0 Assigned ID: 629 ----- Attempting Submission 1 (Fri Apr 11 17:52:36 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 2 (Fri Apr 11 22:11:39 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 3 (Fri Apr 11 22:14:23 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 4 (Fri Apr 11 22:16:13 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 5 (Fri Apr 11 22:17:06 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 6 (Fri Apr 11 22:18:19 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 7 (Fri Apr 11 22:21:30 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 8 (Fri Apr 11 22:23:03 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 9 (Fri Apr 11 22:27:34 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 10 (Fri Apr 11 22:28:49 GMT 2014) ----- HST Phase I Proposal 629 (stm_grism.apt) successfully submitted. ----- Attempting Submission 11 (Fri Apr 11 23:45:36 GMT 2014) ----- 0 ----- Attempting Submission 1 (Fri Jul 18 14:30:47 GMT 2014) ----- HST Phase II Proposal 13763 (HST_13763_PhII_megeath_v4.apt) successfully submitted. ----- Attempting Submission 2 (Mon Sep 08 17:18:29 GMT 2014) ----- WFC3 Spectroscopy of Faint Young Companions to Orion Young Stellar Objects We propose G141 grism spectroscopy of faint young companions to young stellar objects (YSOs) in the Orion molecular cloud which were recently identified in a WFC3/HST 1.6 micron survey of 320 YSOs in Orion. We will target the ten faintest companions detected between 80-1000 AU which have F160W magnitudes between 19 and 22.6 mag; these are too faint to obtain spectra from ground-based telecopes. The faint magnitudes of these ten companions suggest that they have masses as small as 5 Mjupiter depending on their age and reddening. To determine spectral types and masses for these sources, we will use grism spectroscopy to detect broad water features in the photospheric spectrum. These observations are part of a coordinated spectroscopy campaign; the remaining 50 brighter companions will be observed using spectrographs on the IRTF and SUBARU. These data will constrain the companion mass function at projected separations of 80-1000 AU from Orion young stellar objects. Given their faint magnitudes, as many as half of the 60 companions may be below the Hydrogen burning limit. With spectra, we can determine whether there is an excess of sub-stellar companions relative to the field IMF at these separations; the detection of such an excess would be evidence for the formation of sub-stellar objects in the outer regions of protostellar disks. Furthermore, the observed fraction of companions at these separations increases from 7.8 to 14.1% between low and high stellar density region in Orion; suggesting that the formation of multiple sytems is dependent on the birth environment. With spectra, we can explore the dependence of the companion mass function on the birth environment. We will use grism observations to obtain 1.075 to 1.7 micron spectra of our targeted source. The anticipated spectral resolution of the GRISM for a point source, lambda/delta_lambda ~ 130, is sufficient to detect the broad water features and overall spectrum shape needed to determined spectral types and extinction (Figure 3). The companions we have chosen are at separations of 1", 1.4", 2.3", 1.8", 0.8", 0.22", 1.06", 1", 2" and 0.74", for HOPS 68b, HOPS92b, HOPS140B, HOPS268B, HOPS177B, HOP15B, HOPS71B, FM727B, HOPS5B and HOPS18B, respectively. The primary reason for using WFC3 to obtain these spectra is their faintness in the H-band, 19 to 22.6 mag, spectra of such objects with S/N sufficient for spectral typing are very difficult to obtain from the ground even with an 8 meter telescope. We note that shorter (< 1 micron) wavelength observations are typically not feasible due to the high extinction, while longer (> 2 micron) wavelength observations will be strongly contaminated by emission from hot dust in a protostellar disk and envelope. Furthermore, this wavelength range shows strong spectral features that are sensitive to effective temperature and surface gravity (Peterson et al. 2008). For these reasons, the G140 wavelength range is optimal for this program. Since these companions have nearby primary stars, the roll angles have been constrained to ensure that the spectra are well separated. Fortunately, since Orion is near the equator, a wide range of roll angles can be accomodated on a larger number of days. To avoid ensure that the primary and companion do not overlap, and to avoid other stars and nebulosity in the field, we have chosen very strict angle requirements. We have estimated the S/N that can be obtained in a single orbit, taking into account acquisition time, and the time to obtain a direct image the source. After acquiring the object, we will take two dithered spectra each with its own direct image in the F160W band. In a 50 minute orbit, with 6 minutes of acquisition time and about ~ 5 minutes of overhead, we will obtain two 5 minute direct images, leaving time for two 1200 second exposures in a single orbit (for example with STEP200, nsamp = 13). This would provide a signal to noise at 1.6 micron ranging from 40 for the faintest targets to 300 for the brightest targets. We note that the sources are very red and will have a lower S/N at 1 micron. In addition, high signal to noise across the spectrum will provide the best constraints on spectral type and extinction. Furthermore, acquiring two sources in a single orbit would require large overheads per orbit for acquisition and direct images. For this reason, we ask for one orbit per source independent of the magnitude. RESOLVED STAR FORMATION Default false false false false false SUPPORTED STAR YSO J2000 J2000 F160W 20.23 mag STAR YSO J2000 J2000 F160W 19.61 mag STAR YSO J2000 J2000 F160W 20.69 mag STAR YSO J2000 J2000 F160W 19.24 mag STAR YSO J2000 J2000 F160W 20.03 mag STAR YSO J2000 J2000 F160W 18.99 mag STAR YSO J2000 J2000 F160W 20.46 mag STAR YSO J2000 J2000 F160W 19.5 mag STAR YSO J2000 J2000 F160W 22.5 mag STAR YSO J2000 J2000 F160W 22.7 mag WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 WFC3/IR Spectroscopic No No G141 POS-TARG DITHER 1.0759 This is a ~5" jump that will be used to dither inbetween sources with either ~2" separation or 0.5" separation LINE false false 2 65 LINE 1 false POS-TARG DITHER 1.5675 This is a ~1.5" jump that will be used to dither inbetween sources with aorund ~1" separation LINE false false 2 73.13 LINE 2 false POS-TARG DITHER 2.066 This is a ~2" jump that will be used to dither inbetween sources with aorund ~1.5" separation LINE false false 2 77.28 LINE 3 false POS-TARG DITHER 2.5755 This is a ~2.5" jump that will be used to dither inbetween sources with aorund ~2" separation LINE false false 2 79.8245 LINE 4 false POS-TARG DITHER 3.604 This is for HOPS 71 LINE false false 2 82.75 LINE 5 false The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:17:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 870432 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2859 :al-overhead-at-end 0 :internal-dur-at-end 614 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:16:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2810 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "03" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:15:41.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "04" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:15:26.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2809 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "05" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:14:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2811 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "06" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:13:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 765984 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2710 :al-overhead-at-end 0 :internal-dur-at-end 557 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "07" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:12:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2813 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "08" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:11:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2810 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "09" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:11:04.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13763 :visit-id "10" :proposal-version -1 :trans-version "20140605" :date "08-Sep-2014 13:05:49.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 835616 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13763 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13763 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2809 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 0