion Nebula Cluster - I. Sample presentation and ionization front sizes". Astronomy & Astrophysics. 687: A93. doi:10.1051/0004-6361/202349004.
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