Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 4884 Report Date: 18-Jul-95:16:56 Version: ********** Check-in Date: ********** 1.Proposal Title: HIGH SPEED ASTROMETRY - A SEARCH FOR PLANETARY COMPANIONS TO LOW-MASS STARS PART FOUR: CYCLE3 HIGH ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID SOLAR SYSTEM GTO/AST 2 Long Term yrs Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr. William H. Jefferys UNIVERSITY OF TEXAS USA (512)471-3000 PROFESSOR ------------------------------------------------------------------------------------ 7. Abstract We propose to test the hypothesis that jupiter-like planets are formed at distances from the primary dictated by the 'freezing' temperature of the volatiles which comprise jovian planets. Predicted periods for jovian planets orbiting this sample of very late-type, low-mass stars range from 70 to 160 days. We shall monitor the positions of these nearby late-M stars with a time-resolution of 4 to 10 days in an attempt to detect positional perturbations caused by possible jovian companions. Detection limits for these proposed targets lie between 0.4 and one Jupiter mass. ------------------------------------------------------------------------------------ 8. Scientific Key Words: FINE GUIDANCE SENSORS, FGS, STELLAR COMPANIONS, EXTRASOLAR PLANETS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 35.00 par: 0 10. Num targs pri: 6 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FGS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 4884 PI: Dr. William H. Jefferys Proposal Title: HIGH SPEED ASTROMETRY - A SEARCH FOR PLANETARY COMPANIONS TO LOW-MASS STARS PART FOUR: CYCLE3 HIGH ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Dr. William H. Jefferys UNIVERSITY OF TEXAS USA Dr. George F. Benedict UNIVERSITY OF TEXAS USA Dr. Raynor L. Duncombe UNIVERSITY OF TEXAS USA Dr. Paul D. Hemenway UNIVERSITY OF TEXAS USA Dr. Peter S. Shelus UNIVERSITY OF TEXAS USA Dr. Otto G. Franz LOWELL OBSERVATORY USA Dr. Laurence W. Fredrick UNIVERSITY OF VIRGINIA USA Dr. William F. Van Altena YALE UNIVERSITY USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. Acquire guide stars in the FGS units selected for guiding. Measure target, then reference stars, then target. Observations will be spaced 4 to 10 days over a time span of 100 to 250 days, depending on the target. Use FGS unit designated as Astrometry Prime. Cycle 0 = Exposures 13, 23 Cycle 1 = Exposures 13, 23, 33 ,45, 53, 63 Cycle 2 = Exposures 63 ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The minimum detectable mass depends directly on the accuracy of the positional measurements. Ground-based accuracies rarely exceed 50 milliarcseconds (mas). The assumed 2 mas accuracy of HST should let us detect 25 times less massive companions than from the ground. ------------------------------------------------------------------------------------ 13. "High-Speed" Astrometry will be carried out on 6-8 low-mass stars in an effort to detect positional perturbations due to jovian planets. We assume that such planets will lie close to these low luminosity stars, and, hence, have fairly short orbital periods. Observations will be spaced 4 to 8 days apart. ------------------------------------------------------------------------------------ 11. Address Information Name: JEFFERYS Category: PI Institution: Address: City: State: Zip Code: Country: Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ Name: GEORGE F. BENEDICT Category: CON Institution: Address: DEPARTMENT OF ASTRONOMY City: AUSTIN State: TX Zip Code: 78712 Country: USA Telephone: (512)471-3448 Telex (or e-mail): ------------------------------------------------------------------------------------ Page 3 Name: WILLIAM H. JEFFERYS Category: PI Institution: UNIVERSITY OF TEXAS Address: DEPARTMENT OF ASTRONOMY City: AUSTIN State: TX Zip Code: 78712 Country: USA Telephone: (512)471-1455 Telex (or e-mail): TEXASTRO ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 4884 [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 29 BARNARDS- A,139 RA = 17H 55M 20.94S +/- 2", 1950.0 1 V = 9.54 +/- 0.02 STAR DEC = +4D 39' 21.40" +/- 2" Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) B 1985.50 -0.0500 +/- 0.0007 10.3100 +/- 0.0100 0.5520 +/- 0.0050 ------------------------------------------------------------------------------------------------------------------------------------ 30 BARNARD-GSC- J,701 RA = 269.47687D +/- 0.0003D, 2000.0 1 V = 13.26 +/- 0.6 1-REF DEC = +4.680570D +/- 0.0003D ------------------------------------------------------------------------------------------------------------------------------------ 31 BARNARD-75- J,701 RA = 269.436264D +/- 2000.0 1 V = 16.84 +/- 0.6 REF 0.0003D, DEC = +4.690059D +/- 0.0003D ------------------------------------------------------------------------------------------------------------------------------------ 32 BARNARD-81- J,701 RA = 269.437087D +/- 2000.0 1 V = 15.5 +/- 0.6 REF 0.0003D, DEC = +4.679343D +/- 0.0003D ------------------------------------------------------------------------------------------------------------------------------------ 33 BARNARD-90- J,701 RA = 269.42924D +/- 0.0003D, 2000.0 1 V = 15.5 +/- 0.6 REF DEC = +4.666314D +/- 0.0003D ------------------------------------------------------------------------------------------------------------------------------------ 34 BARNARD-GSC- J,701 RA = 269.456590D +/- 2000.0 1 V = 14.52 +/- 0.6 2-REF 0.0003D, DEC = +4.706910D +/- 0.0003D ------------------------------------------------------------------------------------------------------------------------------------ 35 BARNARD-GSC- J,701 RA = 269.466480D +/- 2000.0 1 V = 11.18 +/- 0.6 3-REF 0.0003D, DEC = +4.705630D +/- 0.0003D ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4884 [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 20 DEFINE BARNARDS- FGS POS PRIME F583W DATA-RATE=32 1 10S 10 1 1 SEQ 20-26 NON-INT SEQ21 STAR Comments: AVOID TERMINATOR CROSSING ------------------------------------------------------------------------------------------------------------------------------------ 20.5 DEFINE BARNARD-GSC ^ ^ ^ ^ ^ ^ 52S ^ ^ SEQ21 -1-REF ------------------------------------------------------------------------------------------------------------------------------------ 21 DEFINE BARNARD-75- ^ ^ ^ ^ ^ ^ ^ ^ ^ DO FOR TARG 31-33 SEQ21 REF Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE ASTROMETRY PICKLE ------------------------------------------------------------------------------------------------------------------------------------ 22 DEFINE BARNARDS- ^ ^ ^ ^ ^ ^ 10S ^ ^ SEQ21 STAR ------------------------------------------------------------------------------------------------------------------------------------ 23 DEFINE BARNARD-GSC ^ ^ ^ ^ ^ ^ 52S ^ ^ SEQ21 -1-REF ------------------------------------------------------------------------------------------------------------------------------------ 24 DEFINE BARNARD-GSC ^ ^ ^ ^ ^ ^ ^ ^ ^ DO FOR TARG 34-35 SEQ21 -2-REF Comments: OBSERVE ONLY THOSE REFERENCE STARS WITHIN THE ASTROMETRY PICKLE ------------------------------------------------------------------------------------------------------------------------------------ 25 DEFINE BARNARD-GSC ^ ^ ^ ^ ^ ^ ^ ^ ^ SEQ21 -1-REF ------------------------------------------------------------------------------------------------------------------------------------ 26 DEFINE BARNARDS- ^ ^ ^ ^ ^ ^ 10S ^ ^ SEQ21 STAR ------------------------------------------------------------------------------------------------------------------------------------ 27 USE AT 24-MAR-94 +/- SEQ21 4D REPEAT 27 EVERY 16D +/- 2D FOR 16 MORE TIMES Comments: BREAK IN SERIES AVOIDS HST SUN CYCLE 4 CONSTRAINTS ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 4884 [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ^ ------------------------------------------------------------------------------------------------------------------------------------ Opmodes POS ^ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters DATA-RATE=32 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/AST ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 35.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category SOLAR SYSTEM ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SEQ 20-26 NON-INT; DO FOR TARG 31-33; DO FOR TARG 34-35; AT 24-MAR-94 +/- 4D; REPEAT 27 EVERY 16D +/- 2D FOR 16 MORE TIMES; CYCLE 4; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F583W ^ ------------------------------------------------------------------------------------------------------------------------------------ Target Names BARNARDS-STAR BARNARD-GSC-1-REF BARNARD-75-REF BARNARD-81-REF BARNARD-90-REF BARNARD-GSC-2-REF BARNARD-GSC-3-REF ------------------------------------------------------------------------------------------------------------------------------------