Special Call
Pathfinder Science for a Chandra Successor Mission
Accepted Proposals


Proposal NumberSubject CategoryPI NameChandra TimeTitle
19208608STARS AND WDThomas Ayres80.00ksBeyond the Coronal Graveyard
19508623SN, SNR AND ISOLATED NSDan Patnaude166.00ksZeroing in on the Mass Loss Properties of Core Collapse Supernova Progenitors
19708616ACTIVE GALAXIES AND QUASARSElena Gallo199.80ksLow Surface Brightness Galaxies and the Black Hole Occupation Fraction


Proposal NumberSequence NumberObsIDInstrumentGratingApproved Exposure TimeActual Exposure TimeTargetStatus Start Time [UT]PI Name
1920860820120620996HRC-INONE50.00000050.055878ALPHA BOOobservedJun 9 2018 10:06AMAyres
1920860820120621102HRC-INONE30.00000030.146533ALPHA BOOobservedJun 10 2018 7:57PMAyres
1950862350304320997ACIS-SNONE19.00000020.990564SN 2011jaobservedApr 24 2018 9:33PMPatnaude
1950862350304420998ACIS-SNONE20.00000020.091000SN2011dhobservedAug 31 2018 4:28PMPatnaude
1950862350304520999ACIS-SNONE15.00000015.089764SN2008axobservedNov 6 2018 2:46AMPatnaude
1950862350304621000ACIS-SNONE10.00000010.091748SN2013ejobservedSep 30 2018 8:35PMPatnaude
1950862350304721001ACIS-SNONE10.00000010.091451SN2012awarchivedMar 26 2018 4:54PMPatnaude
1950862350304821002ACIS-SNONE10.00000010.092000SN2013byobservedJun 19 2018 5:42AMPatnaude
1950862350304921003ACIS-SNONE22.00000022.092000SN2013akobservedAug 5 2018 8:04PMPatnaude
1950862350305021004ACIS-SNONE15.00000015.090000SN2003gkobservedAug 21 2018 2:14AMPatnaude
1950862350305121005ACIS-SNONE22.00000021.963000SN2013dfarchivedMar 26 2018 8:10PMPatnaude
1950862350304321082ACIS-SNONE23.00000023.091000SN 2011jaobservedDec 6 2018 1:03AMPatnaude
1970861670364721006ACIS-SNONE3.2000003.329400LSBC F570-04observedJun 10 2018 12:24AMGallo
1970861670364821007ACIS-SNONE3.2000003.253765CGCG 098-132observedJun 8 2018 11:49AMGallo
1970861670364921008ACIS-SNONE3.2000003.297175LSBC F574-08observedJun 25 2018 9:22PMGallo
1970861670365021009ACIS-SNONE3.6000003.651473LSBC F574-07observedMay 10 2018 2:20PMGallo
1970861670365121010ACIS-SNONE3.6000003.492606UGC 08839archivedApr 3 2018 5:04PMGallo
1970861670365321012ACIS-SNONE5.9000005.952000LSBC F574-09observedApr 14 2018 10:37AMGallo
1970861670365421013ACIS-SNONE6.1000006.150214UGC 05629observedJul 2 2018 8:59PMGallo
1970861670365521014ACIS-SNONE6.7000006.742500LSBC F570-06observedNov 25 2018 11:32AMGallo
1970861670365621015ACIS-SNONE7.1000006.990500UGC 06151archivedMar 21 2018 10:03AMGallo
1970861670365721016ACIS-SNONE7.4000007.449300IC 3605archivedApr 3 2018 2:35PMGallo
1970861670365821017ACIS-SNONE9.0000009.048900LSBC F750-04observedAug 26 2018 11:56PMGallo
1970861670366021019ACIS-SNONE6.5000006.553400LSBC F544-01observedNov 14 2018 3:44AMGallo
1970861670366121020ACIS-SNONE7.1000007.154491LSBC F612-01observedSep 24 2018 8:47PMGallo
1970861670366221021ACIS-SNONE10.40000010.450100LSBC F743-01observedSep 2 2018 7:07AMGallo
1970861670366321022ACIS-SNONE12.60000012.654111LSBC F576-01observedAug 13 2018 11:20AMGallo
1970861670366521024ACIS-SNONE5.8000005.852800UGC 05005observedJun 19 2018 4:26PMGallo
1970861670366621025ACIS-SNONE5.8000005.691445UGC 1230observedNov 14 2018 5:50AMGallo
1970861670366721026ACIS-SNONE6.7000006.754900UGC 04669observedMay 23 2018 9:51PMGallo
1970861670366921028ACIS-SNONE7.4000007.650720UGC 09927observedMay 6 2018 2:56PMGallo
1970861670367021029ACIS-SNONE7.7000007.963900UGC 10017observedMay 17 2018 3:52AMGallo
1970861670367121030ACIS-SNONE7.8000007.852300UGC 10015observedMay 7 2018 9:09PMGallo
1970861670367221031ACIS-SNONE8.4000008.474345UGC 11578observedAug 5 2018 12:06PMGallo
1970861670367321032ACIS-SNONE9.6000009.653400LSBC F570-05observedJun 28 2018 8:36AMGallo
1970861670367421033ACIS-SNONE11.30000011.352200UGC 416observedSep 9 2018 3:35PMGallo
1970861670365221011ACIS-SNONE4.8000004.854437UGC 05675archivedMar 21 2018 8:26AMGallo
1970861670365921018ACIS-SNONE6.4000006.451100UGC 09024archivedApr 4 2018 3:50AMGallo
1970861670366421023ACIS-SNONE15.60000015.070960LSBC F583-04observedMay 24 2018 9:33PMGallo
1970861670366821027ACIS-SNONE6.9000006.792100UGC 05750archivedMar 21 2018 12:17PMGallo

Subject Category: STARS AND WD

Proposal Number: 19208608

Title: Beyond the Coronal Graveyard

PI Name: Thomas Ayres

Iconic Arcturus is member of a populous class of low-mass red giants whose warm winds are a life-blood of Galactic ecology. How their mass outflows are powered has remained elusive. A solar-like coronal wind seemed unlikely, because the red giants have a very low incidence of high-energy detections. In fact, Arcturus, itself, is one of the weakest X-ray sources known among the bright cool stars. An intriguing possibility is that red giants do have significant magnetic activity and coronae, but mostly hidden beneath their puffy chromospheres. Unfortunately, the X-ray spectra that could test the ”buried corona” conjecture are beyond reach of contemporary facilities. However, a new, robust X-ray detection of Arcturus would inform the next generation of high-energy observatories, whether such advanced measurements in fact would be feasible.

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 19508623

Title: Zeroing in on the Mass Loss Properties of Core Collapse Supernova Progenitors

PI Name: Dan Patnaude

The mass loss history of massive stars is one of the least understood yet fundamental aspects of stellar evolution. How and when do massive stars shed their hydrogen envelopes? Is there a relationship between the expulsion of the stellar envelope and core collapse? Is there a fundamental relationship between late time mass loss and supernova classification? These central, yet open questions motivate the proposed Chandra Successor Mission program. In regards to these questions, studying the evolution of a supernova shock, over timescales of decades, as it interacts with the ejected envelope of the progenitor, provides insight into how much mass was lost and perhaps most importantly, when it was lost, prior to core collapse. X-ray emission from the shocked gas probes the dynamics of the interaction, and when combined with multiwavelength observations, constrains properties of the surrounding circumstellar gas and thus the later stages of the progenitor’s evolution.

Subject Category: ACTIVE GALAXIES AND QUASARS

Proposal Number: 19708616

Title: Low Surface Brightness Galaxies and the Black Hole Occupation Fraction

PI Name: Elena Gallo

We propose a snapshot survey of nearby low-surface brightness galaxies (unbiased with respect to nuclear properties) to measure the rate and incidence of low Eddington ratio nuclear X-ray emission and determine how the nuclear L X to mass (stellar and/or gas) relation in this sample compares with that of normal, high surface brightness galaxies. Results from this program will inform the galaxy selection function needed towards a high accuracy black hole occupation fraction measurement with Lynx. In turn, this will constrain the primary mode for black hole seeding at high z, complementing efforts that will be undertaken at high-z.