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List of extrasolar planetary collisions
This is a list of planet collisions outside the solar system.

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 starspectral typeApprox. age(Myr)Extremedebrisdisk?Start of eventColliding bodiesNotesRef.
Beta PictorisA6V20no~150 years ago100–500 km bodySo-called "cat's tail" feature in the disk observed in mid-infrared4
A few years before 2004Decreased mid-infrared flux and disappearance of forsterite emission5
FomalhautA3V440noEarly 2004Two bodies of ≥110 km in size, or a 56 km body impacting a 893 km bodyFomalhaut b was once suspected to be a planet, but is now suspected to be the remains of a planetary collision6
P1121F9V80yes7Before 2012Two bodies with sizes of ≥100 kmOne hypervelocity impact89
NGC 2547–ID8G6V35yes10late 2012Two bodies with sizes of ≥100 kmlikely grazing or hit-and-run type event1112
early 2014100 km bodies, maybe same objects as the first eventfragments dominated by boulders13
HD 169142A5V6no2013–2018UnknownVariability interpreted as appearance and disappearance of a dust ring. Comparisons with EDDs were made.14
TYC 4209-1322-1G1V275yes152010 or earlierunknown16
Sometime in 2014Two ≥90 km bodiesbrightening and fading between 2014 and 20181718
HD 166191late F- to early G10yes19Early 2018Two ≥500 km bodiesSudden increase of dust production in early 2018, reaching a high in 2019. Also transit of star-sized dust clouds, produced by the collisions.20
V488 PerseiK2-2.5 V80yes212019Two 60 km bodiesConstant collisions will last 1,000 to 10,000 years.Possibly formation of a Mercury-like planet.2223
ASASSN-21qjG2300no?December 2021Two ice giantsBreakup of exocomets was also proposed.2425
HD 172555A5V23noWithin 0.1 MyrTwo planetesimalsCompared to the formation of the Moon2627
BD+20 307F-type binary≥1000yes28UnknownPlanetary-scaleCatastrophic collision between planetary-scale bodies2930
HD 15407AF3V80 or 2100yes31UnknownPlanetesimals?One giant hypervelocity impact?3233
HD 23514F6V100yes34UnknownPlanetary embryosMember of the Pleiades35
TYC 4479-3-1G6V5000yes36Unknown≥50 km planetesimalDisruption of one body37
HD 113766AF2V17yes38UnknownPartially differentiated bodiesRecent impact of two asteroids or planetary bodies3940
TYC 8830-410-1G9V600yes41UnknownRocky bodiesGiant impact42

List of other EDDs

These objects appear as EDDs in Moór et al.43 EDDs are listed here, because they are often associated with individual giant collisions. List is sorted after discovery year.

Name of starSpectral typeApprox. age(Myr)NotesDiscovery year44Ref.
TYC 8241–2652–1K210rapid disappearance of the disk, unknown mechanism20124546
RZ PisciumK0IV30Intense continuous collisions, destroying a 90 km asteroid each year.20134748
TIC 43488669100-400runaway star, without further estimates of the collisions202049
TYC 4515–485–1F5V>150without further estimates of the collisions202150
TYC 5940–1510–1G5V120without further estimates of the collisions202151
TYC 8105–370–1G9V130without further estimates of the collisions202152
BD-04 3234 (TYC 4946–1106–1)F6V>150without further estimates of the collisions202153
TYC 9196-2916-1K4.5V85without further estimates of the collisions20225455
2MASS J06091701-1508085G9V200without further estimates of the collisions202456
2MASS J07120655-4752423K3.5V240without further estimates of the collisions202457
CD-44 6765K0.5V5500without further estimates of the collisions202458
2MASS J20431522+1043355K4V250without further estimates of the collisions202459

List of EDD without collisions

Name of starspectral typeapproximate age (Myr)notesdiscovery year60Reference
HD 145263F4V11hypervelocity impact was excluded in one study, instead extreme space weathering was suggested to explain observed mineralogy.61 This object appears as an EDD in Moór et al.62199863

See also

References

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