| Name | OT2_tharriso_5 |
| Title | Ascertaining the Origins and Evolution of the Mid/Far-Infrared Luminosities of Classical Novae |
| URL | http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342271012&instrument_name=SPIRE&product_level=LEVEL0&compress=true |
| DOI | https://doi.org/10.5270/esa-4hwag5l |
| Author | harrison, t. |
| Description | Classical novae (CNe) are cataclysmic variables that undergo thermonuclearrunaways every ~ 10,000 yr. During these events, they have luminosities thatcan exceed the Eddington luminosity for a solar mass object. This enormousluminosity drives an expanding fireball outwards at high velocity. As thedense gas clumps in this fireball cool, dust can form. About one third of all CNeform dust. Thus, it may not be surprising to find that many dusty CNewere detected by IRAS. But analysis of those detections showed that if the dustshells of those CNe had expanded freely, they would have been much too cold andfaint to have been detected by IRAS given the luminosities of the post-outburstsystems that are their illuminating sources. What then, is the explanation for the highIRAS detection rate of CNe? Perhaps the expanding dust shells interact with materialin a pre-existing circumstellar shell surrounding these objects, and are heated throughkinetic processes. Alternatively, maybe the IRAS detections were due to line emissionfrom highly overabundant species in their gaseous ejecta. It is hard, however, toionize this material given the observed quiescent luminosities of CNe. Since the timeof IRAS, two other mechanisms have been employed to explain the mid/far-IRexcesses of cataclysmic variables: circumbinary disks, and synchrotron emission.Either of these two sources appear to be more viable explanations for the IRASdetections of CNe. We propose to use Herschel PACs to obtain 70 and 160micron 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. |
| Publication | |
| 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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities. |
| Creator Contact | https://support.cosmos.esa.int/h®erschel/ |
| Date Published | 2013-10-27T16:37:18Z |
| Last Update | 2025-01-24 |
| Keywords | Herschel, HSC, submillimetre, far-infrared, HIFI, PACS, SPIRE |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, harrison et al., 2013, 'Ascertaining the Origins and Evolution of the Mid/Far-Infrared Luminosities of Classical Novae', SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-4hwag5l |