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OBSID:
26474
 Title:
X-ray driven chemistry in the protoplanetary disk of DQ Tau    
Investigator:
Getman
 Observer:
Getman, Konstantin
 Phone:
814-4415876
 Email:
kug1@psu.edu
Target Name:
DQ Tau
 Sequence Number:
201553
 Instrument:
ACIS-I
 Grating:
NONE
 SI Mode:
TE_00C10B
 Raster Scan:
N
 Annotated DOT:
AUG0822a

Proposal Number:
23208853
 Right Ascension:
71.7211
 Declination:
17
 Status:
archived
 Start Date:
2022-08-11 05:22:41
Category:
STARS AND WD
 Type:
DDT
 AO Cycle:
23
 Dither Flag:
Y
 Y Offset:
0
 Z Offset:
0
Est. Count Rate:
0.1
 Order-1 Count Rate:

 Exposure Time:
1.5
 Time Remaining:
1.616
 Reqd Start Time:

 Reqd Stop Time:
Period:

 Epoch:

 Start of Period:

 End of Period:

 PS Margin:

 PE Margin:

 Max Segments:
0

ACIS Mode:
TE
 Standard?:
No
 BEP Mode:
VF
On-Chip Summing?:
No
 Row Sum:

 Column Sum:

 Frame Time:
Subarray Mode:
CUSTOM
 Starting Row:
897
 Row Count:
128
 Subarray Frame Time:

Duty Cycle?:
No
 Cycle Count:
0
 Primary Exp Time:

 Secondary Exp Time:
Event Filter?:
No
 Filter Threshold:

 Filter Range:

 Bias Requested?:
No
 Bias Frequency:

 Bias After?:
No
 Spatial Window?:
No

Abstract:
X-ray flares are expected to induce time-variable ion-molecular chemistry in young protoplanetary disks. DQ Tau is a young, high eccentricity binary that exhibits flux increases in X-ray/optical/mm-band near periastron and offers a unique laboratory for gas-phase ion disk chemistry. We won ALMA program to observe the reaction of molecular line emission to ionizing radiation across one binary orbit. Complementary to the approved NuSTAR/Swift observations near periastron, we request Chandra snapshots away from periastron to measure X-ray fluxes as inputs to a time-resolved physical-chemical disk model. The model and ALMA data will provide unique estimates of disk density distribution that have far-reaching implications for understanding evolution of disks and formation of planets.

Remarks:
Per science justification, we request 12 Chandra ACIS-I3 1.5-ksec snapshots, separated by roughly 1 day, to cover the Phi=[1.2-1.9] phase of DQ Tau, that is the 11-day span starting approximately on August 02, 2022, 00:00:00 UT.

psci Run:
68
 Processing Date:
Aug 14 2022
 psci Directory:
/nfs/maaxnew/r3/fg/acis121a/acis121.log
OBSID:
26474
 SIM Mode:
ACIS-I
 OTG Mode:
NONE
 Seq Number:
201553
 Target Name:
DQ_Tau
 AO:
23
Start VCDU:
30043:032
 Start Time (UTC):
223:20749.906
 Stop Time (UTC):
223:22368.136
 Kilosecs:
1.6
 % Frames:
100.0
 # CCDs:
I1
# Frames:
2991
 # Events:
1518
 Events/sec:
0
 PSCI errors:
0
 % drops:
0.0
 Bias Errs:
1
 FP Temp:
-115.7
Parameter Block:
0x00c10014
 Window Block:
-
 # Windows:
0
 FEP Mode:
Te5x5
 BEP Mode:
F
 Start Row:
896
 # Rows:
128
Primary Exposure:
5
 Secondary Exposure:
0
 Duty Cycle:
0
 Summing?:
No
 Bias?:
Yes
 Trickle?:
Yes
 Bias Run:
68

pgf@space.mit.edu Mon Mar 31 10:36:39 EST 2025