Publication: Multiring images of thin accretion disk of a regular naked compact object.
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2022-08-30
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Amer Physical Soc
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Abstract
We discuss the importance of multiring images in the optical appearance of a horizonless spherically symmetric compact object, when illuminated by an optically thin accretion disk. Such an object corresponds to a subcase of an analytically tractable extension of the Kerr solution dubbed as the "eye of the storm" by Simpson and Visser in [J. Cosmol. Astropart. Phys. 03 (2022) 011], which merits in removing curvature singularities via an asymptotically Minkowski core, while harboring both a critical curve and an infinite potential barrier at the center for null geodesics. This multiring structure is induced by light rays winding several times around the object, and whose luminosity is significantly boosted as compared to the Schwarzschild solution by the modified shape of the potential. Using three toy profiles for the emission of an infinitely thin disk, truncated at its inner edge (taking its maximum value there) and having different decays with the distance, we discuss the image created by up to eight rings superimposed on top of the direct emission of the disk as its edge is moved closer to the center of the object. Our results point to the existence of multiring images with a non-negligible luminosity in shadow observations when one allows for the existence of other compact objects in the cosmic zoo beyond the Schwarzschild solution. Such multiring images could be detectable within the future projects on very long baseline interferometry.
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© 2022 American Physical Society
M. G. is funded by the predoctoral Contract No. 2018-T1/TIC-10431. D. R.-G. is funded by the Atraccion de Talento Investigador program of the Comunidad de Madrid (Spain) No. 2018-T1/TIC-10431. D. S.-C. G. is funded by the University of Valladolid (Spain) , Ref. No. POSTDOC UVA20. This work is supported by the Spanish Grants No. FIS2017-84440-C2-1-P, No. PID2019-108485 GB-I00, No. PID2020-116567 GB-C21 and No. PID2020-117301GA-I00 funded by MCIN/AEI/10.13039/501100011033 (?ERDF A way of making Europe? and ?PGC Generaci?n de Conocimiento?) , the Project No. PROMETEO/2020/079 (Generalitat Valenciana) , the Project No. H2020-MSCA-RISE-2017, Grant No. FunFiCO-777740, the Project No. i-COOPB20462 (CSIC) , the FCT Projects No. PTDC/FIS-PAR/31938/2017 and No. PTDC/FIS-OUT/29048/2017, and the Edital 006/2018 PRONEX (FAPESQ-PB/CNPQ, Brazil, GrantNo. 0015/2019) . This article is based upon work from COST Action CA18108, supported by COST (European Cooperation in Science and Technology) . All images of this paper were obtained with our own codes implemented within Mathematica?.