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A dark energy camera search for missing supergiants in the LMC after the advanced LIGO gravitational-wave event GW150914

Journal Article · · The Astrophysical Journal. Letters (Online)
 [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). et al.
The collapse of a stellar core is expected to produce gravitational waves (GWs), neutrinos, and in most cases a luminous supernova. Sometimes, however, the optical event could be significantly less luminous than a supernova and a direct collapse to a black hole, where the star just disappears, is possible. The GW event GW150914 was detected by the LIGO Virgo Collaboration via a burst analysis that gave localization contours enclosing the Large Magellanic Cloud (LMC). Shortly thereafter, we used DECam to observe 102 deg2 of the localization area, including 38 deg2 on the LMC for a missing supergiant search. We construct a complete catalog of LMC luminous red supergiants, the best candidates to undergo invisible core collapse, and collected catalogs of other candidates: less luminous red supergiants, yellow supergiants, blue supergiants, luminous blue variable stars, and Wolf–Rayet stars. Of the objects in the imaging region, all are recovered in the images. The timescale for stellar disappearance is set by the free-fall time, which is a function of the stellar radius. Our observations at 4 and 13 days after the event result in a search sensitive to objects of up to about 200 solar radii. We conclude that it is unlikely that GW150914 was caused by the core collapse of a relatively compact supergiant in the LMC, consistent with the LIGO Collaboration analyses of the gravitational waveform as best interpreted as a high mass binary black hole merger. Lastly, we discuss how to generalize this search for future very nearby core-collapse candidates.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Arizona U.; Australia, CSIRO, North Ryde; Barcelona, IEEC; Barcelona, IFAE; Brookhaven National Laboratory (BNL), Upton, NY (United States); Caltech; Carnegie Inst. Observ.; Cerro-Tololo InterAmerican Obs.; Chicago U., KICP; Columbia U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Garching, Max Planck Inst., MPE; Harvard-Smithsonian Ctr. Astrophys.; ICREA, Barcelona; Illinois U., Urbana; Illinois U., Urbana, Astron. Dept.; Johns Hopkins U.; LIneA, Rio de Janeiro; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Madrid, CIEMAT; Maryland U.; Michigan U.; Munich U.; Munich, Tech. U., Universe; NASA, Goddard; Ohio State U.; Ohio State U., CCAPP; Ohio State U., Dept. Astron.; Ohio U.; Paris, Inst. Astrophys.; Penn State U.; Pennsylvania U.; Portsmouth U., ICG; Rhodes U.; Rio Grande do Sul U.; Rio de Janeiro Observ.; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Sao Paulo U.; Sao Paulo, IFT; Southampton U.; Stanford U., Phys. Dept.; Sussex U.; Texas A-M; U. Michigan, Dept. Astron.; UC, Berkeley; University Coll. London
Sponsoring Organization:
US Department of Energy; USDOE; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
The DES Collaboration
Grant/Contract Number:
AC02-05CH11231; AC02-07CH11359; AC52-06NA25396
OSTI ID:
1295214
Alternate ID(s):
OSTI ID: 1409758
OSTI ID: 22654193
OSTI ID: 1456940
OSTI ID: 1297824
Report Number(s):
BNL--112472-2016-JA; FERMILAB-PUB-16-032-AE-PPD; LA-UR--16-20940; KA2301020
Journal Information:
The Astrophysical Journal. Letters (Online), Journal Name: The Astrophysical Journal. Letters (Online) Journal Issue: 2 Vol. 823; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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