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SUMMARY:Exomoons of Circumbinary Planets
DTSTART:20260420T124500Z
DTEND:20260420T130000Z
DTSTAMP:20260418T160200Z
UID:indico-event-1800@indico.dfa.unipd.it
DESCRIPTION:Speakers: Virginia Bettio (Università degli Studi di Padova)\
 n\n\nConfirmation of the first exomoon remains elusive. Although several e
 xomoon candidates exist around single stars\, there are currently no candi
 dates around circumbinary planets (CBPs). Most CBPs are thought to form fa
 r from the host binary and migrate through the protoplanetary disk. Theref
 ore\, an exomoon of a CBP represents a fascinating yet complex and evolvin
 g four-body system. Their existence (or absence) would shed light on the r
 obustness of moon formation and evolution in dynamically active planetary 
 systems. In this work\, we simulate the orbital evolutions of exomoons aro
 und migrating CBPs. We show that for fully migrated CBPs\, a moon is capab
 le of surviving the migration if it is formed within ∼5%─10% of the pl
 anet's Hill radius\, well within the currently proposed range at which moo
 ns are thought to settle in the planetary disk for giant planets. Of the m
 oons that remained gravitationally bound to their host planet postmigratio
 n\, 18% lie within the habitable zone\, supporting the potential for circu
 mbinary habitability\, even if all currently known CBPs are gas giants. Me
 anwhile\, 38% of moons escape their host planet early in the migration and
  become long-period CBPs (i.e a multiplanet circumbinary system). Nearly o
 ne-third of exomoons collide with their host planet\, and 1% are ejected f
 rom the system entirely. This last class presents another pathway for prod
 ucing free-floating planetary-mass objects\, like those discovered recentl
 y and expected from the Roman microlensing survey.\n\n\n\nhttps://indico.d
 fa.unipd.it/event/1800/
LOCATION:Aula Rosino (Dipartimento di Fisica e Astronomia - Edificio ex-Ri
 zzato)
URL:https://indico.dfa.unipd.it/event/1800/
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