11828( 3) - 11-Jun-2009 09:47:08 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11828 Version: 3 Check-in Time: 11-Jun-2009 09:47:08 STScI Edit Number: 0 Title X-ray and FUV Photo-Ionization/-Excitation of Transitional Disks Around thePMS Stars HD135344B and Lk Halpha 330 ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Alexander Brown University of Colorado at Boulder CoI: Dr. Joanna M. Brown Max-Planck-Institut fur extraterrestrische N Physik CoI: Dr. Gregory Herczeg Max-Planck-Institut fur extraterrestrische N Physik CoI: Dr. Thomas R. Ayres University of Colorado at Boulder N ------------------------------------------------------------------------------------ Abstract Transitional disks have transformed most of the dust and gas in their inner regions into planetesimals or larger solid bodies. They are a rare, short-lived phase of PMS disk evolution and provide important physical insights and modeling constraints on disk and protoplanetary system evolution. We propose to observe two intermediate mass stars with transitional disks, HD135344B and Lk Halpha 330, using ACIS-S on Chandra and the COS FUV spectrograph on HST. We will use these spectra to determine the coronal, transition region, and upper chromospheric emission measure distribution, covering temperatures from 10, 000 K to 10 MK, and then calculate the full X-ray/EUV/FUV radiation field for use in modeling its photoexcitation/photoionization effects on the disk structure. ------------------------------------------------------------------------------------ Observations Description ------------------------ The F8 pre-main-sequence star HD135344B (SAO206462) is to be observed using COS G160M/G130M during the 3 orbits allocated . HD130095 is visually bright with V = 8.71 and has very accurate coordinates from the Hipparcos/Tycho Catalogue. Its proper motion is small; the coordinates given in this Phase II proposal are already corrected for proper motion to 2000.0. ORIENT restriction added 2009 June 10 ----- ORIENT from 200 deg to 80 deg. --- as requested by Contact Scientist. This restriction avoids the possibility of HD135344A falling within the PSA. Our observational sequence is: Acquisition consists of a 2X2 ACQ/SEARCH followed by an ACQ/IMAGE. Five segments of G160M spectra fill the rest of Orbit 1 and all of Orbit 2. Orbit 3 contains three G130M exposures. For our acquistion we use BOA+MIRRORA and 10 second exposures. Using V=7.81 to normalize an F8V model shows thsi to be a safe combination (see COS ETC output COS85813-COS85816. The COS Spectroscopy ETC indicates no problems for G160M or G130M. 11828( 3) - 11-Jun-2009 09:47:08 - [ 2] The scientific feasibility rationale in our proposal was: No moderate or high resolution UV spectra in the 1200-1800 A spectral region exist for HD135344B. An 8.5 ksec FUSE observation of HD135344B is very helpful because it shows the presence of O VI and C III transition region emission lines and the fluxes of these lines can be used to estimate the feasibility of COS observations. The stronger O VI doublet line (1032 A ) has an integrated flux of 1.2 10^{-13} ergs cm^{-2}/s. For normal transition region temperature structure and solar abundances the integrated flux of the equivalent C IV 1548 A line should be about 3 times larger. Thus we expect a flux of 3 10^{-13} ergs cm^{-2}/s in the stronger C IV line. The O VI lines have a FWHM of 1 A and we expect the C IV line widths also to have FWHM well over 0.5 A --- this spreads the flux over more of the COS detector and significantly reduces the line peak flux density compared to that of an unresolved line. We intend to measure the FUV spectrum of HD135344B using a set of G160M and G130M settings to provide full spectral coverage between 1175 and 1775 A at a velocity resolution of 15 km/s . These spectra will provide well-resolved emission line profiles and the opportunity to search for evidence of absorption by molecular gas close to the star. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11828( 3) - 11-Jun-2009 09:47:08 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD135344B STAR, F3-F9, PRE-MAIN RA=15H15M48.4390S +/- 0.1", J2000 V = 8.71 +/- 0.1 SEQUENCE STAR, DEC=-37D09'16.03" +/- 0.1" PROTOPLANETARY DISK Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 -0.0017 -0.026 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 11828( 3) - 11-Jun-2009 09:47:08 - [ 4] Visit: 01 Visit Requirements: ORIENT 200.0D TO 80.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD135344B COS/NUV ACQ/SEA BOA MIRRORA SCAN-SIZE=2 1 10 S RCH ------------------------------------------------------------------------------------------------------------------------------------ 2 HD135344B COS/NUV ACQ/IMA BOA MIRRORA 1 10 S GE ------------------------------------------------------------------------------------------------------------------------------------ 3 HD135344B COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=975 1 1085 S G ------------------------------------------------------------------------------------------------------------------------------------ 4 HD135344B COS/FUV TIME-TA PSA G160M 1589 BUFFER-TIME=975 1 1085 S G ------------------------------------------------------------------------------------------------------------------------------------ 5 HD135344B COS/FUV TIME-TA PSA G160M 1600 BUFFER-TIME=780 1 890 S G ------------------------------------------------------------------------------------------------------------------------------------ 6 HD135344B COS/FUV TIME-TA PSA G160M 1611 BUFFER-TIME=780 1 890 S G ------------------------------------------------------------------------------------------------------------------------------------ 7 HD135344B COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=775 1 885 S G ------------------------------------------------------------------------------------------------------------------------------------ 8 HD135344B COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=780 1 890 S G ------------------------------------------------------------------------------------------------------------------------------------ 9 HD135344B COS/FUV TIME-TA PSA G130M 1318 BUFFER-TIME=780 1 890 S G ------------------------------------------------------------------------------------------------------------------------------------ 10 HD135344B COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=775 1 885 S G ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD135344B 1 COS/NUV ACQ/SEA BOA MIRRORA none none none none 1 N/A RCH HD135344B 2 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE HD135344B 3 COS/FUV TIME-TA PSA G160M 1577 none none none none 1 N/A G 11828( 3) - 11-Jun-2009 09:47:08 - [ 5] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HD135344B 4 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G HD135344B 5 COS/FUV TIME-TA PSA G160M 1600 none none none none 2 N/A G HD135344B 6 COS/FUV TIME-TA PSA G160M 1611 none none none none 2 N/A G HD135344B 7 COS/FUV TIME-TA PSA G160M 1623 none none none none 2 N/A G HD135344B 8 COS/FUV TIME-TA PSA G130M 1309 none none none none 3 N/A G HD135344B 9 COS/FUV TIME-TA PSA G130M 1318 none none none none 3 N/A G HD135344B 10 COS/FUV TIME-TA PSA G130M 1327 none none none none 3 N/A G 11828( 3) - 11-Jun-2009 09:47:08 - [ 6] Summary Form for Proposal 11828 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BOA, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=775, BUFFER-TIME=780, BUFFER-TIME=975, SCAN-SIZE=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 200.0D TO 80.0 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD135344B ------------------------------------------------------------------------------------------------------------------------------------