Scientific Category is a required field. Science Keywords: Select from 2 to 5 items. US Admin CoI is a required field. Unsupported characters were found in Name and replaced with |*| Only letters, numerals, '.', '+' and '-' are allowed in target names. Blank spaces are not allowed. Target names are limited to 2 to 31 characters. Only letters, numerals, '.', '+' and '-' are allowed in target names. Blank spaces are not allowed. Target names are limited to 2 to 31 characters. Only letters, numerals, '.', '+' and '-' are allowed in target names. Blank spaces are not allowed. Target names are limited to 2 to 31 characters. Wavelength is a required field. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Wavelength is a required field. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Wavelength is a required field. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. 0 Assigned ID: 1312 ----- Attempting Submission 1 (Tue Dec 29 14:43:05 GMT 2020) ----- joint Auto-adjusted exposure durations 1237500794 ----- Attempting Submission 1 (Thu Feb 04 22:11:41 GMT 2021) ----- ----- Attempting Submission 2 (Mon May 17 17:51:15 GMT 2021) ----- ----- Attempting Submission 3 (Wed Jun 02 14:42:25 GMT 2021) ----- Testing the apparent steep decline in the chromospheric emission of very late M dwarfs We recently published evidence for a steep decline in chromospheric ultraviolet emission compared with coronal X-ray emission for mid-to-late M dwarfs. Very late M dwarfs appear to be underluminous in the ultraviolet by two orders of magnitude. If confirmed, this chromospheric decline will have profound implications for the habitability of exoplanet systems similar to TRAPPIST-1. The chromospheric decline may also point to a change in stellar dynamo mechanism at the fully convective boundary. We propose XMM-Newton and HST observations of three very late M dwarfs in order to test that the chromospheric decline is a common feature of the class. We will observe the Lyman alpha emission from our three late M dwarf targets with STIS G140M 1222 CENWAVE. We will use the 0.2" D1 slit to minimize airglow and dark current while maximizing S/N and absolute flux calibration. The only detectable stellar emission expected with this grating setup is Lyman alpha and possibly N V and Si III, so those lines are all that has been included in our science ETCs. We would like our wavecal exposures to occur during eclipse to maximize on-target exposures for these faint stars. Our science case requires each HST visit be executed as close in time as possible with the corresponding XMM-Newton visit. Simultaneous observations are ideal, and within approximately 1 week of each other is acceptable. We have included here the XMM visibility windows for our three targets to aid in planning: (1) 2MASS J02530084+1652532 (Teegarden's star) Radial velocity = +63 km/s (Newton+14) 2021 Feb 4 to Feb 23 2021 July 19 to Aug 26 2022 Jan 17 to Feb 23 2022 July 24 to Aug 28 (2) 2MASSJ15345704-1418486 Radial velocity = -71 km/s (Burgasser+15) 2021 Feb 6 to March 3 2021 July 28 to Sept 6 2022 Jan 29 to March 4 2022 July 29 to Sept 6 (3) 2MASSJ03341218 (LEHPM 3396) Radial velocity = +71 km/s (Reiners+09) 2021 Feb 4 to March 7 2021 May 24 to Sept 9 2021 Nov 26 to 2022 March 7 2022 May 24 to Sept 9 We have not imposed time constraints on the visits to further minimize airglow to aid in schedulability. If the scheduling constraints are not too onerous, we would prefer these dates because it would place the airglow emission in the expected ISM attenuation region. This will improve our determinations of the Lyman alpha fluxes of our target stars, and is typically standard for Lyman alpha stellar observations. The preferred date ranges are: (1) 2MASS J02530084+1652532 (Teegarden's star) Radial velocity = +63 km/s (Newton+14) March 22 to Sep 23 (any year) (2) 2MASSJ15345704-1418486 Radial velocity = -71 km/s (Burgasser+15) October 13 to Feb 25 (any year) (3) 2MASSJ03341218 (LEHPM 3396) Radial velocity = +71 km/s (Reiners+09) March 17 to Sep 28 n/a 6 false false false false false false false SUPPORTED STAR M V-IV NO TEEGARDEN-STAR J2000 J2000 STAR M V-IV NO J2000 J2000 STAR M V-IV NO J2000 J2000 STIS/FUV-MAMA Spectroscopic No No G140M STIS/FUV-MAMA Spectroscopic No No G140M STIS/FUV-MAMA Spectroscopic No No G140M The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. 1628000732000 253.1821342982849 (Tic-Visit :proposal-id 16487 :visit-id "01" :proposal-version -1 :trans-version "20200619" :date "02-Jun-2021 08:40:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 226560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16487 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16487 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2763 :al-overhead-at-end 0 :internal-dur-at-end 622 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3156 :pcs-gap 0 ) true 1 0 Our science case requires coordinating with the XMM-Newton observations. See observing description. The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. 1627752257000 82.0 (Tic-Visit :proposal-id 16487 :visit-id "02" :proposal-version -1 :trans-version "20200619" :date "02-Jun-2021 08:40:37.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 226560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16487 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16487 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2756 :al-overhead-at-end 0 :internal-dur-at-end 622 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3149 :pcs-gap 0 ) true 1 0 Our science case requires coordinating with the XMM-Newton observations. See observing description. The scheduling data was generated by CASM 29.0. CASM was run in Phase II mode. 1639190935000 9.248213560154511 (Tic-Visit :proposal-id 16487 :visit-id "03" :proposal-version -1 :trans-version "20200619" :date "02-Jun-2021 08:40:40.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 226560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16487 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16487 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2892 :al-overhead-at-end 0 :internal-dur-at-end 622 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 Our science case requires coordinating with the XMM-Newton observations. See observing description. (Tic-Visit :proposal-id 16487 :visit-id "03" :proposal-version -1 :trans-version "20200619" :date "02-Jun-2021 08:40:40.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 226560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16487 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16487 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2892 :al-overhead-at-end 0 :internal-dur-at-end 622 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) false 1 0 Our science case requires coordinating with the XMM-Newton observations. See observing description.