A dataset provided by the European Space Agency

Name APERTURE
Title EXTENDED INFRARED EMISSION AROUND YOUNG STARS
URL

http://nida.esac.esa.int/nida-sl-tap/data?RETRIEVAL_TYPE=OBSERVATION&PRODUCT_LEVEL=ALL&obsno=523014330

DOI https://doi.org/10.5270/esa-47le1mr
Author PRUSTI, TIMO
Description circumstellar environment of young stars is of special interest because it represents the initial conditions before planet formation. modeling the spectral energy distribution of young stars has led to the scenario of (accretion) disks around pre-main-sequence stars. however, there is a discrepancy in energetics. for some intermediate-mass stars the implied accretion rates are far too high. one possibility is excess mid-infrared luminosity due to non-equilibrium grains. we have recently detected the predicted extended emission due to non-equilibrium grains in three herbig ae/be stars. from the ground only a few suitable cases can be studied despite the potentially significant luminosity contribution in many young stars. the problem is the low surface brightness extended over a large area. with the dedicated multi aperture observing mode (isophot aot4) it is possible to measure the luminosity contribution of non-equilibrium grains to typical young stars. it is essential to understand the energy balance of a star and its circumstellar environment system before any model fitting procedure can be applied. iso can provide us this crucial information.
Instrument PHT04
Temporal Coverage 1996-11-14T15:27:32Z/1997-11-04T06:11:54Z
Version 1.0
Mission Description The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
Creator Contact https://support.cosmos.esa.int/iso/
Date Published 1999-04-08T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, PRUSTI, TIMO, 1999, APERTURE, 1.0, European Space Agency, https://doi.org/10.5270/esa-47le1mr