|Cold dust in the ejecta of SN 1987A
|The discovery of z&amp;gt;6 galaxies containing very large quantities of dust leaves little room for dust enrichment by low and intermediate mass stars. A potential alternative source is dust formation in the ejecta of core collapse supernovae, where 0.1 to 1 Msun of dust could form according to theoretical scenarios. Studies at mid-infrared wavelengths of type II core-collapse supernovae in nearby galaxies have to date not confirmed these predictions. Recently, we have detected a source coincident with SN 1987A with PACS and SPIRE at 100, 160, 250 and 350 m as part of the HERITAGE key program. Fits to the spectral energy distribution yield a dust mass of 0.5 to 1 Msun, within the limits set by the predicted abundances for heavy elements in the ejecta. We propose detailed follow-up scan-map observations of a 10x10 arcmin field round SN 1987A. These observations will yield higher angular resolution and higher S-N detections of SN 1987A at wavelengths between 70 and 500 m, which will enable us to make the most accurate SED and ejecta dust mass achievable with Herschel. In particular, these observations will yield the 500 m flux density (for which we only have an upper limit from the HERITAGE observations) and a crucial 70 m flux density, which will help to bridge the spectral gap between the mid-infrared peak from the shocked ring around SN 1987A and the far-infrared emission peak from the cold ejecta dust. Finally, comparison between the HERITAGE observations and the proposed follow-up observations at 100, 160 and 250 m will enable us to detect any evolution in the flux densities from the remnant over a two-year time span. Such repeat observations are necessary to determine whether embedded radioactivity or the ambient interstellar radiation field is the dominant heating source of the dust.
|High Angular Resolution ALMA Images of Dust and Molecules in the SN 1987A Ejecta . Cigan Phil et al. . The Astrophysical Journal . null . null . 2019ApJ...886...51C ,
SOFIA mid-infrared observations of Supernova 1987A in 2016 - forward shocks and possible dust re-formation in the post-shocked region . Matsuura Mikako et al. . Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 2, p.1715-1723 . 482 . 10.1093/mnras/sty2734 . 2019MNRAS.482.1715M ,
A Stubbornly Large Mass of Cold Dust in the Ejecta of Supernova 1987A . Matsuura M. et al. . The Astrophysical Journal, Volume 800, Issue 1, article id. 50, 8 pp. (2015). . 800 . 10.1088/0004-637X/800/1/50 . 2015ApJ...800...50M ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2012, GT2_mbaes_3, SPG v14.2.0. https://doi.org/10.5270/esa-kb58adv