A dataset provided by the European Space Agency

Name HAE2BPIC
Title THE BETA PICTORIS PHENOMENON IN YOUNG STARS WITH ACCRETING GAS
URL

http://nida.esac.esa.int/nida-sl-tap/data?RETRIEVAL_TYPE=OBSERVATION&PRODUCT_LEVEL=ALL&obsno=176003050

DOI https://doi.org/10.5270/esa-jk2ce9z
Author GRADY, CAROL A.
Description since its discovery by iras, the uniqueness and evolutionary state of the beta pictoris disk have been topics of lively discussion. while detailed studies of beta pic have revealed the presence of a cleared inner region, with implications for planet formation, and the presence of accreting gas tentatively associated with comet-like bodies, observations of other systems, particularly younger ones, are needed to obtain a better understanding of the evolutionary history of the beta pic system. during the past 2 years we have identified a number of pms herbig ae/be stars which are viewed through a significant portion of their circumstellar dust disks, and which exhibit accreting gas similar to, but higher in accretion rate than beta pic. the available data suggest a correlation between the signatures of mass accretion, the prominence of optical indicators of dust in close proximity to the star, mass return to the ism, and the shape of the ir spectral energy distribution. the spectroscopy suggests that signatures of accreting volatile gases disappear prior to the refractory species. the optical/uv data give no information on volatile molecules or ices, and thus do not sample the species which are most characteristic of a proto-planetary disk in its earliest evolutionary phases. the time scale for volatile depletion is a critical parameter in planetary formation models, and constrains the mass of any gas giant which can be formed in a planetary system. the mid-ir spectrum, as sampled by the iso sws, is rich in bands from volatile molecules which are expected to be abundant in proto-planetary disks, pah features, sampling small organic grains, silicate bands sampling the refractory grains which are expected to be most important close to the stars, and ice features. acquisition of a homogeneous sample of low resolution spectra for a group of herbig ae/be stars chosen to span a range in age and ...degree of central clearing, together with a range in spectral type will permit us to constrain the time available for gas giant formation, and hence the expected planetary masses, more stringently than current estimates which are based on the disappearance of the dust disk.
Instrument SWS01
Temporal Coverage 1996-05-10T23:54:57Z/1997-01-16T22:02:14Z
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, GRADY, CAROL A., 1999, HAE2BPIC, 1.0, European Space Agency, https://doi.org/10.5270/esa-jk2ce9z