A dataset provided by the European Space Agency

Name OT2_tharriso_5
Title Ascertaining the Origins and Evolution of the Mid-Far-Infrared Luminosities of Classical Novae


DOI 10.5270/esa-4hwag5l
Author harrison, t.
Description Classical novae (CNe) are cataclysmic variables that undergo thermonuclear runaways every ~ 10,000 yr. During these events, they have luminosities that can exceed the Eddington luminosity for a solar mass object. This enormous luminosity drives an expanding fireball outwards at high velocity. As the dense gas clumps in this fireball cool, dust can form. About one third of all CNe form dust. Thus, it may not be surprising to find that many dusty CNe were detected by IRAS. But analysis of those detections showed that if the dust shells of those CNe had expanded freely, they would have been much too cold and faint to have been detected by IRAS given the luminosities of the post-outburst systems that are their illuminating sources. What then, is the explanation for the high IRAS detection rate of CNe? Perhaps the expanding dust shells interact with material in a pre-existing circumstellar shell surrounding these objects, and are heated through kinetic processes. Alternatively, maybe the IRAS detections were due to line emission from highly overabundant species in their gaseous ejecta. It is hard, however, to ionize this material given the observed quiescent luminosities of CNe. Since the time of IRAS, two other mechanisms have been employed to explain the mid-far-IR excesses of cataclysmic variables: circumbinary disks, and synchrotron emission. Either of these two sources appear to be more viable explanations for the IRAS detections of CNe. We propose to use Herschel PACs to obtain 70 and 160 micron photometry, and SPIRE to obtain 250, 350, and 500 micron photometry of seven dust-producing CNe spanning a wide rage of times since outburst to understand both the nature of their mid-far-IR emission, and how this emission evolves with time. Our program requires 5.9 hr.
Instrument PACS_PacsPhoto_largeScan
Temporal Coverage 2013-04-27T16:22:45Z/2013-04-27T16:50:48Z
Version SPG v14.2.0
Mission Description 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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-10-27T16:37:18Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-10-27T16:37:18Z, OT2_tharriso_5, SPG v14.2.0. https://doi.org/10.5270/esa-4hwag5l