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-INONE80.0 ALPHA BOOunobserved2018-06-06 00:00:00Ayres
1950862350304320997ACIS-SNONE42.0 SN 2011jaunobserved Patnaude
1950862350304420998ACIS-SNONE20.0 SN2011dhunobserved Patnaude
1950862350304520999ACIS-SNONE15.0 SN2008axunobserved Patnaude
1950862350304621000ACIS-SNONE10.0 SN2013ejunobserved Patnaude
1950862350304721001ACIS-SNONE10.0 SN2012awunobserved2018-03-27 00:00:00Patnaude
1950862350304821002ACIS-SNONE10.0 SN2013byunobserved Patnaude
1950862350304921003ACIS-SNONE22.0 SN2013akunobserved Patnaude
1950862350305021004ACIS-SNONE15.0 SN2003gkunobserved Patnaude
1950862350305121005ACIS-SNONE22.0 SN2013dfunobserved2018-03-29 00:00:00Patnaude
1970861670364721006ACIS-SNONE3.2 LSBC F570-04unobserved2018-03-27 00:00:00Gallo
1970861670364821007ACIS-SNONE3.2 CGCG 098-132unobserved2018-04-03 00:00:00Gallo
1970861670364921008ACIS-SNONE3.2 LSBC F574-08unobserved2018-04-08 00:00:00Gallo
1970861670365021009ACIS-SNONE3.6 LSBC F574-07unobserved2018-04-06 00:00:00Gallo
1970861670365121010ACIS-SNONE3.6 UGC 08839unobserved2018-04-03 00:00:00Gallo
1970861670365221011ACIS-SNONE4.8 UGC 05675unobserved2018-03-20 00:00:00Gallo
1970861670365321012ACIS-SNONE5.9 LSBC F574-09unobserved2018-04-11 00:00:00Gallo
1970861670365421013ACIS-SNONE6.1 UGC 05629unobserved Gallo
1970861670365521014ACIS-SNONE6.7 LSBC F570-06unobserved Gallo
1970861670365621015ACIS-SNONE7.1 UGC 06151unobserved2018-03-22 00:00:00Gallo
1970861670365721016ACIS-SNONE7.4 IC 3605unobserved2018-04-06 00:00:00Gallo
1970861670365821017ACIS-SNONE9.0 LSBC F750-04unobserved Gallo
1970861670365921018ACIS-SNONE6.0 UGC 09024unobserved2018-04-03 00:00:00Gallo
1970861670366021019ACIS-SNONE6.5 LSBC F544-01unobserved Gallo
1970861670366121020ACIS-SNONE7.1 LSBC F612-01unobserved Gallo
1970861670366221021ACIS-SNONE10.4 LSBC F743-01unobserved Gallo
1970861670366321022ACIS-SNONE12.6 LSBC F576-01unobserved2018-04-04 00:00:00Gallo
1970861670366421023ACIS-SNONE15.6 LSBC F583-04unobserved Gallo
1970861670366521024ACIS-SNONE5.8 UGC 05005unobserved Gallo
1970861670366621025ACIS-SNONE5.8 UGC 1230unobserved Gallo
1970861670366721026ACIS-SNONE6.7 UGC 04669unobserved Gallo
1970861670366821027ACIS-SNONE6.9 UGC 05750unobserved2018-03-22 00:00:00Gallo
1970861670366921028ACIS-SNONE7.4 UGC 09927unobserved Gallo
1970861670367021029ACIS-SNONE7.7 UGC 10017unobserved Gallo
1970861670367121030ACIS-SNONE7.8 UGC 10015unobserved Gallo
1970861670367221031ACIS-SNONE8.4 UGC 11578unobserved Gallo
1970861670367321032ACIS-SNONE9.6 LSBC F570-05unobserved2018-03-29 00:00:00Gallo
1970861670367421033ACIS-SNONE11.3 UGC 416unobserved Gallo


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.