Collabo a o s
:
Bianchi E. (INAF-OAA), Chandle C. J. (NRAO), Cacciapuo i L. (ESO), Podio
L. (INAF-OAA), Mau ei a M. J. (MPE-CAS), Codella C. (INAF-OAA), Cecca elli C. (UGA), Tes i L.
(UniBo), Sakai N. (RIKEN), Yamamo o S. (SOKENDAI) & he
FAUST Team
Osse a o io As o isico
di A ce i (INAF-OAA)
The ALMA-FAUST e olu ion:
Hun ing la ge-g ains ac o ies in p o os ella
ou low ca i ies
Gio anni Saba ini
(INAF-OAA)
Towa ds new on ie s:
he as ochemical jou ney om
young s ella nu se ies o exoplane s
ESO Ga ching, 10-14 Ma ch 2025
Molecula
cloud P o os ella
sys em
P o oplane a y
disk
Plane a y
sys em
Con ex : S a & Plane o ma ion
Inhe i ance scena io
Reshaping/Rese scena io
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [01]
Dus g ow h
Image c edi : Bill Sax on (NSF/AUI/NRAO)
Tu bulen & sub-Keple ian disks
Se e al in e ac ing p ocesses play a ole in he
coagula ion/g ow h o dus g ains
(e.g. Tes i e al. 2014,
D azkowska e al. 2023,
Mio ello e al. 2023,
Bi ns iel 2024)
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [02]
Road o plane s
(Galame z e al. 2019)
(Windma k e al. 2012)
Bouncing
Mass ans e
E osion
F agmen a ion
S icking
S icking-bouncing
Bo h p ocesses
concu in he
me e-size ba ie
Radial-d i Ou comes o pa icles collision
(e.g. O mel e al. 2009; Ba e 2022, Leb euilly e al. 2023)
How can we explain all hese esul s?
(Weidenschilling 1977)
❏dus g ow h (~mm-size) could begin in
collapsing inne p o os ella en elope
❏… bu models show limi ed dus g ow h
(up o ~µm) in di use molecula clouds.
(e.g. Kwon e al. 2009; Mio ello e al. 2014; Galame z e al. 2019)
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [03]
Key p oblem: g ow h ba ie
βISM ~ 1.6
(>25 pape s accep ed)
Se up & T ace s
FAUST: Fi y AU S udy o he chemis y in he
disk/en elope sys em o Sola -like p o os a s
Yamamo o S., Cecca elli C., Chandle C., Codella C., Sakai, N.
Band 6
Band 3
L1551 IRS5
(Podio e al 2024)
Acc e ion s eame
(Bianchi e al 2020)
Ho -co ino chemis y
(Codella e al 2024)
Disc winds
(De Simone e al 2024)
Chemical- ich disc
(Codella e al 2021)
IRS 63
L1551
VLA 1623-2417
NGC 1333 IRAS 4A2
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [04]
FAUST ALMA La ge P og am
H2CO
Saba ini e al. (2024)
Saba ini e al. (2024)
Dus - ich ca i y walls associa ed wi h he ou low d i en by IRS7B
al e na i e scena io o explain la ge g ains in p o os ella en elopes
(e.g. Cacciapuo i e al 2024 and Giacalone e al. 2019, Tsukamo o e al. 2021, Bhanda e e al. 2024)
Bipola adio-je s @ 3.5, 6 and 20 cm + CH3OH and SiO:
signa u e o he je impac .
(Mie inen e al. 2008, Ha iu e al. 2001, Choi & Ta ema su 2004)
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [05]
Dus y ca i ies in C A @mm
IRS7B (Co ona Aus alis)
New la ge-g ains ac o ies (?)
IRS7B (Co ona Aus alis)
CH3OH
(42,3-31,2) E
Slope o he dus sub-mmSED
Dus opaci y index
(Rayleigh-Jeans app oxima ion +
op ically hin emission)
(Saba ini e al 2024)
●We ound αmm> 1.4:
g ain g ow h in he en elope ?!
@ Tdus = 30 K 〈Mwalls〉~ 9 ✕ 10-3 M☉
(e.g. D aine 2006, Tes i e al 2014, Guidi e al 2016, Ricci e al.
2018, Ca asco-González e al. 2019, Ysa d e al. 2019)
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [06]
Tes i e al (2014)
L1551-IRS5 (Tau us)
Saba ini e al. (2024)
F om C A and beyond!!!
(Saba ini e al
in p ep
)
❏P o o ypical Class-I
❏dis ance o 141 ± 7 pc
❏Lbol ~ 30 L⊙
❏FU O i-like objec
❏Mass-loss ~ 1-5 ☓ 10-5 M⊙ y -1
(e.g. Adams, Lada & Shu 1987, Connelley & Reipu h 2018, Zucke e al. 2019)
1”
Bianchi e al. 2020
FAUST I
(Saba ini e al
in p ep
)
3σ
6σ
10σ
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [07]
Physical p op. o he ca i y wall
(Saba ini e al
in p ep
)
(Bianchi e al. 2020)
0.4”
(e.g. Cecca elli e al. 2000, Mo e & And é 2001,
Jo gensen e al 2002)
❏Rayleigh-Jeans
app oxima ion
❏Op ically hin emission
@ Tdus = 30 K
〈Mdus 〉~ 58 M⊕
〈n(H2)〉> 2 ✕ 105 cm-3
G. Saba ini - New F on ie s 2025 - 11 Ma . 2025 [08]
(Saba ini e al
in p ep
)
