NITROGEN ISOTOPES
IN PROTOPLANETARY DISKS
N2
HCN
C15N
ESO
N15N
CN
HC15N
Ruud Visser ESO Fellow !
in collabora?on with
Simon Bruderer and Alan Heays !
January 19, 2016
14
15
NITROGEN: N AND N
0.012
0.01
0.007
0.005
440
Jupiter, solar wind
0.002
adapted from Mumma & Charnley (2011) and Wampfler et al. (2014)
14
15
NITROGEN: N AND N
81P/
Wild 2
Hale17P/
Bopp Holmes
0.012
0.01
15
N
hotspots
0.007
0.005
440
Jupiter, solar wind
0.002
adapted from Mumma & Charnley (2011) and Wampfler et al. (2014)
14
15
NITROGEN: N AND N
81P/
Wild 2
Hale17P/ Protoplanetary Protostars Pre-stellar
Bopp Holmes
disks
cores
0.012
0.01
15
N
hotspots
440
?
Jupiter, solar wind
0.007
0.005
0.002
adapted from Mumma & Charnley (2011) and Wampfler et al. (2014)
ISOTOPE FRACTIONATION
14N/15N ra?o
14N
14N
self-­‐shielding
14N
15N
440
ISOTOPE FRACTIONATION
14N/15N ra?o
14N
14N
14N
15N
440
self-­‐shielding
14N
14N
14N
15N
50–250
ISOTOPE FRACTIONATION
14N/15N ra?o
14N
14N
14N
15N
440
self-­‐shielding
14N
14N
14N
15N
50–250
C
H
H
C
H
14N
H
C
15N
50–250
MODELS OF DISK CHEMISTRY
R
M⇤ = 0.8 M
Mdisk = 10
4
M
Rdisk = 400 AU
Column density ratio HCN / HC15 N
Column
density
500
450
400
350
300
250
200
10-1
100
!
101
R (AU)
102
Integrated over the disk: HC14N / HC15N = 360 (local minimum: 80)
Visser et al. (in prep.)
CONCLUSION
81P/
Wild 2
Hale17P/ Protoplanetary Protostars Pre-stellar
Bopp Holmes
disks
cores
0.012
0.01
15
N
hotspots
440
?
Jupiter, solar wind
Visser, Bruderer & Heays (in prep.) www.ruudvisser.com/talks
[email protected]
0.007
0.005
0.002
CONCLUSION
81P/
Wild 2
Hale17P/ Protoplanetary Protostars Pre-stellar
Bopp Holmes
disks
cores
0.012
0.01
15
N
hotspots
0.007
0.005
440
Jupiter, solar wind
Visser, Bruderer & Heays (in prep.) www.ruudvisser.com/talks
[email protected]
0.002