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List of extrasolar planetary collisions

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Revision as of 19:18, 2 January 2025 by Meli thev (talk | contribs) (created article "List of extrasolar planetary collisions")(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff) This is a list of planet collisions outside the solar system. Asteroid CollisionArtist's impression of a collision in NGC 2354–ID8Fomalhaut bFading and expansion of the Fomalhaut b dust cloud

This is a list of collisions between exoplanets or planetesimals observed in extrasolar systems. These collisions are more common in young systems and are an important part in the growth of especially terrestrial planets from so-called planetary embryos. Detections of individual collisions are nevertheless rare and are detected via transits in the optical, infrared excess, silicate emission or via infrared brightening. Collisions are thought to be common in a type of debris disk, so-called extreme debris disks (EDD). Co-moving stellar or substellar companions can trigger such collisions at an old age, creating old EDDs. Only about 24 EDDs are known.

This list does not include planetary bodies being accreted by white dwarfs, for this refer to the List of exoplanets and planetary debris around white dwarfs.

List of individual events

This list contains systems with individual collision events that were directly observed. Alternatively events were inferred from properties of the disk. The list is sorted after the start of the event.

Name of star spectral type approximate age (Myr) extreme debris disk? start of event colliding bodies notes Reference
Beta Pictoris A6V 20 no a few years before 2004 decreased mid-infrared flux and disappearance of forsterite emission
~150 years ago 100-500 km body so-called "cat's tail" feature in the disk observed in mid-infrared
Fomalhaut A3V 440 no early 2004 two bodies of ≥110 km in size, or a 56 km body impacting a 893 km body Fomalhaut b was once suspected to be a planet, but is now suspected to be the remains of a planetary collision
P1121 F9V 80 yes prior to 2012 two bodies with sizes of ≥100 km one hypervelocity impact
NGC 2354–ID8 G6V 35 yes start of 2013? two bodies with sizes of ≥100 km two violent impacts, likely grazing or hit-and-run type events
HD 169142 A5V 6 no 2013–2018 unknown Variability interpreted as appearance and disappearance of a dust ring. Comparisons with EDDs were made.
TYC 4209-1322-1 G1V 275 yes sometime in 2014 two ≥90 km bodies additional earlier event in ≤2010
HD 166191 late F- to early G 10 yes early 2018 two ≥500 km bodies Sudden increase of dust production in early 2018, reaching a high in 2019. Also transit of star-sized dust clouds, produced by the collisions.
ASASSN-21qj G2 300 no? December 2021 two ice giants breakup of exocomets was also proposed
HD 172555 A5V 23 no within 0.1 Myr two planetesimals compared to the formation of the Moon
BD+20 307 F-type binary ≥1000 yes unknown planetary-scale catastrophic collision between planetary-scale bodies
HD 15407A F3V 80 or 2100 yes unknown planetesimals? one giant hypervelocity impact?
HD 23514 F6V 100 yes unknown planetary embryos member of the Pleiades
TYC 4479-3-1 G6V 5000 yes unknown ≥50 km planetesimal disruption of one body
HD 113766A F2V 17 yes unkown partially differentiated bodies recent impact of two asteroids or planetary bodies
TYC 8830-410-1 G9V 600 yes unknown rocky bodies giant impact

List of other EDD

These objects appear as EDDs in Moór et al. EDDs are listed here, because they are often associated with individual giant collisions. List is sorted after discovery year.

Name of star spectral type approximate age (Myr) notes discovery year Reference
V488 Persei K2-2.5 V 80 Due to the high age the transits cannot be explained with a transiting disk. Constant collisions will last 1,000 to 10,000 years. Possibly formation of a Mercury-like planet. 2012
TYC 8241-2652-1 K2 10 rapid disappearance of the disk, unknown mechanism 2012
RZ Piscium K0IV 30 Intense continuous collisions, destroying a 90 km asteroid each year. 2013
TIC 43488669 100-400 runaway star, without further estimates of the collisions 2020
TYC 4515-485-1 F5V >150 without further estimates of the collisions 2021
TYC 5940-1510-1 G5V 120 without further estimates of the collisions 2021
TYC 8105-370-1 G9V 130 without further estimates of the collisions 2021
TYC 4946-1106-1 F6V >150 without further estimates of the collisions 2021
J060917 G9V 200 without further estimates of the collisions 2024
J071206 K3.5V 240 without further estimates of the collisions 2024
CD-44 6765 K0.5V 5500 without further estimates of the collisions 2024
J204315 K4V 250 without further estimates of the collisions 2024

List of EED without collisions

Name of star spectral type approximate age (Myr) notes discovery year Reference
HD 145263 F4V 11 hypervelocity impact was excluded in one study, instead extreme space weathering was suggested to explain observed mineralogy. This object appears as an EDD in Moór et al. 1998

See also

References

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  31. Tajiri, Tomoyuki; Kawahara, Hajime; Aizawa, Masataka; Fujii, Michiko S.; Hattori, Kohei; Kasagi, Yui; Kotani, Takayuki; Masuda, Kento; Momose, Munetake; Muto, Takayuki; Ohsawa, Ryou; Takita, Satoshi (2020-12-01). "Dippers from the TESS Full-frame Images. I. Results of the First One Year Data and Discovery of a Runaway Dipper". The Astrophysical Journal Supplement Series. 251: 18. arXiv:2009.12830. Bibcode:2020ApJS..251...18T. doi:10.3847/1538-4365/abbc17. ISSN 0067-0049.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  32. ^ Lisse, C. M.; Meng, H. Y. A.; Sitko, M. L.; Morlok, A.; Johnson, B. C.; Jackson, A. P.; Vervack, R. J., Jr.; Chen, C. H.; Wolk, S. J.; Lucas, M. D.; Marengo, M.; Britt, D. T. (2020-05-01). "HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?". The Astrophysical Journal. 894: 116. arXiv:2003.06870. Bibcode:2020ApJ...894..116L. doi:10.3847/1538-4357/ab7b80. ISSN 0004-637X.{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: unflagged free DOI (link)
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