Wha can he mochemical models ell
us abou he cold H2O in disks?
Ma issa Vlasblom lasblom@s w.leidenuni .nl||ESO New F on ie s - 12/03/25 ||
Image: M. Vlasblom
Wa e in disks
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||
❖H2O is o med in he inne
egions h ough gas-phase
o ma ion
❖Beyond he snowline, i is
ozen ou on he dus g ains
❖Radial d i & sublima ion can
enhance inne disk H2O
ese oi !
Ma issa Vlasblom lasblom@s w.leidenuni .nl||ESO New F on ie s - 12/03/25 ||
Re : Mio ello e al. (2023)
Wa e in disks
❖Many o- ib a ional & o a ional H2O lines seen wi h JWST-MIRI!
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||ESO New F on ie s - 12/03/25 ||
Re : Temmink e al. (2024a,b)
Fo mo e H2O as seen wi h MIRI:
see Milou Temmink’s pos e !
Wa e in disks
❖Dus And LInes (DALI)
➢1) Dus adia i e ans e
➢2) Chemis y + he mal balance +
exci a ion
➢3) Ray acing
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||ESO New F on ie s - 12/03/25 ||
H2O p obed
by JWST
H2O p obed
by FIR/mm
❖JWST p obes wide ange o
Eup ~1000 - 8000 K
❖Coldes H2O Eup <1000 K is
p obed by FIR/mm
DALI: B ude e e al. (2012, 2013)
Wa e in disks
❖Ro a ional H2O spec um co e s a wide ange o exci a ion condi ions
❖Can he lines acing colde ma e ial ell us wha is happening a he
snowline?
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||ESO New F on ie s - 12/03/25 ||
Re : Banza i e al. (2023)
Cold H2O emission
❖Lines a ound 23.8 mic on a e a good diagnos ic o p esence o cold H2O
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||
Wa m emission
only
Needs a cold
componen !
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl
1500 K
3000 K
||ESO New F on ie s - 12/03/25 ||
Re : Banza i e al. (2020, 2023, 2025); Rome o-Mi za e al. (2024)
Cold H2O emission
❖Lines a ound 23.8 mic on a e a good diagnos ic o p esence o cold H2O
❖S ong cold H2O is mainly seen in compac disks
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||
? ?
dus
gas
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl
S ong d i ?Dus apping?
❖Obse a ions show di e si y in hese lines →wha d i es his?
1500 K
3000 K
||ESO New F on ie s - 12/03/25 ||
Re : Banza i e al. (2020, 2023, 2025); Rome o-Mi za e al. (2024), Temmink e al. (subm.) →see Milou Temmink’s pos e !
The mochemical modeling
❖Can skip chemis y and
pa ame e ize abundances ins ead
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||ESO New F on ie s - 12/03/25 ||
Re : Vlasblom e al. (in p ep.)
The mochemical modeling
❖Can skip chemis y and
pa ame e ize abundances ins ead
❖Gene a e syn he ic spec a wi h
DALI models
Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||As ochemis y semina 25/11/24 ||Ma issa Vlasblom lasblom@s w.leidenuni .nl||ESO New F on ie s - 12/03/25 ||
Chemis y → wa m Pa am. abu. → cold
❖When de e mining he H2O
abundance ia he chemical
ne wo k, he cold lines a e no
e y p ominen !
Re : Vlasblom e al. (in p ep.)
